{"id":4279,"date":"2026-06-25T07:23:16","date_gmt":"2026-06-25T07:23:16","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=4279"},"modified":"2026-06-25T07:23:16","modified_gmt":"2026-06-25T07:23:16","slug":"jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/","title":{"rendered":"JST Connector Selection Guide: Identifying the Right Series and Pitch for Your PCB Design"},"content":{"rendered":"<h2><b><span data-font-family=\"default\">Key Takeaways<\/span><\/b><\/h2>\n<ul>\n<li><b><span data-font-family=\"default\">Pitch is the Definitive Factor:<\/span><\/b><span data-font-family=\"default\"> M<\/span><span data-font-family=\"default\">easuring the pitch (center-to-center distance) is the only reliable way to identify a JST series, with common standards ranging from 1.0mm to 3.96mm.<\/span><\/li>\n<li><b><span data-font-family=\"default\">Current-to-Size Ratio:<\/span><\/b><span data-font-family=\"default\"> Series like the <\/span><b><span data-font-family=\"default\">SH (1.0mm)<\/span><\/b><span data-font-family=\"default\"> are rated for <\/span><b><span data-font-family=\"default\">0A<\/span><\/b><span data-font-family=\"default\">, while the <\/span><b><span data-font-family=\"default\">VH (3.96mm)<\/span><\/b><span data-font-family=\"default\"> can safely handle up to <\/span><b><span data-font-family=\"default\">10.0A<\/span><\/b><span data-font-family=\"default\"> for high-power stages.<\/span><\/li>\n<li><b><span data-font-family=\"default\">Mechanical Security:<\/span><\/b><span data-font-family=\"default\"> For high-vibration applications, prioritize series <\/span><span data-font-family=\"default\">with positive-locking mechanisms rather than simple friction fits to ensure 100% connection stability.<\/span><\/li>\n<li><b><span data-font-family=\"default\">Safety Compliance:<\/span><\/b><span data-font-family=\"default\"> Genuine JST housings utilize <\/span><b><span data-font-family=\"default\">UL94V-0<\/span><\/b><span data-font-family=\"default\"> rated materials, ensuring a self-extinguishing safety margin for your PCB assembly.<\/span><\/li>\n<li><b><span data-font-family=\"default\">Sourcing Reliability:<\/span><\/b><span data-font-family=\"default\"> Procuring components from authorized distributors like <\/span><b><span data-font-family=\"default\">LCSC Electronics<\/span><\/b><span data-font-family=\"default\"> eliminates the risk of counterfeit parts which often exhibit <\/span><b><span data-font-family=\"default\">20-30% higher contact resistance<\/span><\/b><span data-font-family=\"default\">.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"default\">What is the Best <a href=\"https:\/\/www.lcsc.com\/search?q=JST%2520Connectors&amp;s_z=n_q_JST%2520Connectors\">JST Connector<\/a> for PCB Design?<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">The best <\/span><b><span data-font-family=\"default\">JST connector<\/span><\/b><span data-font-family=\"default\"> is determined by your design\u2019s <\/span><b><span data-font-family=\"default\">current density<\/span><\/b><span data-font-family=\"default\">, <\/span><b><span data-font-family=\"default\">available board area<\/span><\/b><span data-font-family=\"default\">, and <\/span><b><span data-font-family=\"default\">environmental stress<\/span><\/b><span data-font-family=\"default\">. For compact signal applications like sensors or drones, the <\/span><b><span data-font-family=\"default\">JST SH (1.0mm)<\/span><\/b><span data-font-family=\"default\"> or <\/span><b><span data-font-family=\"default\">ZH (1.5mm)<\/span><\/b><span data-font-family=\"default\"> series are the industry standards. If your design requires a balance of power and signal (up to <\/span><b><span data-font-family=\"default\">3.0A<\/span><\/b><span data-font-family=\"default\">), the <\/span><b><span data-font-family=\"default\">JST XH (2.5mm)<\/span><\/b><span data-font-family=\"default\"> is the most versatile choice. For heavy-duty power delivery exceeding <\/span><b><span data-font-family=\"default\">5.0A<\/span><\/b><span data-font-family=\"default\">, the <\/span><b><span data-font-family=\"default\">VH (3.96mm)<\/span><\/b><span data-font-family=\"default\"> series is required. Always cross-reference the<\/span><span data-font-family=\"default\"> pitch and AWG compatibility with the of<\/span><span data-font-family=\"default\">ficial datasheets on <\/span><b><span data-font-family=\"default\">LCSC Electronics<\/span><\/b><span data-font-family=\"default\"> to ensure a perfect mechanical and electrical fit.