MC74ACT157N

Overview

The MC74ACT157N is a quad 2-input multiplexer from the 74ACT logic series, manufactured by onsemi. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL-compatible inputs. The device provides four outputs that present selected data in true form, controlled by common Select and active-LOW Enable inputs. It supports output currents of ±24 mA and functions as a high-speed switching component or function generator.

Feature Summary

• TTL-compatible input thresholds for direct interfacing with standard logic families
• Quad configuration allowing selection of four bits from two independent sources
• Active-LOW enable control forces all outputs low when deactivated

Applications

• Moving data between two groups of registers to common output buses
• Implementing gating functions using variable common logic
• Function generation utilizing sixteen different two-variable combinations

Procurement Notes

Verify the specific package suffix 'N' corresponds to the PDIP-16 housing required for your assembly process. Confirm RoHS compliance status through official documentation if environmental regulations apply. Ensure the operating temperature range meets system requirements, as specifications vary between ambient and extended limits.

Selection Notes

Select this component when TTL-level input compatibility is necessary alongside CMOS drive strength. The 74ACT series bridges the gap between older TTL standards and modern CMOS performance. Verify that the 5V supply constraint aligns with the target circuit design before finalizing the part choice.

Part Context

This device belongs to the MC74AC/ACT157 family of quad multiplexers. The ACT variant specifically denotes TTL-compatible inputs while maintaining AC-series speed characteristics. It serves as a logical implementation of a 4-pole, 2-position switch controlled by external logic levels.

Replacement Considerations

MC74AC157N