This part is a kind of semiconductor called 50N02-09.

Function of this product has SUB50N02-09.

Manufacturers : Vishay Siliconix

Image and pinout :

Some of the text within the PDF file :

SUD50N02-09P Vishay Siliconix N-Channel 20-V (D-S) 175_C MOSFET FEATURES PRODUCT SUMMARY VDS (V) 20 rDS(on) (W) 0.0095 @ VGS = 10 V 0.017 @ VGS = 4.5 V ID (A)a 20 15 D D D D TrenchFETr Power MOSFET 175_C Junction Temperature PWM Optimized for High Efficiency 100% Rg Tested APPLICATIONS D High-Side Synchronous Buck DC/DC Conversion − Desktop − Server D TO-252 Drain Connected to Tab G D S G Top View S N-Channel MOSFET Ordering Information: SUD50N02-09P SUD50N02-09PE3 (Lead Free) ABSOLUTE MAXIMUM RATINGS (TA = 25_C UNLESS OTHERWISE NOTED) Parameter Drain-Source Voltage Gate-Source Voltage Continuous Drain Currenta Pulsed Drain Current Continuous Source Current (Diode Conduction)a Avalanche Current Single Pulse Avalanche Energy Maximum Power Dissipation [ ... ]

50N02-09 PDF Datasheet Download