The 3DSD2G40VS5493 from 3D Plus is a Space Qualified Memory with Storage Capacity 64 Mb, Bit Size 64 Mbit 40-Bit, 64 Mbit 8-Bit, Radiation Dose 80 krad (Si) (Read Mode), 25 krad (Si) (Write Mode), Mass 8.5 gms, Voltage 3 to 3.6 V. More details for 3DSD2G40VS5493 can be seen below.