IRFB42B20DPBF IRFB42N20 IRFB42N20 MOSFET或IGBT开关IC IRFB42N20D IRFB42N20DPBF IRFB42N20DPBF M IRFB42N20DPBF MOSFET或IGBT IRFB42N20DPBF. IRFB42N20DPBFM IRFB42N20DPBF-VB