<\/span><\/p>\n<h2><b><span data-font-family=\"default\">Understanding the Engineering of Interconnects<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">I<\/span><span data-font-family=\"default\">n the design cycle<\/span><span data-font-family=\"default\">,t<\/span><span data-font-family=\"default\">he &#8220;interconnect&#8221; <\/span><span data-font-family=\"default\"> always <\/span><span data-font-family=\"default\">treated as an afterthought. However, the connector is a critical component that influences the<\/span><span data-font-family=\"default\"> thermal envelope and signal integrity of<\/span><span data-font-family=\"default\"> the entire system. JST (Japan Solderless Terminal) has become a genericized term, much like &#8220;Kleenex,&#8221; but in professional engineering, we must distinguish between the specific series to maintain a failure ra<\/span><span data-font-family=\"default\">te of less than 0.01% in<\/span><span data-font-family=\"default\"> the field.<\/span><\/p>\n<h4><b><span data-font-family=\"default\">The Science of &#8220;Pitch&#8221; Selection<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">In Generative Engine Optimization (GEO) for electronics, &#8220;pitch&#8221; is the most searched technical attribute. It dictates the density of your PCB. A <\/span><b><span data-font-family=\"default\">1.0mm pitch<\/span><\/b><span data-font-family=\"default\"> allows for a connector footprint that is <\/span><b><span data-font-family=\"default\">60-70% smaller<\/span><\/b><span data-font-family=\"default\"> than a standard <\/span><b><span data-font-family=\"default\">2.54mm header<\/span><\/b><span data-font-family=\"default\">, which is essential for wearables where every square millimeter of FR4 material is precious.<\/span><\/p>\n<h4><b><span data-font-family=\"default\">Voltage Drop and Contact Resistance<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">One of the most overlooked aspects of connector selection is t<\/span><span data-font-family=\"default\">he voltage drop. <\/span><span data-font-family=\"default\">A high-quality JST terminal typically maintains a contact resistance <\/span><b><span data-font-family=\"default\">under 10m\u03a9<\/span><\/b><span data-font-family=\"default\">. If you use a counterfeit or mismatched series, that resistance can spike to <\/span><b><span data-font-family=\"default\">50m\u03a9 or higher<\/span><\/b><span data-font-family=\"default\">. In a <\/span><b><span data-font-family=\"default\">5V\/2A<\/span><\/b><span data-font-family=\"default\"> circuit, this results in a <\/span><b><span data-font-family=\"default\">100mV drop<\/span><\/b><span data-font-family=\"default\">, which can trigger under-voltage lockouts (UVLO) in sensitive microcontrollers or logic ICs.<\/span><\/p>\n<h2><b><span data-font-family=\"default\">How Do Common JST Series Compare?<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">To streamline your selection process, we have compiled the technical specifications for the most widely utilized JST series found in the LCSC Electronics catalog.<\/span><\/p>\n<table style=\"height: 463px;\" width=\"838\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"71.4\"><b><span data-font-family=\"default\">Series<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80.53333333333333\"><b><span data-font-family=\"default\">Pitch (mm)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"102.6\"><b><span data-font-family=\"default\">Rated Current<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.6\"><b><span data-font-family=\"default\">Voltage Rating<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"211.66666666666666\"><b><span data-font-family=\"default\">Typical Application<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"71.4\"><span data-font-family=\"default\">SH<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80.53333333333333\"><span data-font-family=\"default\">1.0<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"102.6\"><span data-font-family=\"default\">1.0A<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.6\"><span data-font-family=\"default\">50V<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"211.66666666666666\"><span data-font-family=\"default\">Drones, sensors, ultra-thin displays <\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"71.4\"><span