{"id":35607,"date":"2026-09-09T17:20:57","date_gmt":"2026-09-09T09:20:57","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/?p=35607"},"modified":"2026-09-09T17:21:32","modified_gmt":"2026-09-09T09:21:32","slug":"surface-mount-resistor","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/","title":{"rendered":"Surface Mount Resistor Guide: Sizes, Codes, Types &#038; Values"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/#What_Is_a_Surface_Mount_Resistor\" >What Is a Surface Mount Resistor?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/#What_Are_the_Main_Surface_Mount_Resistor_Types\" >What Are the Main Surface Mount Resistor Types?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/#What_Surface_Mount_Resistor_Sizes_Are_Common\" >What Surface Mount Resistor Sizes Are Common?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/#How_Do_You_Read_Surface_Mount_Resistor_Codes_and_Markings\" >How Do You Read Surface Mount Resistor Codes and Markings?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/#Surface_Mount_Resistor_Values_What_Do_100_101_102_and_103_Mean\" >Surface Mount Resistor Values: What Do 100, 101, 102 and 103 Mean?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/#How_Do_You_Choose_the_Right_Surface_Mount_Resistor_for_a_PCB\" >How Do You Choose the Right Surface Mount Resistor for a PCB?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/#Surface_Mount_Resistor_vs_Through-Hole_Resistor_Which_Should_You_Use\" >Surface Mount Resistor vs Through-Hole Resistor: Which Should You Use?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/#FAQs_About_Surface_Mount_Resistors\" >FAQs About Surface Mount Resistors<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div><p><a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/surface-mount-resistor\/\">A surface mount resistor<\/a> is a compact resistor mounted directly onto PCB pads and assembled using surface mount technology. Common packages range from tiny 01005 and 0201 parts to larger 1206, 2010, and 2512 resistors used where more power or board space is available.<\/p>\n<p>Selecting the right part involves more than resistance value. Engineers also need to consider resistor type, package size, tolerance, power rating, working voltage, TCR, and markings. This guide explains the most common surface mount resistor sizes, types, codes, and values, then shows how to choose one for a PCB.<\/p>\n<figure style=\"max-width:600px;margin:28px auto;\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"750\" class=\"wp-image-35601\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-hero.jpg\" alt=\"Surface mount resistor mounted on a printed circuit board\" style=\"display:block;width:100%;max-width:600px;max-height:400px;height:auto;object-fit:contain;margin:0 auto;\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-hero.jpg 1000w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-hero-300x225.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-hero-768x576.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_a_Surface_Mount_Resistor\"><\/span>What Is a Surface Mount Resistor?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A surface mount resistor is a resistor designed to sit directly on conductive pads on the surface of a PCB. It does not use long leads passing through drilled holes like a through-hole resistor.<\/p>\n<p>Other names commonly used for the same component include:<\/p>\n<ul>\n<li>SMD resistor<\/li>\n<li>chip resistor<\/li>\n<li>surface mount chip resistor<\/li>\n<li>SMT resistor<\/li>\n<\/ul>\n<p>SMD means surface-mount device, while SMT refers to the process used to assemble surface-mount components.<\/p>\n<p>A typical chip resistor contains:<\/p>\n<ul>\n<li>a ceramic substrate<\/li>\n<li>a resistive layer<\/li>\n<li>metal terminal electrodes<\/li>\n<li>a protective coating<\/li>\n<\/ul>\n<p>During <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/automated-pcb-assembly\/\">PCB assembly<\/a>, solder paste is printed on the pads, the resistor is placed by pick-and-place equipment, and the joint is formed during reflow soldering.