{"id":37533,"date":"2026-10-21T15:26:53","date_gmt":"2026-10-21T07:26:53","guid":{"rendered":"https:\/\/www.bestpcbs.com\/blog\/?p=37533"},"modified":"2026-10-21T15:30:51","modified_gmt":"2026-10-21T07:30:51","slug":"thick-film-resistor-tcr","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/thick-film-resistor-tcr\/","title":{"rendered":"Thick Film Resistor TCR: Values, Temperature Drift and Selection"},"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\/10\/thick-film-resistor-tcr\/#What_Does_Thick_Film_Resistor_TCR_Mean\" >What Does Thick Film Resistor TCR Mean?<\/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\/10\/thick-film-resistor-tcr\/#What_TCR_Values_Do_Thick_Film_Resistors_Offer\" >What TCR Values Do Thick Film Resistors Offer?<\/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\/10\/thick-film-resistor-tcr\/#How_Do_You_Calculate_Resistance_Change_from_TCR\" >How Do You Calculate Resistance Change from TCR?<\/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\/10\/thick-film-resistor-tcr\/#How_Do_Self-Heating_and_PCB_Temperature_Affect_Resistance\" >How Do Self-Heating and PCB Temperature Affect Resistance?<\/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\/10\/thick-film-resistor-tcr\/#How_Does_TCR_Affect_Voltage_Dividers_and_Analog_Circuits\" >How Does TCR Affect Voltage Dividers and Analog Circuits?<\/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\/10\/thick-film-resistor-tcr\/#When_Is_a_Lower-TCR_Resistor_Worth_Using\" >When Is a Lower-TCR Resistor Worth Using?<\/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\/10\/thick-film-resistor-tcr\/#FAQs_About_Thick_Film_Resistor_TCR\" >FAQs About Thick Film Resistor TCR<\/a><\/li><\/ul><\/nav><\/div>\n<div class=\"yzp-no-index\"><\/div><p><a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/thick-film-resistor-tcr\/\">Thick film resistor TCR<\/a> describes how much a resistor\u2019s resistance changes with temperature, usually expressed in ppm\/\u00b0C. Understanding common TCR ratings helps you estimate temperature drift and its effect on circuit accuracy. Practical examples show when standard thick film resistors meet your needs and when a lower-TCR option is worth choosing.<\/p>\n<p>At EBest Circuit, we&#8217;ve supported PCB and PCBA projects for customers in the United States, Germany, and Israel, including established medical device brands. Our dedicated engineering and quality management teams help customers turn design requirements into production-ready boards, with practical support when manufacturing challenges arise.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-37530\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR1.jpg\" alt=\"thick film resistor TCR\" width=\"1200\" height=\"800\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR1.jpg 1200w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR1-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR1-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR1-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Thick film chip resistors in carrier tape before PCB assembly.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"What_Does_Thick_Film_Resistor_TCR_Mean\"><\/span>What Does Thick Film Resistor TCR Mean?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>The temperature coefficient of resistance (TCR) describes the relative change in resistance per degree of temperature change.<\/strong> A value of 100 ppm\/\u00b0C corresponds to approximately 0.01% per \u00b0C.<\/p>\n<p>A positive TCR means resistance increases as temperature rises; a negative TCR means it decreases. A datasheet rating of \u00b1100 ppm\/\u00b0C specifies a limit under the stated test conditions. It does not mean that every resistor has an actual coefficient of +100 or \u2212100 ppm\/\u00b0C.<\/p>\n<p><strong>TCR and resistance tolerance describe different sources of error.<\/strong> Tolerance specifies the initial resistance range at a reference condition, while TCR describes temperature-related change. A resistor with tight initial tolerance can still drift noticeably during operation.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_TCR_Values_Do_Thick_Film_Resistors_Offer\"><\/span>What TCR Values Do Thick Film Resistors Offer?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Thick film resistor TCR ratings commonly include \u00b1100 and \u00b1200 ppm\/\u00b0C, while precision series offer options such as \u00b150 or \u00b125 ppm\/\u00b0C.<\/strong> The available rating depends on the specific series, resistance value, package, and temperature range.<\/p>\n<div style=\"overflow-x: auto;\">\n<table style=\"border-collapse: collapse; width: 100%;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">TCR rating<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">Approximate resistance change over 60\u00b0C<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">Selection context<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b1200 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b11.20%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">General-purpose circuits with a relatively wide error allowance<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b1100 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b10.60%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">General-purpose designs requiring less thermal drift<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b150 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b10.30%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Tighter temperature-stability requirements<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b125 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b10.15%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Precision applications where this drift fits the error budget<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p>These figures estimate the temperature contribution alone, assuming the stated coefficient applies across the temperature interval. They exclude initial tolerance and long-term resistance change.