D Series Power MOSFETs Vishay / Siliconix D Series Power MOSFETs provide optimal efficiency and operation with fast switching, low FOM, and a simple gate circuitry. The D Series MOSFETs feature a low area-specific on-resistance, low input capacitance, and reduced capacitive switching loss. The Vishay / Siliconix D Series Power MOSFETs offer a maximum 550V drain-source voltage and ±30V gate-source voltage.