This part is a kind of semiconductor called STU03N20.

Function of this product has N-Channel Logic Level Enhancement Mode Field Effect Transistor.

Manufacturers : SamHop Microelectronics

Image and pinout :

Some of the text within the PDF file :

STU03N20 Sa mHop Microelectronics C orp. STD03N20Green Product Ver 1.0 N-Channel Logic Level Enhancement Mode Field Effect Transistor PRODUCT SUMMARY VDSS ID RDS(ON) (Ω) Max 200V 3.28 @ VGS=10V 2A 3.59 @ VGS=4.5V FEATURES Super high dense cell design for low RDS(ON). Rugged and reliable. TO-252 and TO-251 Package. G S STU SERIES TO - 252AA( D- PAK ) G DS STD SERIES TO - 251( I - PAK ) ABSOLUTE MAXIMUM RATINGS (TC=25°C unless otherwise noted) Symbol Parameter VDS Drain-Source Voltage VGS Gate-Source Voltage ID Drain Current-Continuous c IDM -Pulsed a c TC=25°C TC=70°C EAS Single Pulse Avalanche Energy d PD Maximum Power Dissipation TC=25°C TC=70°C TJ, TSTG Operating Junction and Storage Temperature Range THERMAL CHARACTERISTICS R JC Thermal Resistance, Junction [ ... ]

STU03N20 PDF Datasheet Download