{"id":4062,"date":"2026-06-04T06:02:36","date_gmt":"2026-06-04T06:02:36","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=4062"},"modified":"2026-06-04T06:05:21","modified_gmt":"2026-06-04T06:05:21","slug":"ams1117-voltage-regulator-complete-guide","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/ams1117-voltage-regulator-complete-guide\/","title":{"rendered":"AMS1117 Voltage Regulator: Specs, Circuits &#038; Selection Guide"},"content":{"rendered":"<h2><strong>Key Takeaways:<\/strong><\/h2>\n<ul>\n<li>The <a href=\"https:\/\/www.lcsc.com\/category\/1032.html?scene=FULL_MATCH&amp;globalKeyword=AMS1117&amp;s_z=n_q_AMS1117\">AMS1117<\/a> is a low-dropout (LDO) linear voltage regulator.<\/li>\n<li>Output up to 800 mA with 1.1\u20131.3 V dropout from a PNP pass transistor<\/li>\n<li>Fixed options from 1.2 V to 5.0 V; adjustable output with two external resistors<\/li>\n<li>Requires output capacitor ESR of 0.3\u201322 \u03a9 for stable operation<\/li>\n<li>Thermal management is critical at full load \u2014 use copper pour on SOT-223<\/li>\n<li>Broad second-source availability makes dual-sourcing straightforward<\/li>\n<li>Not ideal for battery designs; quiescent current of 5\u201310 mA is high for light-load use<\/li>\n<\/ul>\n<h2>What Is the AMS1117 Voltage Regulator?<\/h2>\n<p>The AMS1117 is a low-dropout linear voltage regulator IC. It delivers a stable DC output from a higher DC input voltage. Engineers widely deploy it in embedded systems, consumer electronics, and industrial boards.<\/p>\n<p>It supports fixed outputs of 1.2 V, 1.5 V, 1.8 V, 2.5 V, 2.85 V, 3.0 V, 3.3 V, and 5.0 V. An adjustable variant also exists for custom output voltages. Therefore, it covers most digital, analogue, and RF supply rails.<\/p>\n<div>In a complete power system, voltage regulation follows rectification and filtering \u2014 learn more in our <a href=\"https:\/\/www.blogs.lcsc.com\/blog\/ac-to-dc-converter-basics\/\"><strong>AC to DC converter guide<\/strong><\/a>.<\/div>\n<h3>How the AMS1117 LDO Regulates Output<\/h3>\n<p>The AMS1117 uses three terminals: input (VIN), output (VOUT), and ground (GND). The adjustable variant replaces GND with an adjust pin (ADJ). An internal bandgap reference and error amplifier compare the output to a 1.25 V reference. As a result, the device maintains a stable output despite load or input fluctuations.<\/p>\n<h2>Key AMS1117 Voltage Regulator Specifications<\/h2>\n<p>The table below summarises the main electrical and thermal parameters. Values come from the AMS datasheet (Revision B) at typical conditions. Always verify worst-case limits in the full datasheet.<\/p>\n<table style=\"height: 818px;\" width=\"525\">\n<thead>\n<tr>\n<td width=\"160\"><strong>Parameter<\/strong><\/td>\n<td width=\"67\"><strong>Symbol<\/strong><\/td>\n<td width=\"80\"><strong>Value<\/strong><\/td>\n<td width=\"47\"><strong>Unit<\/strong><\/td>\n<td width=\"173\"><strong>Notes<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"160\"><strong>Input Voltage (Max)<\/strong><\/td>\n<td width=\"67\">VIN<\/td>\n<td width=\"80\">15<\/td>\n<td width=\"47\">V<\/td>\n<td width=\"173\">Derate with temperature<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Output Voltage (Fixed)<\/td>\n<td width=\"67\">VOUT<\/td>\n<td width=\"80\">1.2 \u2013 5.0<\/td>\n<td width=\"47\">V<\/td>\n<td width=\"173\">Factory-trimmed \u00b11%<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Output Current (Max)<\/td>\n<td width=\"67\">IOUT<\/td>\n<td width=\"80\">800<\/td>\n<td width=\"47\">mA<\/td>\n<td width=\"173\">1 