PCB布线时，走20A的电流，布线宽度应该是多宽啊？150mil 够吗？
推荐回答（4个）
过这么大的电流啊，功率板么？
板子铜箔厚度有35um（0.5盎司）和70um（1盎司）之分，在不考虑温升的情况下，对应的载流量分别为1~1.5A/mm和3A/mm；
对板子要求高的话，最好用70um（1盎司）的板子，线宽用15mm；要是线宽做不了15mm，可以用8mm顶层和底层同时走线，条件还不允许，可以用10mm单层走线，制板时，大电流的线不加阻焊，裸铜，在生产板子的时候在线上镀锡0.2mm左右。
对板子要求不高的话，用35um（0.5盎司）的板子，线宽用20mm，这样的话，线会有少许温升；这个要是线宽做不了20mm，可以用12mm顶层和底层同时走线，条件还不允许，可以用12mm单层走线，制板时，大电流的线不加阻焊，裸铜，在生产板子的时候在线上镀锡厚度大于0.2mm。
兄弟这怎么够呀！你知道150MIL是多少毫米呀！大概是4毫米的样子。
铜箔宽度 铜箔厚度
70um 50um 35um
2.50mm 6.00A 5.10A 4.50A
2.00mm 5.10A 4.30A 4.00A
1.50mm 4.20A 3.50A 3.20A
1.20mm 3.60A 3.00A 2.70A
1.00mm 3.20A 2.60A 2.30A
0.80mm 2.80A 2.40A 2.00A
0.60mm 2.30A 1.90A 1.60A
0.50mm 2.00A 1.70A 1.35A
0.40mm 1.70A 1.35A 1.10A
0.30mm 1.30A 1.10A 0.80A
0.20mm 0.90A 0.70A 0.55A
0.15mm 0.70A 0.50A 0.20A
你看看这个表。我认为你最好是做成铜线上加锡的做保险。也不要把线画的那么宽。
要看你是多厚的铜皮，一般是电源板2盎司铜皮100mil就可以了，1盎司120mil
按照实际电流公式的1.5倍就行了这样工作时才不会发热才不会影响到稳定性
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