{"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\/de\/fr4-vs-high-speed-pcb-materials\/","title":{"rendered":"Ist FR-4 die beste Materialwahl f\u00fcr Hochgeschwindigkeits-Leiterplatten-Designs?"},"content":{"rendered":"

Wir alle haben schon einmal ein Projekt in Angriff genommen, das au\u00dferhalb unserer Komfortzone liegt. F\u00fcr mich kam dieser Tag, als mein Chef mich bat, eine Hochgeschwindigkeitsleiterplatte zu entwerfen. Obwohl ich mich f\u00fcr einen erfahrenen Schaltungsentwickler hielt, wusste ich, dass die Entwicklung von Hochgeschwindigkeitsplatinen viele Grenzen hat, die man bei der Entwicklung einer durchschnittlichen Schaltung normalerweise nicht kennt. Zun\u00e4chst verbrachte ich viel Zeit damit, den Schaltplan f\u00fcr das Hochgeschwindigkeitsdesign anzupassen. Aber als das erledigt war, konzentrierte ich mich ganz darauf, ob meine Hochgeschwindigkeits-Leiterplatte <\/a>Prototyp sollte verwenden FR-4<\/a> oder ein spezielleres Material. Bevor wir uns ansehen, was ich gelernt habe, ist es wichtig zu wissen, dass in diesem Artikel mit \u201cHochgeschwindigkeit\u201d alles \u00fcber 50 MHz gemeint ist. Dies sind die wesentlichen Punkte, auf die Sie bei der Arbeit in diesem Frequenzbereich achten sollten.<\/p>\n\n\n\n

F\u00fcr Hochgeschwindigkeitsdesigns gelten strengere Regeln f\u00fcr die Signalintegrit\u00e4t als f\u00fcr andere Designs. Auch wenn Sie beim Routing von Hochgeschwindigkeitssignalen sehr vorsichtig sein m\u00fcssen, um diese Regeln zu erf\u00fcllen, ist es wichtig zu verstehen, dass das Leiterplattenmaterial selbst Teil der gesamten Signalintegrit\u00e4tsgleichung ist. Aus diesem Grund m\u00fcssen Leiterplattenmaterialien, die f\u00fcr Hochgeschwindigkeitsdesigns verwendet werden, Eigenschaften wie eine streng kontrollierte Dielektrizit\u00e4tskonstante aufweisen, um die Impedanz zu kontrollieren. Wenn sich die Impedanz im gesamten Design \u00e4ndern darf, werden Hochgeschwindigkeitssignale auf ihrem Weg durch die Leiterbahnen Energie zur\u00fcckreflektieren, und das Signal wird verzerrt. In gleicher Weise ist ein niedriger Verlustfaktor erforderlich, um die Signalintegrit\u00e4t zu erhalten. Schlie\u00dflich ist die thermische Stabilit\u00e4t eine weitere wichtige Eigenschaft, da sie dazu beitr\u00e4gt, dass die dielektrische Leistung nicht nachl\u00e4sst.<\/p>\n\n\n\n

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

FR-4: Vorteile und Nachteile<\/strong><\/strong><\/h2>\n\n\n\n

Seit ich Leiterplatten entwerfe, war FR-4 immer das Standardmaterial f\u00fcr die Leiterplattenproduktion. Als ich noch ein Junior-Designer war, nannten wir sogar alle Leiterplatten \u201cFR-4\u201d, unabh\u00e4ngig davon, ob sie tats\u00e4chlich daraus hergestellt wurden oder nicht. FR-4 ist ein flammwidriges glasfaserverst\u00e4rktes Epoxidlaminat vom Typ 4. Es ist ein sehr kosteng\u00fcnstiges Material. Es ist au\u00dferdem ein sehr guter elektrischer Isolator und sowohl unter trockenen als auch unter feuchten Bedingungen sehr stabil. Es hat auch gute Verarbeitungseigenschaften, was es zu einem sehr guten Material f\u00fcr die Herstellung von Leiterplatten macht.<\/p>\n\n\n\n

