This part is a kind of semiconductor called BC171.

Function of this product has AMPLIFIER TRANSISTORS.

Manufacturers : Motorola

Image and pinout :

Some of the text within the PDF file :

BC174 BC171 BC172 CASE 29-02, STYLE 17 TO-92 (TO-226AA) AMPLIFIER TRANSISTORS NPN SILICON Refer to BC546 for graphs. MAXIMUM RATINGS Rating Collector-Emitter Voltage Collector-Base Voltage Emitter-Base Voltage Collector Current - Continuous @Total Device Dissipation T/ = 25°C Derate above 25°C @Total Device Dissipation Tc = 25°C Derate above 25°C Operating and Storage Junction Temperature Range THERMAL CHARACTERISTICS Characteristic Thermal Resistance, Junction to Case Thermal Resistance, Junction to Ambient Symbol VCEO VCBO VEBO ic PD pd Tj, T s tg Symbol Rwc Rfljc BC BC BC 174 171 172 65 45 25 80 50 30 6.0 100 350 2.8 1.0 8.0 -55 to +150 Max 125 357 Unit Vdc Vdc Vdc mAdc mW mW/°C Watt mW/°C °c Unit °C/W °c/w ELECTRICAL CHARACTERISTICS (TA = 25 °C unless otherwise noted) C [ ... ]

BC171 PDF Datasheet Download