{"id":4722,"date":"2026-02-25T06:02:44","date_gmt":"2026-02-25T06:02:44","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4722"},"modified":"2026-02-25T06:02:48","modified_gmt":"2026-02-25T06:02:48","slug":"why-via-impedance-is-hard-to-control","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/es\/why-via-impedance-is-hard-to-control\/","title":{"rendered":"Por qu\u00e9 es dif\u00edcil controlar la impedancia de la v\u00eda"},"content":{"rendered":"<p>Fuimos a una tienda de PCB y les preguntamos: \u201c\u00bfPueden controlar la impedancia de la traza dentro de 10%?\u201d. Nos responder\u00edan con toda confianza \u201c\u00a1No hay problema!\u201d Si presionas un poco y pides 8%, puede que se lo piensen un momento y luego digan: \u201c\u00a1De acuerdo (para las capas internas)!\u201d Si preguntas entonces: \u201c\u00bfSe puede controlar una v\u00eda a 10%?\u201d el barquito de la amistad podr\u00eda... \u00a1volcar!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La cuesti\u00f3n central: Tolerancia de impedancia de trazas frente a v\u00edas<\/h2>\n\n\n\n<p>Tanto las trazas como las v\u00edas conectan los chips transceptores. Entonces, \u00bfpor qu\u00e9 las trazas pueden mantenerse a 10% y las v\u00edas no? Sabemos que las trazas tampoco son f\u00e1ciles de controlar. Entre los factores que afectan a la impedancia de las trazas est\u00e1n el factor de grabado, el desplazamiento de capas y la rugosidad de la superficie. En el caso de las l\u00edneas microstrip, tambi\u00e9n influyen la m\u00e1scara de soldadura y el grosor del cobre. Aun as\u00ed, muchos fabricantes de placas pueden garantizar una tolerancia de impedancia de 10% o incluso 8% para las trazas. En cuanto a las v\u00edas, por lo que s\u00e9 de las tiendas de placas, ninguna promete controlar la impedancia de la v\u00eda dentro de 10%. Esto significa que hay muchos factores en las v\u00edas que las tiendas de placas no pueden controlar, por lo que no pueden garantizarlo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">De qu\u00e9 trata este art\u00edculo<\/h2>\n\n\n\n<p>En este art\u00edculo presento en primer lugar dos procesos de la v\u00eda: el taladrado y el llenado de la v\u00eda. Mucha gente sabe que el taladrado es importante, pero \u00bfhasta qu\u00e9 punto afecta la tolerancia del taladrado al rendimiento de la v\u00eda? En cuanto al relleno, muchos piensan que rellenar una v\u00eda con resina o m\u00e1scara de soldadura cambiar\u00e1 el rendimiento de la v\u00eda. Comprobaremos estos efectos mediante simulaci\u00f3n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. El proceso de perforaci\u00f3n y su impacto en el rendimiento de la v\u00eda<\/h2>\n\n\n\n<p>En primer lugar, la perforaci\u00f3n. A menudo o\u00edmos dos nombres: tama\u00f1o del taladro y tama\u00f1o del agujero acabado. Si dise\u00f1amos un orificio de 8 mil en nuestro archivo de PCB, \u00bfcree que la f\u00e1brica utilizar\u00e1 una broca de 8 mil? Por supuesto que no. Una v\u00eda debe conectar trazas de diferentes capas. El orificio debe estar chapado de modo que el cobre pase verticalmente por \u00e9l. Eso es cobre metalizado. De acuerdo con la norma IPC, el grosor del cobre metalizado tiene unos requisitos fijos, entre 18 \u00b5m y 20 \u00b5m. Por lo tanto, las f\u00e1bricas garantizan que el orificio tenga un grosor de 8 mil despu\u00e9s del chapado. Ese tama\u00f1o final es el agujero acabado. Eso significa que el tama\u00f1o original del taladro debe ser superior a 8 mil. \u00bfCu\u00e1nto m\u00e1s grande? \u00bf10 mil? \u00bf12 mil? Esta diferencia de tama\u00f1o tiene un gran efecto en el rendimiento de la v\u00eda.