{"id":4967,"date":"2026-05-25T08:17:53","date_gmt":"2026-05-25T08:17:53","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4967"},"modified":"2026-05-25T08:25:01","modified_gmt":"2026-05-25T08:25:01","slug":"fr4-vs-high-speed-pcb-materials","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/es\/fr4-vs-high-speed-pcb-materials\/","title":{"rendered":"\u00bfEs el FR-4 el mejor material para el dise\u00f1o de placas de circuito impreso de alta velocidad?"},"content":{"rendered":"

Todos hemos pasado por eso en alg\u00fan momento: cuando nos enfrentamos a un proyecto que se sale de nuestra zona de confort. En mi caso, ese d\u00eda lleg\u00f3 cuando mi jefe me pidi\u00f3 que dise\u00f1ara una placa de alta velocidad. Aunque me consideraba un dise\u00f1ador de circuitos con experiencia, sab\u00eda que el dise\u00f1o de placas de circuito impreso de alta velocidad presentaba muchas limitaciones a las que no suele enfrentarse uno al dise\u00f1ar un circuito normal. Al principio, dediqu\u00e9 tiempo a adaptar el esquema al dise\u00f1o de alta velocidad. Pero una vez hecho esto, me centr\u00e9 por completo en si mi PCB de alta velocidad <\/a>El prototipo deber\u00eda utilizar FR-4<\/a> o un material m\u00e1s especializado. Antes de ver lo que he aprendido, es importante saber que, en este art\u00edculo, \u201calta velocidad\u201d se refiere a cualquier frecuencia superior a 50 MHz. Estos son los aspectos fundamentales a los que debes prestar atenci\u00f3n al trabajar en este rango de frecuencias.<\/p>\n\n\n\n

El dise\u00f1o de alta velocidad impone normas m\u00e1s estrictas en materia de integridad de la se\u00f1al que otros dise\u00f1os. Aunque hay que tener mucho cuidado al trazar las se\u00f1ales de alta velocidad para cumplir estas normas, es importante comprender que el propio material de la placa forma parte de la ecuaci\u00f3n global de la integridad de la se\u00f1al. Por este motivo, los materiales de las placas utilizados en el dise\u00f1o de alta velocidad deben presentar propiedades como una constante diel\u00e9ctrica estrictamente controlada que ayude a regular la impedancia. Si se permite que la impedancia var\u00ede a lo largo del dise\u00f1o, las se\u00f1ales de alta velocidad comenzar\u00e1n a reflejar energ\u00eda a medida que se desplazan por las pistas, y la se\u00f1al se distorsionar\u00e1. Del mismo modo, se necesita un factor de disipaci\u00f3n bajo para ayudar a mantener la integridad de la se\u00f1al. Por \u00faltimo, la estabilidad t\u00e9rmica es otra propiedad importante, ya que ayuda a garantizar que el rendimiento diel\u00e9ctrico no se vea afectado.<\/p>\n\n\n\n

\"High-Speed<\/figure>\n\n\n\n

FR-4: Ventajas e inconvenientes<\/strong><\/strong><\/h2>\n\n\n\n

Desde que me dedico al dise\u00f1o de placas de circuito impreso, el FR-4 siempre ha sido el material est\u00e1ndar para la fabricaci\u00f3n de PCB. Cuando a\u00fan era un dise\u00f1ador novato, incluso sol\u00edamos llamar \u201cFR-4\u201d a todas las placas, independientemente de si estaban fabricadas realmente con ese material o no. El FR-4 es un laminado epoxi reforzado con fibra de vidrio de tipo 4, ign\u00edfugo. Se trata de un material muy rentable. Adem\u00e1s, es un excelente aislante el\u00e9ctrico y presenta una gran resistencia tanto en condiciones secas como h\u00famedas. Tambi\u00e9n ofrece un buen rendimiento en la fabricaci\u00f3n, lo que lo convierte en un material ideal para la fabricaci\u00f3n de PCB.<\/p>\n\n\n\n

