54AC244/SSA-R

Overview

The 54AC244/SSA-R is a dual 4-bit bus driver belonging to the AC series of high-speed CMOS logic functions. It features true outputs and is housed in a hermetic ceramic flatpack package with 20 pins, specifically designated as CDIP-20 or LCC-20 variants depending on the specific lead configuration. The device operates within a temperature range of -55 °C to +125 °C, ensuring reliability in demanding environments. As a component from Rochester Electronics, it represents a sourced version of original manufacturer designs, maintaining the functional specifications of the standard AC series bus drivers while adhering to military-grade packaging standards for radiation hardness and environmental stability.

Feature Summary

• Dual 4-bit non-inverting buffer architecture providing signal isolation and drive capability
• Hermetic ceramic packaging designed for extreme environmental conditions and radiation resistance
• High-speed CMOS technology compatible with standard AC series logic families
• Extended industrial and military temperature rating for robust operation

Applications

• Aerospace and defense systems requiring radiation-hardened logic components
• Military communication equipment operating in harsh thermal environments
• High-reliability data bus interfaces in satellite and space applications
• Industrial control systems demanding long-term stability and hermetic sealing

Procurement Notes

Verify the specific package variant (CDIP vs LCC) and suffix codes against official datasheets, as sourcing channels may list generic equivalents. Confirm radiation hardness qualifications if required for mission-critical aerospace applications. Ensure compatibility with existing board layouts regarding pinout definitions for the 20-pin flatpack format. Check for any specific handling instructions related to hermetic ceramic packages during assembly.

Selection Notes

Select this component when hermetic sealing and wide temperature operation are mandatory, distinguishing it from standard plastic-packaged AC series devices. Consider the dual 4-bit configuration for efficient bus management in complex digital systems. Evaluate the trade-off between the higher cost of hermetic packaging and the necessity for radiation tolerance in the target application environment.

Part Context

This part belongs to the broader 54AC244 family of octal bus buffers, adapted here into a dual 4-bit configuration within a specialized package. Rochester Electronics sources and qualifies these components from original manufacturers or surplus stock, ensuring they meet the electrical and mechanical specifications of the legacy 54AC series. The 'SSA' suffix typically denotes a specific hermetic ceramic flatpack variation used in military and aerospace contexts.

Replacement Considerations

Direct replacements include other hermetically sealed versions of the 54AC244 such as those from Texas Instruments or Intersil/Renesas in CDIP-20 packages. Verify that substitute parts maintain the same AC series speed grades and voltage ranges. Non-hermetic plastic equivalents like the SN74AC244 are functionally similar but lack the environmental ruggedness required for this specific part number.