<\/p>\n<p>The surface mount resistor symbol on a schematic is normally the same standard resistor symbol used for a through-hole part. Its reference designator is usually <code>R<\/code>, such as R1 or R24. Package information such as 0603 or 0805 is defined in the PCB footprint rather than the schematic symbol.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Are_the_Main_Surface_Mount_Resistor_Types\"><\/span>What Are the Main Surface Mount Resistor Types?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The main surface mount resistor types differ in resistive material, precision, temperature stability, current capability, and cost.<\/p>\n<figure style=\"max-width:600px;margin:28px auto;\"><img decoding=\"async\" width=\"1000\" height=\"750\" class=\"wp-image-35602\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-types.jpg\" alt=\"Comparison of thick film, thin film, metal strip, metal foil, wirewound and fusible surface mount resistor types\" loading=\"lazy\" style=\"display:block;width:100%;max-width:600px;max-height:400px;height:auto;object-fit:contain;margin:0 auto;\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-types.jpg 1000w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-types-300x225.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-types-768x576.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<div class=\"table-wrap wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td data-header=\"true\">Type<\/td>\n<td data-header=\"true\">Main Characteristic<\/td>\n<td data-header=\"true\">Common Use<\/td>\n<\/tr>\n<tr>\n<td>Thick film<\/td>\n<td>Cost-effective and widely available<\/td>\n<td>General PCB circuits<\/td>\n<\/tr>\n<tr>\n<td>Thin film<\/td>\n<td>High precision and low TCR<\/td>\n<td>Analog and measurement circuits<\/td>\n<\/tr>\n<tr>\n<td>Metal strip<\/td>\n<td>Very low resistance<\/td>\n<td>Current sensing<\/td>\n<\/tr>\n<tr>\n<td>Metal foil<\/td>\n<td>High stability and accuracy<\/td>\n<td>Precision electronics<\/td>\n<\/tr>\n<tr>\n<td>SMD wirewound<\/td>\n<td>Higher power and pulse capability<\/td>\n<td>Power circuits<\/td>\n<\/tr>\n<tr>\n<td>Fusible<\/td>\n<td>Designed to open under overload<\/td>\n<td>Circuit protection<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><strong>Thick-film resistors<\/strong><\/p>\n<p>These are the standard choice for many PCB designs. They cover a broad resistance range and are readily available in packages such as 0402, 0603, 0805, and 1206.<\/p>\n<p>Typical uses include:<\/p>\n<ul>\n<li>pull-up and pull-down networks<\/li>\n<li>LED current limiting<\/li>\n<li>bias circuits<\/li>\n<li>general signal conditioning<\/li>\n<\/ul>\n<p><strong>Thin-film resistors<\/strong><\/p>\n<p>Thin-film parts are used when tighter tolerance and lower temperature coefficient are required. They are common in:<\/p>\n<ul>\n<li>precision amplifiers<\/li>\n<li>sensor interfaces<\/li>\n<li>measurement circuits<\/li>\n<li>accurate voltage dividers<\/li>\n<\/ul>\n<p><strong>Metal strip resistors<\/strong><\/p>\n<p>Metal strip parts are mainly used for low-resistance current sensing. Values may be measured in milliohms rather than ohms, making them useful in battery systems, power supplies, motor drives, and power converters.<\/p>\n<p>The resistor type should therefore match the electrical requirement. Two resistors with the same resistance and package size can have very different tolerance, TCR, pulse capability, and stability.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_Surface_Mount_Resistor_Sizes_Are_Common\"><\/span>What Surface Mount Resistor Sizes Are Common?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Common surface mount resistor sizes include 0201, 0402, 0603, 0805, 1206, 2010, and 2512. Smaller packages reduce PCB area, while larger packages generally offer higher power capability and easier handling.<\/p>\n<figure style=\"max-width:600px;margin:28px auto;\"><img decoding=\"async\" width=\"1000\" height=\"750\" class=\"wp-image-35603\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-sizes.jpg\" alt=\"Surface mount resistor size comparison from 0201 to 2512 packages\" loading=\"lazy\" style=\"display:block;width:100%;max-width:600px;max-height:400px;height:auto;object-fit:contain;margin:0 auto;\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-sizes.jpg 1000w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-sizes-300x225.