A peak; thermally limited<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Dropout Voltage<\/td>\n<td width=\"67\">VDO<\/td>\n<td width=\"80\">1.1 \u2013 1.3<\/td>\n<td width=\"47\">V<\/td>\n<td width=\"173\">At 800 mA, 25 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Quiescent Current<\/td>\n<td width=\"67\">IQ<\/td>\n<td width=\"80\">5 \u2013 10<\/td>\n<td width=\"47\">mA<\/td>\n<td width=\"173\">Flows to output<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Line Regulation<\/td>\n<td width=\"67\">\u2014<\/td>\n<td width=\"80\">0.2<\/td>\n<td width=\"47\">%\/V<\/td>\n<td width=\"173\">Over VIN range<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Load Regulation<\/td>\n<td width=\"67\">\u2014<\/td>\n<td width=\"80\">0.4<\/td>\n<td width=\"47\">%<\/td>\n<td width=\"173\">0 to 800 mA<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Operating Temp.<\/td>\n<td width=\"67\">TA<\/td>\n<td width=\"80\">\u221240 to +85<\/td>\n<td width=\"47\">\u00b0C<\/td>\n<td width=\"173\">Commercial\/industrial<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Junction Temp. (Max)<\/td>\n<td width=\"67\">TJ<\/td>\n<td width=\"80\">125<\/td>\n<td width=\"47\">\u00b0C<\/td>\n<td width=\"173\">Shutdown near 150 \u00b0C<\/td>\n<\/tr>\n<tr>\n<td width=\"160\">Thermal Resistance (SOT-223)<\/td>\n<td width=\"67\">\u03b8JA<\/td>\n<td width=\"80\">~60<\/td>\n<td width=\"47\">\u00b0C\/W<\/td>\n<td width=\"173\">Improves with copper pour<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>AMS1117 Thermal Management Calculation<\/h3>\n<p>Thermal design is critical at full load. For example, at 800 mA with VIN = 5 V and VOUT = 3.3 V, power dissipation equals (5 \u2212 3.3) \u00d7 0.8 = <strong>1.36 W<\/strong>.<\/p>\n<p>In a SOT-223 package with \u03b8JA = 60 \u00b0C\/W and 40 \u00b0C ambient, junction temperature reaches ~122 \u00b0C. That is dangerously close to the 125 \u00b0C maximum. However, adding a 1 cm\u00b2 copper pour beneath the thermal pad reduces \u03b8JA to 35\u201340 \u00b0C\/W, providing comfortable thermal margin.<\/p>\n<h2>AMS1117 Key Features and Advantages<\/h2>\n<p>The AMS1117 delivers several practical engineering advantages:<\/p>\n<ul>\n<li><strong>Low Dropout Voltage: <\/strong>A 1.1\u20131.3 V dropout enables 3.3 V regulation from a 5 V USB rail, where higher-dropout devices like the LM7805 would fail.<\/li>\n<li><strong>Wide Output Range: <\/strong>Fixed options from 1.2 V to 5.0 V plus an adjustable version cover most embedded supply rails.<\/li>\n<li><strong>Integrated Protection: <\/strong>Built-in current limiting and thermal shutdown simplify designs compared to discrete pass-transistor solutions.<\/li>\n<li><strong>Strong Regulation: <\/strong>Line regulation of 0.2%\/V and load regulation of 0.4% keep rails stable across varying loads.<\/li>\n<li><strong>Multiple Packages: <\/strong>SOT-223, SOT-89, TO-252, and TO-220 support dense SMD boards and hand-soldered prototypes.<\/li>\n<\/ul>\n<h2>AMS1117 Circuit Configuration Options<\/h2>\n<h3>Fixed-Voltage AMS1117 Circuit<\/h3>\n<p>Fixed-voltage variants arrive pre-trimmed to \u00b11% output accuracy. First, add a 10 \u00b5F ceramic or tantalum input capacitor. Next, add a 10 \u00b5F output capacitor with ESR between 0.3 \u03a9 and 22 \u03a9 for stable compensation. That is all the external circuitry required.