This part is a kind of semiconductor called 2N4124.

Function of this product has NPN general purpose transistor.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

DISCRETE SEMICONDUCTORS DATA SHEET book, halfpage M3D186 2N4124 NPN general purpose transistor Product specification Supersedes data of September 1994 File under Discrete Semiconductors, SC04 1997 Mar 25 Philips Semiconductors Product specification NPN general purpose transistor FEATURES • Low current (max. 200 mA) • Low voltage (max. 25 V). APPLICATIONS • General purpose switching and amplification, e.g. small-signal audio-frequency applications. 1 handbook, halfpage 2N4124 PINNING PIN 1 2 3 collector base emitter DESCRIPTION DESCRIPTION NPN transistor in a TO-92; SOT54 plastic package. PNP complement: 2N4126. 2 3 1 2 3 MAM279 Fig.1 Simplified outline (TO-92; SOT54) and symbol. QUICK REFERENCE DATA SYMBOL VCBO VCEO ICM Ptot hFE fT PARAMETER collector-base voltage col [ ... ]

2N4124 PDF Datasheet Download