{"id":4732,"date":"2026-02-27T06:10:50","date_gmt":"2026-02-27T06:10:50","guid":{"rendered":"https:\/\/flj-pcb.com\/?p=4732"},"modified":"2026-02-27T06:10:54","modified_gmt":"2026-02-27T06:10:54","slug":"how-to-select-pcb-copper-thickness","status":"publish","type":"post","link":"https:\/\/flj-pcb.com\/de\/how-to-select-pcb-copper-thickness\/","title":{"rendered":"Auswahl der PCB-Kupferdicke"},"content":{"rendered":"<h2 class=\"wp-block-heading\">1. Was ist Kupferfolie?<\/h2>\n\n\n\n<p>Kupferfolie ist ein d\u00fcnnes, durchgehendes Metallblech. Es handelt sich um ein galvanisch abgeschiedenes, negativ geladenes Material. Die Folie wird auf die Basis der Leiterplatte aufgebracht. Sie fungiert als Leiter auf der Leiterplatte. Sie verbindet sich gut mit Isolierschichten. Sie nimmt L\u00f6tmaske und andere Schutzschichten auf. Nach dem \u00c4tzen bildet das verbleibende Kupfer das Schaltungsmuster. In der fr\u00fchen Produktion verwendete man gewalzte Kupferfolie. Das bedeutet, dass Kupferbl\u00f6cke zu d\u00fcnnen Platten gegl\u00e4ttet werden.<\/p>\n\n\n\n<p>Wie dick ist die Kupferfolie auf einer Leiterplatte?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Einheit f\u00fcr die Kupferdicke: oz<\/h2>\n\n\n\n<p>Die Dicke von Leiterplattenkupfer wird gew\u00f6hnlich in oz (Unze) angegeben. Die Unze ist eine Gewichtseinheit. Das Verh\u00e4ltnis zwischen Unze und Gramm ist:<br>1 Unze \u2248 28,35 g.<\/p>\n\n\n\n<p>In der Leiterplattenindustrie bedeutet 1 oz das Gewicht von 1 oz Kupfer, das gleichm\u00e4\u00dfig auf 1 Quadratfu\u00df (ft\u00b2) verteilt ist. Diese gleichm\u00e4\u00dfige Schicht hat eine bestimmte Dicke. Diese Dicke betr\u00e4gt etwa 35 \u03bcm. Mit einer Formel:<br>1 oz = 28,35 g \/ ft\u00b2.<\/p>\n\n\n\n<p>Im Folgenden zeige ich die Berechnung Schritt f\u00fcr Schritt, damit das Ergebnis klar ist:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nehmen Sie 1 Unze Masse: 28,35 g.<\/li>\n\n\n\n<li>Dichte des Kupfers: 8,93 g\/cm\u00b3.<\/li>\n\n\n\n<li>1 ft\u00b2 = 929,03 cm\u00b2.<\/li>\n<\/ul>\n\n\n\n<p>Dicke in cm = Masse \/ (Dichte \u00d7 Fl\u00e4che)<br>= 28,35 \/ (8,93 \u00d7 929,03) cm<br>= 28,35 \/ 82973,558 \u2248 0,00341721 cm.<\/p>\n\n\n\n<p>Umrechnung in Mikrometer (\u03bcm): 0,00341721 cm = 0,00341721 \u00d7 10.000 \u03bcm = 34,17 \u03bcm.<\/p>\n\n\n\n<p>Also 1 Unze Kupferfolie \u2248 <strong>34,17 \u03bcm<\/strong>. Dieser Wert wird in der Regel gerundet und angegeben als <strong>35 \u03bcm<\/strong>. Imperiale Einheiten: 34,17 \u03bcm = 0,03417 mm. Ein mil = 0,0254 mm, also Dicke \u2248 1,345 mil. Man sagt oft <strong>1 Unze \u2248 35 \u03bcm \u2248 1,35 mil<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. \u00dcbliche Kupferdickenwerte<\/h2>\n\n\n\n<p>\u00dcbliche Werte f\u00fcr die Kupferdicke in Leiterplatten sind:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>0,5 Unzen \u2248 17,5 \u03bcm<\/li>\n\n\n\n<li>1 oz \u2248 35 \u03bcm<\/li>\n\n\n\n<li>2 oz \u2248 70 \u03bcm<\/li>\n\n\n\n<li>3 oz \u2248 105 \u03bcm<\/li>\n<\/ul>\n\n\n\n<p>Typische Einzel- und <a href=\"https:\/\/flj-pcb.com\/de\/pcb-manufacturer\/multilayer-pcb\/\" data-type=\"link\" data-id=\"https:\/\/flj-pcb.com\/pcb-manufacturer\/multilayer-pcb\/\">doppelseitige PCBs<\/a> \u00fcber verwenden <strong>35 \u03bcm (1 Unze)<\/strong> Kupfer. Einige Platten verwenden <strong>50 \u03bcm<\/strong> oder <strong>70 \u03bcm<\/strong> auch Kupfer. Bei mehrlagigen Leiterplatten sind die \u00e4u\u00dferen Lagen oft <strong>35 \u03bcm (1 Unze)<\/strong>. Die inneren Schichten sind oft <strong>17,5 \u03bcm (0,5 Unzen)<\/strong>.