STP40NF10L-VB STP40NF10-VB STP40NF12 STP40NF12 75842P STP40NF1275842P STP40NF12-VB STP40NF20 STP40NF20 MOSFET或IGBT STP40NF20 MOSFET或IGBT开关IC STP40NF20 P40NF20