4081BDMQB

Overview

The Fairchild Semiconductor 4081BDMQB is a standard static random-access memory (SRAM) device built using CMOS technology. It features a memory density of 1024 bits, organized as 256 words by 4 bits. The component utilizes parallel access and provides three-state output characteristics for efficient bus interfacing. Designed for military-grade reliability, it operates within an extended temperature range from -55 °C to +125 °C. The device is housed in a 22-pin ceramic dual in-line package (CDIP22) with tin-lead terminations.

Feature Summary

• Military-grade construction ensuring high reliability under extreme environmental conditions
• CMOS technology providing low power consumption and high noise immunity
• Three-state outputs facilitating direct connection to system data buses

Applications

• Military avionics systems requiring robust data storage
• Aerospace instrumentation and control units
• Harsh environment industrial computing applications

Procurement Notes

Verify the specific suffix 'Q' indicates compliance with MIL-STD-38535 or similar military screening standards. Confirm the CDIP22 package material and pin configuration match the target board layout. Ensure supply chain authenticity due to the specialized military classification and potential obsolescence status of legacy CMOS SRAM components.

Selection Notes

Select this component when military temperature ratings and radiation hardness are mandatory. Compare against commercial equivalents if cost reduction is prioritized over environmental resilience. Verify voltage compatibility with the host system's power rails and ensure interface timing meets the asynchronous operation requirements of the design.

Part Context

This part belongs to the broader family of CMOS SRAM devices used in critical infrastructure. It serves as a non-volatile-like temporary storage solution where data retention during power cycles is not required, but speed and reliability are paramount. The 256x4 organization suits small buffer applications in embedded controllers.

Replacement Considerations

Direct replacements include other manufacturers' versions of the 4081B series with military qualification. Verify pinout compatibility for the 22-pin DIP format. Cross-reference with equivalent parts from Texas Instruments or NXP that meet the same MIL-STD specifications.