<\/p>\n\n\n\n<p>De acuerdo con las reglas de tolerancia de taladrado de f\u00e1brica, un agujero acabado de 0,2 mm (8 mil) utilizar\u00e1 al menos una broca de 0,25 mm (10 mil). Si no se especifica un control m\u00e1s estricto, es posible que la f\u00e1brica utilice una broca de 0,3 mm (12 mil). Todo el mundo sabe que una broca m\u00e1s grande produce una impedancia m\u00e1s baja. Pero, \u00bfcu\u00e1nto m\u00e1s baja? Nuestros resultados de simulaci\u00f3n pueden demostr\u00e1rselo.<\/p>\n\n\n\n<p>La simulaci\u00f3n muestra que las v\u00edas de 0,2 mm a 0,3 mm tienen una diferencia de impedancia de m\u00e1s de 5 ohmios.<\/p>\n\n\n\n<p>Si nos fijamos en las p\u00e9rdidas causadas por la v\u00eda, tambi\u00e9n podemos ver claras diferencias.<\/p>\n\n\n\n<p>Para este proceso de taladrado de una sola v\u00eda, la tolerancia de mecanizado por s\u00ed sola puede causar m\u00e1s de una oscilaci\u00f3n de 10%.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Relleno de v\u00edas: Simulaci\u00f3n y resultados<\/h2>\n\n\n\n<p>Ahora sobre el relleno de la v\u00eda. Muchos amigos me preguntaron si rellenar una v\u00eda afecta al rendimiento de la v\u00eda. Yo les dec\u00eda: \u201c\u00a1Ning\u00fan efecto! Ning\u00fan efecto\u201d. Me cre\u00edan, pero segu\u00edan teniendo dudas. As\u00ed que hice simulaciones para comprobarlo.<\/p>\n\n\n\n<p>La siguiente imagen muestra los modelos de v\u00edas rellenas y sin rellenar. El color rojo indica que la v\u00eda est\u00e1 rellena de resina o m\u00e1scara de soldadura.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"400\" height=\"600\" src=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/02\/Return-Loss-Insertion-Loss.webp\" alt=\"Return Loss &amp; Insertion Loss\" class=\"wp-image-4724\" srcset=\"https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/02\/Return-Loss-Insertion-Loss.webp 400w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/02\/Return-Loss-Insertion-Loss-200x300.webp 200w, https:\/\/flj-pcb.com\/wp-content\/uploads\/2026\/02\/Return-Loss-Insertion-Loss-8x12.webp 8w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/figure>\n\n\n\n<p>Comparamos las p\u00e9rdidas de retorno y de inserci\u00f3n de los dos casos. \u00bfPor qu\u00e9 s\u00f3lo hay una l\u00ednea? Porque las l\u00edneas se solapan. \u00bfPor qu\u00e9 se solapan? Porque no hay ning\u00fan efecto. Los resultados son los mismos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Raz\u00f3n te\u00f3rica: Por qu\u00e9 no importa el relleno<\/h2>\n\n\n\n<p>Cualquiera con algo de teor\u00eda de alta velocidad sabe que a mayor velocidad la se\u00f1al muestra efecto piel. La se\u00f1al fluye cerca de la pared exterior de la v\u00eda. As\u00ed que no importa qu\u00e9 diel\u00e9ctrico est\u00e1 dentro de la v\u00eda, el campo electromagn\u00e9tico entre la se\u00f1al y la referencia no se envuelve en el interior. Si no hay campo en el interior, entonces el material dentro de la v\u00eda no tendr\u00e1 ning\u00fan efecto.<\/p>","protected":false},"excerpt":{"rendered":"<p>We went to a PCB shop and asked them: \u201cCan you control trace impedance to within 10%?\u201d They would answer 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