MM74HC4051M

Overview

The MM74HC4051M is an 8-channel analog multiplexer/demultiplexer implemented in advanced silicon-gate CMOS technology. It features bidirectional switches with low on-resistance and low off-leakage, utilizing linearization circuitry to enhance switch linearity. The device supports analog signals up to ±6V peak using digital control signals of 0 to 6V. It includes three supply pins (VCC, ground, VEE) for logic level translation and an inhibit control input. All inputs and outputs are protected against electrostatic discharge via diodes to VCC and ground.

Feature Summary

• Bidirectional switching capability allows any analog input to function as an output and vice versa.
• Integrated linearization circuitry reduces on-resistance variations and improves signal linearity.
• Logic level translation enables direct interfacing between 5V logic signals and ±5V analog signals.
• Built-in electrostatic discharge protection on all analog and digital terminals.

Applications

• Data acquisition systems requiring multi-channel signal routing
• Audio signal processing and switching applications
• Programmable gain amplifier front-ends

Procurement Notes

Verify the manufacturer origin carefully, as the MM prefix typically denotes Fairchild Semiconductor products. Confirm that the specific M suffix corresponds to the narrow SOIC package (M16A). Check for RoHS compliance status and ensure the component meets the required operating temperature range specifications before procurement.

Selection Notes

Select this component when an 8-channel single-ended analog multiplexer is required. Ensure the application voltage does not exceed the ±6V peak limit. Verify that the supply configuration matches the required analog input range. Consider the TSSOP or SOP packages if space constraints exist, though the M suffix specifically indicates the standard narrow SOIC form factor.

Part Context

This part belongs to the MM74HC405x series, which also includes the MM74HC4052 (dual 4-channel) and MM74HC4053 (triple 2-channel) variants. These devices share identical pinouts and core functionality but differ in channel count and internal switch grouping configurations.

Replacement Considerations

Direct pin-compatible replacements include the CD74HC4051M from Texas Instruments and the MC74HC4051 from ON Semiconductor. Verify electrical characteristics such as on-resistance and leakage current match the original design requirements.

FAQ

How does the device handle analog signals exceeding the digital logic voltage?

The device uses a separate VEE supply pin to allow analog input ranges up to ±6V while maintaining compatibility with 0 to 6V digital control signals.

What is the function of the Inhibit (INH) input?

When the Inhibit input is held HIGH, it disables all switches, forcing them into their OFF state regardless of the A, B, and C select lines.

Is the MM74HC4051M suitable for differential signaling?

No, the MM74HC4051M is designed for single-ended applications. Differential multiplexing requires the MM74HC4052, which contains two independent 4-channel sections.