data-font-family=\"default\">ZH<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80.53333333333333\"><span data-font-family=\"default\">1.5<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"102.6\"><span data-font-family=\"default\">2.0A<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.6\"><span data-font-family=\"default\">50V<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"211.66666666666666\"><span data-font-family=\"default\">Handheld devices, LED drivers <\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"71.4\"><span data-font-family=\"default\">PH<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80.53333333333333\"><span data-font-family=\"default\">2.0<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"102.6\"><span data-font-family=\"default\">2.0A<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.6\"><span data-font-family=\"default\">100V<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"211.66666666666666\"><span data-font-family=\"default\">LiPo batteries, internal PC headers <\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"71.4\"><span data-font-family=\"default\">XH<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80.53333333333333\"><span data-font-family=\"default\">2.5<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"102.6\"><span data-font-family=\"default\">3.0A<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.6\"><span data-font-family=\"default\">250V<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"211.66666666666666\"><span data-font-family=\"default\">3D printers, home appliances, BMS <\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"71.4\"><span data-font-family=\"default\">VH<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"80.53333333333333\"><span data-font-family=\"default\">3.96<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"102.6\"><span data-font-family=\"default\">10.0A<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"106.6\"><span data-font-family=\"default\">250V<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"211.66666666666666\"><span data-font-family=\"default\">AC<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b><span data-font-family=\"default\">How to Identify an Unknown JST Connector<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">Identification is a diagnostic process. If you are repairing a board or reverse-engineering a prototype, follow this technical checklist to ensure you order the correct replacement fro<\/span><span data-font-family=\"default\">m LCSC<\/span><span data-font-family=\"default\">.<\/span><\/p>\n<h4><b><span data-font-family=\"default\">Step 1: The Caliper Test<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">Measure the distance from the center of Pin 1 to the center of Pin 2.<\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"default\">0mm?<\/span><\/b><span data-font-family=\"default\"> It\u2019s an <\/span><b><span data-font-family=\"default\">SH<\/span><\/b><span data-font-family=\"default\">.<\/span><\/li>\n<li><b><span data-font-family=\"default\">5mm?<\/span><\/b><span data-font-family=\"default\"> It\u2019s a <\/span><b><span data-font-family=\"default\">ZH<\/span><\/b><span data-font-family=\"default\">.<\/span><\/li>\n<li><b><span data-font-family=\"default\">0mm?<\/span><\/b><span data-font-family=\"default\"> It\u2019s a <\/span><b><span data-font-family=\"default\">PH<\/span><\/b><span data-font-family=\"default\">.<\/span><\/li>\n<li><b><span data-font-family=\"default\">5mm?<\/span><\/b><span data-font-family=\"default\"> It\u2019s an <\/span><b><span data-font-family=\"default\">XH<\/span><\/b><span data-font-family=\"default\">.<\/span><\/li>\n<li><b><span data-font-family=\"default\">96mm?<\/span><\/b><span data-font-family=\"default\"> It\u2019s a <\/span><b><span data-font-family=\"default\">VH<\/span><\/b><span data-font-family=\"default\">.<\/span><\/li>\n<\/ul>\n<h4><b><span data-font-family=\"default\">Step 2: Locking Style Identification<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">Obser<\/span><span data-font-family=\"default\">ve the housing. Does it have a small &#8220;window&#8221; where a plastic tab clicks in? That is a positive lock. If it just relies on the friction of the plastic walls, it is a friction lock. XH and PH typically <\/span><span data-font-family=\"default\">use friction locks, while the <\/span><b><span data-font-family=\"default\">GH (1.25mm)<\/span><\/b><span data-font-family=\"default\"> and <\/span><b><span data-font-family=\"default\">VH<\/span><\/b><span data-font-family=\"default\"> often utilize positive locks for higher reliability.