{"id":4208,"date":"2026-06-18T01:42:56","date_gmt":"2026-06-18T01:42:56","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=4208"},"modified":"2026-06-18T01:42:56","modified_gmt":"2026-06-18T01:42:56","slug":"the-0402-resistor-guide-dimensions-footprints-and-soldering-tips","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/the-0402-resistor-guide-dimensions-footprints-and-soldering-tips\/","title":{"rendered":"The 0402 Resistor Guide: Dimensions, Footprints, and Soldering Tips"},"content":{"rendered":"<h2><b><span data-font-family=\"Arial\">Key Takeaways<\/span><\/b><\/h2>\n<ul>\n<li><b><span data-font-family=\"Arial\">Physical reality: <\/span><\/b><span data-font-family=\"Arial\">The 0402 package measures exactly 1.0 mm x 0.5 mm, making it about 75-80% smaller by area than the 0805 package; high-density layouts can use pads as tight as 0.5 mm x 0.5 mm with a 0.2 mm gap, though IPC-7351B&#8217;s Nominal land pattern is somewhat larger (see FAQ for details).<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Tolerance drives placement accuracy: <\/span><\/b><span data-font-family=\"Arial\">Standard 0402 resistors ship with 1% tolerance (E96 series); upgrading to 0.1% adds cost but eliminates the need for post-assembly trimming in precision analog circuits.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Solder paste volume is critical: <\/span><\/b><span data-font-family=\"Arial\">IPC-7351B recommends a stencil aperture reduction of 10-20% for 0402 pads to prevent bridging \u2014 excess paste is the leading cause of 0402 assembly rework.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Power rating is 0.0625 W (1\/16 W) at 70 degrees C: <\/span><\/b><span data-font-family=\"Arial\">Above that temperature, derate linearly to zero watts at 155 degrees C (approximately 0.000735 W\/degrees C) to avoid resistive element degradation.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">What Is a <a href=\"https:\/\/www.lcsc.com\/category\/1199.html?scene=FULL_MATCH&amp;globalKeyword=0402&amp;s_z=n_q_t_0402&amp;spm=wm.ssy.tc.0.tz&amp;lcsc_vid=QFRZXlwAQVcPBAZQFlVaAVUETlgMBlNfElRXBVFWEVIxVlNeRldWV1RVQVJcVDsOAxUeFF5JWBYZEEoKFBINSQcJGk4NBhADEA4cHktXQ1VfSQwSGg0%3D\">0402 Resistor<\/a>?<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">A 0402 resistor is a two-terminal surface-mount <a href=\"https:\/\/www.lcsc.com\/category\/30.html\">passive component<\/a> measuring 1.0 mm x 0.5 mm (imperial code 0402), designed to limit or divide current in a PCB circuit.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Internal Construction and Materials<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The resistive element consists of a ruthenium oxide (RuO2) thick-film paste screen-printed onto a high-purity alumina (Al2O3) ceramic substrate, then laser-trimmed to the target resistance. Terminations are silver-palladium alloy capped with nickel and tin plating for RoHS-compliant soldering. The thin film variant, used for sub-0.1% tolerance parts, deposits tantalum nitride (TaN) by sputtering, achieving sheet resistance uniformity within \u00b15 ppm\/\u00b0C TCR.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Why the 0402 Is Indispensable for Engineers<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The 0402 format has effectively replaced the 0603 and 0805 as the default passive size in RF, mobile, and miniaturized industrial designs. Its compact footprint allows routing density improvements of 30-40% compared to 0603 in equivalent circuit blocks, while the electrical performance \u2014 particularly parasitic inductance below 0.5 nH \u2014 makes it suitable for decoupling and filtering up to several hundred MHz.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">What Are the Key Features and Advantages of 0402 Resistors?<\/span><\/b><\/h2>\n<table style=\"height: 202px;\" width=\"844\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"128.66666666666666\"><b><span data-font-family=\"Arial\">Feature<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"277\"><b><span data-font-family=\"Arial\">Description<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"243.33333333333334\"><b><span data-font-family=\"Arial\">Engineering Benefit<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"128.66666666666666\"><b><span data-font-family=\"Arial\">1.0 mm x 0.5 mm Body<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"277\"><span data-font-family=\"Arial\">EIA 0402 \/ IEC 1005 standard; 0.5 mm x 0.5 mm pad, 0.2 mm inter-pad gap<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"243.33333333333334\"><span data-font-family=\"Arial\">Enables &gt;1,000 component\/cm2 placement density on 4-layer boards<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"128.66666666666666\"><b><span data-font-family=\"Arial\">Low Parasitic