{"id":1450,"date":"2025-04-14T14:20:00","date_gmt":"2025-04-14T06:20:00","guid":{"rendered":"https:\/\/topfastpcba.com\/?p=1450"},"modified":"2025-10-22T17:23:15","modified_gmt":"2025-10-22T09:23:15","slug":"circuit-board-resistors","status":"publish","type":"post","link":"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/","title":{"rendered":"Resistores de placa de circuito"},"content":{"rendered":"<p><strong>Resistores<\/strong> (comumente chamados simplesmente de \"resistores\" no uso di\u00e1rio) s\u00e3o componentes limitadores de corrente. Quando conectado em um circuito, um resistor normalmente tem um valor de resist\u00eancia fixo com dois pinos que restringem o fluxo de corrente em seu ramo conectado. Os resistores com valores de resist\u00eancia imut\u00e1veis s\u00e3o chamados de <strong>resistores fixos<\/strong>enquanto aqueles com resist\u00eancia ajust\u00e1vel s\u00e3o chamados de <strong>potenci\u00f4metros<\/strong> or <strong>resistores vari\u00e1veis<\/strong>. Um resistor ideal \u00e9 linear, o que significa que a corrente instant\u00e2nea \u00e9 diretamente proporcional \u00e0 tens\u00e3o instant\u00e2nea aplicada. Os resistores vari\u00e1veis usados para divis\u00e3o de tens\u00e3o apresentam um ou dois contatos met\u00e1licos m\u00f3veis pressionados contra um elemento resistivo exposto, em que a posi\u00e7\u00e3o do contato determina a resist\u00eancia entre uma das extremidades do elemento resistivo e o contato.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_75 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><\/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:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#Working_Principle_of_PCB_Resistors\" >Princ\u00edpio de funcionamento dos resistores de PCB<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#Resistor_Materials\" >Materiais do resistor<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#Classification_by_Material\" >Classifica\u00e7\u00e3o por material<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#Resistor_Markings\" >Marca\u00e7\u00f5es do resistor<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#Resistance_Value_and_Tolerance_Marking_Methods\" >M\u00e9todos de marca\u00e7\u00e3o de valor de resist\u00eancia e toler\u00e2ncia<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#1_Direct_Marking_Method\" >1. M\u00e9todo de marca\u00e7\u00e3o direta<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#2_Color_Coding_Method\" >2.M\u00e9todo de codifica\u00e7\u00e3o de cores<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#4-Band_Resistor_Identification\" >Identifica\u00e7\u00e3o do resistor de 4 bandas<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#5-Band_Resistor_Identification\" >Identifica\u00e7\u00e3o do resistor de 5 bandas<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#How_to_Use_the_Tables\" >Como usar as tabelas<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#For_4-band_resistors\" >Para resistores de 4 bandas:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#For_5-band_resistors\" >Para resistores de 5 bandas:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#Tolerance_Definition\" >Defini\u00e7\u00e3o de toler\u00e2ncia<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#Selection_of_PCB_Resistors\" >Sele\u00e7\u00e3o de resistores de PCB<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#1_Selection_of_Fixed_Resistors\" >1. Sele\u00e7\u00e3o de resistores fixos<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#2_Fusible_Resistors\" >2.Resistores fus\u00edveis<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#Three_Fundamental_Selection_Principles\" >Tr\u00eas princ\u00edpios fundamentais de sele\u00e7\u00e3o<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#Major_Resistor_Brands\" >Principais marcas de resistores<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#PCB_Resistor_Soldering_Guidelines\" >Diretrizes de soldagem de resistores de PCB<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#1_Temperature_Control\" >1. Controle