si4420bdy transistor of datasheet pdf SI4420BDYManufacturer : Vishay Siliconix Description : N-Channel, 30-V MOSFET SI4420BDYManufacturer : VISAY[Vishay Siliconix] Description : N-Channel, 30-V MOSFET SI4420BDYManufacturer : VISAY[VishayDescription : N-Channel, 30-V MOSFET