Inductance<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"277\"><span data-font-family=\"Arial\">Self-inductance typically 0.4-0.6 nH; body capacitance ~0.05 pF<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"243.33333333333334\"><span data-font-family=\"Arial\">Effective decoupling and EMI filtering remain valid to 500 MHz<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"128.66666666666666\"><b><span data-font-family=\"Arial\">Wide Resistance Range<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"277\"><span data-font-family=\"Arial\">1 ohm to 10 Mohm in E24\/E96 series; 0 ohm jumpers also available<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"243.33333333333334\"><span data-font-family=\"Arial\">Single-package family covers pull-up, pull-down, current sense, and termination roles<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">How Parasitic Inductance Affects High-Frequency Designs<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">At frequencies above 100 MHz, the self-resonant frequency (SRF) of the resistor body becomes a critical parameter. For a 0402 with 0.5 nH inductance and 0.05 pF capacitance, SRF = 1 \/ (2\u03c0 \u00d7 sqrt(<\/span><b><span data-font-family=\"Arial\">L<\/span><\/b><span data-font-family=\"Arial\"> \u00d7 <\/span><b><span data-font-family=\"Arial\">C<\/span><\/b><span data-font-family=\"Arial\">)) \u2248 31.8 GHz. Below SRF, the component behaves resistively; above it, it becomes inductive. This headroom is why the 0402 remains usable well past 500 MHz, but engineers working near or above 20 GHz should still verify the SRF from the manufacturer&#8217;s S-parameter data rather than relying on the nominal resistance value alone, since actual parasitics vary by termination geometry and <a href=\"https:\/\/blogs.lcsc.com\/blog\/pcb-schematic-design-guide\/\">PCB layout.<\/a><\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">What Are the Technical Specifications to Watch?<\/span><\/b><\/h2>\n<table style=\"height: 75px;\" width=\"975\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"145.33333333333334\"><b><span data-font-family=\"Arial\">Parameter<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"140.33333333333334\"><b><span data-font-family=\"Arial\">Thick Film \/ Typical<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"134.33333333333334\"><b><span data-font-family=\"Arial\">Thin Film \/ Typical<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"99.66666666666667\"><b><span data-font-family=\"Arial\">Unit<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"115.33333333333333\"><b><span data-font-family=\"Arial\">Compliance<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"145.33333333333334\"><b><span data-font-family=\"Arial\">Max Voltage (Vmax)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"140.33333333333334\"><span data-font-family=\"Arial\">50<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"134.33333333333334\"><span data-font-family=\"Arial\">50<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"99.66666666666667\"><span data-font-family=\"Arial\">V<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"115.33333333333333\"><span data-font-family=\"Arial\">IEC 60115-1<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"145.33333333333334\"><b><span data-font-family=\"Arial\">Power Rating (70 degrees C)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"140.33333333333334\"><span data-font-family=\"Arial\">0.0625<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"134.33333333333334\"><span data-font-family=\"Arial\">0.0625<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"99.66666666666667\"><span data-font-family=\"Arial\">W<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"115.33333333333333\"><span data-font-family=\"Arial\">IEC 60115-1<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"145.33333333333334\"><b><span data-font-family=\"Arial\">Tolerance<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"140.33333333333334\"><span data-font-family=\"Arial\">1% \/ 5%<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"134.33333333333334\"><span data-font-family=\"Arial\">0.1% \/ 0.5%<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"99.66666666666667\"><span data-font-family=\"Arial\">%<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"115.33333333333333\"><span data-font-family=\"Arial\">EIA-RS-279<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"145.33333333333334\"><b><span data-font-family=\"Arial\">TCR<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"140.33333333333334\"><span data-font-family=\"Arial\">+\/-100 ppm\/degrees C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"134.33333333333334\"><span data-font-family=\"Arial\">+\/-10 to +\/-25 ppm\/degrees C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"99.66666666666667\"><span