The 3D1D2G32TS2491 from 3D Plus is a Space Qualified Memory with Storage Capacity 64 Mb, Bit Size 64 Mbit 32-Bit, 64 Mbit 16-Bit, Radiation Dose 80 krad (Si) (Read Mode), 25 krad (Si) (Write Mode), Mass 4 gms, Voltage 2.3 to 2.7 V. More details for 3D1D2G32TS2491 can be seen below.