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-sizes-768x576.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<div class=\"table-wrap wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td data-header=\"true\">Imperial Size<\/td>\n<td data-header=\"true\">Metric Code<\/td>\n<td data-header=\"true\">Approx. Size (mm)<\/td>\n<td data-header=\"true\">Typical Conventional Power*<\/td>\n<\/tr>\n<tr>\n<td>01005<\/td>\n<td>0402<\/td>\n<td>0.4 \u00d7 0.2<\/td>\n<td>~0.03 W<\/td>\n<\/tr>\n<tr>\n<td>0201<\/td>\n<td>0603<\/td>\n<td>0.6 \u00d7 0.3<\/td>\n<td>~0.05 W<\/td>\n<\/tr>\n<tr>\n<td>0402<\/td>\n<td>1005<\/td>\n<td>1.0 \u00d7 0.5<\/td>\n<td>~0.063 W<\/td>\n<\/tr>\n<tr>\n<td>0603<\/td>\n<td>1608<\/td>\n<td>1.6 \u00d7 0.8<\/td>\n<td>~0.10 W<\/td>\n<\/tr>\n<tr>\n<td>0805<\/td>\n<td>2012<\/td>\n<td>2.0 \u00d7 1.25<\/td>\n<td>~0.125 W<\/td>\n<\/tr>\n<tr>\n<td>1206<\/td>\n<td>3216<\/td>\n<td>3.2 \u00d7 1.6<\/td>\n<td>~0.25 W<\/td>\n<\/tr>\n<tr>\n<td>1210<\/td>\n<td>3225<\/td>\n<td>3.2 \u00d7 2.5<\/td>\n<td>~0.5 W<\/td>\n<\/tr>\n<tr>\n<td>2010<\/td>\n<td>5025<\/td>\n<td>5.0 \u00d7 2.5<\/td>\n<td>~0.75 W<\/td>\n<\/tr>\n<tr>\n<td>2512<\/td>\n<td>6332<\/td>\n<td>6.3 \u00d7 3.2<\/td>\n<td>~1 W<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"note\">*These are common reference ratings rather than universal specifications. The exact rating must be checked in the resistor manufacturer&#8217;s datasheet.<\/p>\n<p>The imperial package code approximately represents component length and width in hundredths of an inch. For example:<\/p>\n<ul>\n<li>0603 \u2248 0.06 \u00d7 0.03 inch<\/li>\n<li>0805 \u2248 0.08 \u00d7 0.05 inch<\/li>\n<li>1206 \u2248 0.12 \u00d7 0.06 inch<\/li>\n<\/ul>\n<p>Metric and imperial codes should not be confused. An imperial 0603 package, for example, corresponds to metric 1608 rather than metric 0603.<\/p>\n<p>Package size also affects manufacturability. Moving from 0805 or 0603 to 0402, 0201, or smaller parts generally requires tighter control of:<\/p>\n<ul>\n<li>PCB pad dimensions<\/li>\n<li>solder paste volume<\/li>\n<li>stencil apertures<\/li>\n<li>placement accuracy<\/li>\n<li>component spacing<\/li>\n<li><a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/08\/smt-aoi\/\">automated optical inspection<\/a><\/li>\n<li>rework<\/li>\n<\/ul>\n<p>The smallest surface mount resistor is therefore not automatically the best choice. Use a smaller package when PCB density requires it, not simply because the package is available.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Do_You_Read_Surface_Mount_Resistor_Codes_and_Markings\"><\/span>How Do You Read Surface Mount Resistor Codes and Markings?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Surface mount resistor markings use numbers and letters to represent resistance because the component body is too small for traditional color bands. The most common surface mount resistor code systems are 3-digit codes, 4-digit codes, R notation, and EIA-96.<\/p>\n<figure style=\"max-width:600px;margin:28px auto;\"><img decoding=\"async\" width=\"1000\" height=\"750\" class=\"wp-image-35604\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-codes-markings.jpg\" alt=\"Surface mount resistor codes and markings showing 3-digit, 4-digit, R notation and EIA-96 examples\" loading=\"lazy\" style=\"display:block;width:100%;max-width:600px;max-height:400px;height:auto;object-fit:contain;margin:0 auto;\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-codes-markings.jpg 1000w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-codes-markings-300x225.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-codes-markings-768x576.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<p><strong>3-digit surface mount resistor code<\/strong><\/p>\n<p>The first two digits are significant figures. The third digit tells you how many zeros to add.