{"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\/de_at\/fr-4-pcb-guide-properties-limits-material-choices\/","title":{"rendered":"FR-4 PCB Leitfaden: Eigenschaften, Grenzwerte und Materialauswahl"},"content":{"rendered":"<h2 class=\"wp-block-heading\">fr4 - Definition und Bedeutung<\/h2>\n\n\n\n<p>fr4 ist der Code f\u00fcr die Flammwidrigkeit eines glasfaserverst\u00e4rkten epoxidkupferkaschierten Laminats. Das bedeutet, dass das Harz nach einer Entz\u00fcndung nicht mehr selbst\u00e4ndig brennen darf. fr4 ist nicht der Name eines bestimmten Materials. Es handelt sich um eine Materialklasse, die f\u00fcr Leiterplatten (PCBs) verwendet wird.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Zusammensetzung und g\u00e4ngige Typen<\/h2>\n\n\n\n<p>Es gibt viele Arten von fr4-Materialien, die in normalen Leiterplatten verwendet werden. Die meisten sind Verbundwerkstoffe, die aus einem sogenannten tetrafunktionalen Epoxidharz sowie F\u00fcllstoffen und Glasfasern bestehen.<\/p>\n\n\n\n<p>Beispiel: Wenn eine PCB-Spezifikation lautet <strong>fr4 T:1.0 D\/S<\/strong>, bedeutet: fr4 flammhemmend, T:1,0 bedeutet Dicke 1,0 mm, D\/S bedeutet doppelseitig. Mit anderen Worten, das Plattenmaterial ist ein doppelseitig kupferkaschiertes Epoxid-Glasgewebe-Laminat, 1 mm dick, doppelseitig.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">fr4 - wichtige eigenschaften und klassifizierungen<\/h2>\n\n\n\n<p>Technisch gesehen haben fr4-Laminate eine Reihe von Schl\u00fcsselmerkmalen. Diese umfassen:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Biege- und Sch\u00e4lfestigkeit sowie Temperaturwechselbest\u00e4ndigkeit;<\/li>\n\n\n\n<li>stark flammhemmend;<\/li>\n\n\n\n<li>Volumenwiderstand und Oberfl\u00e4chenwiderstand;<\/li>\n\n\n\n<li>Dielektrizit\u00e4tskonstante (Dk) und Verlustfaktor (Verlusttangente);<\/li>\n\n\n\n<li>Glas\u00fcbergangstemperatur (Tg);<\/li>\n\n\n\n<li>Ma\u00dfhaltigkeit, maximale Einsatztemperatur und Verzug.<\/li>\n<\/ul>\n\n\n\n<p>Diese Eigenschaften zusammen bestimmen die Leistung von fr4 bei der Leiterplattenherstellung.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">andere \u00fcbliche PCB-Basismaterialien<\/h2>\n\n\n\n<p>\u25c9 Platten auf Glasgewebebasis<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Glasfaserplatten: fr4 und fr5<br>In beiden F\u00e4llen wird spezielles elektronisches Gewebe verwendet, das mit Epoxidharz (oder Epoxid-Phenolharz) getr\u00e4nkt ist. Anschlie\u00dfend werden sie unter hoher Hitze und Druck ausgeh\u00e4rtet. fr4 ist die meistverwendete Leiterplatte bei der Leiterplattenherstellung. Sie hat gute elektrische Eigenschaften, gute mechanische Festigkeit und Hitzebest\u00e4ndigkeit. Sie wird h\u00e4ufig bei der Herstellung von mehrlagigen Leiterplatten verwendet.<\/li>\n<\/ol>\n\n\n\n<p>\u25c9 Papierbasierte Platten<br>2. Papptafeln: fr-1, fr-2, fr-3<br>Phenolpapierplatten verwenden Phenolharz als Bindemittel und Holzfasergewebe als Oberfl\u00e4chenverst\u00e4rkung. Sie werden unter hoher Hitze und Druck hergestellt.