<\/p>\n\n\n\n<p>Platten aus dickem Kupfer beginnen bei etwa <strong>3 Unzen<\/strong> und h\u00f6her. Diese Platinen werden in Hochstrom- oder Hochspannungsprodukten, wie z. B. Netzteilen, verwendet.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Strombelastbarkeit bei unterschiedlichen Kupferdicken<\/h2>\n\n\n\n<p>Nachstehend finden Sie eine praktische Tabelle mit typischen Stromst\u00e4rken f\u00fcr Kupferb\u00e4nder unterschiedlicher Dicke und Breite. In der Tabelle sind Stromst\u00e4rke (A) und erforderliche Breite (mm) f\u00fcr Kupferst\u00e4rken von <strong>70 \u03bcm<\/strong>, <strong>50 \u03bcm<\/strong>, und <strong>35 \u03bcm<\/strong>. Der Pr\u00fcfdickenparameter in der Tabelle ist t = 10 (dies ist ein in der Quellentabelle verwendeter Referenzwert).<\/p>\n\n\n\n<p><strong>Anmerkung:<\/strong> Wenn Sie Kupferfolie als Leiter f\u00fcr hohe Str\u00f6me verwenden, ist es \u00fcblich, die Tabellenwerte um <strong>50%<\/strong> um eine sichere Wahl zu treffen. Das bedeutet, dass Sie eine Breite w\u00e4hlen sollten, die etwa der H\u00e4lfte des angegebenen Stroms entspricht, wenn Sie einen Sicherheitsabstand w\u00fcnschen.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Strom (A) \/ Breite (mm) f\u00fcr 70 \u03bcm<\/th><th>Strom (A) \/ Breite (mm) f\u00fcr 50 \u03bcm<\/th><th>Strom (A) \/ Breite (mm) f\u00fcr 35 \u03bcm<\/th><\/tr><\/thead><tbody><tr><td>6,00 A - 2,50 mm<\/td><td>5,10 A - 2,50 mm<\/td><td>4,50 A - 2,50 mm<\/td><\/tr><tr><td>5,10 A - 2,00 mm<\/td><td>4,30 A - 2,00 mm<\/td><td>4,00 A - 2,00 mm<\/td><\/tr><tr><td>4,20 A - 1,50 mm<\/td><td>3,50 A - 1,50 mm<\/td><td>3,20 A - 1,50 mm<\/td><\/tr><tr><td>3,60 A - 1,20 mm<\/td><td>3,00 A - 1,20 mm<\/td><td>2,70 A - 1,20 mm<\/td><\/tr><tr><td>3,20 A - 1,00 mm<\/td><td>2,60 A - 1,00 mm<\/td><td>2,30 A - 1,00 mm<\/td><\/tr><tr><td>2,80 A - 0,80 mm<\/td><td>2,40 A - 0,80 mm<\/td><td>2,00 A - 0,80 mm<\/td><\/tr><tr><td>2,30 A - 0,60 mm<\/td><td>1,90 A - 0,60 mm<\/td><td>1,60 A - 0,60 mm<\/td><\/tr><tr><td>2,00 A - 0,50 mm<\/td><td>1,70 A - 0,50 mm<\/td><td>1,35 A - 0,50 mm<\/td><\/tr><tr><td>1,70 A - 0,40 mm<\/td><td>1,35 A - 0,40 mm<\/td><td>1,10 A - 0,40 mm<\/td><\/tr><tr><td>1,30 A - 0,30 mm<\/td><td>1,10 A - 0,30 mm<\/td><td>0,80 A - 0,30 mm<\/td><\/tr><tr><td>0,90 A - 0,20 mm<\/td><td>0,70 A - 0,20 mm<\/td><td>0,55 A - 0,20 mm<\/td><\/tr><tr><td>0,70 A - 0,15 mm<\/td><td>0,50 A - 0,15 mm<\/td><td>0,20 A - 0,15 mm<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Auch hier sollten Sie einen sicheren Spielraum w\u00e4hlen. Eine allgemeine Regel ist, diese Tabellenwerte um 50% zu reduzieren, wenn Sie f\u00fcr die Produktion entwerfen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. Weitere praktische Hinweise zu Kupfer als Leiter<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wenn Sie Kupferfolien als lange Leiterbahnen verwenden, m\u00fcssen Sie deren Strombelastbarkeit pr\u00fcfen. Nehmen Sie zum Beispiel eine typische Dicke von <strong>0,03 mm (30 \u03bcm)<\/strong>. Wenn das Kupferband eine Breite W (mm) und eine L\u00e4nge L (mm) hat, kann der Gleichstromwiderstand n\u00e4herungsweise wie folgt berechnet werden: R \u2248 0,0005 \u00d7 L \/ W (Ohm) Diese Formel erm\u00f6glicht eine schnelle Absch\u00e4tzung f\u00fcr die Entwurfspr\u00fcfung.