data-font-family=\"Arial\">ppm\/degrees C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"115.33333333333333\"><span data-font-family=\"Arial\">MIL-STD-202<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"145.33333333333334\"><b><span data-font-family=\"Arial\">Operating Temp Range<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"140.33333333333334\"><span data-font-family=\"Arial\">-55 to +155<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"134.33333333333334\"><span data-font-family=\"Arial\">-55 to +155<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"99.66666666666667\"><span data-font-family=\"Arial\">degrees C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"115.33333333333333\"><span data-font-family=\"Arial\">AEC-Q200 (auto grade)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"145.33333333333334\"><b><span data-font-family=\"Arial\">Insulation Resistance<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"140.33333333333334\"><span data-font-family=\"Arial\">&gt;10 Gohm at 100 V DC<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"134.33333333333334\"><span data-font-family=\"Arial\">&gt;10 Gohm at 100 V DC<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"99.66666666666667\"><span data-font-family=\"Arial\">ohm<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"115.33333333333333\"><span data-font-family=\"Arial\">IEC 60115-1<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"145.33333333333334\"><b><span data-font-family=\"Arial\">RoHS \/ REACH<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"140.33333333333334\"><span data-font-family=\"Arial\">Yes<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"134.33333333333334\"><span data-font-family=\"Arial\">Yes<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"99.66666666666667\"><span data-font-family=\"Arial\">\u2014<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"115.33333333333333\"><span data-font-family=\"Arial\">EU RoHS 2011\/65\/EU<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">How Do These Specifications Affect Real-World Performance?<\/span><\/b><\/h3>\n<ul>\n<li><b><span data-font-family=\"Arial\">Power derating above 70 degrees C: <\/span><\/b><span data-font-family=\"Arial\">The 0.0625 W rating is only valid at 70 degrees C. For a junction operating at 125 degrees C, the available power drops to approximately 0.022 W. Ignoring this derating is the most common cause of 0402 resistor drift and open-circuit failure in automotive underhood applications.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">TCR and precision circuits: <\/span><\/b><span data-font-family=\"Arial\">A 100 ppm\/degrees C TCR on a 10 kohm resistor introduces a 1 kohm\/degrees C drift, which is unacceptable in precision ADC input dividers. In those cases, specifying a thin-film 0402 at 25 ppm\/degrees C TCR is the minimum requirement.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Voltage coefficient: <\/span><\/b><span data-font-family=\"Arial\">Thick-film resistors above 100 kohm exhibit measurable voltage coefficients \u2014 typically -1 to -5 ppm\/V \u2014 due to the nonlinear RuO2 microstructure. For high-impedance sensor front-ends, this nonlinearity must be budgeted into the error analysis.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">What Are the Customization and Configuration Options?<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Package Types and Application Context<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The 0402 is exclusively an <a href=\"https:\/\/blogs.lcsc.com\/blog\/understanding-surface-mount-device-smd-in-modern-electronics\/\">SMD package<\/a>, and as such, it pairs with standard pick-and-place tooling using a 0.3 mm nozzle tip (recommended). Within the 0402 family, however, several key variants exist that change how the part integrates into a design.<\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"Arial\">Standard 0402 (1005 metric): <\/span><\/b><span data-font-family=\"Arial\">0 mm x 0.5 mm body; the default choice for general signal conditioning, pull-up\/pull-down resistors, and current limiting in LED drive circuits. Suitable for wave or reflow soldering above 260 degrees C per JEDEC J-STD-020.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">0402 zero-ohm jumper: <\/span><\/b><span data-font-family=\"Arial\">Used extensively as a board-layer bridge for single-layer routing workarounds and as DNP (do-not-populate) placeholders for field configuration. Rated at 50 mA maximum current.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">0402 current sense resistor: <\/span><\/b><span data-font-family=\"Arial\">Available in values from 0.01 ohm to 1 ohm with 1% tolerance and four-terminal (Kelvin) pad layouts on specialized parts; however, true Kelvin sensing typically migrates to 0603 or larger for lower parasitic resistance error.