<\/p>\n<div class=\"table-wrap wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td data-header=\"true\">Code<\/td>\n<td data-header=\"true\">Calculation<\/td>\n<td data-header=\"true\">Value<\/td>\n<\/tr>\n<tr>\n<td>101<\/td>\n<td>10 \u00d7 10<sup>1<\/sup><\/td>\n<td>100 \u03a9<\/td>\n<\/tr>\n<tr>\n<td>102<\/td>\n<td>10 \u00d7 10<sup>2<\/sup><\/td>\n<td>1 k\u03a9<\/td>\n<\/tr>\n<tr>\n<td>103<\/td>\n<td>10 \u00d7 10<sup>3<\/sup><\/td>\n<td>10 k\u03a9<\/td>\n<\/tr>\n<tr>\n<td>331<\/td>\n<td>33 \u00d7 10<sup>1<\/sup><\/td>\n<td>330 \u03a9<\/td>\n<\/tr>\n<tr>\n<td>472<\/td>\n<td>47 \u00d7 10<sup>2<\/sup><\/td>\n<td>4.7 k\u03a9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><strong>4-digit surface mount resistor code<\/strong><\/p>\n<p>The first three digits are significant figures and the fourth digit is the multiplier.<\/p>\n<p>Examples:<\/p>\n<ul>\n<li><code>1001<\/code> = 100 \u00d7 10<sup>1<\/sup> = 1 k\u03a9<\/li>\n<li><code>4701<\/code> = 470 \u00d7 10<sup>1<\/sup> = 4.7 k\u03a9<\/li>\n<li><code>1002<\/code> = 100 \u00d7 10<sup>2<\/sup> = 10 k\u03a9<\/li>\n<li><code>4702<\/code> = 470 \u00d7 10<sup>2<\/sup> = 47 k\u03a9<\/li>\n<\/ul>\n<p>Four-digit markings are often found on tighter-tolerance resistor series.<\/p>\n<p><strong>R notation<\/strong><\/p>\n<p>For low resistance values, <code>R<\/code> is used as the decimal point.<\/p>\n<p>Examples:<\/p>\n<ul>\n<li><code>R10<\/code> = 0.10 \u03a9<\/li>\n<li><code>R47<\/code> = 0.47 \u03a9<\/li>\n<li><code>2R2<\/code> = 2.2 \u03a9<\/li>\n<li><code>4R7<\/code> = 4.7 \u03a9<\/li>\n<\/ul>\n<p><strong>EIA-96 resistor markings<\/strong><\/p>\n<p>EIA-96 uses two digits followed by a letter. The two-digit number refers to one of 96 standard base values, while the letter gives the multiplier.<\/p>\n<p>Because the number is a lookup code rather than the resistance itself, an EIA-96 surface mount resistor code chart or calculator is usually the quickest way to decode it.<\/p>\n<p><strong>Unmarked surface mount resistors<\/strong><\/p>\n<p>01005, 0201, and some other small resistors may have no readable top marking. Their value should be identified using:<\/p>\n<ul>\n<li>BOM data<\/li>\n<li>manufacturer part number<\/li>\n<li>reel label<\/li>\n<li>assembly records<\/li>\n<li><a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/09\/lcr-meter\/\">resistance measurement<\/a><\/li>\n<\/ul>\n<p>Appearance alone is not enough because different values can use identical packages.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Surface_Mount_Resistor_Values_What_Do_100_101_102_and_103_Mean\"><\/span>Surface Mount Resistor Values: What Do 100, 101, 102 and 103 Mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>For a standard 3-digit surface mount resistor marking, the first two digits give the significant value and the third digit gives the multiplier.<\/p>\n<figure style=\"max-width:600px;margin:28px auto;\"><img decoding=\"async\" width=\"1000\" height=\"750\" class=\"wp-image-35605\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-values.jpg\" alt=\"Common SMD resistor code values including 100, 101, 102, 103 and 331\" loading=\"lazy\" style=\"display:block;width:100%;max-width:600px;max-height:400px;height:auto;object-fit:contain;margin:0 auto;\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-values.jpg 1000w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-values-300x225.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-resistor-values-768x576.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<div class=\"table-wrap wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td data-header=\"true\">Surface Mount Resistor Code<\/td>\n<td data-header=\"true\">Resistance Value<\/td>\n<\/tr>\n<tr>\n<td>100<\/td>\n<td>10 \u03a9<\/td>\n<\/tr>\n<tr>\n<td>101<\/td>\n<td>100 \u03a9<\/td>\n<\/tr>\n<tr>\n<td>102<\/td>\n<td>1 k\u03a9<\/td>\n<\/tr>\n<tr>\n<td>103<\/td>\n<td>10 k\u03a9<\/td>\n<\/tr>\n<tr>\n<td>221<\/td>\n<td>220 \u03a9<\/td>\n<\/tr>\n<tr>\n<td>331<\/td>\n<td>330 \u03a9<\/td>\n<\/tr>\n<tr>\n<td>472<\/td>\n<td>4.7 k\u03a9<\/td>\n<\/tr>\n<tr>\n<td>104<\/td>\n<td>100 k\u03a9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>The code <code>100<\/code> is particularly easy to misread.<\/p>\n<p><code>100<\/code> means:<\/p>\n<p class=\"formula\">10 \u00d7 10<sup>0<\/sup> = 10 \u03a9<\/p>\n<p>It does not normally mean 100 \u03a9.