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Rad Hard 4 Megabit (512K x 8-Bit) SRAM Memory

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


Part Number(s): 32C408B

DDC’s 32C408B high-speed 4 Megabit SRAM microcircuit features a greater than 100 krad (Si) total dose tolerance, depending upon space mission. Using RAD-PAK® packaging technology, the 32C408B realizes higher density, higher performance and lower power consumption, and is well suited for high-speed system application. Its fully static design eliminates the need for external clocks, while the CMOS circuitry reduces power consumption and provides higher reliability. The 32C408B is equipped with eight common input/output lines, chip select and output enable, allowing for greater system flexibility and eliminating bus contention.

DDC's patented RAD-PAK packaging technology incorporates radiation shielding in the microcircuit package. In a GEO orbit, RAD-PAK can provide true greater than 100 krad (Si) total radiation dose tolerance; dependent upon space mission. The patented radiation-hardened RAD-PAK 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 a space mission. This product is available with packaging and screening up to Class S.


  • 512k x 8-bit CMOS architecture
  • RAD-PAK® technology hardened against natural space radiation
  • Total dose hardness:
    • >100 krad (Si), depending upon space mission
  • Single event effect:
    • SELTH: > 68 MeV/mg/cm2
    • SEUTH: < 3MeV/mg/cm2
    • SEU saturated cross section: 6E-9 cm2/bit
  • Package:
    • 36 pin RAD-PAK® flat pack
  • Fast propagation time:
    • 20, 25, 30 ns maximum access time
  • Single 5V + 10% power supply
  • Low power dissipation:
    • Standby: 60mA (TTL); 10mA (CMOS)
    • Operating: 180 mA (20 ns); 170 mA (25 ns); 160 mA (30 ns)
  • TTL compatible inputs and outputs
  • Fully static operation
    • No clock or refresh required
  • Three state outputs




32C408B 4 Megabit (512K x 8-Bit) SRAM Data Sheet


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

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DDC Custom Solutions Brochure

DDC Product Catalog

DDC Corporate Overview


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