de temperatura<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#2_Soldering_Duration\" >2.Dura\u00e7\u00e3o da solda<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#3_Placement\" >3.Coloca\u00e7\u00e3o<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#4_Soldering_Methods\" >4.M\u00e9todos de solda<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/#5_Additional_Checks\" >5.Verifica\u00e7\u00f5es adicionais<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Working_Principle_of_PCB_Resistors\"><\/span><strong>Princ\u00edpio de funcionamento dos resistores de PCB<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Os resistores nas placas de circuito impresso funcionam impedindo o fluxo de corrente por meio de seu material resistivo interno, limitando assim a corrente.Sua opera\u00e7\u00e3o \u00e9 baseada em <strong>Lei de Ohm&amp;#8217<\/strong>: V = I \u00d7 R, where V is voltage, I is current, and R is resistance. A resistor&#8217;s fixed value is typically connected to the circuit through two pins to regulate current flow. The resistance value depends on factors including temperature, material, length, and cross-sectional area. The <strong>coeficiente de temperatura<\/strong> quantifies resistance variation per 1\u00b0C temperature change, expressed as a percentage. A key characteristic of resistors is their ability to convert electrical energy into heat, making them energy-dissipating components. In circuits, resistors primarily serve voltage division and current splitting functions and can work with both AC and DC signals.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Resistor_Materials\"><\/span><strong>Materiais do resistor<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Os resistores s\u00e3o feitos principalmente de materiais resistivos, com tipos comuns que incluem filme de carbono, filme de metal, composi\u00e7\u00e3o s\u00f3lida e enrolamento de fio. As diferentes propriedades desses materiais determinam o desempenho e as aplica\u00e7\u00f5es do resistor. Por exemplo:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Resistores de filme de carbono<\/strong> s\u00e3o amplamente utilizados devido ao seu baixo custo e boa estabilidade<\/li>\n\n\n\n<li><strong>Resistores de filme met\u00e1lico<\/strong> s\u00e3o preferidos em circuitos de alto desempenho por sua estabilidade superior e caracter\u00edsticas de baixo ru\u00eddo<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Classification_by_Material\"><\/span><strong>Classifica\u00e7\u00e3o por material<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Resistores de fio enrolado<\/strong>: Fabricado por meio do enrolamento de um fio de liga de alta resist\u00eancia em torno de um n\u00facleo isolante, revestido com esmalte resistente ao calor ou tinta isolante. Apresenta coeficiente de baixa temperatura, alta precis\u00e3o, boa estabilidade e resist\u00eancia ao calor\/corros\u00e3o. Usado principalmente para aplica\u00e7\u00f5es de alta pot\u00eancia de precis\u00e3o, embora com desempenho ruim em alta frequ\u00eancia e grande constante de tempo.<\/li>\n\n\n\n<li><strong>Resistores de composi\u00e7\u00e3o de carbono<\/strong>: Formado pela compress\u00e3o de carbono e pl\u00e1stico sint\u00e9tico.<\/li>\n\n\n\n<li><strong>Resistores de filme de carbono<\/strong>Criado pelo dep\u00f3sito de carbono cristalino em hastes de cer\u00e2mica. Oferecem baixo custo, desempenho est\u00e1vel, ampla faixa de resist\u00eancia e baixos coeficientes de temperatura\/tens\u00e3o, o que os torna o tipo de resistor mais amplamente usado.<\/li>\n\n\n\n<li><strong>Resistores de filme met\u00e1lico<\/strong>Produzidos pela deposi\u00e7\u00e3o a v\u00e1cuo de materiais de liga em hastes de cer\u00e2mica.Oferecem maior precis\u00e3o, melhor estabilidade, menor ru\u00eddo e coeficientes de temperatura menores do que os resistores de filme de carbono, o que os torna comuns em equipamentos de instrumenta\u00e7\u00e3o e comunica\u00e7\u00e3o.