{"id":4641,"date":"2026-01-19T09:23:39","date_gmt":"2026-01-19T09:23:39","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4641"},"modified":"2026-01-19T09:23:44","modified_gmt":"2026-01-19T09:23:44","slug":"fr-4-pcb-guide-properties-limits-material-choices","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/es\/fr-4-pcb-guide-properties-limits-material-choices\/","title":{"rendered":"Gu\u00eda FR-4 PCB: Propiedades, l\u00edmites y elecci\u00f3n de materiales"},"content":{"rendered":"<h2 class=\"wp-block-heading\">fr4 - definici\u00f3n y significado<\/h2>\n\n\n\n<p>fr4 es el c\u00f3digo que indica el grado de retardancia a la llama de un laminado epoxi con revestimiento de cobre reforzado con fibra de vidrio. Significa que la resina debe dejar de arder por s\u00ed sola tras una ignici\u00f3n. fr4 no es el nombre de un material espec\u00edfico. Es un grado de material utilizado para PCB (placas de circuito impreso).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">composici\u00f3n y tipos comunes<\/h2>\n\n\n\n<p>Hay muchos tipos de materiales fr4 utilizados en las placas de circuito impreso normales. La mayor\u00eda son materiales compuestos hechos de una resina epoxi llamada tetrafuncional, m\u00e1s cargas y fibra de vidrio.<\/p>\n\n\n\n<p>Ejemplo: si una especificaci\u00f3n de PCB dice <strong>fr4 T:1.0 D\/S<\/strong>, significa: grado ign\u00edfugo fr4, T:1.0 significa grosor 1.0 mm, D\/S significa doble cara. En otras palabras, el material de la placa es un laminado revestido de cobre de doble cara de tela de vidrio epoxi, de 1 mm de grosor, de doble cara.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">fr4 - propiedades y clasificaciones clave<\/h2>\n\n\n\n<p>T\u00e9cnicamente, los laminados fr4 tienen una serie de especificaciones clave. Entre ellas:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>resistencia a la flexi\u00f3n y al pelado, y comportamiento frente al choque t\u00e9rmico;<\/li>\n\n\n\n<li>fuerte retardancia a la llama;<\/li>\n\n\n\n<li>resistividad volum\u00e9trica y resistividad superficial;<\/li>\n\n\n\n<li>constante diel\u00e9ctrica (Dk) y factor de disipaci\u00f3n (tangente de p\u00e9rdida);<\/li>\n\n\n\n<li>temperatura de transici\u00f3n v\u00edtrea (Tg);<\/li>\n\n\n\n<li>estabilidad dimensional, temperatura m\u00e1xima de uso y alabeo.<\/li>\n<\/ul>\n\n\n\n<p>El conjunto de estas propiedades define el rendimiento del fr4 en la fabricaci\u00f3n de placas de circuito impreso.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">otros materiales comunes de base para PCB<\/h2>\n\n\n\n<p>\u25c9 Placas a base de tela de vidrio<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Tableros de tela de vidrio: fr4 y fr5<br>Ambas utilizan un tejido electr\u00f3nico especial empapado en resina epoxi (o epoxi-fen\u00f3lica). A continuaci\u00f3n, se curan a alta temperatura y presi\u00f3n. El fr4 es el tablero m\u00e1s utilizado en la fabricaci\u00f3n de PCB. Tiene buenas propiedades el\u00e9ctricas, buena resistencia mec\u00e1nica y resistencia al calor. Se utiliza mucho en la fabricaci\u00f3n de PCB multicapa.<\/li>\n<\/ol>\n\n\n\n<p>\u25c9 Tableros de papel<br>2. Cartones: fr-1, fr-2, fr-3<br>Los tableros de papel fen\u00f3lico utilizan resina fen\u00f3lica como aglutinante y tela de fibra de pulpa de madera como refuerzo superficial. Se fabrican a alta temperatura y presi\u00f3n.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards.webp\" alt=\"Paper based boards\" class=\"wp-image-4642\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards.webp 800w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-300x169.