<\/li>\n\n\n\n<li>Die Strombelastbarkeit von Kupfer h\u00e4ngt auch von den Bauteilen auf der Leiterplatte, der Anzahl und Art der Bauteile und der K\u00fchlung ab. Die tats\u00e4chliche Strombelastbarkeit h\u00e4ngt also sowohl von der Kupfergeometrie als auch von den thermischen Bedingungen ab.<\/li>\n\n\n\n<li>Eine praktische Faustformel lautet: Strombelastbarkeit \u2248 0,15 \u00d7 W (A). Dies ist eine empirische Sch\u00e4tzung, die in einigen F\u00e4llen verwendet wird. Sie ist einfach und f\u00fcr viele Platten konservativ.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">6. Beispiel: Fl\u00e4che und Stromdichte<\/h2>\n\n\n\n<p>Nehmen wir einen allgemeinen Fall: Kupferdicke <strong>35 \u03bcm<\/strong> und Leiterbahnbreite <strong>1 mm<\/strong>. Die Querschnittsfl\u00e4che betr\u00e4gt:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fl\u00e4che = Dicke \u00d7 Breite = 0,035 mm \u00d7 1 mm = 0,035 mm\u00b2.<\/li>\n<\/ul>\n\n\n\n<p>Wenn Sie eine Stromdichte-Regel von <strong>30 A\/mm\u00b2<\/strong>, dann Strom pro 1 mm Breite \u2248 30 \u00d7 0,035 = 1,05 A. Nach dieser Faustformel also etwa 1 A pro mm Leiterbahnbreite.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">7. IPC-Formeln f\u00fcr einen genaueren Strom- und Temperaturanstieg<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.electronics.org\/TOC\/IPC-2152.pdf\" target=\"_blank\" rel=\"noopener\">IPC-2152<\/a> und <a href=\"https:\/\/standards.globalspec.com\/std\/155369\/ipc-d-275\" data-type=\"link\" data-id=\"https:\/\/standards.globalspec.com\/std\/155369\/ipc-d-275\" target=\"_blank\" rel=\"noopener\">IPC-D-275<\/a> geben genauere Modelle. Der Text enth\u00e4lt die IPC-D-275-Formeln in einer gemeinsamen Form:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>F\u00fcr interne Spuren: I = 0,0150 \u00d7 (\u0394T^0,5453) \u00d7 (A^0,7349)<\/li>\n\n\n\n<li>F\u00fcr externe Spuren: I = 0,0647 \u00d7 (\u0394T^0,4281) \u00d7 (A^0,6732)<\/li>\n<\/ul>\n\n\n\n<p>In diesen Formeln:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>I ist der Strom in Ampere.<\/li>\n\n\n\n<li>\u0394T ist der zul\u00e4ssige Temperaturanstieg in \u00b0C.<\/li>\n\n\n\n<li>A ist die Querschnittsfl\u00e4che in mil\u00b2 (oder anderen Einheiten, je nachdem, wie Sie die Formel anwenden). Verwenden Sie einheitliche Einheiten, wenn Sie die Formeln anwenden.