This part is a kind of semiconductor called 2SC2073.

Function of this product has NPN SILICON TRANSISTOR.

Manufacturers : Unisonic Technologies

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 2SC2073 Preliminary NPN EPITAXIAL SILICON TRANSISTOR NPN SILICON POWER TRANSISTORS  DESCRIPTION The UTC 2SC2073 is an NPN silicon power transistors, it uses UTC’s advanced technology to provide customers with high collector base voltage, etc. The UTC 2SC2073 is suitable for general purpose Power amplifier, vertical output application.  FEATURES * High collector base voltage  ORDERING INFORMATION Ordering Number Lead Free Halogen Free Package 2SC2073L- TA3-T 2SC2073G-TA3-T TO-220 Note: Pin Assignment: B: Base C: Collector E: Emitter Pin Assignment 123 BCE Packing Tube  MARKING www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd 1 of 3 QW-R221-021.a 2SC2073 Preliminary NPN EPITAXIAL SILICON TRANSISTOR  ABS [ ... ]

2SC2073 PDF Datasheet Download