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

Der Nachteil von FR-4 ist, dass es Grenzen hat, wenn die Leistung, die Spannung oder die Hitze zu hoch werden. Wenn die Grenzen des Materials \u00fcberschritten werden, nimmt die dielektrische Leistung von FR-4 ab. Das bedeutet, dass sich die Isolierf\u00e4higkeit des Materials verschlechtert und es beginnt, Strom zu leiten. Ein weiteres Problem bei FR-4 ist die Beibehaltung einer stabilen Impedanz bei Hochgeschwindigkeitsdesigns. Das liegt daran, dass sich die Dielektrizit\u00e4tskonstante von FR-4 \u00fcber die L\u00e4nge und Breite der Leiterplatte \u00e4ndern kann. Mit zunehmender Designgeschwindigkeit kann der Signalverlust, der bei Designs ohne hohe Geschwindigkeit akzeptabel ist, bei FR-4-Platinen zu hoch werden.<\/p>\n\n\n\n

Spezialisierte High-Speed-Plattenmaterialien im Vergleich zu FR-4<\/strong><\/strong><\/h2>\n\n\n\n

Spezielle Hochgeschwindigkeitskartonmaterialien, wie duroplastische Kohlenwasserstoff- und PTFE-Laminate<\/a>, kann bei Designs mit h\u00f6heren Frequenzen eine bessere und zuverl\u00e4ssigere Leistung als FR-4 bieten. Wir werden uns sp\u00e4ter mit den Kompromissen befassen, aber zun\u00e4chst wollen wir uns einige der Vorteile ansehen, die diese Hochgeschwindigkeits-Leiterplattenmaterialien bieten k\u00f6nnen:<\/p>\n\n\n\n

    \n
  1. Weniger Signalverlust.<\/strong>\u00a0Mit steigender Frequenz der \u00dcbertragungsleitung wird der Signalverlust zu einem gr\u00f6\u00dferen Problem. Die Materialien f\u00fcr Hochgeschwindigkeits-Designplatinen haben einen viel geringeren Verlustfaktor als FR-4, und einige Materialien, wie nahezu reine PTFE-Laminate, sind um eine Gr\u00f6\u00dfenordnung besser. Diese niedrigeren Verlustfaktoren sind ein wichtiger Faktor bei der Reduzierung von Signalverlusten.<\/li>\n\n\n\n
  2. Strengere Impedanzkontrolle.<\/strong>\u00a0Herk\u00f6mmliche Leiterplattenmaterialien, wie FR-4, k\u00f6nnen die Dielektrizit\u00e4tskonstante (Dk) nicht so gut kontrollieren wie Hochgeschwindigkeitsleiterplattenmaterialien. FR-4 Dk kann um +\/- 10% oder mehr variieren, w\u00e4hrend Materialien wie PTFE die Dk-Toleranz bei +\/- 2% oder besser halten.<\/li>\n\n\n\n
  3. Besseres W\u00e4rmemanagement.<\/strong>\u00a0Einige Materialien f\u00fcr Hochgeschwindigkeitsdesigns, wie z. B. duroplastische Kohlenwasserstofflaminate, haben eine viel bessere W\u00e4rmeleitf\u00e4higkeit als FR-4. Wenn Ihr Design Bedenken hinsichtlich des W\u00e4rmemanagements hat, sollten Sie sich diese Leiterplattenmaterialien ansehen.<\/li>\n\n\n\n
  4. Geringere Feuchtigkeitsaufnahme.<\/strong>\u00a0Wasser hat dielektrische Eigenschaften, und selbst eine kleine Menge Feuchtigkeit, die von einer Leiterplatte mit Hochfrequenzschaltungen aufgenommen wird, kann die elektrische Leistung dieser Schaltungen ver\u00e4ndern. W\u00e4hrend FR-4 eine Feuchtigkeitsabsorptionsrate von ann\u00e4hernd 50% aufweist, haben einige PTFE-Materialien eine Rate von nur 2%, so dass dieses Problem ber\u00fccksichtigt werden sollte.<\/li>\n\n\n\n
  5. Bessere Formbest\u00e4ndigkeit.<\/strong>\u00a0Bei dichten Hochgeschwindigkeitsdesigns mit engen Toleranzen wird die Notwendigkeit der Dimensionsstabilit\u00e4t noch wichtiger. Obwohl FR-4 f\u00fcr seine Dimensionsstabilit\u00e4t bekannt ist, bietet es nicht die anderen Vorteile, die Hochgeschwindigkeitsmaterialien bieten. In diesem Fall sind duroplastische Kohlenwasserstofflaminate m\u00f6glicherweise die bessere Wahl.<\/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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