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-768x432.webp 768w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/Paper-based-boards-18x10.webp 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p>Tableros compuestos<br>3. Tableros compuestos: CEM-1 y CEM-3<br>Las placas de material compuesto incluyen la serie CEM de laminados revestidos de cobre. CEM-1 utiliza papel epoxi como n\u00facleo. CEM-3 utiliza tejido no tejido de vidrio epox\u00eddico como n\u00facleo. Estas placas CEM son f\u00e1ciles de procesar. Tienen buena planitud, estabilidad dimensional y un grosor preciso. Su resistencia mec\u00e1nica, propiedades diel\u00e9ctricas, absorci\u00f3n de agua y resistencia a la migraci\u00f3n de metales son mejores que las de las placas de papel. En particular, el CEM-3 puede alcanzar aproximadamente 80% de la resistencia mec\u00e1nica del fr4, pero suele costar menos.<\/p>\n\n\n\n<p>\u25c9 Tableros de materiales especiales<br>4. Tableros especiales (por ejemplo, <a href=\"https:\/\/flj-pcb.com\/es\/pcb-manufacturer\/ceramic-pcb\/\" data-type=\"page\" data-id=\"2364\">cer\u00e1mica y metal<\/a>)<br>Entre ellos se encuentran los sustratos cer\u00e1micos y las placas con n\u00facleo met\u00e1lico. Tienen propiedades especiales para aplicaciones que necesitan un mayor rendimiento del material.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"500\" height=\"469\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb.webp\" alt=\"ceramic pcb\" class=\"wp-image-4643\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb.webp 500w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb-300x281.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/ceramic-pcb-13x12.webp 13w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">ventajas y l\u00edmites del fr4<\/h2>\n\n\n\n<p>Desde que empec\u00e9 a dise\u00f1ar placas de circuito impreso, el fr4 ha sido el material est\u00e1ndar de las placas. Al principio, algunos dise\u00f1adores llamaban \u201cfr4\u201d a todas las placas, lo fueran o no. El fr4 es un laminado epoxi ign\u00edfugo de tipo 4 reforzado con fibra de vidrio. Es rentable. Es un buen aislante el\u00e9ctrico. Es resistente tanto en condiciones secas como h\u00famedas. Adem\u00e1s, es f\u00e1cil de fabricar. Por estas razones, el fr4 es una elecci\u00f3n habitual para la fabricaci\u00f3n de placas de circuito impreso.<\/p>\n\n\n\n<p>El fr4 tiene l\u00edmites. Puede tener problemas cuando hay demasiada potencia, tensi\u00f3n o calor. Si lo llevas m\u00e1s all\u00e1 de sus l\u00edmites, sus propiedades diel\u00e9ctricas disminuir\u00e1n. Eso significa que el material perder\u00e1 aislamiento y empezar\u00e1 a conducir. Otro problema es mantener una impedancia estable en dise\u00f1os de alta velocidad. La constante diel\u00e9ctrica del fr4 puede variar a lo largo y ancho de la placa. A medida que aumentan las velocidades de dise\u00f1o, la p\u00e9rdida de se\u00f1al que era aceptable en placas de baja velocidad puede llegar a ser demasiado alta en placas fr4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00bfes fr4 la mejor opci\u00f3n para el dise\u00f1o de placas de circuito impreso de alta velocidad?<\/h2>\n\n\n\n<p>Cuando emprendemos un proyecto fuera de nuestra zona de confort, aprendemos nuevos l\u00edmites. Para m\u00ed, ese d\u00eda lleg\u00f3 cuando mi jefe me pidi\u00f3 un <a href=\"https:\/\/flj-pcb.com\/es\/pcb-manufacturer\/high-speed-pcb\/\" data-type=\"page\" data-id=\"2370\">placa de alta velocidad<\/a>. Sab\u00eda que el dise\u00f1o de alta velocidad conlleva l\u00edmites que no vemos en los circuitos normales. Primero hice un esquema adecuado para la alta velocidad. Luego me centr\u00e9 en si el prototipo de alta velocidad deb\u00eda utilizar fr4 o un material m\u00e1s especializado. Antes de elegir, hay que tener en cuenta que en este texto se utiliza \u201calta velocidad\u201d para cualquier cosa por encima de <strong>50 MHz<\/strong>. Estas son las preocupaciones materiales en esa gama de frecuencias.