This part is a kind of semiconductor called W14NC50.

Function of this product has STW14NC50.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

N-CHANNEL 500V - 0.31Ω - 14A TO-247 PowerMesh™II MOSFET TYPE STW14NC50 s s s s s STW14NC50 VDSS 500V RDS(on) < 0.38Ω ID 14 A TYPICAL RDS(on) = 0.31Ω EXTREMELY HIGH dv/dt CAPABILITY 100% AVALANCHE TESTED NEW HIGH VOLTAGE BENCHMARK GATE CHARGE MINIMIZED 1 3 2 DESCRIPTION The PowerMESH™II is the evolution of the first generation of MESH OVERLAY™. The layout refinements introduced greatly improve the Ron*area figure of merit while keeping the device at the leading edge for what concerns switching speed, gate charge and ruggedness. APPLICATIONS SWITCH MODE POWER SUPPLIES (SMPS) s HIGH CURRENT, HIGH SPEED SWITCHING s DC-AC CONVERTERS FOR WELDING EQUIPMENT AND UNINTERRUPTIBLE POWER SUPPLIES AND MOTOR DRIVE s TO-247 INTERNAL SCHEMATIC DIAGRAM ABSOLUTE MAX [ ... ]

W14NC50 PDF Datasheet Download