CD74HCT257M

Overview

The CD74HCT257M is a high-speed CMOS logic device manufactured by Texas Instruments, belonging to the HCT logic series. It functions as a quad 2-input multiplexer with three-state non-inverting outputs. The component is housed in a 16-SOIC surface-mount package and supports four independent circuits. It operates within a supply voltage range of 4.5 V to 5.5 V and features a propagation delay of 20 ns at 4.5 V with a 50 pF load. The device is rated for an operating temperature range from -55 °C to +125 °C.

Feature Summary

• Quad configuration providing four independent 2-to-1 data selectors or multiplexers within a single integrated circuit.
• Three-state output capability allows direct connection to bus structures without additional buffering hardware.
• Non-inverting output logic ensures signal polarity is maintained during selection and transmission processes.

Applications

• Data routing in digital communication systems requiring multiple input selection.
• Address decoding applications in microprocessor-based control architectures.
• Signal switching in test and measurement equipment interfaces.

Procurement Notes

Verify the specific suffix 'M' corresponds to the SOIC-16 surface-mount package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the selected distributor provides traceable origin data for quality assurance purposes.

Selection Notes

Select this component when a quad multiplexer with three-state outputs is required in a surface-mount design. The HCT series compatibility ensures logical interfacing with standard TTL-level inputs while maintaining CMOS power efficiency. Verify that the 16-SOIC footprint aligns with the target PCB layout constraints.

Part Context

This part belongs to the Texas Instruments 74HCT logic family, designed for high-speed operation with TTL-compatible input thresholds. The 74HCT257 series integrates multiple multiplexing functions into a compact form factor, serving as a foundational building block for complex digital logic circuits requiring efficient data path management.

Replacement Considerations

Publicly confirmed substitute part numbers include SN74HCT257DR and CD74HCT257E. These alternatives offer equivalent functional specifications but may differ in packaging style or manufacturing lot characteristics. Cross-reference datasheets to ensure pinout and electrical parameter compatibility before substitution.