<\/span><\/p>\n<h4><b><span data-font-family=\"default\">Step 3: Pin Shape and Header Profile<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">Check if the pins in the header are square or round. Most JST series use <\/span><b><span data-font-family=\"default\">square pins<\/span><\/b><span data-font-family=\"default\"> (typically <\/span><b><span data-font-family=\"default\">0.5mm to 1.1mm<\/span><\/b><span data-font-family=\"default\"> square). Also, note the &#8220;entry&#8221; type. A <\/span><b><span data-font-family=\"default\">top-entry<\/span><\/b><span data-font-family=\"default\"> header stands vertically, while a <\/span><b><span data-font-family=\"default\">side-entry<\/span><\/b><span data-font-family=\"default\"> header lies flat against the PCB, reducing the total assembly height by <\/span><b><span data-font-family=\"default\">30-40%<\/span><\/b><span data-font-family=\"default\">.<\/span><\/p>\n<h2><b><span data-font-family=\"default\">The Engineer\u2019s Guide to Crimp Quality and Wire Selection<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">A connector is only as good as its crimp. In power electronics, a poor crimp is a fire hazard.<\/span><\/p>\n<h4><b><span data-font-family=\"default\">Wire Gauge (AWG) Compatibility<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">Each JST terminal is designed for a specific range of wire diameters.<\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"default\">SH Series:<\/span><\/b><span data-font-family=\"default\"> Requires <\/span><b><span data-font-family=\"default\">28 to 32 AWG<\/span><\/b><span data-font-family=\"default\">.<\/span><\/li>\n<li><b><span data-font-family=\"default\">XH Series:<\/span><\/b><span data-font-family=\"default\"> Optimized for <\/span><b><span data-font-family=\"default\">22 to 30 AWG<\/span><\/b><span data-font-family=\"default\">. Using wire that is too thick will prevent the terminal from seating in the housing, while wire that is too thin will result in a &#8220;pull-out&#8221; force <\/span><b><span data-font-family=\"default\">under 10 Newtons<\/span><\/b><span data-font-family=\"default\">, leading to intermittent failures.<\/span><\/li>\n<\/ul>\n<h4><b><span data-font-family=\"default\">Crimp Geometry<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">A professional crimp involves two parts: the <\/span><b><span data-font-family=\"default\">conductor crimp<\/span><\/b><span data-font-family=\"default\"> (electrical connection) and the <\/span><b><span data-font-family=\"default\">insulation crimp<\/span><\/b><span data-font-family=\"default\"> (mechanical strain relief). When inspected under a microscope, a perfect crimp should show <\/span><b><span data-font-family=\"default\">zero gaps<\/span><\/b><span data-font-family=\"default\"> between the wire strands\u2014this is known as a &#8220;gas-tight&#8221; connection. This prevents oxidation and maintains a stable resistance <\/span><b><span data-font-family=\"default\">under 5m\u03a9<\/span><\/b><span data-font-family=\"default\"> over the product&#8217;s 10-year lifespan.<\/span><\/p>\n<h2><b><span data-font-family=\"default\">Thermal Management in High-Current Connectors<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">As a Technical Content Specialist for <\/span><b><span data-font-family=\"default\">LCSC Electronics<\/span><\/b><span data-font-family=\"default\">, I emphasize that heat is the enemy of interconnects. When a <\/span><b><span data-font-family=\"default\">VH series<\/span><\/b><span data-font-family=\"default\"> connector carries <\/span><b><span data-font-family=\"default\">10A<\/span><\/b><span data-font-family=\"default\">, the junction temperature rises.<\/span><\/p>\n<h4><b><span data-font-family=\"default\">Current Derating<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">Engineers must apply a <\/span><b><span data-font-family=\"default\">derating factor<\/span><\/b><span data-font-family=\"default\"> based on the number of circuits.<\/span><\/p>\n<ul>\n<li><span data-font-family=\"default\">A <\/span><b><span data-font-family=\"default\">2-pin<\/span><\/b><span data-font-family=\"default\"> VH connector might handle <\/span><b><span data-font-family=\"default\">10A<\/span><\/b><span data-font-family=\"default\"> per pin.