This part is a kind of semiconductor called BF422.

Function of this product has High Voltage Transistors(NPN).

Manufacturers : Motorola Inc

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by BF420/D High Voltage Transistors NPN Silicon COLLECTOR 2 3 BASE 1 EMITTER BF420 BF422 MAXIMUM RATINGS Rating Collector – Emitter Voltage Collector – Base Voltage Emitter – Base Voltage Collector Current Continuous Total Device Dissipation @ TA = 25°C Derate above 25°C Total Device Dissipation @ TC = 25°C Derate above 25°C Operating and Storage Junction Temperature Range Symbol VCEO VCBO VEBO IC PD PD TJ, Tstg BF420 300 300 5.0 500 625 5.0 1.5 12 – 55 to +150 BF422 250 250 Unit Vdc Vdc Vdc mAdc mW mW/°C Watts mW/°C °C 1 2 3 CASE 29–04, STYLE 14 TO–92 (TO–226AA) THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Symbol RqJA RqJC Max 200 [ ... ]

BF422 PDF Datasheet Download