Littelfuse — CPC3981Z MOSFET

Littelfuse has launched the CPC3981Z, an 800 V N-channel depletion-mode MOSFET with a novel pin arrangement that provides extended creepage distance in high-voltage applications.

A variation on the standard SOT-223 outline, the design of the CPC3981Z SOT-223-2L package removes a middle pin. This extends the drain-gate pin spacing from 1.386 mm to more than 4 mm. The longer creepage is beneficial in high-voltage applications such as switch-mode power supplies or power factor correction start-up circuits, because designers can avoid the need for costly conformal coating or potting while meeting the design requirement with a small, discrete device.

The increased distance between the depletion-mode MOSFET’s pins also simplifies the isolation management of wide input-voltage power supplies, and enables compact PCB layouts.

The 800 V blocking voltage rating of the CPC3981Z makes it the ideal choice for use in applications such as: