SN74HCT157DRG4

Overview

The SN74HCT157DRG4 is a quadruple 2-input data selector/multiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL-voltage compatible inputs with buffered outputs. The device provides high-current output drive capabilities, supporting up to 15 LSTTL loads. Typical propagation delay is 15 ns at 5 V. It includes a separate strobe input for controlling data selection. The component is housed in a 16-pin SOIC package.

Feature Summary

• Contains four independent 2-to-1 data selectors
• TTL-compatible input logic levels
• High-current output drive capability
• Includes dedicated strobe control input

Applications

• Data routing between multiple sources
• Logic level translation from TTL to CMOS
• Bus-oriented switching applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm active production status and lead finish specifications. Ensure the selected variant matches the required operating temperature range and packaging format for your design constraints.

Selection Notes

Select this component when interfacing TTL logic with CMOS systems requiring high fan-out. The HCT series ensures compatibility with standard TTL voltage thresholds while providing the low power consumption benefits of CMOS technology. Verify that the load capacitance requirements align with the specified switching characteristics.

Part Context

This part belongs to the SN74HCT family of logic integrated circuits. It functions as a multiplexer, allowing the selection of one of two data inputs to be routed to a common output based on a select signal. The device is designed for general-purpose digital logic applications requiring reliable data switching.

Replacement Considerations

SN74HCT157D

FAQ

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

The G input acts as an enable/disable control. When G is high, the outputs are disabled regardless of the select input or data inputs.

How does the HCT series differ from HC series regarding inputs?

The HCT series features TTL-compatible input voltage thresholds, whereas the HC series uses CMOS-compatible thresholds.