<\/span><\/li>\n<\/ul>\n<h3><b><span data-font-family=\"Arial\">Material Variants and Packaging for Production<\/span><\/b><\/h3>\n<ul>\n<li><b><span data-font-family=\"Arial\">Thick film vs. thin film: <\/span><\/b><span data-font-family=\"Arial\">Thick film (RuO2) dominates general-purpose use due to lower cost and availability. Thin film (TaN) is mandatory for TCR below 25 pm\/degrees C or tolerance better than 0.5%, as encountered in precision instrumentation and RF attenuators.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">E24 vs. E96 series: <\/span><\/b><span data-font-family=\"Arial\">Standard 0402 resistors are available in E24 (24 values per decade, 5% steps) and E96 (96 values per decade, 1% steps). Selecting the E96 series eliminates the need for resistor networks to hit exact voltage divider ratios.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Temperature grade \u2014 commercial vs. industrial vs. automotive: <\/span><\/b><span data-font-family=\"Arial\">Commercial grade covers -40 degrees C to +85 degrees C; industrial extends to +125 degrees C; AEC-Q200-qualified automotive parts are rated to +155 degrees C with HTOL (High Temperature Operating Life) testing at 1,000 hours minimum.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Tape-and-reel vs. cut tape vs. bulk: <\/span><\/b><span data-font-family=\"Arial\">For SMT production, 7-inch (180 mm) reels hold approximately 10,000 units of 0402 resistors in 8 mm carrier tape. Cut tape is appropriate for prototyping but is incompatible with auto-feeder magazine systems, which require full reel loads.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">How Are 0402 Resistors Used in Real-World Application Scenarios?<\/span><\/b><\/h2>\n<ol>\n<li><b><span data-font-family=\"Arial\">IoT Sensor Node Pull-Up Networks: <\/span><\/b><span data-font-family=\"Arial\">I2C bus pull-up resistors in a 3.3 V IoT node must fit within a 5 mm x 8 mm module; 0402 resistors at 4.7 kohm occupy one-third the board area of 0603 equivalents, allowing dual-bus configurations within the same footprint.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Automotive ADAS Camera Module Termination: <\/span><\/b><span data-font-family=\"Arial\">LVDS differential pairs in forward-facing camera front-ends require 100 ohm termination resistors with TCR below 50 ppm\/degrees C to maintain impedance matching over the -40 degrees C to +105 degrees C underdash temperature range \u2014 an AEC-Q200 Grade 1 0402 thin film fulfils this requirement directly.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">RF Attenuator Pi-Networks for 5G mmWave Front-End Modules: <\/span><\/b><span data-font-family=\"Arial\">At 28 GHz, the compact 0402 body minimises parasitic shunt capacitance to under 0.05 pF, preserving the attenuator&#8217;s insertion loss flatness within +\/-0.5 dB across the 24-29 GHz band, which 0603 packages cannot achieve due to their higher distributed capacitance.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Medical Wearable Biopotential Front-End Bias Resistors: <\/span><\/b><span data-font-family=\"Arial\">ECG lead-off detection circuits require precision 10 Mohm bias resistors with low current noise; thin-film 0402 parts at 0.1% tolerance deliver the bias stability needed to detect sub-millivolt biopotential signals without introducing 1\/f noise above the Johnson noise floor.<\/span><\/li>\n<\/ol>\n<h2><b><span data-font-family=\"Arial\">Find Your 0402 Resistor on <a href=\"https:\/\/www.lcsc.com\/\">LCSC<\/a><\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">LCSC stocks thousands of 0402 resistor variants from leading manufacturers, including Yageo, Vishay, and Susumu, as well as competitively priced Asian brands such as UniOhm, FH (Fenghua), and CRGP, covering thick-film general-purpose parts through to AEC-Q200 automotive thin-film series.<\/span><\/p>\n<p><span data-font-family=\"Arial\">When sourcing on LCSC, use the following filters to narrow to the right part quickly:<\/span><\/p>\n<ul>\n<li><b><span data-font-family=\"Arial\">Resistance value + tolerance: <\/span><\/b><span data-font-family=\"Arial\">Filter to E96 series (1%) for general analog design; select 0.1% or 0.5% for precision applications.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">TCR range: <\/span><\/b><span data-font-family=\"Arial\">Set maximum TCR to 100 ppm\/degrees C for standard use, or 25 ppm\/degrees C for precision\/RF work.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">AEC-Q200 certification filter: <\/span><\/b><span data-font-family=\"Arial\">Apply when designing for automotive or extended industrial temperature ranges to ensure HTOL and humidity test compliance.