74FST3257QS

Overview

The onsemi 74FST3257QS is a quad 2:1 multiplexer/demultiplexer bus switch. It operates within a voltage range of 4.75V to 5.25V. The device is housed in a 16-QSOP package. It functions as a signal switch, encoder, decoder, and demultiplexer. The component is CMOS TTL compatible when operating between 4V and 5.5V.

Feature Summary

• Quad 2:1 multiplexer/demultiplexer architecture
• CMOS TTL compatibility for standard logic interfacing
• Bus switch functionality for signal routing

Applications

• Signal switching applications
• Multiplexer and demultiplexer circuits
• Encoder and decoder systems

Procurement Notes

Verify the specific suffix QS against the manufacturer datasheet to confirm pinout and electrical characteristics match system requirements. Confirm RoHS compliance status with the supplier. Check for obsolescence notices as lifecycle status may vary by region. Ensure the 16-QSOP package dimensions fit the PCB layout constraints before ordering.

Selection Notes

Select this component for designs requiring quad 2:1 signal routing at 5V logic levels. Verify that the supply voltage remains within the 4.75V to 5.25V operational window. Consider the 16-QSOP package size for space-constrained layouts. Ensure input signals are compatible with CMOS TTL thresholds for reliable operation.

Part Context

This part belongs to the 74FST logic family, designed for high-performance digital signal processing. It serves as a bus switch for managing data paths in electronic systems. The QS variant specifically denotes the 16-QSOP packaging option provided by onsemi for surface-mount assembly.

Replacement Considerations

Check for direct cross-references from Fairchild Semiconductor, now part of onsemi. Verify equivalent parts in the 74FST series with identical quad 2:1 MUX/DEMUX functionality and 16-QSOP packaging.