<\/p>\n<p>A 100 ohm surface mount resistor commonly uses the code <code>101<\/code>:<\/p>\n<p class=\"formula\">10 \u00d7 10<sup>1<\/sup> = 100 \u03a9<\/p>\n<p>Other common examples are:<\/p>\n<ul>\n<li><code>102<\/code> surface mount resistor = 1 k\u03a9<\/li>\n<li><code>103<\/code> surface mount resistor = 10 k\u03a9<\/li>\n<li><code>331<\/code> surface mount resistor = 330 \u03a9<\/li>\n<li><code>472<\/code> surface mount resistor = 4.7 k\u03a9<\/li>\n<\/ul>\n<p>For example, a standard 330 ohm 0805 surface mount resistor may carry the marking <code>331<\/code> when that resistor series uses body markings.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Do_You_Choose_the_Right_Surface_Mount_Resistor_for_a_PCB\"><\/span>How Do You Choose the Right Surface Mount Resistor for a PCB?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Choose a surface mount resistor by checking the required resistance first, then tolerance, power, voltage, temperature behavior, pulse load, and package size.<\/p>\n<p>The main specifications are:<\/p>\n<ul>\n<li><strong>Resistance:<\/strong> Match the nominal value required by the circuit.<\/li>\n<li><strong>Tolerance:<\/strong> \u00b15% and \u00b11% are common; precision designs may need \u00b10.5%, \u00b10.1%, or tighter.<\/li>\n<li><strong>Power rating:<\/strong> Calculate actual dissipation and leave suitable operating margin.<\/li>\n<li><strong>Working voltage:<\/strong> Check this separately from wattage, especially in high-voltage circuits.<\/li>\n<li><strong>TCR:<\/strong> Use a lower temperature coefficient when resistance stability over temperature matters.<\/li>\n<li><strong>Pulse rating:<\/strong> Check surge capability for startup, switching, discharge, and transient loads.<\/li>\n<li><strong>Package:<\/strong> Select a size that meets both electrical and PCB space requirements.<\/li>\n<li><strong>Availability:<\/strong> Check whether the exact series is practical to source throughout production.<\/li>\n<\/ul>\n<p>Resistor power can be estimated using:<\/p>\n<p class=\"formula\">P = I<sup>2<\/sup>R<\/p>\n<p class=\"formula\">P = V<sup>2<\/sup> \/ R<\/p>\n<p>Package wattage should not be treated as a universal limit. The usable power also depends on the exact resistor series, ambient temperature, PCB copper area, and manufacturer derating curve.<\/p>\n<p>Package selection also affects assembly. An electrically suitable 0201 resistor may be unnecessary if an 0603 fits comfortably and the product does not require extreme component density.<\/p>\n<p>For production PCBs, the preferred package is usually the smallest size that meets the electrical and layout requirements without adding unnecessary assembly difficulty.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Surface_Mount_Resistor_vs_Through-Hole_Resistor_Which_Should_You_Use\"><\/span>Surface Mount Resistor vs Through-Hole Resistor: Which Should You Use?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The surface mount resistor vs through hole choice depends on assembly method, PCB area, mechanical needs, and power requirements. A surface mount resistor is usually preferred for compact and automated PCB assembly, while a through-hole resistor remains useful when easy manual handling, mechanical retention, or certain high-power requirements matter more.<\/p>\n<figure style=\"max-width:600px;margin:28px auto;\"><img decoding=\"async\" width=\"1000\" height=\"750\" class=\"wp-image-35606\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-vs-through-hole-resistor.jpg\" alt=\"Surface mount resistor versus through-hole resistor comparison on printed circuit boards\" loading=\"lazy\" style=\"display:block;width:100%;max-width:600px;max-height:400px;height:auto;object-fit:contain;margin:0 auto;\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-vs-through-hole-resistor.jpg 1000w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-vs-through-hole-resistor-300x225.