The UT8R512K8 from CAES is a Space Qualified Memory with Storage Capacity 512 Mb, Read Access Time 15 ns, Write Access Time 15 ns, Radiation Dose 100 krad(Si), 1.0E9 rad(Si)/sec (Upset), 1.0E11 rad(Si)/sec (Latchup), Mass 3.762 gms. More details for UT8R512K8 can be seen below.