Data Bus

Motion Control

Power Control

Transformers, Inductors & Couplers

Rad-Tolerant Solutions

Custom Solutions



Rad Hard 16 Megabit (512K x 32-Bit) MCM SRAM Memory

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


Part Number(s): 89C1632

DDC’s 89C1632 high-performance 16 Megabit Multi-Chip Module (MCM) Static Random Access Memory features a greater than 100 krad (Si) total dose tolerance, depending upon space mission. The four 4-Megabit SRAM die and bypass capacitors are incorporated into a high-reliable hermetic quad flat-pack ceramic package. With high-performance silicon-gate CMOS technology, the 89C1632 reduces power consumption and eliminates the need for external clocks or timing strobes. It is equipped with output enable (OE) and four byte enable (CS1 - CS4) inputs to allow greater system flexibility. When OE input is high, the output is forced to high impedance.

DDC’s patented RAD-PAK® packaging technology incorporates radiation shielding in the microcircuit package. In a GEO orbit, RAD-PAK provides true greater than 100 krad (Si) total radiation dose tolerance, dependent upon space mission. 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 screening up to DDC’s self-defined Class K.


  • Four 512k x 8 SRAM architecture
  • RAD-PAK® technology hardens against natural space radiation technology
  • Total dose hardness:
    • >100 krad (Si), depending upon space mission
  • Excellent Single Event Effects:
    • SEL > 101MeV-cm2/mg
    • SEU threshold = 3 MeV-cm2/mg
    • SEU saturated cross section: 6E-9 cm2/bit
  • Package: 68-pin quad flat package
  • Fast access time: 20, 25 and 30 ns
  • Completely static memory - no clock or timing strobe required
  • Internal bypass capacitor
  • High-speed silicon-gate CMOS technology
  • 5V or 3V ± 10% power supply
  • Equal address and chip enable access times
  • Three-state outputs
  • All inputs and outputs are TTL compatible




89C1632 16 Megabit (512K x 32-Bit) MCM 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

 Generic Document

DDC Custom Solutions Brochure

DDC Product Catalog

DDC Corporate Overview


Ordering Information:

Request a Quote:

Click Here to Request a Quote