JD54LS157SEA

Overview

The JD54LS157SEA is a high-reliability quad 2-input data selector/multiplexer manufactured by National Semiconductor. It utilizes LS-TTL technology and operates on a 5 V supply. The device features four independent multiplexers, each selecting one of two data inputs based on a common select line. It is housed in a hermetic ceramic flatpack package designed for military-grade environmental stability.

Feature Summary

• Provides four independent 2-to-1 multiplexing channels with a shared selection control
• Constructed using Low-power Schottky TTL logic for enhanced speed and reduced power consumption
• Engineered with hermetic sealing to ensure reliability in extreme temperature environments

Applications

• Military avionics signal routing systems
• Spacecraft telemetry data selection
• High-reliability industrial control interfaces

Procurement Notes

Verify the manufacturer origin carefully, as National Semiconductor was acquired by Texas Instruments. Confirm that the specific suffix 'SEA' denotes the correct hermetic ceramic flatpack variant required for your application. Ensure compliance with current export regulations and quality standards for aerospace or defense procurement.

Selection Notes

Select this component when military-grade radiation tolerance and thermal stability are mandatory. It serves as a direct functional replacement for standard commercial LS157 devices in ruggedized designs. Verify pin compatibility if substituting into existing PCB layouts originally designed for commercial grade parts.

Part Context

This part belongs to the SN54 series, which designates components qualified for the full military temperature range of -55 °C to +125 °C. Unlike the SN74 series intended for commercial use, the SN54 series ensures consistent performance under harsh operational conditions typical of defense and aerospace sectors.

Replacement Considerations

Public confirmed substitute part numbers: SN54LS157W, SN54LS157FA.