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/09\/surface-mount-vs-through-hole-resistor-768x576.jpg 768w\" sizes=\"auto, (max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n<div class=\"table-wrap wp-block-table\">\n<table>\n<tbody>\n<tr>\n<td data-header=\"true\">Factor<\/td>\n<td data-header=\"true\">Surface Mount Resistor<\/td>\n<td data-header=\"true\">Through-Hole Resistor<\/td>\n<\/tr>\n<tr>\n<td>PCB area<\/td>\n<td>Smaller<\/td>\n<td>Larger<\/td>\n<\/tr>\n<tr>\n<td>Automated assembly<\/td>\n<td>Well suited<\/td>\n<td>Less efficient<\/td>\n<\/tr>\n<tr>\n<td>Component density<\/td>\n<td>Higher<\/td>\n<td>Lower<\/td>\n<\/tr>\n<tr>\n<td>Lead inductance<\/td>\n<td>Lower<\/td>\n<td>Higher<\/td>\n<\/tr>\n<tr>\n<td>Manual soldering<\/td>\n<td>More difficult<\/td>\n<td>Easier<\/td>\n<\/tr>\n<tr>\n<td>Mechanical retention<\/td>\n<td>Lower<\/td>\n<td>Stronger<\/td>\n<\/tr>\n<tr>\n<td>Rework<\/td>\n<td>Harder at small sizes<\/td>\n<td>Usually easier<\/td>\n<\/tr>\n<tr>\n<td>High-density PCB<\/td>\n<td>Preferred<\/td>\n<td>Less suitable<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>Choose a surface mount resistor when the design prioritizes:<\/p>\n<ul>\n<li>compact PCB size<\/li>\n<li>automated SMT production<\/li>\n<li>high component density<\/li>\n<li>short electrical paths<\/li>\n<li>double-sided component placement<\/li>\n<\/ul>\n<p>Choose a through-hole resistor when the design benefits more from:<\/p>\n<ul>\n<li>manual assembly<\/li>\n<li>straightforward repair<\/li>\n<li>stronger mechanical retention<\/li>\n<li>large leaded power components<\/li>\n<li>simple prototype construction<\/li>\n<\/ul>\n<p>For most modern volume-produced PCB assemblies, surface mount resistors are the default choice.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs_About_Surface_Mount_Resistors\"><\/span>FAQs About Surface Mount Resistors<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"faq-item\">\n<p><strong>1. What does 102 mean on a surface mount resistor?<\/strong><\/p>\n<p><code>102<\/code> means 1 k\u03a9. The first two digits are 10, and the third digit adds two zeros: 10 \u00d7 100 = 1,000 \u03a9.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<p><strong>2. What does 103 mean on a surface mount resistor?<\/strong><\/p>\n<p><code>103<\/code> means 10 k\u03a9: 10 \u00d7 1,000 = 10,000 \u03a9.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<p><strong>3. Is an 0805 resistor always 1\/8 watt?<\/strong><\/p>\n<p>No. Around 0.125 W is a common conventional rating, but the actual rating depends on the resistor series, construction, temperature, and manufacturer.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<p><strong>4. What is the smallest surface mount resistor size?<\/strong><\/p>\n<p>01005-class and smaller specialized resistors are available. The smallest practical package for a PCB depends on placement capability, stencil printing, inspection, rework, and required production yield.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<p><strong>5. Why do some surface mount resistors have no markings?<\/strong><\/p>\n<p>Small packages may not have enough body area for readable markings. Their resistance should be verified from the BOM, reel label, manufacturer part number, or measurement.<\/p>\n<\/div>\n<div class=\"faq-item\">\n<p><strong>6. Is an SMD resistor the same as an SMT resistor?<\/strong><\/p>\n<p>In everyday use, the terms often refer to the same type of component. Technically, SMD means surface-mount device, while SMT is the manufacturing technology used to assemble it.<\/p>\n<\/div>\n<div class=\"cta\">\n<p>If you are preparing a PCB or PCBA project and need support with component package selection, SMT manufacturability, stencil design, or assembly planning, send your Gerber files, BOM, and assembly requirements to <strong><a href=\"mailto:sales@bestpcbs.com\">sales@bestpcbs.com<\/a><\/strong><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Learn surface mount resistor sizes, types, codes and values. Compare SMD packages, decode 100\/101\/102\/103 markings, and choose the right resistor for a PCB.<\/p>\n","protected":false},"author":623,"featured_media":35601,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[175,7085,7243,17],"tags":[2746,8281,8283,8282,8284],"class_list":["post-35607","post","type-post","status-publish","format-standard","hentry","category-best-pcb","category-electronic-components","category-pcb-assembly-pcba","category-smt-technology","tag-surface-mount-resistor","tag-surface-mount-resistor-code","tag-surface-mount-resistor-markings","tag-surface-mount-resistor-sizes","tag-surface-mount-resistor-vs-through-hole"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Learn surface mount resistor sizes, types, codes and values. 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