This part is a kind of semiconductor called 17NF25.

Function of this product has STI17NF25.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

STI17NF25 - STD17NF25 STF17NF25 - STP17NF25 N-channel 250V - 0.14Ω - 17A - TO-220/FP - DPAK - I2PAK Low gate charge STripFET™ II Power MOSFET General features Type STD17NF25 STI17NF25 STF17NF25 STP17NF25 VDSS 250V 250V 250V 250V RDS(on) < 0.165Ω < 0.165Ω < 0.165Ω < 0.165Ω ID 17A 17A 17A 17A PTOT 90W 90W 25W 90W ■ Low gate charge ■ 100% avalanche tested ■ Exceptional dv/dt capability Description This Power MOSFET series realized with STMicroelectronics unique STripFET™ process has specifically been designed to minimize input capacitance and gate charge. It is therefore suitable as primary switch in advanced highefficiency isolated DC-DC converters. Applications ■ Switching applications 3 2 1 TO-220 123 I²PAK 3 2 1 TO-220FP 3 1 DPAK Internal schematic diagr [ ... ]

17NF25 PDF Datasheet Download