<\/p>\n\n\n\n<p>Los dise\u00f1os de alta velocidad tienen reglas m\u00e1s estrictas para la integridad de la se\u00f1al. Para cumplirlas, hay que controlar minuciosamente el encaminamiento. Pero el propio material de la placa forma parte de la ecuaci\u00f3n de integridad de la se\u00f1al. Por lo tanto, el material de las placas de alta velocidad debe tener una tolerancia Dk ajustada y otras propiedades controladas para ayudar a controlar la impedancia. Si la impedancia var\u00eda en el dise\u00f1o, las se\u00f1ales de alta velocidad reflejar\u00e1n la energ\u00eda en su recorrido y la se\u00f1al se distorsionar\u00e1. Adem\u00e1s, una tangente de p\u00e9rdida baja ayuda a mantener la intensidad de la se\u00f1al. Por \u00faltimo, la estabilidad t\u00e9rmica ayuda a garantizar que las propiedades diel\u00e9ctricas no se descompongan.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">comparaci\u00f3n de los materiales especializados de alta velocidad con el fr4<\/h2>\n\n\n\n<p>Los materiales especiales de alta velocidad, como los laminados de hidrocarburos termoestables y los laminados de PTFE, suelen ofrecer un rendimiento mejor y m\u00e1s fiable que el fr4 en dise\u00f1os de alta frecuencia. A continuaci\u00f3n se indican algunas ventajas clave de estos materiales:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"700\" height=\"525\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb.webp\" alt=\"high-speed pcb\" class=\"wp-image-4645\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb.webp 700w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb-300x225.webp 300w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/01\/high-speed-pcb-16x12.webp 16w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Reducci\u00f3n de la p\u00e9rdida de se\u00f1al.<\/strong> A medida que aumenta la frecuencia de la l\u00ednea de transmisi\u00f3n, crece la p\u00e9rdida de se\u00f1al. Los laminados de alta velocidad tienen una tangente de p\u00e9rdida mucho menor que el fr4. Algunos materiales, como los laminados de PTFE casi puro, son un orden de magnitud mejores. Una tangente de p\u00e9rdida m\u00e1s baja es un factor clave para reducir la p\u00e9rdida de se\u00f1al.<\/li>\n\n\n\n<li><strong>Mayor control de la impedancia.<\/strong> Los materiales tradicionales como el fr4 no pueden mantener la constante diel\u00e9ctrica (Dk) tan ajustada como los materiales de alta velocidad. La Dk del fr4 puede variar en \u00b110% o m\u00e1s. Materiales como el PTFE pueden mantener Dk dentro de \u00b12% o mejor.<\/li>\n\n\n\n<li><strong>Mejor gesti\u00f3n t\u00e9rmica.<\/strong> Algunos laminados de alta velocidad (por ejemplo, los laminados de hidrocarburos termoestables) tienen una conductividad t\u00e9rmica mucho mejor que el fr4. Si su dise\u00f1o necesita gestionar el calor, merece la pena estudiar estos laminados.<\/li>\n\n\n\n<li><strong>Menor absorci\u00f3n de humedad.<\/strong> El agua tiene efectos diel\u00e9ctricos. Incluso una peque\u00f1a humedad en un circuito impreso puede alterar el rendimiento el\u00e9ctrico de los circuitos de alta frecuencia. Aunque el texto dice que la absorci\u00f3n de humedad del fr4 es cercana a 50%, algunos materiales de alta velocidad (por ejemplo algunos laminados de PTFE) pueden tener una absorci\u00f3n de humedad mucho menor, cercana a 2%, y esto ayuda a mantener un comportamiento el\u00e9ctrico estable.<\/li>\n\n\n\n<li><strong>Mayor estabilidad dimensional.<\/strong> Los dise\u00f1os densos y de alta velocidad necesitan un control dimensional estricto. El fr4 es conocido por su buena estabilidad dimensional, pero algunos materiales de alta velocidad ofrecen un mejor rendimiento general para dise\u00f1os de tolerancia estricta. En tales casos, los laminados de hidrocarburos termoestables pueden ser una mejor opci\u00f3n.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"<p>fr4 \u2014 definition and meaning fr4 is the code for the flame-retardant rating of a glass-fiber reinforced epoxy copper clad 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