The CPC3981ZTR from Littelfuse is an N-Channel Depletion Mode Power MOSFET that is ideal for normally on switches, solid state relays, converters, telecommunications, power supplies, and current regulators applications. It has a drain-source breakdown voltage of over 800 V, a gate threshold voltage of up to -3.1 V, and a drain-source on-resistance of less than 45 ohms. This MOSFET has a continuous drain current of up to 100 mA and a power dissipation of less than 2.25 W. It is used extensively in smaller integrated circuits’ solid-state relays for use in power, industrial, and telecommunications applications with greater separation of the drain and source leads for high-voltage applications. This MOSFET is available in a surface mount package that measures 6.7 x 6.3 x 1.8 mm.