CD4021BD3

Shift Registers Overview

The CD4021BD3 is a parallel-in serial-out shift register belonging to the Harris Corporation 4000/14000/40000 series. It features an 8-bit architecture with right-direction shifting capability and true output polarity. The device utilizes CMOS technology and is housed in a ceramic metal-sealed cofired DIP-16 package (CDIP16). It operates within a supply voltage range of 5V to 15V and supports a maximum operating frequency of 3 MHz at nominal supply conditions. The component is rated for military temperature grades, functioning reliably between -55 °C and +125 °C.

Shift Registers Feature Summary

• Parallel-to-serial data conversion functionality
• Rad-hardened construction for radiation tolerance
• Military-grade ceramic packaging

Shift Registers Applications

• Radiation-tolerant digital systems
• Military aerospace applications
• High-reliability data acquisition

Shift Registers Procurement Notes

Verify that the specific part number matches the required military qualification standards and ceramic package type. Confirm RoHS compliance status as indicated by manufacturer documentation. Ensure the supplier provides traceability for the rad-hard certification level. Check for any ordering suffixes that may affect pinout or electrical characteristics compared to standard commercial variants.

Shift Registers Selection Notes

Select this component when radiation hardness is mandatory for the application environment. The ceramic DIP-16 package offers superior thermal and mechanical stability compared to plastic alternatives. Verify that the 3 MHz maximum frequency meets the system clock requirements. Consider the 5V to 15V supply range compatibility with existing power rails before integration into the circuit design.

Shift Registers Part Context

This component is part of the Harris 4000 series logic family, specifically designed for high-reliability environments. It serves as a specialized variant of the standard CD4021 shift register, distinguished by its rad-hard processing and military-grade ceramic packaging. The device maintains functional compatibility with standard CMOS logic levels while providing enhanced durability against ionizing radiation exposure.

Shift Registers Replacement Considerations

The CD4021BFMSH is a confirmed substitute offering identical rad-hard specifications and ceramic DIP-16 packaging. Both components share the same 8-bit parallel-in serial-out functionality and military temperature ratings. Verify pinout compatibility and ensure the replacement meets the specific radiation tolerance requirements of the target application.