This part is a kind of semiconductor called BF393.

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 BF393/D High Voltage Transistor NPN Silicon COLLECTOR 3 2 BASE 1 EMITTER BF393 1 2 3 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 Value 300 300 6.0 500 625 5.0 1.5 12 – 55 to +150 Unit Vdc Vdc Vdc mAdc mW mW/°C Watts mW/°C °C CASE 29–04, STYLE 1 TO–92 (TO–226AA) THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Ambient Thermal Resistance, Junction to Case Symbol RqJA RqJC Max 200 83.3 Unit °C/W °C/ [ ... ]

BF393 PDF Datasheet Download