This part is a kind of semiconductor called FJV3101.

Function of this product has NPN Epitaxial Silicon Transistor.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

FJV3101R FJV3101R Switching Application (Bias Resistor Built In) • Switching circuit, Inverter, Interface circuit, Driver Circuit • Built in bias Resistor (R1=4.7KΩ, R2=4.7KΩ) • Complement to FJV4101R 3 2 1 SOT-23 1. Base 2. Emitter 3. Collector Equivalent Circuit C Marking R21 NPN Epitaxial Silicon Transistor R1 B R2 E Absolute Maximum Ratings Ta=25°C unless otherwise noted Symbol VCBO VCEO VEBO IC PC TJ TSTG Parameter Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current Collector Power Dissipation Junction Temperature Storage Temperature Value 50 50 10 100 200 150 -55 ~ 150 Units V V V mA mW °C °C Electrical Characteristics Ta=25°C unless otherwise noted Symbol BVCBO BVCEO ICBO hFE VCE(sat) fT Cob VI(off) VI(on) R1 R1/R2 Paramete [ ... ]

FJV3101 PDF Datasheet Download