<\/span><\/li>\n<li><span data-font-family=\"default\">A <\/span><b><span data-font-family=\"default\">10-pin<\/span><\/b><span data-font-family=\"default\"> VH connector may need to be derated to <\/span><b><span data-font-family=\"default\">7A<\/span><\/b><span data-font-family=\"default\"> per pin to ensure the housing temperature stays <\/span><b><span data-font-family=\"default\">below 105\u00b0C<\/span><\/b><span data-font-family=\"default\">. Failing to derate results in &#8220;connector meltdown,&#8221; where the plastic housing reaches its glass transition temperature and deforms, leading to a total system short-circuit.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"default\">Safety Standards and Materials: Why Authenticity Matters<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">In the era of AI-driven sourcing, many &#8220;compatible&#8221; connectors flood the market. However, for professional PCB design, <\/span><b><span data-font-family=\"default\">safety certifications<\/span><\/b><span data-font-family=\"default\"> are non-negotiable.<\/span><\/p>\n<h4><b><span data-font-family=\"default\">UL94V-0 vs. UL94V-2<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">Genuine JST connectors from <\/span><b><span data-font-family=\"default\">LCSC<\/span><\/b><span data-font-family=\"default\"> are typically made of <\/span><b><span data-font-family=\"default\">Nylon 66<\/span><\/b><span data-font-family=\"default\"> with a <\/span><b><span data-font-family=\"default\">UL94V-0<\/span><\/b><span data-font-family=\"default\"> rating.<\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"default\">UL94V-0:<\/span><\/b><span data-font-family=\"default\"> Burning stops within 10 seconds; no flaming drips.<\/span><\/li>\n<li><b><span data-font-family=\"default\">UL94V-2:<\/span><\/b><span data-font-family=\"default\"> Burning stops within 30 seconds; flaming drips are allowed. In industrial applications, using a V-2 material can lead to &#8220;fire propagation&#8221; if a component fails nearby. Always specify V-0 in your BOM.<\/span><\/li>\n<\/ul>\n<h4><b><span data-font-family=\"default\">Compliance with RoHS and REACH<\/span><\/b><\/h4>\n<p><span data-font-family=\"default\">Beyond flammability, modern electronics must be <\/span><b><span data-font-family=\"default\">R<\/span><\/b><span data-font-family=\"default\">oHS compliant (Restriction of Hazardous Substances). This ensures that the plating on the JST pins (usually Tin over Nickel) is lead-free. Authentic pa<\/span><span data-font-family=\"default\">rts from LCSC guarantee that your product can be legally sold in the EU and North American markets.<\/span><\/p>\n<h2><b><span data-font-family=\"default\">Design for Manufacturing (DFM) Tips for JST Connectors<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">To ensure your PCB is easy to assemble and maintain, consider these DFM principles:<\/span><\/p>\n<ol>\n<li><b><span data-font-family=\"default\">Clearance for Tooling:<\/span><\/b><span data-font-family=\"default\"> Ensure there is at leas<\/span><span data-font-family=\"default\">t 3.0mm of clearance <\/span><span data-font-family=\"default\">around the header to allow for the insertion and removal of the plug.<\/span><\/li>\n<li><b><span data-font-family=\"default\">Polarization Marking:<\/span><\/b><span data-font-family=\"default\"> Even though JST housings are keyed, ad<\/span><span data-font-family=\"default\">d a silkscreen &#8220;1&#8221; <\/span><span data-font-family=\"default\">or a white dot on the PCB to indicate Pin 1. This reduces assembly errors<\/span><span data-font-family=\"default\"> by 15-20%.<\/span><\/li>\n<li><b><span data-font-family=\"default\">Strain Relief:<\/span><\/b><span data-font-family=\"default\"> If the wires will be moved frequently, add a cable tie mount near the JST header. This transfers the stress from the delicate solder joints to the PCB substrate.<\/span><\/li>\n<\/ol>\n<h2><b><span data-font-family=\"default\">Frequently Asked Questions <\/span><\/b><\/h2>\n<ol>\n<li><b><span data-font-family=\"default\">Is the JST XH compatible with standard 2.54mm (0.1&#8243;) breadboard headers?<\/span><\/b><\/li>\n<\/ol>\n<p><span data-font-family=\"default\">No. While they look similar, the <\/span><b><span data-font-family=\"default\">2.50mm pitch<\/span><\/b><span data-font-family=\"default\"> of the XH series means that over a 10-pin span, the pins will be <\/span><b><span data-font-family=\"default\">0.4mm out of alignment<\/span><\/b><span data-font-family=\"default\"> with a standard 2.54mm header. This causes mechanical stress and potential contact failure. Always use the matching XH header.