This part is a kind of semiconductor called BC558.

Function of this product has PNP Epitaxial Silicon Transistor.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

BC556 / BC557 / BC558 / BC559 / BC560 — PNP Epitaxial Silicon Transistor January 2016 BC556 / BC557 / BC558 / BC559 / BC560 PNP Epitaxial Silicon Transistor Features • Switching and Amplifier • High-Voltage: BC556, VCEO = -65 V • Low-Noise: BC559, BC560 • Complement to BC546, BC547, BC548, BC549, and BC550 123 Straight Lead Bulk Packing TO-92 1. Collector 12 3 2. Base 3. Emitter Bent Lead Tape & Reel Ammo Packing Ordering Information Part Number BC556ABU BC556ATA BC556BTA BC556BTF BC556BTFR BC557ATA BC557BTA BC557BTF BC558BTA BC559BTA BC559CTA BC560CTA Marking BC556A BC556A BC556B BC556B BC556B BC557A BC557B BC557B BC558B BC559B BC559C BC560C Package TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L Packing Me [ ... ]

BC558 PDF Datasheet Download