<\/li>\n\n\n\n<li><strong>Resistores de filme de \u00f3xido met\u00e1lico<\/strong>: Formado pelo dep\u00f3sito de \u00f3xidos met\u00e1licos (como \u00f3xido de estanho) em hastes isolantes. Por serem \u00f3xidos, oferecem excelente estabilidade em altas temperaturas, resist\u00eancia a choques t\u00e9rmicos e grande capacidade de carga.<\/li>\n<\/ol>\n\n\n\n<p>Por aplica\u00e7\u00e3o, os resistores podem ser categorizados como de uso geral, de precis\u00e3o, de alta frequ\u00eancia, de alta tens\u00e3o, de alta resist\u00eancia, de alta pot\u00eancia e de redes de resistores.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"850\" height=\"780\" src=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Resistor-Symbols.jpg\" alt=\"\" class=\"wp-image-1451\" srcset=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Resistor-Symbols.jpg 850w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Resistor-Symbols-300x275.jpg 300w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Resistor-Symbols-768x705.jpg 768w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Resistor-Symbols-150x138.jpg 150w\" sizes=\"auto, (max-width: 850px) 100vw, 850px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Resistor_Markings\"><\/span><strong>Marca\u00e7\u00f5es do resistor<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>The nominal resistance value is marked on resistors using numbers or color codes, with units of ohms (\u03a9), kilohms (k\u03a9), megohms (M\u03a9), or teraohms (T\u03a9). Resistance values follow standardized preferred number series corresponding to tolerance ratings.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Resistance_Value_and_Tolerance_Marking_Methods\"><\/span><strong>M\u00e9todos de marca\u00e7\u00e3o de valor de resist\u00eancia e toler\u00e2ncia<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Existem tr\u00eas m\u00e9todos principais de marca\u00e7\u00e3o:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Marca\u00e7\u00e3o direta<\/li>\n\n\n\n<li>C\u00f3digo de cores<\/li>\n\n\n\n<li>Codifica\u00e7\u00e3o de s\u00edmbolos alfanum\u00e9ricos<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Direct_Marking_Method\"><\/span>1. M\u00e9todo de marca\u00e7\u00e3o direta<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Exemplo de marca\u00e7\u00e3o<\/th><th>Valor da resist\u00eancia<\/th><th>Toler\u00e2ncia<\/th><\/tr><\/thead><tbody><tr><td>3\u03a93 \u2160<\/td><td>3.3 \u03a9<\/td><td>\u00b15%<\/td><\/tr><tr><td>1K8<\/td><td>1.8 k\u03a9<\/td><td>\u00b120%<\/td><\/tr><tr><td>5M1 \u2161<\/td><td>5.1 M\u03a9<\/td><td>\u00b110%<\/td><\/tr><tr><td><em>Note: Unmarked resistors default to \u00b120% tolerance<\/em><\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Color_Coding_Method\"><\/span>2.M\u00e9todo de codifica\u00e7\u00e3o de cores<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4-Band_Resistor_Identification\"><\/span>Identifica\u00e7\u00e3o do resistor de 4 bandas<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Cor<\/th><th>1\u00ba d\u00edgito<\/th><th>2\u00ba d\u00edgito<\/th><th>Multiplicador<\/th><th>Toler\u00e2ncia<\/th><\/tr><\/thead><tbody><tr><td>Preto<\/td><td>0<\/td><td>0<\/td><td>10\u2070<\/td><td>\u2014<\/td><\/tr><tr><td>Marrom<\/td><td>1<\/td><td>1<\/td><td>10\u00b9<\/td><td>\u2014<\/td><\/tr><tr><td>Vermelho<\/td><td>2<\/td><td>2<\/td><td>10\u00b2<\/td><td>\u2014<\/td><\/tr><tr><td>Laranja<\/td><td>3<\/td><td>3<\/td><td>10\u00b3<\/td><td>\u2014<\/td><\/tr><tr><td>Amarelo<\/td><td>4<\/td><td>4<\/td><td>10\u2074<\/td><td>\u2014<\/td><\/tr><tr><td>Verde<\/td><td>5<\/td><td>5<\/td><td>10\u2075<\/td><td>\u2014<\/td><\/tr><tr><td>Azul<\/td><td>6<\/td><td>6<\/td><td>10\u2076<\/td><td>\u2014<\/td><\/tr><tr><td>Violeta<\/td><td>7<\/td><td>7<\/td><td>10\u2077<\/td><td>\u2014<\/td><\/tr><tr><td>Cinza<\/td><td>8<\/td><td>8<\/td><td>10\u2078<\/td><td>\u2014<\/td><\/tr><tr><td>Branco<\/td><td>9<\/td><td>9<\/td><td>10\u2079<\/td><td>\u2014<\/td><\/tr><tr><td>Ouro<\/td><td>\u2014<\/td><td>\u2014<\/td><td>10\u207b\u00b9<\/td><td>\u00b15%<\/td><\/tr><tr><td>Prata<\/td><td>\u2014<\/td><td>\u2014<\/td><td>10\u207b\u00b2<\/td><td>\u00b110%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5-Band_Resistor_Identification\"><\/span>Identifica\u00e7\u00e3o