<\/p>\n<p><strong>Check the TCR specification for the exact orderable part.<\/strong> A series may specify different limits for different resistance ranges, and low-resistance or very high-resistance values may have wider limits. Also check whether the datasheet specifies separate behavior above and below the reference temperature.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Do_You_Calculate_Resistance_Change_from_TCR\"><\/span>How Do You Calculate Resistance Change from TCR?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Multiply the reference resistance by TCR and the temperature change to estimate resistance drift.<\/strong> <strong><span style=\"color: #0070c0;\">For an approximately constant coefficient:<\/span><\/strong><\/p>\n<p><strong>\u0394R \u2248 Rref \u00d7 \u03b1 \u00d7 \u0394T \u00d7 10\u207b\u2076<\/strong><\/p>\n<p>Here, Rref is resistance at the reference temperature, \u03b1 is TCR in ppm\/\u00b0C, and \u0394T is the resistor\u2019s temperature change in \u00b0C. <strong><span style=\"color: #0070c0;\">The corresponding percentage change is:<\/span><\/strong><\/p>\n<p><strong>Resistance change (%) \u2248 \u03b1 \u00d7 \u0394T \u00f7 10,000<\/strong><\/p>\n<p><strong><span style=\"color: #0070c0;\">For a 10 k\u03a9 resistor warming from 25\u00b0C to 85\u00b0C, \u0394T is 60\u00b0C:<\/span><\/strong><\/p>\n<div style=\"overflow-x: auto;\">\n<table style=\"border-collapse: collapse; width: 100%;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">TCR magnitude used<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">Estimated resistance change<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">Change relative to 10 k\u03a9<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">Estimated resistance range*<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">25 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b115 \u03a9<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b10.15%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">9,985\u201310,015 \u03a9<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">50 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b130 \u03a9<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b10.30%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">9,970\u201310,030 \u03a9<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">100 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b160 \u03a9<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b10.60%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">9,940\u201310,060 \u03a9<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">200 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b1120 \u03a9<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u00b11.20%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">9,880\u201310,120 \u03a9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><em>Assumes exactly 10 k\u03a9 at 25\u00b0C and an applicable \u00b1TCR limit. Initial tolerance, aging, and other effects are excluded.<\/em><\/p>\n<p>A \u00b1100 ppm\/\u00b0C part therefore contributes approximately \u00b10.6% temperature-related resistance change over this interval. If its initial tolerance is \u00b11%, a conservative first-order estimate allows roughly \u00b11.6% combined deviation before other errors are included.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Do_Self-Heating_and_PCB_Temperature_Affect_Resistance\"><\/span>How Do Self-Heating and PCB Temperature Affect Resistance?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>TCR calculations should use the resistor\u2019s operating temperature, not simply the surrounding air temperature.<\/strong> That temperature reflects both heat from the PCB and nearby components and heat generated by the resistor itself.<\/p>\n<p>Resistor power dissipation is <strong>P = I\u00b2R<\/strong>, or <strong>P = V\u00b2\/R<\/strong>. The resulting temperature rise depends on the package, copper layout, mounting conditions, and airflow; it cannot be determined from power alone.<\/p>\n<p>For example, suppose the local ambient temperature is 60\u00b0C, but self-heating raises the resistor to 85\u00b0C. Relative to a 25\u00b0C reference, a 100 ppm\/\u00b0C coefficient gives approximately <strong>0.6% resistance change<\/strong>, rather than the 0.35% estimated from ambient temperature alone.<\/p>\n<p><strong>Operating below the power rating does not guarantee negligible thermal drift.<\/strong> For precision circuits, evaluate temperature under the intended load and PCB conditions, while observing the manufacturer\u2019s power-derating limits.