<\/li>\n<\/ul>\n\n\n\n<p>Verwenden Sie IPC-Methoden, wenn Sie einen genauen zul\u00e4ssigen Strom f\u00fcr einen bestimmten Temperaturanstieg ben\u00f6tigen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">8. Kupferdicke und dielektrische Anpassung<\/h2>\n\n\n\n<p>Beim Leiterplattendesign bedeutet \u201cKupferdicke-Dielektrikum-Anpassung\u201d, dass Sie die Kupferdicke und das Dielektrikum der Leiterplatte gemeinsam ausw\u00e4hlen. Dies geschieht, um den elektrischen, thermischen und mechanischen Anforderungen gerecht zu werden. Die wichtigsten Punkte:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">8.1 Kupfergewicht (Kupferdicke)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Einheit: oz\/ft\u00b2 (zum Beispiel 0,5 oz, 1 oz, 2 oz, 3 oz).<\/li>\n\n\n\n<li>1 oz \u2248 35 \u03bcm \u2248 1,35 mil.<\/li>\n\n\n\n<li>Auswirkungen:\n<ul class=\"wp-block-list\">\n<li>Strom\u00fcbertragung: Dickeres Kupfer leitet mehr Strom.<\/li>\n\n\n\n<li>Verlust: Bei hohen Frequenzen spielt der Skineffekt eine Rolle. Dickeres Kupfer kann in einigen F\u00e4llen den Leitungsverlust verringern.<\/li>\n\n\n\n<li>Thermisch: Dickeres Kupfer f\u00f6rdert die W\u00e4rmeausbreitung.<\/li>\n\n\n\n<li>\u00c4tzen: Dickeres Kupfer macht die Fein\u00e4tzung schwieriger. Mindestbreite und -abstand der Leiterbahnen k\u00f6nnen sich erh\u00f6hen.<\/li>\n\n\n\n<li>Kosten: Dickeres Kupfer kostet mehr.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.2 Dielektrisches Material<\/h3>\n\n\n\n<p>Wichtige dielektrische Eigenschaften:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dielektrizit\u00e4tskonstante (Dk oder \u03b5r): beeinflusst die Signalgeschwindigkeit und die Impedanz.<\/li>\n\n\n\n<li>Verlusttangente (Df): beeinflusst den Hochfrequenzverlust.<\/li>\n\n\n\n<li>Dicke (H): Mit der Kupferdicke entscheidet H \u00fcber Impedanz und Kapazit\u00e4t.<\/li>\n\n\n\n<li>CTE und Tg: thermische Zuverl\u00e4ssigkeit.<br>\u00dcbliche Materialien: <strong>fr4<\/strong> f\u00fcr den allgemeinen Gebrauch, Hoch-Tg fr4 und spezielle Hochfrequenzmaterialien (z. B. Rogers).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.3 Abgleichsregeln<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>F\u00fcr die Impedanzkontrolle lautet eine g\u00e4ngige Formel f\u00fcr Mikrostreifenleitungen: Z0 \u2248 (87 \/ sqrt(\u03b5r_eff + 1.41)) * ln(5.98H \/ (0.8W + T)) wobei Z0 die Impedanz, \u03b5r_eff die effektive Dielektrizit\u00e4tskonstante, H die dielektrische Dicke, W die Leiterbahnbreite und T die Kupferdicke ist.<\/li>\n\n\n\n<li>Wenn die Kupferdicke zunimmt, sinkt die Impedanz bei gleicher Breite und gleichem Dielektrikum. Sie m\u00fcssen also die Breite vergr\u00f6\u00dfern oder die dielektrische Dicke erh\u00f6hen, um die gleiche Impedanz zu erhalten.<\/li>\n\n\n\n<li>Bei Hochfrequenzsignalen kommt es auf die Eindringtiefe an. Die Kupferdicke sollte mindestens ein Mehrfaches der Hauttiefe bei der h\u00f6chsten interessierenden Frequenz betragen. Bei sehr hohen Frequenzen spielt auch die Oberfl\u00e4chenrauhigkeit eine Rolle. Verwenden Sie Kupfer mit geringer Rauheit, wenn Sie einen niedrigen Verlust ben\u00f6tigen.<\/li>\n\n\n\n<li>Verwenden Sie f\u00fcr Leistungsebenen und Starkstrom dickeres Kupfer (\u2265 2 oz) und ziehen Sie f\u00fcr das W\u00e4rmemanagement w\u00e4rmeleitende dielektrische oder Metallkernplatten in Betracht.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">8.4 Herstellbarkeit<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bei dickem Kupfer (\u2265 3 oz) sind gr\u00f6\u00dfere Leiterbahn-\/Abstandsregeln erforderlich, um \u00c4tzprobleme zu vermeiden.