JD54LS175SFA

Overview

The JD54LS175SFA is a military-grade quad D flip-flop manufactured by National Semiconductor, now part of Texas Instruments. It features four independent D-type flip-flops with separate clock inputs and active-low asynchronous clear inputs. The device operates within a supply voltage range of 4.5V to 5.5V. It utilizes a 16-pin ceramic dual in-line package (DIP) designed for high reliability in harsh environments. The component supports data storage and transfer applications requiring strict timing control and noise immunity.

Feature Summary

• Provides four independent D-type flip-flops with dedicated clock and clear inputs
• Features active-low asynchronous clear functionality for immediate state reset
• Constructed with robust ceramic packaging for enhanced environmental durability

Applications

• Military aerospace digital logic systems
• High-reliability data storage registers
• Industrial control sequence controllers

Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor assets were acquired by Texas Instruments. Confirm that the specific suffix 'JD' denotes the required military grade and ceramic package variant. Ensure compliance with current export regulations and quality standards associated with legacy defense components. Cross-reference the datasheet revision to match exact electrical specifications.

Selection Notes

Select this component when military-grade reliability and radiation hardness are critical requirements. The ceramic package offers superior thermal stability compared to plastic variants. Consider the 16-pin DIP footprint for compatibility with existing through-hole infrastructure. Evaluate the need for asynchronous clear functions in the system design before finalizing the selection.

Part Context

This part belongs to the 54LS series, representing the military version of the standard 74LS logic family. The 'J' indicates a ceramic package, while 'D' signifies the military temperature range. These components are designed for applications where standard commercial parts would fail due to extreme environmental conditions or stringent longevity requirements.

Replacement Considerations

The 54LS175N is the commercial plastic equivalent but lacks military certification. For direct replacement, verify if the system can tolerate the lower reliability rating. No other direct substitutes exist without modifying the board layout or logic levels.