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-37531\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR2.jpg\" alt=\"thick film resistor TCR\" width=\"1200\" height=\"800\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR2.jpg 1200w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR2-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR2-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR2-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Concept illustration: heat leaves the resistor through the surrounding air and PCB.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"How_Does_TCR_Affect_Voltage_Dividers_and_Analog_Circuits\"><\/span>How Does TCR Affect Voltage Dividers and Analog Circuits?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>A voltage divider\u2019s temperature stability depends primarily on how its two resistors change relative to each other.<\/strong> Equal fractional changes cancel in the divider ratio, while unequal changes shift the output.<\/p>\n<p><strong><span style=\"color: #0070c0;\">For an unloaded divider with upper resistor R1 and lower resistor R2:<\/span><\/strong><\/p>\n<p><strong>Vout = Vin \u00d7 R2 \u00f7 (R1 + R2)<\/strong><\/p>\n<p>The following example assumes initially equal resistors, a stable input voltage, and the same 60\u00b0C temperature rise for both resistors. The listed TCRs represent their actual coefficients in this simplified model.<\/p>\n<div style=\"overflow-x: auto;\">\n<table style=\"border-collapse: collapse; width: 100%;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">R1 actual TCR<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">R2 actual TCR<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">R1 change<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">R2 change<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">Output change relative to its initial value<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">+100 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">+100 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">+0.6%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">+0.6%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">0%<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">+100 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u2212100 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">+0.6%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u22120.6%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u22120.6%<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u2212100 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">+100 ppm\/\u00b0C<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">\u22120.6%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">+0.6%<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">+0.6%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><strong>Two resistors carrying the same \u00b1100 ppm\/\u00b0C rating are not guaranteed to track each other.<\/strong> Their actual coefficients may differ. For precision dividers and amplifier gain networks, a specified <strong>TCR tracking<\/strong> or ratio-temperature-coefficient limit is more useful than matching individual TCR ratings alone.<\/p>\n<p>Temperature gradients also matter. Even resistors with identical coefficients change by different amounts if one runs hotter. Keep ratio-critical resistors close together and away from uneven heat sources; consider a resistor network with specified tracking when the accuracy requirement justifies it.<\/p>\n<figure><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-37532\" style=\"max-width: 100%; height: auto;\" src=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR3.jpg\" alt=\"thick film resistor TCR\" width=\"1200\" height=\"800\" srcset=\"https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR3.jpg 1200w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR3-300x200.jpg 300w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR3-1024x683.jpg 1024w, https:\/\/www.bestpcbs.com\/blog\/wp-content\/uploads\/2026\/10\/thick-film-resistor-TCR3-768x512.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption>Concept illustration: uneven heating can cause different resistance changes even when TCR values match.<\/figcaption><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"When_Is_a_Lower-TCR_Resistor_Worth_Using\"><\/span>When Is a Lower-TCR Resistor Worth Using?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Use a lower-TCR resistor when predicted thermal drift exceeds the resistance-related error allowed by the circuit.<\/strong> This is especially relevant to precision sensing, reference scaling, amplifier gain setting, and measurement equipment operating across a wide temperature range.<\/p>\n<p><strong><span style=\"color: #0070c0;\">For example, if a resistor is allowed only 0.2% temperature-related change over an 80\u00b0C interval:<\/span><\/strong><\/p>\n<p><strong>Maximum TCR magnitude \u2248 0.2 \u00d7 10,000 \u00f7 80 = 25 ppm\/\u00b0C<\/strong><\/p>\n<p>A \u00b125 ppm\/\u00b0C resistor uses the entire thermal-drift allowance in this estimate. Select a tighter rating if margin is required. If 0.2% is the total accuracy budget, initial tolerance and other errors must receive part of that budget as well.