55ALS194/BEA

Overview

The Rochester Electronics LLC 55ALS194/BEA is a high-speed ECL-compatible 4-bit universal shift register belonging to the 54/55ALS series. It features parallel and serial data loading capabilities with independent bidirectional shift control. The device operates within a military temperature range of -55 °C to 125 °C and utilizes a 16-lead ceramic dual in-line package (CDIP). Key electrical characteristics include a supply voltage range of 4.75 V to 5.25 V, low power dissipation typical of ALS logic, and tri-state outputs for bus driving applications.

Feature Summary

• Supports parallel load and bidirectional serial shift operations
• Features tri-state outputs for efficient bus interfacing
• Constructed with ceramic metal-sealed packaging for harsh environments

Applications

• Military communication systems requiring high reliability
• Data acquisition systems with strict environmental tolerances
• Industrial control units operating in extreme temperatures

Procurement Notes

Verify component authenticity through manufacturer documentation or authorized distributors. Confirm lead-free status and RoHS compliance as these may vary by production batch. Ensure the CDIP-16 package matches the target footprint. Validate that the specific suffix corresponds to the required military grade specifications before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring certified military-grade shift registers. The 55ALS194/BEA is suitable for applications needing fast switching speeds combined with low power consumption. Consider the ceramic package for superior thermal stability compared to plastic alternatives in high-vibration or high-temperature scenarios.

Part Context

This part belongs to the 54/55ALS family, which offers improved speed-power product over standard TTL. The 55ALS194 variant specifically provides versatile shifting functions. Rochester Electronics sources and tests these components to meet original military datasheet specifications, ensuring compatibility with legacy defense and aerospace designs.

Replacement Considerations

Direct replacements include other 55ALS194 variants from qualified manufacturers. Verify pinout compatibility and electrical parameters such as propagation delay and output drive current. Ensure the substitute component meets the same MIL-PRF-38535 quality standards if used in regulated military applications.