DM54LS157J/883C

Overview

The DM54LS157J/883C is a military-grade quad 2-line to 1-line data selector/multiplexer manufactured by National Semiconductor. It utilizes LS-TTL technology and is housed in a 16-pin ceramic dual in-line package (CDIP). The device operates on a nominal 5 V supply with a maximum current consumption of 8 mA. It supports a maximum operating frequency of 30 MHz and functions within a temperature range of -55 °C to 125 °C. The component meets MIL-STD-883 Class C screening requirements.

Feature Summary

• Provides four independent 2-to-1 multiplexing channels for data selection
• Constructed using Low-power Schottky TTL logic for efficient power consumption
• Encapsulated in hermetic ceramic packaging suitable for harsh environments
• Complies with MIL-STD-883 Class C screening standards for reliability

Applications

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

Procurement Notes

Verify the specific revision level and screening class against the purchase order, as MIL-STD-883 variants may differ in test intensity. Confirm the ceramic package integrity and pin plating specifications to ensure compatibility with existing board layouts. Request full traceability documentation and lot history to validate compliance with defense procurement standards before finalizing acquisition.

Selection Notes

Select this component when high radiation tolerance and wide temperature stability are required for critical logic applications. The LS-TTL interface ensures compatibility with standard digital systems while offering lower power dissipation than standard TTL. The ceramic package provides superior environmental protection compared to plastic alternatives, making it suitable for long-duration missions or extreme operational conditions.

Part Context

This part belongs to the 54LS series of logic integrated circuits, designed for military and aerospace applications requiring extended temperature ranges and enhanced reliability. The 'J' suffix indicates a ceramic DIP package, while '/883C' denotes compliance with MIL-STD-883 Class C screening. It serves as a robust alternative to commercial-grade multiplexers in mission-critical electronic systems.

Replacement Considerations

Direct replacements include other 54LS157 variants from qualified manufacturers that meet MIL-STD-883 Class C specifications. Ensure any substitute maintains the same 16-pin CDIP footprint and LS-TTL electrical characteristics. Verify that the replacement part offers equivalent propagation delay and power consumption profiles to maintain system timing and thermal budgets.