This part is a kind of semiconductor called ST9012.

Function of this product has PNP Silicon Epitaxial Planar Transistor.

Manufacturers : SEMTECH

Image and pinout :

Some of the text within the PDF file :

ST 9012 PNP Silicon Epitaxial Planar Transistor for switching and amplifier applications. Especially suitable for AF-driver stages and low power output stages. The transistor is subdivided into three groups, G, H and I, according to its DC current gain. As complementary type the NPN transistor 9013 is recommended. 1. Emitter 2. Base 3. Collector TO-92 Plastic Package Absolute Maximum Ratings (Ta = 25 OC) Parameter Collector Base Voltage Collector Emitter Voltage Emitter Base Voltage Collector Current Power Dissipation Junction Temperature Storage Temperature Range Symbol -VCBO -VCEO -VEBO -IC Ptot Tj Tstg Value 40 30 5 500 625 150 - 55 to + 150 Unit V V V mA mW O C C O Characteristics at Ta = 25 OC Parameter DC Current Gain at -VCE = 1 V, -IC = 50 mA Current G [ ... ]

ST9012 PDF Datasheet Download