This part is a kind of semiconductor called BCY79.

Function of this product has PNP switching transistors.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET M3D125 BCY78; BCY79 PNP switching transistors Product specification Supersedes data of September 1994 File under Discrete Semiconductors, SC04 1997 Jun 18 Philips Semiconductors Product specification PNP switching transistors FEATURES • Low current (max. 100 mA) • Low voltage (max. 45 V). APPLICATIONS • Switching and amplification. DESCRIPTION PNP switching transistor in a TO-18 metal package. NPN complements: BCY58 and BCY59. 3 BCY78; BCY79 PINNING PIN 1 2 3 emitter base collector, connected to case DESCRIPTION 1 handbook, halfpage 2 3 2 MAM263 1 Fig.1 Simplified outline (TO-18) and symbol. QUICK REFERENCE DATA SYMBOL VCBO PARAMETER collector-base voltage BCY78 BCY79 VCEO collector-emitter voltage BCY78 BCY79 IC Ptot hFE collector cur [ ... ]

BCY79 PDF Datasheet Download