This part is a kind of semiconductor called 2N3771.

Function of this product has NPN PLANAR SILICON TRANSISTOR(AUDIO POWER AMPLIFIER DC TO DC CONVERTER).

Manufacturers : Wing Shing Computer Components

Image and pinout :

Some of the text within the PDF file :

2N3771 AUDIO POWER AMPLIFIER DC TO DC CONVERTER ! ! NPN PLANAR SILICON TRANSISTOR TO-3 High Current Capability High Power Dissipation ABSOLUTE MAXIMUM RATING (Ta=25℃) Characteristic Collector-Base Voltage Collector-Emitter Voltage Emitter-Base voltage Collector Current (DC) Collector Dissipation Junction Temperature Storage Temperature Symbol VCBO VCEO VEBO IC PC Tj Tstg Rating 50 40 6 30 150 150 -50~150 Unit V V V A W ℃ ℃ ELECTRICAL CHARACTERISTICS (Ta=25℃) Characterristic Collector Base Breakdown Voltage Collector Emitter Breakdown Voltage Emitter Base Breakdown Voltage Collector Cutoff Current Emitter Cutoff Current DC Current Gain Collector- Emitter Saturation Voltage Symbol BVCBO BVCEO BVEBO ICBO IEBO hFE1 VCE(sat) Test Condition IC=10 mA IE=0 IC=5 mA RBE=∞ IE=5 mA IC [ ... ]

2N3771 PDF Datasheet Download