SN74HCT157DR

Overview

The SN74HCT157DR is a quad 2-input data selector/multiplexer from the HCT logic family, manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features buffered inputs and outputs compatible with TTL voltage levels. The device provides high-current output drive capabilities up to 15 LSTTL loads. Typical propagation delay is 15 ns at 5 V. It includes a separate strobe input for controlling data routing.

Feature Summary

• TTL-voltage compatible inputs
• High-current output drive capability
• Low power consumption design

Applications

• Data selection circuits
• Multiplexing applications
• Logic interface buffering

Procurement Notes

Verify the specific ordering suffix 'DR' corresponds to the SOIC-16 package and tape-and-reel quantity of 2500 units. Confirm RoHS compliance status and lead finish details via the manufacturer's current packaging addendum before finalizing procurement specifications.

Selection Notes

Select this component when interfacing CMOS logic with TTL-compatible systems requiring a 5 V supply. Ensure the operating temperature range of -40°C to +85°C meets environmental requirements. Verify that the required propagation delay and output drive current align with system timing and load constraints.

Part Context

This part belongs to the SN74HCT series, designed for compatibility with standard TTL logic families while utilizing CMOS technology. The 'D' suffix indicates the SOIC-Narrow-16 package, and 'R' denotes reel packaging. It serves as a core building block for digital signal routing in mixed-logic environments.

Replacement Considerations

SN74HCT157DT (SOIC-16, tube)

FAQ

What is the function of the G (strobe) input?

The G input acts as an enable control; when high, it disables the outputs regardless of the select input state.

How does the A/B select input operate?

When low, it routes data from inputs A to the outputs; when high, it routes data from inputs B to the outputs.