This part is a kind of semiconductor called 2N4401.

Function of this product has NPN General Purpose Amplifier.

Manufacturers : Micro Commercial Components

Image and pinout :

Some of the text within the PDF file :

MCC Features • •
  omponents 21201 Itasca Street Chatsworth    !"# $ %    !"# 2N4401 Through Hole Package Capable of 600mWatts of Power Dissipation NPN General Purpose Amplifier TO-92 Pin Configuration Bottom View C B E Electrical Characteristics @ 25°C Unless Otherwise Specified Symbol Parameter Collector-Emitter Breakdown Voltage* (I C=1.0mAdc, IB=0) Collector-Base Breakdown Voltage (I C=10mAdc, IE=0) Emitter-Base Breakdown Voltage (I E=0.1mAdc, IC=0) Base Cutoff Current (VCE=35Vdc, VBE=0.4Vdc) Collector Cutoff Current (VCE=35Vdc, VBE=0.4Vdc) DC Current Gain* (I C=0.1mAdc, VCE=1.0Vdc) (I C=1.0mAdc, VCE=1.0Vdc) (I C=10mAdc, VCE=1.0Vdc) (I C=150mAdc, VCE=1.0Vdc) (I C=500mAdc, VCE=1.0Vdc) Collector-Emitter Saturation Voltag [ ... ]

2N4401 PDF Datasheet Download