<\/p>\n<div style=\"overflow-x: auto;\">\n<table style=\"border-collapse: collapse; width: 100%;\">\n<thead>\n<tr>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">Circuit requirement<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">Selection approach<\/th>\n<th style=\"border: 1px solid #b8c4d1; padding: 10px; background: #eef4f8; text-align: left;\">Main consideration<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Pull-ups, logic biasing, and other tolerant functions<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Standard thick film is often sufficient<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Confirm that resistance variation remains within functional limits<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Moderate precision with tighter thermal limits<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Evaluate precision thick film<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Check the exact resistance value and available TCR grade<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Low drift combined with low excess noise<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Compare suitable thin film series<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Check TCR, noise, stability, and operating limits<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Stable divider ratio or amplifier gain<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Evaluate a matched resistor network<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Prioritize specified tracking and similar operating temperatures<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Significant pulse or surge exposure<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Choose a suitably rated series<\/td>\n<td style=\"border: 1px solid #b8c4d1; padding: 10px;\">Low TCR alone does not establish pulse capability<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><strong>Precision <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/thin-film-vs-thick-film-resistor\/\">thick film and thin film<\/a> should be compared at the part level.<\/strong> Thin film often offers lower TCR and lower excess noise, while precision thick film may meet the accuracy requirement without changing resistor technology. For ratio-based circuits, improving tracking can provide more value than reducing each resistor\u2019s individual TCR.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs_About_Thick_Film_Resistor_TCR\"><\/span>FAQs About Thick Film Resistor TCR<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>Can a room-temperature resistance measurement verify TCR?<\/strong><\/p>\n<p>No. It checks resistance at one temperature. Verifying TCR requires measurements at controlled temperatures, with sufficient settling time and low enough measurement power to avoid significant self-heating.<\/p>\n<p><strong>Are ppm\/\u00b0C and ppm\/K equivalent for resistor TCR?<\/strong><\/p>\n<p>Yes. A temperature change of 1\u00b0C equals a change of 1 K, so the numerical coefficient is the same.<\/p>\n<p><strong>Does a zero-ohm jumper have a useful TCR specification?<\/strong><\/p>\n<p>Usually, maximum resistance, current rating, and temperature rise are more useful selection criteria. Follow the jumper\u2019s datasheet rather than treating its nominal zero-ohm value as an ordinary resistor in a TCR calculation.<\/p>\n<p><strong>Does laser trimming guarantee low TCR?<\/strong><\/p>\n<p>No. Laser trimming adjusts resistance toward a target value. It does not, by itself, guarantee a particular temperature coefficient.<\/p>\n<p><strong>Is a negative TCR a sign of a defective resistor?<\/strong><\/p>\n<p>No. A negative coefficient is acceptable when it falls within the manufacturer\u2019s specification. Whether it suits the application depends on the circuit\u2019s temperature behavior.<\/p>\n<p><strong>Can two resistors with the same resistance and TCR rating be substituted directly?<\/strong><\/p>\n<p>Not on those two specifications alone. Also compare tolerance, package, power derating, working voltage, pulse capability, and applicable reliability requirements.<\/p>\n<p>For PCB fabrication and PCBA support for your <a href=\"https:\/\/www.bestpcbs.com\/blog\/2026\/10\/thick-film-resistor-tcr\/\">thick film resistor TCR<\/a> requirements, contact <strong>EBest Circuit<\/strong> at <strong>sales@bestpcbs.com<\/strong> with your project requirements. Our engineering and quality teams can help coordinate manufacturing requirements from prototype through production.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thick film resistor TCR describes how much a resistor\u2019s resistance changes with temperature, usually expressed in ppm\/\u00b0C. Understanding common TCR ratings helps you estimate temperature drift and its effect on circuit accuracy. Practical examples show when standard thick film resistors meet your needs and when a lower-TCR option is worth choosing. At EBest Circuit, we&#8217;ve [&hellip;]<\/p>\n","protected":false},"author":33085,"featured_media":37530,"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":[7085],"tags":[8917,8919,8918],"class_list":["post-37533","post","type-post","status-publish","format-standard","hentry","category-electronic-components","tag-temperature-coefficient-of-resistance","tag-thick-film-resistor-tcr","tag-thick-film-resistors"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Understand thick film resistor TCR, calculate temperature drift, and learn when lower-TCR resistors improve circuit accuracy.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"zeng, liuyan\"\/>\n\t<link rel=\"canonical\" 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