Data Bus

Motion Control

Power Control

Transformers, Inductors & Couplers

Rad-Tolerant Solutions

Custom Solutions



Rad Hard 20 Megabit (512K x 40-Bit) Low Voltage EEPROM MCM Memory

Discontinued Product. Please contact the factory for the latest replacement.


Part Number(s): 79LV2040

DDC’s 79LV2040 multi-chip module (MCM) memory features a greater than 100 krad (Si) total dose tolerance, dependent upon orbit. Using DDC’s patented radiation-hardened RADPAK ® MCM packaging technology, the 79LV2040 is the first radiation-hardened 20 megabit MCM EEPROM for space application. The 79LV2040 uses twenty 1 Megabit high speed CMOS EEPROM die to yield a 20 megabit product. The 79LV2040 is capable of in-system electrical byte and page programmability. It has a 128 x 40 page programming function to make the erase and write operations faster. It also features Data Polling and a Ready/Busy signal to indicate the completion of erase and programming operations. In the 79LV2040, hardware data protection is provided with the RES pin, in addition to noise protection on the WE signal and write inhibit on power on and off. Software data protection is implemented using the JEDEC optional standard algorithm.

DDC's patented RAD-PAK® packaging technology incorporates radiation shielding in the microcircuit package. It eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or space mission. In a GEO orbit, RAD-PAK provides greater than 100 krad (Si) radiation dose tolerance. This product is available with screening up to DDC’s self-defined Class K.


  • 512k x 40-bit EEPROM MCM
  • RAD-PAK® radiation-hardened against natural space radiation
  • Total dose hardness:
    • >100 krad (Si)
    • Dependent upon orbit
  • Excellent Single event effects
    • SELTH > 84 MeV/mg/cm2
    • SEU ~ 26 MeV/mg/cm2 read mode
    • SEU Staurated Cross Section ~ 2X10-12cm2Bit (Read Mode)
    • SEU = 11 MeV/mg/cm2 write mode
    • SEU Staurated Cross Section ~ 6X10-9cm2/Bit (Write Mode)
  • High endurance
    • 10,000 cycles (Page Programming Mode)
    • 10 year data retention
  • Page Write Mode: 128 Dword Page
  • High Speed:
    • 200 and 250 ns maximum access times
  • Automatic programming
    • 15 ms automatic Page/Dword write
  • Low power dissipation
    • 100 mW/MHz active current
    • 1.5 mW standby current




79LV2040 20 Megabit (512K x 40-Bit) Low Voltage EEPROM MCM Data Sheet

 Application Note

EEPROM Frequently Asked Questions


How Rad Hard Do You Need? The Changing Approach To Space Parts Selection?

Proton Transport An Examination of Model and Experimental Data For Space Environment Protons

 Generic Document

DDC Custom Solutions Brochure

DDC Product Catalog

DDC Corporate Overview


Ordering Information:

Request a Quote:

Click Here to Request a Quote