This part is a kind of semiconductor called 40N10B.

Function of this product has N-CHANNEL MOSFET.

Manufacturers : CHONGQING PINGYANG

Image and pinout :

Some of the text within the PDF file :

40N10(F,B,H) 40A mps,100 Volts N-CHANNEL MOSFET FEATURE  40A,100V,RDS(ON)=40mΩ@VGS=10V/20A  Low gate charge  Low Ciss  Fast switching  100% avalanche tested  Improved dv/dt capability TO-220AB 40N10 ITO-220AB 40N10F TO-263 40N10B TO-262 40N10H Absolute Maximum Ratings(TC=25℃,unless otherwise noted) Parameter Symbol Drain-Source Voltage Gate-Source Voltage Continuous Drain Current Pulsed Drain Current(Note1) Single Pulse Avalanche Energy (Note 2) Avalanche Current(Note1) Repetitive Avalanche Energy (Note1) Reverse Diode dV/dt (Note 3) Operating Junction and Storage Temperature Range Maximum lead temperature for soldering purposes, 1/8"from case for 5 seconds VDSS VGSS ID IDM EAS IAR EAR dv/dt TJ,TSTG TL Mounting Torque 6-32 or M3 screw 40N10 100 ±20 40 1 [ ... ]

40N10B PDF Datasheet Download