do resistor de 5 bandas<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Cor<\/th><th>1\u00ba d\u00edgito<\/th><th>2\u00ba d\u00edgito<\/th><th>3\u00ba d\u00edgito<\/th><th>Multiplicador<\/th><th>Toler\u00e2ncia<\/th><\/tr><\/thead><tbody><tr><td>Preto<\/td><td>0<\/td><td>0<\/td><td>0<\/td><td>10\u2070<\/td><td>\u2014<\/td><\/tr><tr><td>Marrom<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>10\u00b9<\/td><td>\u00b11%<\/td><\/tr><tr><td>Vermelho<\/td><td>2<\/td><td>2<\/td><td>2<\/td><td>10\u00b2<\/td><td>\u00b12%<\/td><\/tr><tr><td>Laranja<\/td><td>3<\/td><td>3<\/td><td>3<\/td><td>10\u00b3<\/td><td>\u2014<\/td><\/tr><tr><td>Amarelo<\/td><td>4<\/td><td>4<\/td><td>4<\/td><td>10\u2074<\/td><td>\u2014<\/td><\/tr><tr><td>Verde<\/td><td>5<\/td><td>5<\/td><td>5<\/td><td>10\u2075<\/td><td>\u00b10.5%<\/td><\/tr><tr><td>Azul<\/td><td>6<\/td><td>6<\/td><td>6<\/td><td>10\u2076<\/td><td>\u00b10.25%<\/td><\/tr><tr><td>Violeta<\/td><td>7<\/td><td>7<\/td><td>7<\/td><td>10\u2077<\/td><td>\u00b10.1%<\/td><\/tr><tr><td>Cinza<\/td><td>8<\/td><td>8<\/td><td>8<\/td><td>10\u2078<\/td><td>\u00b10.05%<\/td><\/tr><tr><td>Branco<\/td><td>9<\/td><td>9<\/td><td>9<\/td><td>10\u2079<\/td><td>\u2014<\/td><\/tr><tr><td>Ouro<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><td>10\u207b\u00b9<\/td><td>\u00b15%<\/td><\/tr><tr><td>Prata<\/td><td>\u2014<\/td><td>\u2014<\/td><td>\u2014<\/td><td>10\u207b\u00b2<\/td><td>\u00b110%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Use_the_Tables\"><\/span>Como usar as tabelas<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"858\" height=\"504\" src=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/5-Color-Ring-Resistors.jpg\" alt=\"\" class=\"wp-image-1452\" srcset=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/5-Color-Ring-Resistors.jpg 858w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/5-Color-Ring-Resistors-300x176.jpg 300w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/5-Color-Ring-Resistors-768x451.jpg 768w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/5-Color-Ring-Resistors-390x228.jpg 390w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/5-Color-Ring-Resistors-150x88.jpg 150w\" sizes=\"auto, (max-width: 858px) 100vw, 858px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"For_4-band_resistors\"><\/span>Para resistores de 4 bandas:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>1\u00aa banda (d\u00edgito das dezenas)<\/strong>: Cor = Vermelho (2)<\/li>\n\n\n\n<li><strong>2\u00aa banda (d\u00edgito das unidades)<\/strong>: Cor = Laranja (3)<\/li>\n\n\n\n<li><strong>Multiplicador<\/strong>: Color = Black (10\u2070)<\/li>\n\n\n\n<li><strong>Toler\u00e2ncia<\/strong>: Color = Gold (\u00b15%)<br><strong>Exemplo<\/strong>:<br>Red-Orange-Black-Gold = 23 \u00d7 10\u2070 = <strong>23\u03a9 (\u00b15%)<\/strong><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"For_5-band_resistors\"><\/span>Para resistores de 5 bandas:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>1\u00aa banda (d\u00edgito das centenas)<\/strong>: Cor = Vermelho (2)<\/li>\n\n\n\n<li><strong>2\u00aa banda (d\u00edgito das dezenas)<\/strong>: Cor = Azul (6)<\/li>\n\n\n\n<li><strong>3\u00aa banda (d\u00edgito das unidades)<\/strong>: Cor = Verde (5)<\/li>\n\n\n\n<li><strong>Multiplicador<\/strong>: Color = Black (10\u2070)<\/li>\n\n\n\n<li><strong>Toler\u00e2ncia<\/strong>: Color = Brown (\u00b11%)<br><strong>Exemplo<\/strong>:<br>Red-Blue-Green-Black-Brown = 265 \u00d7 10\u2070 = <strong>265\u03a9 (\u00b11%)<\/strong><\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Tolerance_Definition\"><\/span>Defini\u00e7\u00e3o de toler\u00e2ncia<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A toler\u00e2ncia representa a <strong>desvio m\u00e1ximo permitido<\/strong> entre o valor real da resist\u00eancia e o valor nominal, expresso como uma porcentagem. Os graus de toler\u00e2ncia comuns incluem:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Standard: \u00b15%, \u00b110%, \u00b120%<\/li>\n\n\n\n<li>Precision: &lt;\u00b11%<\/li>\n\n\n\n<li>High-precision: Up to \u00b10.001%<\/li>\n<\/ul>\n\n\n\n<p><strong>Observa\u00e7\u00e3o<\/strong>:A precis\u00e3o \u00e9 determinada tanto pela toler\u00e2ncia quanto pelas altera\u00e7\u00f5es irrevers\u00edveis na resist\u00eancia.