2N2221A, L, UA, UB & 2N2222A, L, UA, UB Radiation.
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2N2222UB - Radiation Hardened NPN Silicon Switching Transistors
2N2221A, L, UA, UB & 2N2222A, L, UA, UB Radiation Hardened NPN Silicon Switching Transistors Rev. V1 Features Qualified to MIL-PRF-19500/255 Le.