电源过孔与电流~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~珠联璧合珠联璧合珠联璧合珠联璧合lzxiao@sohu.comlzxiao@sohu.comlzxiao@sohu.comlzxiao@sohu.com1.1.1.1.常用电源过孔尺寸电源过孔常用via10-24via10-24via10-24via10-24,via20-35via20-35via20-35via20-35和via24-40via24-40via24-40via24-40。电源较大时,一个管脚可以打几个过孔。2.2.2.2.电源过孔尺寸与电流关系�对于信号过孔,承载电流能力的瓶颈不在过孔上面,而在传输线上面。�对于电源过孔,理论值是1A对应一个过孔(via10-24via10-24via10-24via10-24和via12-25via12-25via12-25via12-25),保守的额定电流值为300~600mA。电源过孔原则上推荐使用大过孔,如via20-35via20-35via20-35via20-35和via24-40via24-40via24-40via24-40。铜皮厚度0.5Z,铜皮Δt=10°C铜皮厚度10Z,铜皮Δt=10°C过孔孔径大小(mm)电流(A)过孔孔径大小(mm)电流(A)0.200.410.200.680.250.4840.250.8050.300.5050.300.840.350.5050.350.840.400.5950.400.9910.500.5950.500.991