DM54S251J-MIL

Overview

The DM54S251J-MIL is an 8-line to 1-line data selector/multiplexer from the National Semiconductor 54S series. It operates on a 5V supply with a range of 4.5V to 5.5V. The device features TTL logic compatibility and is housed in a 16-lead ceramic dual in-line package (CDIP). It supports an operating temperature range of -55°C to 125°C and meets MIL-STD-883 Class B (Modified) screening standards.

Feature Summary

• Provides 8-to-1 data selection capability using TTL-compatible inputs
• Constructed in hermetically sealed ceramic dual in-line packaging for durability
• Qualified for extended military-grade temperature environments
• Screened to MIL-STD-883 Class B (Modified) reliability standards

Applications

• Military aerospace signal routing systems
• High-reliability industrial control multiplexing
• Harsh environment data acquisition switching

Procurement Notes

Verify the specific suffix 'MIL' indicates MIL-STD-883 Class B (Modified) screening, as standard commercial variants lack this qualification. Confirm the CDIP package material is ceramic, not plastic, for thermal and hermetic requirements. Check for obsolete status implications regarding long-term availability and second-source alternatives. Ensure the supplier provides traceability documentation matching the military specification requirements.

Selection Notes

Select this component when 8-channel multiplexing is required in extreme temperature conditions where plastic packages fail. The 54S series offers faster propagation delays than standard 54LS counterparts but consumes more power. Verify that the system voltage remains within the 4.5V to 5.5V range to ensure logical high and low thresholds are met. Consider the physical size constraints of the 16-lead CDIP footprint during PCB layout.

Part Context

This part belongs to the National Semiconductor 54S family of Schottky TTL logic devices. The 54S designation indicates Schottky clamping diodes are used to prevent saturation, resulting in higher speed compared to standard TTL. The 'J' suffix denotes a ceramic DIP package, while 'MIL' specifies military screening. This family was designed for applications requiring robust performance in demanding environments.

Replacement Considerations

Direct substitutes include other 54S-series 8:1 multiplexers such as the DM54S251J or DM54S251W if package variations are acceptable. Verify pinout compatibility before substitution. Commercial equivalents like the SN74S251 may function electrically but lack the required temperature range and screening qualifications.