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Selection_of_PCB_Resistors\"><\/span>Sele\u00e7\u00e3o de resistores de PCB<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Selection_of_Fixed_Resistors\"><\/span>1. Sele\u00e7\u00e3o de resistores fixos<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>A escolha do material e da constru\u00e7\u00e3o do resistor deve se basear nos requisitos espec\u00edficos do circuito de aplica\u00e7\u00e3o:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Circuitos de alta frequ\u00eancia<\/strong>: Use resistores n\u00e3o enrolados em fio com baixa indut\u00e2ncia e capacit\u00e2ncia distribu\u00eddas, como <strong>resistores revestidos com filme de carbono, filme de metal, filme de \u00f3xido de metal, filme fino, filme espesso, liga ou anticorros\u00e3o<\/strong>.<\/li>\n\n\n\n<li><strong>Amplificadores de pequenos sinais de alto ganho<\/strong>: Optar por <strong>resistores de baixo ru\u00eddo<\/strong> (por exemplo, filme met\u00e1lico, filme de carbono ou resistores enrolados em fio). Evite <strong>composi\u00e7\u00e3o de carbono e resistores s\u00f3lidos org\u00e2nicos<\/strong>que apresentam maior ru\u00eddo.<\/li>\n<\/ul>\n\n\n\n<p><strong>Principais considera\u00e7\u00f5es:<\/strong><br>\u2714 Select standard-series resistors with values closest to the calculated circuit requirement.<br>\u2714 General circuits: <strong>\u00b15% to \u00b110% tolerance<\/strong> \u00e9 aceit\u00e1vel.<br>\u2714 Precision instruments\/special circuits: Use <strong>resistores de alta precis\u00e3o<\/strong> (por exemplo, 0,01%, 0,1% ou 0,5% de toler\u00e2ncia, como <em>Resistores Jebsen<\/em>).<br>\u2714 <strong>Classifica\u00e7\u00e3o de pot\u00eancia<\/strong> must match circuit demands\u2014avoid arbitrarily increasing\/decreasing wattage.<br>\u2714 For power resistors: Choose a rating <strong>1\u20132\u00d7 higher<\/strong> do que o requisito real do circuito.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Fusible_Resistors\"><\/span>2.Resistores fus\u00edveis<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>Eles funcionam como <strong>componentes de prote\u00e7\u00e3o<\/strong>. A sele\u00e7\u00e3o requer equil\u00edbrio:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Opera\u00e7\u00e3o normal<\/strong>: Desempenho est\u00e1vel sob condi\u00e7\u00f5es nominais.<\/li>\n\n\n\n<li><strong>Cen\u00e1rios de sobrecarga<\/strong>: Fus\u00edvel r\u00e1pido para proteger o circuito.<br>\u26a0 <em>Classifica\u00e7\u00f5es inadequadas de resist\u00eancia\/pot\u00eancia comprometer\u00e3o a prote\u00e7\u00e3o.<\/em><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Three_Fundamental_Selection_Principles\"><\/span><strong>Tr\u00eas princ\u00edpios fundamentais de sele\u00e7\u00e3o<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Fabrica\u00e7\u00e3o certificada<\/strong>: Escolha resistores produzidos sob processos certificados de alto padr\u00e3o.<\/li>\n\n\n\n<li><strong>Avalia\u00e7\u00e3o de fornecedores<\/strong>: Priorizar os fabricantes com <strong>superioridade t\u00e9cnica, garantia de qualidade, efici\u00eancia de custos e suporte confi\u00e1vel<\/strong>.<\/li>\n\n\n\n<li><strong>Aquisi\u00e7\u00e3o direta<\/strong>: Fonte de fornecedores aprovados com cat\u00e1logos de produtos verificados.