This part is a kind of semiconductor called 2N4221.

Function of this product has N-Channel Silicon Junction Field-Effect Transistor.

Manufacturers : InterFET Corporation

Image and pinout :

Some of the text within the PDF file :

B-10 01/99 2N4220, 2N4220A, 2N4221, 2N4221A, 2N4222, 2N4222A N-Channel Silicon Junction Field-Effect Transistor ¥ ¥ ¥ ¥ Mixers Oscillators VHF Amplifiers Small Signal Amplifiers Absolute maximum ratings at TA = 25¡C Reverse Gate Source & Reverse Gate Drain Voltage Continuous Forward Gate Current Continuous Device Power Dissipation Power Derating (to 150 °C) – 30 V 10 mA 300 mW 2 mW/°C At 25°C free air temperature: Static Electrical Characteristics Gate Source Breakdown Voltage Gate Reverse Current Gate Source Voltage Gate Source Cutoff Voltage Drain Saturation Current (Pulsed) Dynamic Electrical Characteristics Common Source Forward Transconductance Common Source Forward Transmittance Common Source Output Conductance Common Source Input Capacitance Common Source Reverse Tran [ ... ]

2N4221 PDF Datasheet Download