74F157ASCX

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74F157ASCX is a high-speed quad 2-input multiplexer belonging to the F/FAST series. It features four independent data selectors, each capable of routing one of two logic inputs to a single true output based on common Select and Enable control signals. The device operates on a single power supply within the voltage range of 4.5V to 5.5V. It is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package with a standard 0.300-inch width. The component supports through-hole or surface-mount installation depending on the specific variant, though this model utilizes surface mount technology.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides four independent 2-to-1 data selection channels controlled by common select lines
• Features high-speed switching characteristics typical of the F/FAST logic family
• Includes active-low enable input for controlling data flow across all channels simultaneously

Signal Switches, Multiplexers, Decoders Applications

• Data routing in digital communication systems
• Address decoding in microprocessor-based designs
• Signal selection in test and measurement equipment

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify current availability status as this part may be obsolete. Confirm pinout compatibility with existing PCB layouts when sourcing equivalents. Ensure the replacement component matches the SOIC-16 package dimensions and electrical specifications exactly. Check manufacturer documentation for any changes in lead material or environmental compliance compared to original production batches.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for applications requiring fast switching speeds and multiple independent data paths. The quad configuration reduces board space compared to using individual multiplexers. Ensure the system voltage remains within the 4.5V to 5.5V range for reliable operation. Consider thermal dissipation requirements if operating at maximum load conditions in enclosed environments.

Signal Switches, Multiplexers, Decoders Part Context

This device is part of the widely used 74F157 logic family, known for its speed-performance balance in TTL-compatible circuits. It serves as a fundamental building block for digital signal processing tasks where multiple data sources must be monitored or switched efficiently. The F-series designation indicates faster propagation delays compared to standard 74LS variants.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The SN74F157AN from Texas Instruments is documented as a parameter-equivalent substitute. Verify that the alternative package type matches the assembly requirements if transitioning from DIP to SOIC or vice versa.