MC74AC251N

Overview

The MC74AC251N is an octal multiplexer from the onsemi 74AC logic family, housed in a 16-pin PDIP package. It features a single 8-to-1 data selection circuit with three-state outputs. The device operates within a supply voltage range of 2 V to 6 V and supports propagation delays of 19 ns at 3.3 V and 14 ns at 5 V. It functions across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Provides 8-to-1 data selection capability through a single multiplexing channel
• Features three-state outputs for effective bus-oriented system integration
• Operates with a wide supply voltage range supporting 2 V to 6 V applications

Applications

• Data routing in digital communication systems
• Address decoding configurations
• Microprocessor peripheral interfacing

Procurement Notes

Verify the specific suffix 'N' confirms the PDIP-16 package variant when sourcing. Confirm RoHS compliance status as older PDIP variants may differ from modern reel-packaged equivalents. Ensure the operating temperature range meets environmental requirements. Cross-reference datasheet revision dates to confirm pinout consistency with existing designs.

Selection Notes

Select this component when an 8-channel multiplexer with high-speed CMOS performance is required. The AC series offers superior speed compared to standard HC logic while maintaining low power consumption. Verify that the 24 mA output drive capability satisfies load requirements. Consider the PDIP package constraints if surface-mount space is limited.

Part Context

This part belongs to the 74AC (Advanced CMOS) logic family, designed for high-speed digital switching. It serves as a functional equivalent to other industry-standard octal multiplexers but is optimized for onsemi's manufacturing processes. The device complements the broader 74AC portfolio used in general-purpose logic applications.

Replacement Considerations

The MC74AC251PC is a documented alternative offering identical functionality in a plastic DIP package. Verify package dimensions and pin compatibility before substitution. Other manufacturers produce functionally equivalent parts under different numbering schemes.