MC74LVXT4066M

Overview

The MC74LVXT4066M is a quad analog switch manufactured by onsemi using silicon-gate CMOS technology. It operates within a power supply voltage range of 2.0 V to 5.5 V and supports an analog input voltage range from GND to VCC. The device features four independent bilateral switches with a maximum ON resistance (Ron) of 30 Ω at VCC = 5.5 V and 25°C. Propagation delays are typically 1.0 ns to 2.0 ns for analog input-to-output transitions, depending on the supply voltage. The component provides low off-channel leakage current (1.0 μA max at VCC = 5.5 V) and high bandwidth (160 MHz at VCC = 5.5 V). It includes diode protection on all inputs and outputs, allowing overvoltage tolerance up to 7.0 V regardless of the supply voltage.

Feature Summary

• Utilizes silicon-gate CMOS technology for fast switching speeds and linear ON resistance characteristics across the full power-supply range.
• Provides digital input protection allowing operation with control voltages up to 7.0 V, enabling logic-level translation between different voltage domains.
• Features low crosstalk and feedthrough noise, ensuring signal integrity in multiplexing applications.

Applications

• Logic level shifting between 1.8 V, 3.0 V, and 5.0 V CMOS logic families.
• Multiplexer and demultiplexer configurations for analog and digital signal routing.
• Sample-and-hold amplifier circuits requiring precise signal gating.

Procurement Notes

Verify the specific package suffix required for the design, as the MC74LVXT4066 series is available in SOIC-14 NB and TSSOP-14 packages. Confirm RoHS compliance status and Pb-free marking requirements during sourcing. Check for discontinuation notices or obsolescence alerts directly from the manufacturer before finalizing procurement plans.

Selection Notes

Select this component when interfacing circuits with varying supply voltages, such as translating signals between 1.8 V and 5.0 V domains. Ensure the application does not exceed the maximum static voltage difference of 1.2 V across the switch while ON to prevent excessive VCC current draw. Verify that the operating temperature range meets the system requirements, specifically noting the -55°C to +85°C limit for standard operation.

Part Context

The MC74LVXT4066 belongs to the LVXT family of high-performance silicon-gate CMOS analog switches. It shares pinout compatibility with older metal-gate CMOS devices like the MC14066 and HC4066A but offers improved linearity and lower ON resistance. This family is designed for applications requiring fast propagation delays and low power consumption in portable and battery-operated systems.

Replacement Considerations

Direct pin-compatible replacements include other members of the 74LVXT4066 family in different packaging options, such as the MC74LVXT4066DR2G (SOIC-14) or MC74LVXT4066DTRG (TSSOP-14), subject to availability and current manufacturing status.

FAQ

Can the MC74LVXT4066 interface 5.0 V circuits to 3.0 V circuits?

Yes, the device input structure provides protection allowing voltages up to 7.0 V to be applied regardless of the supply voltage, making it suitable for interfacing 5.0 V circuits to 3.0 V circuits.

What is the maximum voltage difference allowed across the switch when it is ON?

For voltage drops across the switch greater than 1.2 V while ON, excessive VCC current may be drawn. Therefore, the static or dynamic voltage across the switch should generally be constrained to 1.2 V or less to ensure reliability.

How does the ON resistance linearity compare to metal-gate CMOS switches?

The ON resistances (Ron) of the MC74LVXT4066 are much more linear over the input voltage range compared to the Ron of metal-gate CMOS analog switches like the MC14066.