M3966m Mosfet Verified May 2026

Real-World Verification: In a 24V/8A synchronous buck prototype, the M3966M MOSFET climbed to only 62°C case temperature at 25°C ambient, well within spec.

Driven directly from a 3.3V or 5V microcontroller, the M3966M must have ( V_GS(th) ) below 1.5V. A verified unit will fully saturate at 3V logic. m3966m mosfet verified

Given the marking pattern, the part you are likely looking for is the AO4266 or M3966 (without the second M) from Alpha & Omega Semiconductor or a compatible Chinese clone. Driven directly from a 3

If you physically have the part, check the top marking: well within spec.

Using a square wave generator (10V amplitude, 100kHz) on the gate with a 100Ω resistor, observe the gate waveform on an oscilloscope. The Miller plateau should be visible at ~4-6V. A missing plateau suggests a damaged or counterfeit die.