This part is a kind of semiconductor called 45H11.

Function of this product has MJD45H11.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

MJD44H11 (NPN) MJD45H11 (PNP) Preferred Device Complementary Power Transistors DPAK For Surface Mount Applications Designed for general purpose power and switching such as output or driver stages in applications such as switching regulators, converters, and power amplifiers. Features http://onsemi.com • Pb−Free Packages are Available • Lead Formed for Surface Mount Application in Plastic Sleeves • Straight Lead Version in Plastic Sleeves (“−1” Suffix) • Lead Formed Version in 16 mm Tape and Reel for Surface Mount • • • • • • (“T4” Suffix) Electrically Similar to Popular D44H/D45H Series Low Collector Emitter Saturation Voltage − VCE(sat) = 1.0 Volt Max @ 8.0 Amperes Fast Switching Speeds Complementary Pairs Simplifies Designs Epoxy Meets UL 94, V−0 @ 0 [ ... ]

45H11 PDF Datasheet Download