\"fr-4\"<\/figure>\n\n\n\n

El inconveniente del FR-4 es que presenta limitaciones cuando la potencia, la tensi\u00f3n o el calor alcanzan niveles demasiado elevados. Si se le somete a condiciones que superan sus l\u00edmites de funcionamiento, el rendimiento diel\u00e9ctrico del FR-4 disminuir\u00e1. Esto significa que la capacidad aislante del material empeorar\u00e1 y comenzar\u00e1 a conducir la electricidad. Otro problema del FR-4 es mantener una impedancia estable en dise\u00f1os de alta velocidad. Esto se debe a que la constante diel\u00e9ctrica del FR-4 puede variar a lo largo y a lo ancho de la placa. Adem\u00e1s, a medida que aumenta la velocidad de dise\u00f1o, la p\u00e9rdida de se\u00f1al, que puede ser aceptable en dise\u00f1os que no son de alta velocidad, puede llegar a ser demasiado elevada en las placas de FR-4.<\/p>\n\n\n\n

Materiales especializados para placas de alta velocidad frente al FR-4<\/strong><\/strong><\/h2>\n\n\n\n

Materiales especiales para placas de alta velocidad, como los hidrocarburos termoendurecibles y Laminados de PTFE<\/a>, puede ofrecer un rendimiento mejor y m\u00e1s fiable que el FR-4 en dise\u00f1os con frecuencias m\u00e1s altas. M\u00e1s adelante analizaremos las ventajas e inconvenientes, pero primero veamos algunas de las ventajas que pueden ofrecer estos materiales para placas de alta velocidad:<\/p>\n\n\n\n

    \n
  1. Menor p\u00e9rdida de se\u00f1al.<\/strong>\u00a0A medida que aumenta la frecuencia de la l\u00ednea de transmisi\u00f3n, la p\u00e9rdida de se\u00f1al se convierte en un problema cada vez mayor. Los materiales para placas de dise\u00f1o de alta velocidad tienen un factor de disipaci\u00f3n mucho menor que el FR-4, y algunos materiales, como los laminados de PTFE casi puro, son un orden de magnitud mejores. Estos factores de disipaci\u00f3n m\u00e1s bajos son un factor importante a la hora de reducir la p\u00e9rdida de se\u00f1al.<\/li>\n\n\n\n
  2. Mayor control de la impedancia.<\/strong>\u00a0Los materiales tradicionales para placas de circuito impreso (PCB), como el FR-4, no permiten controlar la constante diel\u00e9ctrica (Dk) tan bien como los materiales para placas de alta velocidad. La Dk del FR-4 puede variar en +\/- 10% o m\u00e1s, mientras que materiales como el PTFE mantienen la tolerancia de la Dk en +\/- 2% o menos.<\/li>\n\n\n\n
  3. Mejor gesti\u00f3n t\u00e9rmica.<\/strong>\u00a0Algunos materiales para placas de circuito impreso de alta velocidad, como los laminados de hidrocarburos termoendurecibles, presentan una conductividad t\u00e9rmica mucho mayor que la del FR-4. Si tu dise\u00f1o plantea problemas de gesti\u00f3n t\u00e9rmica, vale la pena que consideres estos materiales para placas.<\/li>\n\n\n\n
  4. Menor absorci\u00f3n de humedad.<\/strong>\u00a0El agua tiene propiedades diel\u00e9ctricas, e incluso una peque\u00f1a cantidad de humedad absorbida por una placa de circuito impreso (PCB) con circuitos de alta frecuencia puede alterar el rendimiento el\u00e9ctrico de dichos circuitos. Si bien el FR-4 tiene una tasa de absorci\u00f3n de humedad cercana al 50%, algunos materiales de PTFE presentan una tasa tan baja como el 2%, por lo que conviene tener en cuenta este aspecto.<\/li>\n\n\n\n
  5. Mayor estabilidad dimensional.<\/strong>\u00a0En el caso de dise\u00f1os densos de alta velocidad con tolerancias muy ajustadas, la necesidad de estabilidad dimensional cobra a\u00fan mayor importancia. Aunque el FR-4 es conocido por su estabilidad dimensional, no ofrece las dem\u00e1s ventajas que aportan los materiales de alta velocidad. En este caso, los laminados de hidrocarburos termoendurecibles pueden ser la mejor opci\u00f3n.<\/li>\n<\/ol>","protected":false},"excerpt":{"rendered":"

    When we take on a project that is outside our comfort zone, we have all been there at one time 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