This part is a kind of semiconductor called BCX38A.

Function of this product has NPN SILICON PLANAR MEDIUM POWER DARLINGTON TRANSISTORS.

Manufacturers : Zetex Semiconductors

Image and pinout :

Some of the text within the PDF file :

NPN SILICON PLANAR MEDIUM POWER DARLINGTON TRANSISTORS ISSUE 1 – MARCH 94 FEATURES * 60 Volt VCEO * Gain of 10K at IC=0.5 Amp * Ptot=1 Watt BCX38A/B/C C B E ABSOLUTE MAXIMUM RATINGS. PARAMETER Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Peak Pulse Current Continuous Collector Current Power Dissipation at Tamb=25°C Operating and Storage Temperature Range SYMBOL VCBO VCEO VEBO ICM IC Ptot Tj:Tstg 80 60 10 2 E-Line TO92 Compatible VALUE UNIT V V V A mA W °C 800 1 -55 to +200 ELECTRICAL CHARACTERISTICS (at Tamb = 25°C). PARAMETER Collector-Base Breakdown Voltage Collector-Emitter Sustaining Voltage Emitter-Base Breakdown Voltage Collector Cut-Off Current Emitter Cut-Off Current Collector-Emitter Saturation Voltage Base-Emitter Turn-on Voltage Static Forward [ ... ]

BCX38A PDF Datasheet Download