74AHCT257PW,118

Signal Switches, Multiplexers, Decoders Overview

The 74AHCT257PW,118 is a quad 2-input multiplexer with 3-state outputs manufactured by Nexperia. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL input levels. The device includes overvoltage tolerant inputs up to 5.5 V, Schmitt-trigger action on all inputs, and balanced propagation delays. It is housed in a TSSOP16 (SOT403-1) package with 16 leads and a body width of 4.4 mm. The component supports an operating temperature range from -40 °C to +125 °C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Quad 2-input multiplexer configuration with non-inverting data paths and 3-state outputs controlled by an active LOW enable signal.
• TTL-compatible input switching levels with overvoltage tolerance up to 5.5 V, facilitating use as translators in mixed voltage environments.
• Schmitt-trigger action on all inputs ensures high noise immunity and tolerance for slower input rise and fall times.
• CMOS low power dissipation characteristics with latch-up performance exceeding 100 mA per JESD 78 Class II Level A.

Signal Switches, Multiplexers, Decoders Applications

• Data routing in mixed voltage digital systems
• Signal selection in communication interfaces
• Bus arbitration circuits

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix matches the required package variant, as the PW suffix denotes the TSSOP16 plastic thin shrink small outline package. Confirm that the AHCT logic family requirement aligns with the system's TTL input level specifications rather than CMOS levels. Ensure the supply voltage constraints are strictly maintained between 4.5 V and 5.5 V to guarantee proper operation and avoid exceeding absolute maximum ratings.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-level control signals are required to drive a multiplexer in a 5 V environment. The 3-state output capability allows for direct connection to shared buses without additional buffering. Consider the TSSOP16 package dimensions if space constraints favor thin profiles over standard SOIC packages. Verify that the ESD protection requirements meet the specified HBM and CDM standards for the target application environment.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AHC/AHCT logic series, which provides high-speed CMOS performance with TTL compatibility for the AHCT variant. The 74AHCT257 is functionally equivalent to other quad 2-input multiplexers but distinguished by its specific input threshold voltages and overvoltage tolerance. It serves as a core building block for digital signal management in embedded systems and industrial control applications requiring reliable data path selection.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The 74AHC257PW,118 is the CMOS input version of the same functional device. While electrically similar in output behavior, it requires CMOS input levels rather than TTL levels. Designers must verify input voltage compatibility before substituting between AHC and AHCT variants to ensure correct logic threshold interpretation.