54HC238FK/B

Overview

The 54HC238FK/B is a 3-to-8 line decoder and demultiplexer manufactured by Rochester Electronics, LLC. It belongs to the HC/UH series of CMOS logic devices. The component features asynchronous operation with negative edge triggering for its internal counter functions if applicable in broader contexts, though primarily defined as a decoder here. It is housed in a ceramic glass-sealed dual in-line package (CDIP) with 14 terminals. The device supports an operating temperature range from -55 °C to 125 °C, suitable for military and space-level applications. It includes load/preset inputs and operates in an asynchronous mode.

Feature Summary

• Provides decoding and demultiplexing functionality for three input lines to eight output lines
• Constructed using high-speed CMOS technology for low power consumption
• Utilizes a robust ceramic glass-sealed package designed for harsh environments
• Capable of interfacing with bus-organized systems through dedicated outputs

Applications

• Military avionics systems requiring radiation-hardened or high-reliability logic components
• Spacecraft telemetry and command data routing
• Industrial control systems operating in extreme temperature conditions
• Address decoding in memory structures for embedded systems

Procurement Notes

Verify the specific datasheet version and quality certification level required for your application, as Rochester Electronics supplies components under various qualification standards including MIL-PRF-38535. Confirm that the ceramic package type matches your board layout constraints. Ensure compatibility with your system's voltage levels and signal integrity requirements before finalizing procurement decisions.

Selection Notes

Select this component when high reliability and wide temperature tolerance are critical. The HC/UH series offers speed comparable to standard TTL but with lower power. Consider the CDIP package for superior environmental sealing compared to plastic variants. Evaluate pin-out compatibility if replacing legacy parts in existing designs without board modifications.

Part Context

Rochester Electronics specializes in sourcing and manufacturing obsolete and hard-to-find semiconductors. This part is often a continuation of original manufacturer designs, ensuring form, fit, and function remain consistent with historical specifications. The company maintains strict quality controls to meet aerospace and defense standards.

Replacement Considerations

Direct substitutes may include other 54HC238 variants from different manufacturers that meet the same electrical and mechanical specifications. Verify pin compatibility and logic truth tables before substitution. Alternative packages such as SOIC or PLCC may require adapter solutions if the ceramic DIP is unavailable.