Extreme latchup susceptibility in modern commercial-off-the-shelf (COTS) monolithic 1m and 4M CMOS static random-access memory (SRAM) devices

Recent SEE testing of 1M and 4M monolithic SRAMs at Brookhaven National Laboratories has shown an extreme sensitivity to single-event latchup (SEL). We have observed SEL at the minimum heavy-ion LET available at Brookhaven, 0.375 MeV-cm/sup 2//mg.