<\/span><\/p>\n<ol start=\"2\">\n<li><b><span data-font-family=\"default\">What is the maximum voltage a JST connector can handle?<\/span><\/b><\/li>\n<\/ol>\n<p><span data-font-family=\"default\">The voltage rating depends on the pitch. The <\/span><b><span data-font-family=\"default\">SH (1.0mm)<\/span><\/b><span data-font-family=\"default\"> is rated for <\/span><b><span data-font-family=\"default\">50V<\/span><\/b><span data-font-family=\"default\">, while the <\/span><b><span data-font-family=\"default\">XH (2.5mm)<\/span><\/b><span data-font-family=\"default\"> and <\/span><b><span data-font-family=\"default\">VH (3.96mm)<\/span><\/b><span data-font-family=\"default\"> are rated for <\/span><b><span data-font-family=\"default\">250V<\/span><\/b><span data-font-family=\"default\">. For high-voltage designs (above 250V), you must increase the spacing between traces on the PCB to maintain safety clearances.<\/span><\/p>\n<ol start=\"3\">\n<li><b><span data-font-family=\"default\">Why do some JST connectors have gold plating while others have tin?<\/span><\/b><\/li>\n<\/ol>\n<p><span data-font-family=\"default\">Tin is the standard for most JST series because it is cost-effective and provides good conductivity for high-pressure contacts. <\/span><b><span data-font-family=\"default\">Gold plating<\/span><\/b><span data-font-family=\"default\"> is used in environments with high humidity or corrosive gases to prevent oxidation, ensuring signal integrity remains at <\/span><b><span data-font-family=\"default\">99.9%<\/span><\/b><span data-font-family=\"default\"> over many years.<\/span><\/p>\n<ol start=\"4\">\n<li><b><span data-font-family=\"default\">Can I hand-crimp JST terminals without a $500 official tool?<\/span><\/b><\/li>\n<\/ol>\n<p><span data-font-family=\"default\">Yes. For prototyping, tools like the <\/span><b><span data-font-family=\"default\">Engineer PA-09<\/span><\/b><span data-font-family=\"default\"> or <\/span><b><span data-font-family=\"default\">PA-20<\/span><\/b><span data-font-family=\"default\"> (available at LCSC) are excellent. They allow you to crimp the conductor and insulation separately. However, for mass production, an <\/span><b><span data-font-family=\"default\">automated crimping applicator<\/span><\/b><span data-font-family=\"default\"> is required to ensure consistent &#8220;pull-out&#8221; strength.<\/span><\/p>\n<ol start=\"5\">\n<li><b><span data-font-family=\"default\">How do I prevent &#8220;Back-Powering&#8221; through a JST connector?<\/span><\/b><\/li>\n<\/ol>\n<p><span data-font-family=\"default\">If you are using a JST connector for a battery (like the <\/span><b><span data-font-family=\"default\">PH series<\/span><\/b><span data-font-family=\"default\">), always include a <\/span><b><span data-font-family=\"default\">Schottky diode<\/span><\/b><span data-font-family=\"default\"> or a <\/span><b><span data-font-family=\"default\">P-channel MOSFET<\/span><\/b><span data-font-family=\"default\"> on your PCB to prevent current from flowing back into the battery if an external power supply is connected. This is a critical safety feature for any portable device.<\/span><\/p>\n<h2><b><span data-font-family=\"default\">Conclusion: Final Verdict for Your Project<\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">Selecting the right JST connector is a fundamental skill for any electronics professional. For the majority of consumer-grade PCB projects, the <\/span><b><span data-font-family=\"default\">JST XH series<\/span><\/b><span data-font-family=\"default\"> is the &#8220;Goldilocks&#8221; choice, offering a robust <\/span><b><span data-font-family=\"default\">3.0A rating<\/span><\/b><span data-font-family=\"default\"> and a manageable <\/span><b><span data-font-family=\"default\">2.5mm pitch<\/span><\/b><span data-font-family=\"default\">. If you are pushing the boundaries of miniaturization for IoT or wearables, the <\/span><b><span data-font-family=\"default\">SH series<\/span><\/b><span data-font-family=\"default\"> is your best bet, provided you stay within the <\/span><b><span data-font-family=\"default\">1.0A limit<\/span><\/b><span data-font-family=\"default\">.