MOSFET

A MOSFET is an electronic switch for AEG-type airsoft guns. It routes current from the battery directly to the motor and protects the mechanical trigger contacts from damage caused by electrical arcing.

Why use a MOSFET?

When using 11.1V LiPo batteries without a MOSFET, the trigger contacts wear out quickly. The electric arc that forms when contacts separate causes them to burn. With an 11.1V battery, contacts without a MOSFET typically last only 6–12 months.

A MOSFET routes the high current away from the contacts. The trigger then switches only a signal current (milliamps), which eliminates arcing and extends the lifespan of the mechanism.

Types of MOSFETs

Major brands

GATE Titan/ASTER: A premium choice with Bluetooth connectivity and advanced features. The Titan has 5 optical sensors.

Perun Hybrid: The best value for money. Magnetic sensors are resistant to dust.

Jefftron Leviathan: Very fast trigger response (0.13 mm travel).

When is a MOSFET necessary?

With a 7.4V LiPo, a MOSFET is recommended but not essential. With 11.1V LiPo batteries, it is practically mandatory to preserve the lifespan of the gun.

For electric AEG guns with higher rate-of-fire demands or precise semi-auto shooting, a programmable MOSFET or ETU is a significant upgrade.

Related terms: AEG, mechabox, ETU, LiPo, trigger response