100125DC

Overview

The MN54AC251-X is an 8-input multiplexer with tri-state outputs manufactured by National Semiconductor, now part of Texas Instruments. It belongs to the 54AC series, designed for military and aerospace applications requiring high reliability. The device features a single enable input that controls the output state, allowing multiple devices to be connected on a bus without interference. It supports wide supply voltage ranges and offers low power consumption typical of AC logic families.

Feature Summary

• Provides eight selectable data inputs routed to a single tri-state output
• Includes an active-low enable input for bus isolation control
• Designed for high-reliability environments including military and aerospace use
• Supports wide operating temperature ranges suitable for harsh conditions

Applications

• Military communication systems requiring signal routing
• Aerospace data acquisition and processing buses
• High-reliability industrial control systems
• Test and measurement equipment demanding precise signal selection

Procurement Notes

Verify the manufacturer designation carefully as National Semiconductor assets were acquired by Texas Instruments. Ensure the specific suffix matches the required environmental qualification. Confirm lead times due to potential legacy status. Check for available datasheets from TI archives. Validate package compatibility with existing board designs before ordering.

Selection Notes

Select this component when an 8-to-1 multiplexing function with tri-state capability is required in harsh environments. Consider the 54AC series specifications for voltage and speed requirements. Evaluate thermal management needs for military-grade operation. Compare against standard commercial variants if environmental ratings are not critical. Verify pinout compatibility with existing schematics.

Part Context

This part falls under the 54AC family of logic devices originally developed by National Semiconductor. These components are characterized for extended temperature ranges and enhanced radiation hardness compared to commercial equivalents. The transition to Texas Instruments has maintained the design specifications while updating documentation sources. Engineers often specify these parts for defense and space applications where reliability is paramount.

Replacement Considerations

Consider the 54AC251 or 54F251 from Texas Instruments as direct functional equivalents. Verify pin compatibility and electrical characteristics before substitution. Check for updated packaging options or lead-free compliance if required. Review TI datasheets for any minor parameter differences.