<\/p>\n<h3>Adjustable AMS1117 Output Voltage Formula<\/h3>\n<p>The adjustable variant uses an external resistor divider between VOUT, ADJ, and GND:<\/p>\n<p><strong>VOUT = 1.25 \u00d7 (1 + R2\/R1)<\/strong><\/p>\n<p>Use R1 = 120\u2013240 \u03a9 to minimise adjust-pin current errors. For instance, to set 2.5 V with R1 = 120 \u03a9: R2 = 120 \u00d7 ((2.5\/1.25) \u2212 1) = <strong>120 \u03a9<\/strong>. Use 1% tolerance resistors for best accuracy.<\/p>\n<h3>AMS1117 Package Selection Guide<\/h3>\n<table style=\"height: 398px;\" width=\"503\">\n<thead>\n<tr>\n<td width=\"120\"><strong>Package<\/strong><\/td>\n<td width=\"147\"><strong>Thermal Resistance<\/strong><\/td>\n<td width=\"260\"><strong>Best For<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"120\"><strong>SOT-223<\/strong><\/td>\n<td width=\"147\">~60 \u00b0C\/W<\/td>\n<td width=\"260\">Dense SMD boards; copper pour adds margin<\/td>\n<\/tr>\n<tr>\n<td width=\"120\">SOT-89<\/td>\n<td width=\"147\">~75 \u00b0C\/W<\/td>\n<td width=\"260\">Compact low-power applications<\/td>\n<\/tr>\n<tr>\n<td width=\"120\">TO-252 (DPAK)<\/td>\n<td width=\"147\">~40 \u00b0C\/W<\/td>\n<td width=\"260\">Higher dissipation with board heatsink<\/td>\n<\/tr>\n<tr>\n<td width=\"120\">TO-220<\/td>\n<td width=\"147\">~20 \u00b0C\/W<\/td>\n<td width=\"260\">Maximum dissipation; through-hole or bolt-on heatsink<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Common AMS1117 Application Scenarios<\/h2>\n<h3>MCU Power Rails: 3.3 V from 5 V USB<\/h3>\n<p>The most common use places an AMS1117-3.3 between a USB connector and a 3.3 V MCU. The 1.7 V headroom exceeds the worst-case 1.3 V dropout. Therefore, regulation holds across the full USB tolerance range of 4.75\u20135.25 V. Add 10 \u00b5F tantalum in parallel with 100 nF ceramic at input and output.<\/p>\n<h3>FPGA and CPLD Auxiliary Supplies<\/h3>\n<p>FPGAs often need multiple rails at 1.2 V, 1.8 V, and 3.3 V. The AMS1117 efficiently handles lower-current auxiliary and I\/O bank rails under 500 mA. In addition, a switching pre-regulator can supply the high-current core rail. This two-stage approach combines efficiency with low-noise LDO regulation.<\/p>\n<h3>Wi-Fi and Bluetooth Module Regulation<\/h3>\n<p>RF modules such as the ESP-12, CC2530, and nRF52840 are sensitive to supply noise. Ripple degrades receiver sensitivity and increases transmission errors. However, the AMS1117\u2019s switching-free architecture and ~65 dB PSRR at 120 Hz make it ideal as a post-regulator after a switching converter.<\/p>\n<h3>ADC Reference Voltage Generation<\/h3>\n<p>The adjustable AMS1117 with precision resistors generates stable reference-like voltages. Its 1% accuracy and low noise floor suit 10-bit to 12-bit ADC VREF and DAC supply applications. For instance, this approach avoids the cost and complexity of a dedicated shunt reference in mid-resolution systems.<\/p>\n<h2>AMS1117 vs Alternatives: Voltage Regulator Comparison<\/h2>\n<table style=\"height: 612px;\" width=\"504\">\n<thead>\n<tr>\n<td width=\"100\"><strong>Component<\/strong><\/td>\n<td width=\"73\"><strong>Dropout<\/strong><\/td>\n<td width=\"80\"><strong>Max Current<\/strong><\/td>\n<td width=\"107\"><strong>Package<\/strong><\/td>\n<td width=\"167\"><strong>Best For<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td width=\"100\"><strong>AMS1117 (this guide)<\/strong><\/td>\n<td width=\"73\">1.1\u20131.3 V<\/td>\n<td width=\"80\">800 mA<\/td>\n<td width=\"107\">SOT-223 \/ TO-252<\/td>\n<td width=\"167\">General-purpose 3.3 V \/ 5 V embedded rails<\/td>\n<\/tr>\n<tr>\n<td width=\"100\">LM7805<\/td>\n<td width=\"73\">2.0\u20132.5 V<\/td>\n<td width=\"80\">1.0 A<\/td>\n<td width=\"107\">TO-220 \/ TO-92<\/td>\n<td width=\"167\">Legacy 5 V designs with ample