The 79LV2040B from Data Device Corporation is a Space Qualified Memory with Storage Capacity 512 Mb, Read Access Time 200 to 250 ns, Write Access Time 15 ms, Radiation Dose 10 krad, 25 krad, 40 krad, 60 krad, Voltage 3 to 3.6 V. More details for 79LV2040B can be seen below.