Si4056ADY N-Channel MOSFET Vishay / Siliconix Si4056ADY N-Channel MOSFET comes in a SO-8 package with 100V drain-source voltage rating and 40A pulsed drain current. The MOSFET features low RDS x Qg figure-of-merit (FOM) and is tuned for the lowest RDS x Qoss FOM. Vishay Si4056ADY N-Channel MOSFET is ideally suited for primary-side switches, LED drivers, load switches, and synchronous rectification applications.