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Packaging type: <\/span><\/b><span data-font-family=\"Arial\">Select Tape &amp; Reel (7-inch reel, 10K units) for production, or Cut Tape for prototyping and small-batch runs.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">How Do Thick-Film and Thin-Film 0402 Resistors Compare?<\/span><\/b><\/h2>\n<table style=\"height: 205px;\" width=\"827\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"105\"><b><span data-font-family=\"Arial\">Attribute<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"148\"><b><span data-font-family=\"Arial\">Thick Film (RuO2)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"159\"><b><span data-font-family=\"Arial\">Thin Film (TaN)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><b><span data-font-family=\"Arial\">Best For<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"105\"><b><span data-font-family=\"Arial\">Tolerance<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"148\"><span data-font-family=\"Arial\">1% to 5%<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"159\"><span data-font-family=\"Arial\">0.1% to 0.5%<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">Thin film for precision ADC dividers, RF attenuators<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"105\"><b><span data-font-family=\"Arial\">TCR<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"148\"><span data-font-family=\"Arial\">+\/-100 ppm\/degrees C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"159\"><span data-font-family=\"Arial\">+\/-10 to +\/-25 ppm\/degrees C<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">Thin film where temp stability matters above 50 degrees C<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"105\"><b><span data-font-family=\"Arial\">Unit Cost (typical)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"148\"><span data-font-family=\"Arial\">USD 0.001 to USD 0.005<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"159\"><span data-font-family=\"Arial\">USD 0.02 to USD 0.15<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">Thick film for cost-optimised high-volume designs<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"105\"><b><span data-font-family=\"Arial\">Noise Performance<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"148\"><span data-font-family=\"Arial\">-10 to 0 dBuV excess noise<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"159\"><span data-font-family=\"Arial\">-30 to -20 dBuV excess noise<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">Thin film for low-noise sensor front-ends<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b><span data-font-family=\"Arial\">Quick Selection Guide<\/span><\/b><\/h3>\n<ul>\n<li><b><span data-font-family=\"Arial\">General pull, LED current limit, decoupling? <\/span><\/b><span data-font-family=\"Arial\">\u2192 Thick film, E24\/E96, 1%, 100 ppm\/degrees C; cost-optimal choice.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Precision voltage divider for ADC reference? <\/span><\/b><span data-font-family=\"Arial\">\u2192 Thin film, 0.1% tolerance, 25 ppm\/degrees C TCR; use matched-pair resistors from the same reel for best tracking.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">RF Pi-attenuator above 1 GHz? <\/span><\/b><span data-font-family=\"Arial\">\u2192 Thin film 0402; verify SRF and S-parameters from the manufacturer&#8217;s data sheet.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Automotive underhood or industrial up to +125 degrees C? <\/span><\/b><span data-font-family=\"Arial\">\u2192 AEC-Q200 Grade 1 rated part; confirm HTOL test data in the product qualification report.<\/span><\/li>\n<li><b><span data-font-family=\"Arial\">Ultra-high resistance above 1 Mohm in a humid environment? <\/span><\/b><span data-font-family=\"Arial\">\u2192 Thick film with conformal coating on the PCB; verify resistance stability under 85 degrees C \/ 85% RH per IEC 60068-2-67.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">Conclusion: Choosing the Right 0402 Resistor for Your Design<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">The fundamental trade-off with 0402 resistors is between assembly yield and board density: the package delivers substantial routing efficiency gains, but demands tighter solder paste control, finer stencil apertures, and higher pick-and-place accuracy than 0603 or 0805. The practical decision threshold is straightforward \u2014 if your board pitch and component density require 0402, validate your stencil design against IPC-7525 and confirm your placement machine&#8217;s Cpk specification for 0.5 mm-pitch components. <\/span><\/p>\n<p><span data-font-family=\"Arial\">When the choice between thick and thin film is not immediately obvious, weigh three factors: required TCR over the full operating temperature range, allowable tolerance stack in the signal chain, and unit cost sensitivity at production volume. The governing principle to carry forward is this: at 0402, electrical parasitics and mechanical tolerances are tightly coupled \u2014 a 10-degree C ambient increase at maximum load can consume 30% of your power budget headroom, while a 0.05 mm pad misregistration can shift the effective resistance by the equivalent of half a tolerance grade.