This part is a kind of semiconductor called 2N2222A.

Function of this product has Radiation Hardened NPN Silicon Switching Transistors.

Manufacturers : MA-COM

Image and pinout :

Some of the text within the PDF file :

2N2221A, L, UA, UB & 2N2222A, L, UA, UB Radiation Hardened NPN Silicon Switching Transistors Rev. V1 Features  Qualified to MIL-PRF-19500/255  Levels JANSM-3K Rads (Si) JAN JANSD-10K Rads (Si) JANTX JANSP-30K Rads (Si) JANTXV JANSL-50K Rads (Si) JAN JANSR-100K Rads (Si)  TO-18 (TO-206AA), Surface mount UA & UB Packages Applications  Switching and Linear Applications  DC and VHF Amplifier Applications Electrical Specifications @ TA = 25°C Parameter Test Conditions Symbol Units Minimum Maximum Off Characteristics: Collector - Emitter Breakdown IC = 10 mAdc V(BR)CEO Vdc 50 — Collector - Base Cutoff Current Emitter - Base Cutoff Current VCB = 75 Vdc VCB = 60 Vdc VEB = 6.0 Vdc VEB = 4.0 Vdc ICBO1 ICBO2 IEBO1 IEBO2 µAdc nAdc µAdc nAdc — — 10 10 10 10 [ ... ]

2N2222A PDF Datasheet Download