DM54S157J-MIL

Overview

The DM54S157J-MIL is a high-speed Schottky TTL quad 2-input multiplexer manufactured by National Semiconductor. It features four independent data selectors in a 16-pin ceramic dual in-line package (CDIP). The device operates with a nominal supply voltage of 5 V and supports an extended temperature range from -55 °C to +125 °C. It includes an active-low enable input for controlling data flow. The component is qualified under MIL-STD-883 Class B standards, ensuring reliability for military applications.

Feature Summary

• Provides four independent 2-to-1 data selection channels within a single integrated circuit
• Features active-low enable control to manage data transmission across all channels simultaneously
• Constructed with hermetic ceramic packaging designed for harsh environmental conditions

Applications

• Military avionics signal routing systems
• Spacecraft telemetry data selection circuits
• Harsh environment industrial control logic interfaces

Procurement Notes

Verify that the received unit matches the exact part number DM54S157J-MIL, as suffixes indicate specific qualification levels. Confirm the presence of MIL-STD-883 Class B screening documentation upon delivery. Ensure the ceramic package integrity is intact, as damage compromises hermeticity. Check for lead plating specifications consistent with the J suffix designation. Validate that the manufacturer source is authorized for military-grade components.

Selection Notes

Select this component when radiation hardness or extreme temperature stability is required for digital signal switching. Compare propagation delay characteristics against standard commercial variants if speed is critical. Ensure the system design accommodates the open-collector output requirements typical of S-TTL families. Verify power supply decoupling meets the high-frequency noise immunity needs of Schottky logic. Consider pin compatibility with existing board layouts designed for 16-pin DIP packages.

Part Context

This device belongs to the DM54S series, representing high-speed Schottky TTL logic functions produced by National Semiconductor. The 'MIL' suffix denotes military qualification, distinguishing it from commercial grade parts. It shares functional similarities with other quad multiplexers but offers enhanced durability. The series was widely used in defense electronics before transitioning to newer technologies.

Replacement Considerations

Direct replacements include the DM54S157W/883 for flatpack configurations or the DM54S157J without the MIL suffix for non-screened requirements. Cross-reference with DM54LS157J for lower power consumption, noting potential speed differences. Verify pinout compatibility before substituting with generic equivalents.