SN74ALS251N

Overview

The SN74ALS251N is an 8-to-1 data selector and multiplexer from the Texas Instruments SN74ALS series. It features three-state outputs for bus-oriented applications. The device operates within a supply voltage range of 4.5 V to 5.5 V. It utilizes a 16-pin DIP package suitable for through-hole mounting. The component supports standard TTL logic levels with defined low and high input thresholds.

Feature Summary

• Provides eight selectable data inputs routed to a single output
• Includes three-state output capability for direct bus interfacing
• Utilizes three address lines for channel selection
• Supports operation across standard commercial temperature ranges

Applications

• Data routing in digital communication systems
• Address decoding circuits
• Sequential logic control networks
• Multiplexing sensor data streams

Procurement Notes

Verify the specific suffix 'N' confirms the PDIP-16 through-hole package variant. Confirm RoHS compliance status via the official datasheet as requirements vary by manufacturing batch. Ensure the ordering part number matches the exact ALS series designation to avoid functional mismatches with other logic families.

Selection Notes

Select this component when an 8-channel multiplexer with three-state outputs is required. The ALS series offers improved speed over standard LS logic while maintaining compatible pinouts. Verify that the system voltage remains within the 4.5 V to 5.5 V operating range for reliable performance.

Part Context

This part belongs to the SN74ALS family, representing Advanced Low-power Schottky technology. It serves as a digital logic interface component for managing multiple data sources. The device integrates standard TTL-compatible inputs with high-speed switching characteristics typical of the ALS series architecture.

Replacement Considerations

Compatible substitutes include SN74ALS251DR or SN74ALS251NSR. Verify package compatibility between DIP and SOIC variants if physical footprint constraints exist. Ensure electrical parameters match the original design requirements.