74AC251PC

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74AC251PC is an 8-input digital multiplexer with 3-STATE outputs housed in a 16-Lead Plastic Dual-In-Line Package (PDIP). It operates within a supply voltage range of 2.0V to 6.0V and supports an operating temperature range of -40°C to +85°C. The device features differential true and complementary outputs capable of sourcing or sinking 24 mA. Propagation delays from select inputs to output are typically 8.5 ns at 5.0V, while input-to-output delays are typically 7.0 ns.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides single-pole, 8-position switching capability controlled by three select inputs.
• Includes on-chip logic decoding for simplified interface requirements.
• Offers both true and complementary 3-STATE outputs for bus expansion compatibility.

Signal Switches, Multiplexers, Decoders Applications

• Universal function generator for logic functions of four variables
• Data routing and selection between multiple sources
• Bus expansion systems requiring high impedance state isolation

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package variant against the ordering code N16E to confirm the 16-Lead PDIP form factor. Ensure the design accommodates the AC series electrical characteristics rather than ACT specifications. Confirm that the application environment remains within the specified -40°C to +85°C operating temperature limits for reliable performance.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when an 8-channel multiplexer with tri-state control is required. The AC series offers higher speed compared to legacy counterparts but requires careful attention to input edge rates. Verify that the system power supply stays within the 2.0V to 6.0V range to maintain valid logic thresholds and prevent damage to the internal circuitry.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the 74AC family of high-speed CMOS logic devices originally manufactured by Fairchild Semiconductor. The 74AC251 specifically implements an 8-input multiplexer architecture. It serves as a standard solution for digital data selection tasks in general-purpose electronic circuits requiring robust signal integrity and flexible output configurations.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The 74ACT251PC is a compatible alternative within the same package offering TTL-compatible inputs. Designers must verify voltage level compatibility, as the ACT variant operates strictly between 4.5V and 5.5V, unlike the broader AC range.