MC74HC4051AD

Analog Switches, Multiplexers, Demultiplexers Overview

The MC74HC4051AD is a single-pole, eight-position analog multiplexer/demultiplexer manufactured by onsemi. It utilizes silicon-gate CMOS technology to achieve fast propagation delays and low ON resistance. The device features an analog power supply range (VCC – VEE) of 2.0 to 12.0 V and a digital control supply range (VCC – GND) of 2.0 to 6.0 V. It operates within a temperature range of -55°C to +125°C. Key electrical parameters include a maximum ON resistance of 100 Ω at VCC=6.0V, a channel-to-channel matching (ΔRon) of 10 Ω, and a maximum OFF leakage current of 1.0 μA. The package type is SOIC-16.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Utilizes silicon-gate CMOS technology for improved linearity and lower ON resistance compared to metal-gate counterparts.
• Provides diode protection on all inputs and outputs to guard against high static voltages.
• Features low crosstalk between switches and low noise performance suitable for precision analog applications.
• Control inputs are compatible with standard CMOS outputs and LSTTL outputs when pullup resistors are used.

Analog Switches, Multiplexers, Demultiplexers Applications

• Data acquisition systems requiring analog signal routing
• Audio and video signal switching applications
• Process control systems involving sensor multiplexing

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific ordering suffix to confirm the package type, as the base part number covers multiple configurations. The 'D' suffix indicates the SOIC-16 package. Confirm RoHS compliance status for the specific revision, as older manufacturing runs may differ from current production standards. Ensure the supply voltage constraints match the application requirements before procurement.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component when an 8-channel analog switch is required with a wide analog voltage swing capability up to 12V differential. Consider the HC4051A over HC4053A if a single common terminal is needed rather than three independent switches. Verify that the logic control levels are compatible with the system's digital supply voltage, as the device supports both CMOS and LSTTL interfaces.

Analog Switches, Multiplexers, Demultiplexers Part Context

The MC74HC4051AD belongs to the MC74HC405xA family of high-performance silicon-gate CMOS analog multiplexers. It is functionally pin-compatible with the older metal-gate MC14051AB series but offers superior speed and lower ON resistance. The device is designed to handle analog signals varying across the complete power supply range, making it versatile for various interface applications.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

MC74HC4051ADR2G

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the Enable pin affect the analog switches?

When the Enable pin is HIGH, all analog switches are turned off, isolating the common output/input from the selected channels. When LOW, the selected channel connects to the common terminal based on the A, B, and C select inputs.

What is the maximum analog input voltage range?

The analog input voltage can vary across the complete power supply range, from VEE to VCC. For example, with VCC=+5V and VEE=-5V, the analog signal can swing between -5V and +5V.

Are unused analog inputs/outputs required to be connected?

Unused analog inputs/outputs may be left floating. However, tying them to VCC or GND through a low-value resistor is recommended to minimize crosstalk and feedthrough noise picked up by the unused switch.