Cryogenic microelectronics, as used in focal plane arrays in space-bas
ed optical sensors, are potentially vulnerable to single event damage
effects from energetic heavy ions and protons. Results are presented f
or numerical simulation and analytical assessment of potential effects
in generic FPAs. Present-generation FPAs are not likely to be affecte
d by single event damage, but the potential will increase as minimum t
ransistor size is made smaller.