ST's rad-hard 54VCX logic series is specifically designed to cover hi-rel requirements and space applications. These HCMOS very low voltage bus interfaces are available with supply voltages from 1.65 V up to 3.6 V.
They offer excellent immunity to radiation up to 300 krad and are QML-V qualified. Operating temperature ranges from -55 to 150 °C.
They are available in Flat 48 packages.