This part is a kind of semiconductor called BCY58.

Function of this product has NPN switching transistors.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET M3D125 BCY58; BCY59 NPN switching transistors Product specification Supersedes data of September 1994 File under Discrete Semiconductors, SC04 1997 Jun 17 Philips Semiconductors Product specification NPN switching transistors FEATURES • Low current (max. 100 mA) • Low voltage (max. 45 V). APPLICATIONS • Switching and amplification. DESCRIPTION NPN switching transistor in a TO-18 metal package. PNP complements: BCY78 and BCY79. 3 BCY58; BCY59 PINNING PIN 1 2 3 emitter base collector, connected to case DESCRIPTION handbook, halfpage 1 3 2 MAM264 2 1 Fig.1 Simplified outline (TO-18) and symbol. QUICK REFERENCE DATA SYMBOL VCBO PARAMETER collector-base voltage BCY58 BCY59 VCEO collector-emitter voltage BCY58 BCY59 IC Ptot hFE collector cu [ ... ]

BCY58 PDF Datasheet Download