STQ3N45K3-AP N-channel 450 V - 3.3 Ω typ., 0.6 A.
STMicroelectronics
STQ3N45K3-AP - N-channel Power MOSFET
STQ3N45K3-AP N-channel 450 V - 3.3 Ω typ., 0.6 A Zener-protected, SuperMESH3™ Power MOSFET in a TO-92 package Datasheet - production data Features 3.