JD54LS175SEA

Overview

The JD54LS175SEA is a military-grade D Flip-Flop manufactured by National Semiconductor. It contains four independent positive-edge triggered D flip-flops with separate clock inputs and active-low asynchronous clear inputs. The device utilizes TTL technology and operates on a nominal 5 V supply voltage. It is housed in a CDFP16 ceramic flatpack package, designed for high reliability in harsh environments. The component supports an extended temperature range from -55 °C to 125 °C, meeting MIL-STD-883 Class B screening requirements.

Feature Summary

• Four independent D flip-flops with positive-edge triggering
• Active-low asynchronous clear inputs for each flip-flop
• Military-grade reliability with MIL-STD-883 Class B screening
• Extended operating temperature range suitable for harsh environments

Applications

• Aerospace data storage systems
• Military communication equipment registers
• Avionics control logic circuits
• High-reliability industrial computing memory units

Procurement Notes

Verify the specific manufacturer source and lot traceability upon procurement. Ensure the component matches the JD54LS175SEA designation exactly, as suffixes may indicate different screening levels or package variants. Confirm that the MIL-STD-883 Class B certification documentation is provided with the shipment to validate military-grade quality standards and environmental testing compliance.

Selection Notes

Select this component when designing systems requiring robust, high-speed digital storage in extreme thermal conditions. The JD54LS175SEA is appropriate for applications where standard commercial parts fail due to temperature or vibration constraints. Its TTL interface ensures compatibility with existing military logic families, while the ceramic package provides superior hermetic sealing compared to plastic alternatives.

Part Context

This part belongs to the 54LS series of logic integrated circuits, which are characterized by low-power Schottky technology. The 54-series designation indicates military-grade specifications, distinguishing it from the commercial 74-series counterparts. As a D Flip-Flop, it serves as a fundamental building block for sequential logic circuits, enabling data retention and synchronization in complex digital architectures.

Replacement Considerations

Equivalent parts include the SN54LS175W and other 54LS175 variants from manufacturers such as Texas Instruments or NXP, provided they meet the same MIL-STD-883 Class B screening and CDFP16 package requirements. Verify pinout compatibility and electrical parameters before substitution.