This part is a kind of semiconductor called BDX65A.

Function of this product has NPN SILICON DARLINGTONS POWER TRANSISTOR.

Manufacturers : Comset Semiconductors

Image and pinout :

Some of the text within the PDF file :

BDX65 – A – B – C NPN SILICON DARLINGTON POWER TRANSISTOR The BDX65, BDX65A, BDX65 and BDX65C are mounted in TO-3 metal package. High current power darlingtons designed for power amplification and switching applications. The complementary PNP are BDX64, BDX64A, BDX64B, BDX64C. Compliance to RoHS. ABSOLUTE MAXIMUM RATINGS Symbol Ratings BDX65 BDX65A BDX65B BDX65C BDX65 BDX65A BDX65B BDX65C Value 60 80 100 120 80 100 120 140 5.0 12 16 0.2 117 -55 to +200 Unit VCEO Collector-Emitter Voltage V VCBO VEBO IC IB PT TJ TS Collector-BaseVoltage www.DataSheet.net/ V V A A W °C Emitter-Base Voltage Collector Current Base Current Power Dissipation Junction Temperature Storage Temperature IC(RMS) ICM @ TC = 25° THERMAL CHARACTERISTICS Symbol RthJ-C Ratings Thermal Resistance, Junc [ ... ]

BDX65A PDF Datasheet Download