SN74HC157N

Overview

The SN74HC157N is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments in a PDIP-16 package. 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 a strobe input (G). Key electrical specifications include a maximum propagation delay of 32ns at 6V, typical low power consumption of 80µA, and output drive capabilities of ±6mA at 5V.

Feature Summary

• Contains four independent 2-to-1 multiplexers with positive logic outputs
• Features a single address select input controlling all channels simultaneously
• Includes an active-low strobe input that forces all outputs to a low state

Applications

• Switching a 4-bit data bus between two source devices
• Routing data signals from multiple registers to a common output bus
• Function generation in digital signal processing circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm the exact package type, lead finish, and material compliance status. Ensure the selected variant matches the required thermal resistance and operating temperature range for the intended application environment.

Selection Notes

Select this component when a high-speed CMOS quad multiplexer with TTL-compatible inputs is required. Consider the PDIP-16 through-hole package for prototyping or applications requiring mechanical robustness. Verify that the system load capacitance remains within limits to maintain specified switching characteristics.

Part Context

This part belongs to the SNx4HC157 family of quadruple 2-line to 1-line data selectors. It is functionally compatible with other HC series logic but offers distinct packaging options including SOIC, SSOP, TSSOP, and CDIP variants. The N suffix specifically denotes the standard plastic dual-in-line package suitable for breadboard and perfboard integration.

Replacement Considerations

SN74HC157DR

FAQ

How does the strobe input affect the outputs?

When the strobe (G) input is held high, it forces all four Y outputs to a low state, regardless of the states of the address select or data inputs.

What happens to unused inputs on this device?

Unused inputs must be terminated to either VCC or ground to ensure proper operation. Leaving them floating can cause excessive power consumption and oscillations.