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Frequently Asked Questions<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Q: How much should I derate the 0402 resistor power rating at elevated ambient temperatures?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">A: The standard IEC 60115-1 derating curve begins at 70 degrees C for a 0402 rated at 0.0625 W. Above that point, derate linearly to zero watts at 155 degrees C. For example, at 105 degrees C, the allowable dissipation falls to approximately 0.036 W. Always confirm the specific derating curve in the manufacturer&#8217;s data sheet, as some vendors start derating at 85 degrees C.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: What PCB pad dimensions does <a href=\"https:\/\/www.electronics.org\/TOC\/IPC-7351B.pdf\">IPC-7351B<\/a> specify for 0402 reflow soldering?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">A: IPC-7351B Land Pattern Standard, Nominal (Level B) density, specifies a pad size of approximately 0.6 mm (length) x 0.5 mm (width) per pad, with roughly a 0.4 mm gap between pads, for a nominal courtyard in the range of 1.5 mm x 0.8 mm. Exact figures vary slightly by CAD library vendor, so always cross-check against the manufacturer&#8217;s recommended land pattern before finalizing. For wave-solder compatibility, pad length is extended by 0.3-0.5 mm on the trailing edge to manage solder shadowing, though 0402 in wave soldering is generally discouraged in favour of selective soldering.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: Can I substitute a 0402 thick-film resistor with a thin-film part without PCB changes?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">A: Yes, provided the package dimensions and termination metallurgy are identical. However, verify that the thin-film part&#8217;s maximum operating voltage matches the application \u2014 some thin-film 0402 resistors have a lower maximum working voltage (typically 25 V versus 50 V for thick film) due to the thinner dielectric layers. Always cross-reference the part&#8217;s qualification standard and temperature grade, not just the resistance value.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: What stencil thickness and aperture reduction should I use for 0402 paste printing?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">A: A 0.12 mm (120 \u00b5m) stainless steel stencil is standard for boards with mixed 0402 and larger components. Apply a 10-20% aperture area reduction on 0402 pads relative to the IPC-7351B land pattern to compensate for paste volume excess at small aperture-to-thickness ratios below 0.66 (area ratio rule). Electroformed nickel stencils with trapezoidal aperture walls further improve paste release by 15-20% compared to laser-cut stainless steel.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Q: How do I select the correct 0402 resistor for an I2C pull-up in a 3.3 V, 400 kHz Fast Mode system?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">A: For a 400 kHz Fast Mode I2C bus at 3.3 V with a target rise time of 100 ns and bus capacitance of 50 pF, the minimum pull-up resistance is R = t_rise \/ (0.8473 x C_bus) = 100 ns \/ (0.8473 x 50 pF) = approximately 2.36 kohm. A standard E96 value of 2.37 kohm at 1% tolerance is the correct selection. Choose a 4.7 kohm part only if bus capacitance is below 25 pF, as higher values extend the rise time beyond the 300 ns Fast Mode maximum and cause data errors at elevated temperatures where leakage increases.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways Physical reality: The 0402 package measures exactly 1.0 mm x 0.5 mm, making it about 75-80% smaller by area than the 0805 package; high-density layouts can use pads as tight as 0.5 mm x 0.5 mm with a 0.2 mm gap, though IPC-7351B&#8217;s Nominal land pattern is somewhat larger (see FAQ for details). [&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,"iawp_total_views":0,"footnotes":""},"categories":[27],"tags":[377,289,130],"class_list":["post-4208","post","type-post","status-publish","format-standard","hentry","category-electronic-components","tag-377","tag-electronic-components","tag-resistor"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>0402 Resistor Guide: Size, Specs and PCB Design Tips- LCSC<\/title>\n<meta name=\"description\" content=\"Explore 0402 resistor dimensions footprints soldering tolerances and PCB layout tips for high-density SMD designs.\" \/>\n<meta name=\"robots\" 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