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Major_Resistor_Brands\"><\/span><strong>Principais marcas de resistores<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Regi\u00e3o<\/th><th>Fabricantes<\/th><\/tr><\/thead><tbody><tr><td><strong>EUA\/UE\/Jap\u00e3o<\/strong><\/td><td>Vishay, TE Connectivity, TT Electronics, Bourns, KOA<\/td><\/tr><tr><td><strong>Taiwan\/China<\/strong><\/td><td>Yageo, Ralec, Uniohm, LIZ, TA-I, Walsin, Viking Tech, HKR, PAK HENG, TOKEN<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"655\" src=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Fixed-Resistors-1024x655.jpg\" alt=\"\" class=\"wp-image-1453\" srcset=\"https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Fixed-Resistors-1024x655.jpg 1024w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Fixed-Resistors-300x192.jpg 300w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Fixed-Resistors-768x491.jpg 768w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Fixed-Resistors-150x96.jpg 150w, https:\/\/topfastpcba.com\/wp-content\/uploads\/2025\/04\/Fixed-Resistors.jpg 1116w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"PCB_Resistor_Soldering_Guidelines\"><\/span><strong>Diretrizes de soldagem de resistores de PCB<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Temperature_Control\"><\/span>1. <strong>Controle de temperatura<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ajuste com base no resistor <strong>material, tamanho e m\u00e9todo de solda<\/strong>.<\/li>\n\n\n\n<li><strong>Muito alto<\/strong>: Risco de danos aos componentes.<\/li>\n\n\n\n<li><strong>Muito baixo<\/strong>: Juntas de solda fracas.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Soldering_Duration\"><\/span>2. <strong>Dura\u00e7\u00e3o da solda<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tempo excessivo<\/strong>: Degrada o desempenho do resistor.<\/li>\n\n\n\n<li><strong>Tempo insuficiente<\/strong>: Baixa ades\u00e3o.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Placement\"><\/span>3. <strong>Coloca\u00e7\u00e3o<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Montagem no <strong>PCB\u2019s top layer<\/strong> (evite o posicionamento na parte inferior).<\/li>\n\n\n\n<li>Minimize a proximidade com outros componentes para evitar interfer\u00eancias.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Soldering_Methods\"><\/span>4. <strong>M\u00e9todos de solda<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Solda manual<\/strong>: Prototipagem de baixo volume.<\/li>\n\n\n\n<li><strong>Solda mec\u00e2nica<\/strong>: Produ\u00e7\u00e3o em massa.<\/li>\n\n\n\n<li>Ambos exigem um controle rigoroso de <strong>temperatura, tempo e posicionamento<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Additional_Checks\"><\/span>5. <strong>Verifica\u00e7\u00f5es adicionais<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>\u2714 Verify resistor <strong>as especifica\u00e7\u00f5es correspondem aos par\u00e2metros de projeto da placa de circuito impresso<\/strong>.<br>\u2714 <strong>Pr\u00e9-limpeza de PCBs<\/strong> para remover contaminantes.<br>\u2714 <strong>Inspe\u00e7\u00e3o p\u00f3s-soldagem<\/strong>: Garanta a estabilidade mec\u00e2nica.<\/p>\n\n\n\n<p><strong>Resumo<\/strong>A soldagem adequada de resistores \u00e9 fundamental para a confiabilidade da placa de circuito impresso. O dom\u00ednio dessas t\u00e9cnicas garante o desempenho ideal do circuito.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Os resistores (comumente chamados simplesmente de \"resistores\" no uso di\u00e1rio) s\u00e3o componentes limitadores de corrente.Quando conectado em um circuito, um resistor normalmente tem um valor de resist\u00eancia fixo com dois pinos que restringem o fluxo de corrente em seu ramo conectado.<\/p>","protected":false},"author":2,"featured_media":1457,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[147],"class_list":["post-1450","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-resistor"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Circuit Board Resistors - Topfastpcba<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/topfastpcba.com\/pt\/circuit-board-resistors\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Circuit Board Resistors - Topfastpcba\" \/>\n<meta property=\"og:description\" content=\"Resistors (commonly referred to simply as &quot;resistors&quot; in daily usage) are current-limiting components. 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