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Product Detailed Parameters
- Description：IC MULTIPLEXER 1 X 8:1 16SO
- Series：74ALS
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Bulk
- Type：Multiplexer
- Circuit：1 x 8:1
- Independent Circuits：1
- Current - Output High, Low：2.6mA, 24mA
- Voltage Supply Source：Single Supply
- Voltage - Supply：4.5V ~ 5.5V
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Surface Mount
- Package / Case：16-SOIC (0.209", 5.30mm Width)
- Supplier Device Package：16-SO
- Grade：-
- Qualification：-
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Overview
The SN74ALS251NSR is a 1-of-8 data selector/multiplexer from the Texas Instruments ALS logic family. It features three-state outputs and operates on a single supply voltage of 4.5V to 5.5V. The device provides eight data inputs, three address inputs, and an enable input. It is housed in a 16-pin SOIC package with surface mount installation. Key electrical parameters include a high-level output current of 2.6mA and a low-level output current of 24mA.
Feature Summary
- Provides 1-of-8 data selection functionality for signal routing
- Features three-state outputs for bus-oriented systems
- Includes an enable input for controlled data transmission
Applications
- Data routing in digital communication systems
- Signal multiplexing in computer architectures
- Address decoding applications
Procurement Notes
Verify the specific suffix 'SR' indicates tape-and-reel packaging when sourcing. Confirm the ALS logic series compatibility with existing system voltage levels. Ensure the SOIC-16 footprint matches the target PCB design. Check RoHS compliance status through official manufacturer documentation before finalizing procurement.
Selection Notes
Select this component for applications requiring efficient 8-channel data switching within standard TTL voltage ranges. The ALS technology offers improved speed and power consumption compared to older LS series devices. Consider the three-state output capability if the design requires shared bus lines or multiple drivers.
Part Context
This part belongs to the SN74ALS541/251 family of bipolar logic ICs manufactured by Texas Instruments. The ALS (Advanced Low-power Schottky) series is designed for high-speed digital applications while maintaining lower power dissipation than standard TTL. The SN74ALS251 variant specifically addresses multiplexing needs.
Replacement Considerations
Compatible substitutes include other SN74ALS251 variants such as SN74ALS251N or SN74ALS251D, provided the package type and electrical characteristics match the original design requirements.
