This part is a kind of semiconductor called BC548.
Function of this product has NPN General Purpose Amplifier.
Manufacturers : Fairchild Semiconductor
Image and pinout :
Some of the text within the PDF file :
BC546 / BC547 / BC548 / BC549 / BC550 — NPN Epitaxial Silicon Transistor November 2014 BC546 / BC547 / BC548 / BC549 / BC550 NPN Epitaxial Silicon Transistor Features • Switching and Amplifier • High-Voltage: BC546, VCEO = 65 V • Low-Noise: BC549, BC550 • Complement to BC556, BC557, BC558, BC559, and BC560 1 TO-92 1. Collector 2. Base 3. Emitter Ordering Information Part Number BC546ABU BC546ATA BC546BTA BC546BTF BC546CTA BC547ATA BC547B BC547BBU BC547BTA BC547BTF BC547CBU BC547CTA BC547CTFR BC548BU BC548BTA BC548CTA BC549BTA BC549BTF BC549CTA BC550CBU BC550CTA Marking BC546A BC546A BC546B BC546B BC546C BC547A BC547B BC547B BC547B BC547B BC547C BC547C BC547C BC548 BC548B BC548C BC549B BC549B BC549C BC550C BC550C Package TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L TO-92 3L [ ... ]