This part is a kind of semiconductor called BC549C.

Function of this product has Si-Epitaxial PlanarTransistors.

Manufacturers : Diotec Semiconductor

Image and pinout :

Some of the text within the PDF file :

BC 546 ... BC 549 NPN Si-Epitaxial PlanarTransistors General Purpose Transistors NPN 500 mW TO-92 (10D3) 0.18 g Power dissipation – Verlustleistung Plastic case Kunststoffgehäuse Weight approx. – Gewicht ca. Plastic material has UL classification 94V-0 Gehäusematerial UL94V-0 klassifiziert Standard Pinning 1=C 2=B 3=E Standard packaging taped in ammo pack Standard Lieferform gegurtet in Ammo-Pack Maximum ratings (TA = 25/C) BC 546 Collector-Emitter-voltage Collector-Emitter-voltage Collector-Base-voltage Emitter-Base-voltage Power dissipation – Verlustleistung Collector current – Kollektorstrom (DC) Peak Coll. current – Kollektor-Spitzenstrom Peak Base current – Basis-Spitzenstrom Peak Emitter current – Emitter-Spitzenstrom Junction temp. – Sperrschichttemperatur Stor [ ... ]

BC549C PDF Datasheet Download