headroom<\/td>\n<\/tr>\n<tr>\n<td width=\"100\">MCP1700<\/td>\n<td width=\"73\">0.18 V<\/td>\n<td width=\"80\">250 mA<\/td>\n<td width=\"107\">SOT-23-3<\/td>\n<td width=\"167\">Battery IoT with 1.6 \u00b5A quiescent current<\/td>\n<\/tr>\n<tr>\n<td width=\"100\">LT1761<\/td>\n<td width=\"73\">0.3 V<\/td>\n<td width=\"80\">100 mA<\/td>\n<td width=\"107\">SOT-23-5<\/td>\n<td width=\"167\">Low-noise RF and precision analogue<\/td>\n<\/tr>\n<tr>\n<td width=\"100\">TLV1117<\/td>\n<td width=\"73\">1.1 V<\/td>\n<td width=\"80\">800 mA<\/td>\n<td width=\"107\">SOT-223 \/ TO-252<\/td>\n<td width=\"167\">Direct pin-compatible LM1117 drop-in<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>For most 3.3 V rails from 5 V USB, the AMS1117 is the pragmatic choice. It costs under $0.10 in volume and needs no external inductor or controller. However, battery-operated designs should evaluate the MCP1700 or a buck converter instead. Quiescent current savings of 10\u00d7 or more can dramatically extend battery life.<\/p>\n<div>For applications requiring higher efficiency or battery operation, consider a switching solution \u2014 see our guide on <a href=\"http:\/\/blogs.lcsc.com\/blog\/ldo-vs-dc-dc-converter-how-to-choose-the-right-power-regulator-for-your-design\/\"><strong>LDO vs DC-DC converters<\/strong><\/a>.<\/div>\n<h2>AMS1117 Procurement Guide<\/h2>\n<p>The AMS1117 benefits from one of the broadest second-source ecosystems among LDO regulators. Manufacturers include Advanced Monolithic Systems, Diodes Incorporated, HTC Korea, and UTC. As a result, dual-sourcing strategies are straightforward to implement.<\/p>\n<h3>Where to Buy AMS1117 Components<\/h3>\n<p>Distributors such as Mouser, DigiKey, and LCSC stock millions of units across all voltage variants. Typical lead times run 1\u20132 weeks for standard orders. Minimum order quantities start at one unit in cut-tape, making the device accessible for prototyping and volume production alike.<\/p>\n<h3>AMS1117 Quality and Compliance<\/h3>\n<p>End-of-line testing follows JEDEC standards, covering output accuracy, dropout, quiescent current, and thermal shutdown. All mainstream suppliers offer halogen-free, Pb-free variants. Furthermore, AEC-Q100 Grade B qualification is available from select suppliers such as Diodes Inc. (AP1117) for automotive-adjacent industrial applications.<\/p>\n<h2>Frequently Asked Questions<\/h2>\n<h3>How do I calculate resistors for the adjustable AMS1117?<\/h3>\n<p>Use VOUT = 1.25 \u00d7 (1 + R2\/R1). For 2.5 V with R1 = 120 \u03a9, R2 = 120 \u03a9. The adjust pin draws ~50 \u00b5A. Therefore, compensate by recalculating R2 = (VOUT\/1.25 \u2212 1) \u00d7 R1 \u2212 IADJ \u00d7 R2. Always use 1% resistors.<\/p>\n<h3>What ESR does the AMS1117 output capacitor require?<\/h3>\n<p>The AMS1117 needs an output capacitor ESR between 0.3 \u03a9 and 22 \u03a9. Very low-ESR ceramics (below ~50 m\u03a9) can cause oscillation. As a result, add a 1\u20133 \u03a9 series resistor when using ceramics. Tantalum capacitors in the 10\u2013100 \u00b5F range fall within the stable ESR window naturally.<\/p>\n<h3>Is the AMS1117 suitable for automotive use?<\/h3>\n<p>Standard commercial-grade parts are rated to 85 \u00b0C ambient \u2014 insufficient for under-hood automotive environments. However, AEC-Q100-qualified variants from Diodes Inc. are rated for extended temperature ranges. Always verify the manufacturer\u2019s qualification status before specifying in automotive designs.<\/p>\n<h3>How does AMS1117 quiescent current affect battery life?