This part is a kind of semiconductor called STC945.

Function of this product has General small signal Amplifier.

Manufacturers : AUK

Image and pinout :

Some of the text within the PDF file :

Semiconductor STC945 NPN Silicon Transistor Description • General small signal amplifier Features • Low collector saturation voltage : VCE(sat)=0.25V(Max.) • Low output capacitance : Cob=2pF(Typ.) • Complementary pair with STA733 Ordering Information Type NO. STC945 Marking STC945 Package Code TO-92 Outline Dimensions 3.45±0.1 4.5±0.1 2.25±0.1 unit : mm 4.5±0.1 0.4±0.02 2.06±0.1 14.0±0.40 1.27 Typ. 2.54 Typ. 1 2 3 1.20±0.1 PIN Connections 1. Emitter 2. Collector 3. Base 0.38 KST-9075-000 1 STC945 Absolute maximum ratings Characteristic Collector-Base voltage Collector-Emitter voltage Emitter-Base voltage Collector current Collector dissipation Junction temperature Storage temperature (Ta=25°C) Symbol VCBO VCEO VEBO IC PC Tj Tstg Ratings 50 40 5 150 625 [ ... ]

STC945 PDF Datasheet Download