This part is a kind of semiconductor called BF422.

Function of this product has NPN Silicon Transistors With High Reverse Voltage.

Manufacturers : Siemens Semiconductor Group

Image and pinout :

Some of the text within the PDF file :

NPN Silicon Transistors With High Reverse Voltage High breakdown voltage q Low collector-emitter saturation voltage q Low capacitance q Complementary types: BF 421, BF 423 (PNP) q BF 420 BF 422 2 3 1 Type BF 420 BF 422 Marking – Ordering Code Q62702-F531 Q62702-F495 Pin Configuration 1 2 3 E C B Package1) TO-92 Maximum Ratings Parameter Collector-emitter voltage Collector-emitter voltage RBE = 2.7 k Collector-base voltage Emitter-base voltage Collector current Peak base current Junction temperature Storage temperature range Thermal Resistance Junction - ambient Junction - case2) Rth JA Rth JC ≤ ≤ Symbol VCE0 VCER VCB0 VEB0 IC IBM Tj Tstg Values BF 420 – 300 300 Unit BF 422 250 – 250 5 50 100 830 150 – 65 … + 150 mW ˚C mA V Total power dissipation, TC = 88 ˚C Pto [ ... ]

BF422 PDF Datasheet Download