<\/h3>\n<p>The AMS1117 draws 5\u201310 mA quiescent current. In a design drawing 10 mA average load, quiescent current represents 33\u201350% of total consumption. Therefore, switching to an LDO with sub-10 \u00b5A quiescent current \u2014 such as the MCP1700 at 1.6 \u00b5A \u2014 can extend battery life by 10\u00d7 or more.<\/p>\n<h3>What is the maximum power dissipation in SOT-223?<\/h3>\n<p>At 25 \u00b0C ambient with \u03b8JA = 60 \u00b0C\/W, the SOT-223 package dissipates a maximum of (125 \u2212 25)\/60 = <strong>1.67 W<\/strong>. At 40 \u00b0C this drops to 1.42 W. However, a 1 cm\u00b2 copper pour reduces \u03b8JA to ~35 \u00b0C\/W, raising capability to ~2.43 W at 40 \u00b0C \u2014 adequate for full 800 mA operation.<\/p>\n<h2>Conclusion<\/h2>\n<p>The AMS1117 voltage regulator remains the go-to LDO for general-purpose embedded design. Its balance of dropout performance, availability, protection features, and low cost is hard to match. In summary, use it for 3.3 V MCU rails, FPGA auxiliaries, RF modules, and mid-resolution ADC references. For battery-critical or high-efficiency applications, however, consider the MCP1700 or a switching regulator instead.<\/p>\n<h2><b><span data-font-family=\"Arial\">Find What You Need on <a href=\"http:\/\/lcsc.com\">LCSC<\/a><\/span><\/b><\/h2>\n<p><span data-font-family=\"default\">Find your AMS1117 voltage regulator on LCSC Electronics.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways: The AMS1117 is a low-dropout (LDO) linear voltage regulator. Output up to 800 mA with 1.1\u20131.3 V dropout from a PNP pass transistor Fixed options from 1.2 V to 5.0 V; adjustable output with two external resistors Requires output capacitor ESR of 0.3\u201322 \u03a9 for stable operation Thermal management is critical at full [&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,"footnotes":""},"categories":[27],"tags":[327,328],"class_list":["post-4062","post","type-post","status-publish","format-standard","hentry","category-electronic-components","tag-ams1117","tag-ams1117-voltage-regulator"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AMS1117 Voltage Regulator Guide - LCSC<\/title>\n<meta name=\"description\" content=\"Learn how the AMS1117 voltage regulator works, its key specs, dropout performance, package options, and how it compares to LM7805 and MCP1700\" \/>\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\/ams1117-voltage-regulator-complete-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AMS1117 Voltage Regulator Guide - LCSC\" \/>\n<meta property=\"og:description\" content=\"Learn how the AMS1117 voltage regulator works, its key specs, dropout performance, package options, and how it compares to LM7805 and MCP1700\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.lcsc.com\/blog\/ams1117-voltage-regulator-complete-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog | LCSC Electronics\" \/>\n<meta property=\"article:published_time\" content=\"2026-06-04T06:02:36+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-04T06:05:21+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=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/ams1117-voltage-regulator-complete-guide\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/ams1117-voltage-regulator-complete-guide\\\/\"},\"author\":{\"name\":\"LCSC Editor\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#\\\/schema\\\/person\\\/11d3b92d0208775e62d7f79a0da4e781\"},\"headline\":\"AMS1117 Voltage Regulator: Specs, Circuits &#038; 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