<\/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>\u25c9 Verbundwerkstoffplatten<br>3. Zusammengesetzte Platten: CEM-1 und CEM-3<br>Zu den Verbundplatten geh\u00f6rt die CEM-Serie kupferkaschierter Laminate. CEM-1 verwendet Epoxidpapier als Kern. Bei CEM-3 wird ein Epoxid-Glasvlies als Kern verwendet. Diese CEM-Platten sind leicht zu verarbeiten. Sie zeichnen sich durch gute Ebenheit, Ma\u00dfhaltigkeit und pr\u00e4zise Dicke aus. Ihre mechanische Festigkeit, ihre dielektrischen Eigenschaften, ihre Wasseraufnahme und ihre Best\u00e4ndigkeit gegen Metallmigration sind besser als bei Papierplatten. CEM-3 kann etwa 80% der mechanischen Festigkeit von fr4 erreichen, kostet aber in der Regel weniger.<\/p>\n\n\n\n<p>\u25c9 Besondere Werkstoffplatten<br>4. Spezielle Tafeln (zum Beispiel, <a href=\"https:\/\/flj-pcb.com\/de_at\/pcb-manufacturer\/ceramic-pcb\/\" data-type=\"page\" data-id=\"2364\">Keramik und Metall<\/a>)<br>Dazu geh\u00f6ren Keramiksubstrate und Metallkernplatten. Sie haben besondere Eigenschaften f\u00fcr Anwendungen, die eine h\u00f6here Materialleistung erfordern.<\/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\">Vorteile und Grenzen von fr4<\/h2>\n\n\n\n<p>Seit ich mit dem Design von Leiterplatten begonnen habe, ist fr4 das Standardmaterial f\u00fcr Leiterplatten. Anfangs nannten einige Designer jede Leiterplatte \u201cfr4\u201d, ob sie es nun war oder nicht. fr4 ist ein flammhemmendes, glasfaserverst\u00e4rktes Epoxidlaminat vom Typ 4. Es ist kosteng\u00fcnstig. Es ist ein guter elektrischer Isolator. Es ist sowohl unter trockenen als auch unter feuchten Bedingungen stabil. Au\u00dferdem l\u00e4sst es sich leicht zu Platten verarbeiten. Aus diesen Gr\u00fcnden wird fr4 h\u00e4ufig f\u00fcr die Herstellung von Leiterplatten verwendet.<\/p>\n\n\n\n<p>fr4 hat Grenzen. Es kann Probleme bekommen, wenn zu viel Strom, Spannung oder Hitze vorhanden ist. Wenn man es \u00fcber seine Grenzen hinaus belastet, sinken seine dielektrischen Eigenschaften. Das bedeutet, dass das Material seine Isolierung verliert und beginnt zu leiten. Ein weiteres Problem ist die Beibehaltung einer stabilen Impedanz bei Hochgeschwindigkeitsdesigns. Die Dielektrizit\u00e4tskonstante von fr4 kann \u00fcber die L\u00e4nge und Breite der Leiterplatte variieren. Mit zunehmender Designgeschwindigkeit kann der Signalverlust, der bei Low-Speed-Platinen akzeptabel war, bei fr4-Platinen zu hoch werden.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ist fr4 die beste Wahl f\u00fcr das Design von Hochgeschwindigkeits-Leiterplatten?<\/h2>\n\n\n\n<p>Wenn wir ein Projekt au\u00dferhalb unserer Komfortzone in Angriff nehmen, lernen wir neue Grenzen kennen. F\u00fcr mich kam dieser Tag, als mein Chef mich um eine <a href=\"https:\/\/flj-pcb.com\/de_at\/pcb-manufacturer\/high-speed-pcb\/\" data-type=\"page\" data-id=\"2370\">Hochgeschwindigkeitskarte<\/a>. Ich wusste, dass Hochgeschwindigkeitsdesign Grenzen hat, die wir bei normalen Schaltungen nicht sehen. Zun\u00e4chst erstellte ich einen Schaltplan, der f\u00fcr hohe Geschwindigkeiten geeignet war. Dann \u00fcberlegte ich mir, ob ich f\u00fcr den Hochgeschwindigkeits-Prototyp fr4 oder ein spezielleres Material verwenden sollte. Bevor ich mich entscheide, m\u00f6chte ich darauf hinweisen, dass in diesem Text der Begriff \u201cHochgeschwindigkeit\u201d f\u00fcr alles verwendet wird, was \u00fcber <strong>50 MHz<\/strong>. Dies sind die wesentlichen Probleme in diesem Frequenzbereich.