<\/li>\n\n\n\n<li>D\u00fcnne Dielektrika erfordern eine genaue Kontrolle der Kupferdicke. Variationen beeinflussen die Impedanz.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">9. Auswahltabelle (Kurzanleitung)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Anwendungsszenario<\/th><th>Empfohlenes Kupfergewicht<\/th><th>Empfohlenes dielektrisches Material<\/th><th>Passende Begr\u00fcndung<\/th><\/tr><\/thead><tbody><tr><td>Digitale Hochgeschwindigkeit (&gt;5 Gbps)<\/td><td>0,5 Unzen - 1 Unze<\/td><td>low-Df FR4 \/ <a href=\"https:\/\/www.rogerscorp.com\/advanced-electronics-solutions\/ro4000-series-laminates\" target=\"_blank\" rel=\"noopener\">Rogers RO4000<\/a><\/td><td>Feines Routing, geringe Verluste, einfachere Impedanzkontrolle.<\/td><\/tr><tr><td>Leistungsmodule \/ Hochstrom<\/td><td>2 Unzen - 6 Unzen+<\/td><td><a href=\"https:\/\/flj-pcb.com\/de\/fr-4-pcb-guide-properties-limits-material-choices\/\" data-type=\"post\" data-id=\"4641\">FR4<\/a> Materialien mit hohem Tg-Wert und hoher W\u00e4rmeleitf\u00e4higkeit<\/td><td>H\u00f6here Stromkapazit\u00e4t und bessere W\u00e4rmeableitung.<\/td><\/tr><tr><td>RF\/Mikrowellen (&gt;10 GHz)<\/td><td>0,5 Unzen (geringe Rauheit)<\/td><td><a href=\"https:\/\/www.rogerscorp.com\/advanced-electronics-solutions\/ro3000-series-laminates\" target=\"_blank\" rel=\"noopener\">Rogers RO3000<\/a> \/ <a href=\"https:\/\/flj-pcb.com\/de\/pcb-substrate-classification-and-material-properties\/\" data-type=\"post\" data-id=\"4685\">Teflon (PTFE)<\/a><\/td><td>Ultra-niedriger Verlust und optimierte Oberfl\u00e4cheneffekte f\u00fcr RF.<\/td><\/tr><tr><td>Allgemeine Unterhaltungselektronik<\/td><td>1 Unze<\/td><td>Standard FR4<\/td><td>Ausgewogene Kosten und ausgereifte Verfahren.<\/td><\/tr><tr><td>HDI-Karten mit hoher Packungsdichte<\/td><td>0,5 Unzen - 1 Unze<\/td><td>FR4 Materialien mit hohem Tg \/ niedrigem CTE<\/td><td>Feine Spuren und zuverl\u00e4ssige Laserleistung.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">10. Praktische Ratschl\u00e4ge<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Nennen Sie zun\u00e4chst Ihre Anforderungen: Stromst\u00e4rke, Signalgeschwindigkeit, Impedanz, W\u00e4rme.<\/li>\n\n\n\n<li>Planen Sie die Stapelung mit geeigneten Werkzeugen.<\/li>\n\n\n\n<li>F\u00fchren Sie eine Impedanzsimulation mit Material Dk und Kupferdicke durch.<\/li>\n\n\n\n<li>Erkundigen Sie sich bei der Plattenfirma nach den Toleranzen f\u00fcr die Kupferdicke und den dielektrischen Optionen.<\/li>\n\n\n\n<li>Bei hohen Frequenzen sollten Sie nach M\u00f6glichkeit die Materialien Dk und Df messen.<\/li>\n<\/ol>\n\n\n\n<p><strong>Anmerkung:<\/strong> Das Nenngewicht des Kupfers (z. B. 1 Unze) ist die Ausgangsdicke vor dem \u00c4tzen. Nach dem \u00c4tzen kann die Leiterbahn verj\u00fcngte Seiten haben. F\u00fcr echte Impedanzpr\u00fcfungen verwenden Sie entweder die Durchschnittsdicke oder die Leiterplattenhaus-Richtwerte.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>1. What is copper foil? Copper foil is a thin, continuous metal sheet. It is an electro-deposited, negative-type material. The 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