SN74HC157NSRG4

Overview

The SN74HC157NSRG4 is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 6V and supports an operating temperature from -40°C to +85°C. The device features four independent multiplexers controlled by a common address select input (A/B) and an active-low strobe input (G). Key electrical parameters include a typical propagation delay of 11ns at 5V, low power consumption with a maximum static current of 80µA, and output drive capabilities of ±6mA at 5V. It utilizes standard CMOS inputs with TTL-compatible thresholds.

Feature Summary

• Contains four independent 2-to-1 multiplexers sharing a single address select line for synchronized channel switching.
• Features an active-low strobe input that forces all outputs to a low state regardless of other input conditions.
• Provides TTL-compatible CMOS inputs designed to interface directly with standard logic families.

Applications

• Multiplexing and routing data between two source devices in system controllers.
• Switching 4-bit data buses between different peripheral components.
• Data selection circuits requiring common control signals for multiple channels.

Procurement Notes

Verify the specific ordering suffix 'SRG4' against the manufacturer's latest Package Option Addendum to confirm the tape-and-reel carrier type and lead finish specifications. Ensure the selected package variant matches the required thermal resistance and pin configuration for the target PCB layout. Cross-reference the RoHS status and material type listed in the official documentation prior to finalizing procurement orders.

Selection Notes

Select this component when a design requires four independent data paths controlled by a single address signal. Verify that the application load capacitance remains within the specified limits to maintain timing performance. Confirm that the supply voltage range aligns with the system's power rails and that the operating temperature range covers the environmental conditions of the intended deployment.

Part Context

This part belongs to the SNx4HC157 family of high-speed silicon gate CMOS multiplexers. The NS package designation indicates a Small Outline Package (SOP) variant. The device is functionally equivalent to other members of the HC series but offers specific packaging and manufacturing lot characteristics defined by the suffix codes.

Replacement Considerations

SN74HC157DR

FAQ

How does the strobe input affect the outputs?

When the strobe (G) input is held at a high level, it forces all four Y outputs to a low state, overriding the address select and data inputs.

What is the function of the A/B input?

The A/B input serves as the address select line. It determines which of the two data sources (A or B) is routed to the corresponding Y output for all four channels simultaneously.