2N5551HR - Hi-Rel NPN bipolar transistor
This bipolar transistor is able to operate under severe environment conditions and radiation exposure providing high immunity to total ionizing dose (TID).
All part numbers are guaranteed up to 100 krad with low dose rate at 0.1 rad/s as per ESCC 22900.
Qualified as per ESCC 5201/019 and MIL-PRF-195