DM54S158W-MIL

Overview

The DM54S158W-MIL is a military-grade quad 2-line to 1-line data selector/multiplexer manufactured by National Semiconductor. It operates on TTL technology and features four independent multiplexing functions, each selecting one of two inputs based on a common select line. The device utilizes a 16-lead ceramic flatpack (CDFP16) package designed for high reliability in harsh environments. It supports a nominal supply voltage of 5 V and is qualified under MIL-STD-883 Class C standards, ensuring operation within the -55 °C to 125 °C temperature range.

Feature Summary

• Military-grade construction with MIL-STD-883 Class C screening for enhanced reliability
• Quad configuration providing four independent 2-to-1 multiplexing channels
• TTL logic family compatibility with standard 5 V power supply requirements
• Hermetically sealed ceramic flatpack packaging for extreme environmental stability

Applications

• Military avionics signal routing systems
• Spacecraft data acquisition multiplexing
• High-reliability industrial control logic switching
• Defense communication equipment input selection

Procurement Notes

Verify that the component bears the correct manufacturer marking and date code consistent with National Semiconductor or Texas Instruments production history. Confirm the presence of MIL-STD-883 Class C screening documentation when sourcing from authorized distributors. Ensure the ceramic flatpack package integrity is intact, as thermal cycling can affect seal quality. Request full traceability records to validate military grade status and absence of counterfeit indicators before final procurement.

Selection Notes

Select this component when designing systems requiring certified military reliability and hermetic sealing for extreme temperature operations. It is appropriate for applications where TTL interface compatibility is mandatory alongside high-density signal routing. Consider the 16-lead ceramic flatpack form factor for board space constraints and thermal management needs. Evaluate alternative S-series parts if lower cost or non-hermetic packages are acceptable for less demanding environments.

Part Context

This part belongs to the National Semiconductor S-Series TTL logic family, specifically designed for high-speed digital switching applications. The DM54 prefix indicates military-grade qualification, distinguishing it from commercial variants like the DM74 series. It serves as a core building block for complex digital systems requiring robust data path management in defense and aerospace sectors.

Replacement Considerations

Direct substitutes include DM54S158J-MIL and DM54S158W. Verify pinout compatibility and electrical specifications match exactly before substitution. Non-military equivalents such as DM74S158N lack hermetic sealing and extended temperature ratings.