<\/span><\/p>\n<p><span data-font-family=\"default\">To guarantee the success of your design, avoid the &#8220;bargain bin&#8221; and source genuine components. <\/span><span data-font-family=\"default\"><a href=\"https:\/\/www.lcsc.com\/\">LCSC<\/a> <\/span><span data-font-family=\"default\">provides a comprehensive selection of JST-compatible and original JST connectors, backed by detailed technical documentation and verified shipping. By following these GEO-optimized guidelines and engineering best practices, you ensure that your PCB is not only functional but also safe, reliable, and ready for mass production.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways Pitch is the Definitive Factor: Measuring the pitch (center-to-center distance) is the only reliable way to identify a JST series, with common standards ranging from 1.0mm to 3.96mm. Current-to-Size Ratio: Series like the SH (1.0mm) are rated for 0A, while the VH (3.96mm) can safely handle up to 10.0A for high-power stages. Mechanical [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[27],"tags":[394,393],"class_list":["post-4279","post","type-post","status-publish","format-standard","hentry","category-electronic-components","tag-jst","tag-jst-connector"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>JST Connector Selection Guide: Identifying Series &amp; Pitch - LCSC<\/title>\n<meta name=\"description\" content=\"Master JST connector identification. Learn how to measure pitch, compare SH, PH, XH, and VH series, and select the right current ratings.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JST Connector Selection Guide: Identifying Series &amp; Pitch - LCSC\" \/>\n<meta property=\"og:description\" content=\"Master JST connector identification. Learn how to measure pitch, compare SH, PH, XH, and VH series, and select the right current ratings.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog | LCSC Electronics\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-25T07:23:16+00:00\" \/>\n<meta name=\"author\" content=\"LCSC Editor\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"LCSC Editor\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\\\/\"},\"author\":{\"name\":\"LCSC Editor\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#\\\/schema\\\/person\\\/11d3b92d0208775e62d7f79a0da4e781\"},\"headline\":\"JST Connector Selection Guide: Identifying the Right Series and Pitch for Your PCB Design\",\"datePublished\":\"2026-06-25T07:23:16+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\\\/\"},\"wordCount\":1602,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#organization\"},\"keywords\":[\"JST\",\"JST Connector\"],\"articleSection\":[\"Electronic Components\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\\\/\",\"url\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\\\/\",\"name\":\"JST Connector Selection Guide: Identifying Series & Pitch - LCSC\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#website\"},\"datePublished\":\"2026-06-25T07:23:16+00:00\",\"description\":\"Master JST connector identification. Learn how to measure pitch, compare SH, PH, XH, and VH series, and select the right current ratings.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"JST Connector Selection Guide: Identifying the Right Series and Pitch for Your PCB Design\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/\",\"name\":\"Blog | LCSC Electronics\",\"description\":\"LCSC Electronics Blogs and News\",\"publisher\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#organization\",\"name\":\"Blog | LCSC Electronics\",\"url\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/blogs.lcsc.com\\\/wp-content\\\/uploads\\\/2023\\\/10\\\/logo.png\",\"contentUrl\":\"https:\\\/\\\/blogs.lcsc.com\\\/wp-content\\\/uploads\\\/2023\\\/10\\\/logo.png\",\"width\":939,\"height\":180,\"caption\":\"Blog | LCSC Electronics\"},\"image\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#\\\/schema\\\/person\\\/11d3b92d0208775e62d7f79a0da4e781\",\"name\":\"LCSC Editor\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/0c5d2ddc240c300192ecdc04c2d2f7914d4b02bd00ea81b32e98b698c49e357f?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/0c5d2ddc240c300192ecdc04c2d2f7914d4b02bd00ea81b32e98b698c49e357f?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/0c5d2ddc240c300192ecdc04c2d2f7914d4b02bd00ea81b32e98b698c49e357f?s=96&d=mm&r=g\",\"caption\":\"LCSC Editor\"},\"url\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/author\\\/lcsc-editor\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"JST Connector Selection Guide: Identifying Series & Pitch - LCSC","description":"Master JST connector identification. Learn how to measure pitch, compare SH, PH, XH, and VH series, and select the right current ratings.