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Rad Hard 256 Mb SDRAM 8-Meg X 8-Bit X 4-Banks Memory

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


Part Number(s): 48SD3208

DDC's Synchronous Dynamic Random Access Memory (SDRAM) is ideally suited for space applications requiring high performance computing and high density memory storage. As microprocessors increase in speed and demand for higher density memory escalates, SDRAM has proven to be the ultimate solution by providing bit-counts up to 256 Mega Bits and speeds up to 100 Megahertz. SDRAMs represent a significant advantage in memory technology over traditional SRAMs including the ability to burst data synchronously at high rates with automatic column-address generation, the ability to interleave between banks masking precharge time.

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


  • 256 Megabit ( 8-Meg X 8-Bit X 4-Banks)
  • RAD-PAK® radiation-hardened against natural space radiation
  • Total Dose Hardness:
    • >100 krad (Si), depending upon space mission
  • Excellent Single Event Effects:
    • SELTH >85 MeV/mg/cm2 @25°C
  • JEDEC Standard 3.3V Power Supply
  • Operating Current: 115 mA
  • Clock Frequency: 100 MHz Operation
  • Operating tremperature: -55 to +125 °C
  • Auto Refresh
  • Single pulsed RAS
  • 2 Burst Sequence variations
    • Sequential (BL =1/2/4/8)
    • Interleave (BL = 1/2/4/8)
  • Programmable CAS latency: 2/3
  • Power Down and Clock Suspend Modes
  • LVTTL Compatible Inputs and Outputs
  • Package: 72-Pin RAD-PAK® Flat Package




48SD3208 256 Mb SDRAM 8-Meg X 8-Bit X 4-Banks Data Sheet

 Application Note

Calculating the current consumption of an SDRAM

Introduction to Synchronous DRAM


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

Microelectronics Products List

DDC Custom Solutions Brochure

DDC Product Catalog

DDC Corporate Overview


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