<\/p>\n\n\n\n<p>F\u00fcr Hochgeschwindigkeitsdesigns gelten strengere Regeln f\u00fcr die Signalintegrit\u00e4t. Sie m\u00fcssen das Routing genau kontrollieren, um diese Regeln zu erf\u00fcllen. Aber auch das Leiterplattenmaterial selbst ist Teil der Gleichung f\u00fcr die Signalintegrit\u00e4t. Daher sollte das Material f\u00fcr Hochgeschwindigkeitsplatinen eine enge Dk-Toleranz und andere kontrollierte Eigenschaften aufweisen, um die Impedanz zu kontrollieren. Wenn die Impedanz im gesamten Design variiert, reflektieren Hochgeschwindigkeitssignale auf ihrem Weg Energie zur\u00fcck und das Signal wird verzerrt. Auch ein niedriger Verlusttangens tr\u00e4gt dazu bei, dass das Signal stark bleibt. Schlie\u00dflich tr\u00e4gt die thermische Stabilit\u00e4t dazu bei, dass sich die dielektrischen Eigenschaften nicht verschlechtern.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">wie spezialisierte Hochgeschwindigkeitsmaterialien im Vergleich zu fr4<\/h2>\n\n\n\n<p>Spezielle Hochgeschwindigkeitsmaterialien, wie duroplastische Kohlenwasserstofflaminate und PTFE-Laminate, bieten oft eine bessere und zuverl\u00e4ssigere Leistung bei Konstruktionen mit h\u00f6heren Frequenzen als fr4. Im Folgenden werden einige der wichtigsten Vorteile dieser Materialien beschrieben:<\/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>Geringerer Signalverlust.<\/strong> Mit zunehmender Frequenz der \u00dcbertragungsleitung steigt der Signalverlust. Hochgeschwindigkeitslaminate haben einen viel geringeren Verlusttangens als fr4. Einige Materialien, wie nahezu reine PTFE-Laminate, sind um eine Gr\u00f6\u00dfenordnung besser. Ein geringerer Verlusttangens ist ein Schl\u00fcsselfaktor f\u00fcr die Reduzierung von Signalverlusten.<\/li>\n\n\n\n<li><strong>Strengere Impedanzkontrolle.<\/strong> Herk\u00f6mmliche Materialien wie fr4 k\u00f6nnen die Dielektrizit\u00e4tskonstante (Dk) nicht so genau halten wie Hochgeschwindigkeitsmaterialien. fr4 Dk kann um \u00b110% oder mehr schwanken. Materialien wie PTFE k\u00f6nnen Dk innerhalb von etwa \u00b12% oder besser halten.<\/li>\n\n\n\n<li><strong>Besseres W\u00e4rmemanagement.<\/strong> Einige Hochgeschwindigkeitslaminate (z. B. duroplastische Kohlenwasserstofflaminate) haben eine viel bessere W\u00e4rmeleitf\u00e4higkeit als fr4. Wenn Ihr Entwurf mit W\u00e4rme umgehen muss, sind diese Laminate eine Untersuchung wert.<\/li>\n\n\n\n<li><strong>Geringere Feuchtigkeitsaufnahme.<\/strong> Wasser hat dielektrische Wirkungen. Selbst geringe Feuchtigkeit in einer Leiterplatte kann die elektrische Leistung von Hochfrequenzschaltungen ver\u00e4ndern. Obwohl der Text sagt, dass die Feuchtigkeitsaufnahme von fr4 bei 50% liegt, k\u00f6nnen einige Hochgeschwindigkeitsmaterialien (z. B. einige PTFE-Laminate) eine viel geringere Feuchtigkeitsaufnahme haben, die bei 2% liegt, und dies hilft, ein stabiles elektrisches Verhalten zu erhalten.<\/li>\n\n\n\n<li><strong>St\u00e4rkere Dimensionsstabilit\u00e4t.<\/strong> Dichte Hochgeschwindigkeits-Layouts erfordern eine strenge Ma\u00dfkontrolle. fr4 ist f\u00fcr seine gute Ma\u00dfhaltigkeit bekannt, aber einige Hochgeschwindigkeitsmaterialien bieten eine bessere Gesamtleistung f\u00fcr Designs mit engen Toleranzen. In solchen F\u00e4llen k\u00f6nnen duroplastische Kohlenwasserstoff-Laminate die bessere Wahl sein.<\/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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