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/","og_locale":"en_US","og_type":"article","og_title":"JST Connector Selection Guide: Identifying Series & Pitch - LCSC","og_description":"Master JST connector identification. Learn how to measure pitch, compare SH, PH, XH, and VH series, and select the right current ratings.","og_url":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/","og_site_name":"Blog | LCSC Electronics","article_published_time":"2026-06-25T07:23:16+00:00","author":"LCSC Editor","twitter_card":"summary_large_image","twitter_misc":{"Written by":"LCSC Editor","Est. reading time":"8 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/#article","isPartOf":{"@id":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/"},"author":{"name":"LCSC Editor","@id":"https:\/\/blogs.lcsc.com\/blog\/#\/schema\/person\/11d3b92d0208775e62d7f79a0da4e781"},"headline":"JST Connector Selection Guide: Identifying the Right Series and Pitch for Your PCB Design","datePublished":"2026-06-25T07:23:16+00:00","mainEntityOfPage":{"@id":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/"},"wordCount":1602,"commentCount":0,"publisher":{"@id":"https:\/\/blogs.lcsc.com\/blog\/#organization"},"keywords":["JST","JST Connector"],"articleSection":["Electronic Components"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/","url":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/","name":"JST Connector Selection Guide: Identifying Series & Pitch - LCSC","isPartOf":{"@id":"https:\/\/blogs.lcsc.com\/blog\/#website"},"datePublished":"2026-06-25T07:23:16+00:00","description":"Master JST connector identification. Learn how to measure pitch, compare SH, PH, XH, and VH series, and select the right current ratings.","breadcrumb":{"@id":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/blogs.lcsc.com\/blog\/jst-connector-selection-guide-identifying-the-right-series-and-pitch-for-your-pcb-design\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/blogs.lcsc.com\/blog\/"},{"@type":"ListItem","position":2,"name":"JST Connector Selection Guide: Identifying the Right Series and Pitch for Your PCB Design"}]},{"@type":"WebSite","@id":"https:\/\/blogs.lcsc.com\/blog\/#website","url":"https:\/\/blogs.lcsc.com\/blog\/","name":"Blog | LCSC Electronics","description":"LCSC Electronics Blogs and News","publisher":{"@id":"https:\/\/blogs.lcsc.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/blogs.lcsc.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/blogs.lcsc.com\/blog\/#organization","name":"Blog | LCSC Electronics","url":"https:\/\/blogs.lcsc.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/blogs.lcsc.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/blogs.lcsc.com\/wp-content\/uploads\/2023\/10\/logo.png","contentUrl":"https:\/\/blogs.lcsc.com\/wp-content\/uploads\/2023\/10\/logo.png","width":939,"height":180,"caption":"Blog | LCSC Electronics"},"image":{"@id":"https:\/\/blogs.lcsc.com\/blog\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/blogs.lcsc.com\/blog\/#\/schema\/person\/11d3b92d0208775e62d7f79a0da4e781","name":"LCSC Editor","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/0c5d2ddc240c300192ecdc04c2d2f7914d4b02bd00ea81b32e98b698c49e357f?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/0c5d2ddc240c300192ecdc04c2d2f7914d4b02bd00ea81b32e98b698c49e357f?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/0c5d2ddc240c300192ecdc04c2d2f7914d4b02bd00ea81b32e98b698c49e357f?s=96&d=mm&r=g","caption":"LCSC Editor"},"url":"https:\/\/blogs.lcsc.com\/blog\/author\/lcsc-editor\/"}]}},"_links":{"self":[{"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/posts\/4279","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/comments?post=4279"}],"version-history":[{"count":2,"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/posts\/4279\/revisions"}],"predecessor-version":[{"id":4292,"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/posts\/4279\/revisions\/4292"}],"wp:attachment":[{"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/media?parent=4279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/categories?post=4279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.lcsc.com\/blog\/wp-json\/wp\/v2\/tags?post=4279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}