MAX378CWG

Analog Switches, Multiplexers, Demultiplexers Overview

The MAX378CWG is an 8-channel single-ended analog multiplexer in a 24-pin Wide SO package. It operates from ±4.5V to ±18V supplies with a typical power dissipation of less than 2mW. The device provides fault protection, limiting input leakage current to nanoamperes when power supplies are off or during overvoltage conditions up to ±60V continuous and ±75V with supplies off. Digital inputs are TTL and CMOS compatible with thresholds of 0.8V and 2.4V. Key electrical parameters include an on-resistance of 2.0kΩ to 3.5kΩ, access time of 0.5µs to 1.0µs, and break-before-make delay of 25ns to 200ns.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Series N-channel/P-channel/N-channel structure ensures all channels turn off when power supplies are removed, protecting connected sensors and signal sources.
• Break-before-make switching action prevents simultaneous connection of multiple input channels to the output.
• Latchup-proof construction guarantees robust operation under various fault conditions.

Analog Switches, Multiplexers, Demultiplexers Applications

• Data Acquisition Systems
• Industrial and Process Control Systems
• Avionics Test Equipment

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific suffix 'WG' corresponds to the 24-pin Wide SOIC package and the C grade for the 0°C to +70°C operating temperature range. Confirm that the component meets RoHS requirements if applicable to the project specifications. Ensure the ordering information matches the exact part number variant required for the design.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component for applications requiring high-voltage fault protection and low power consumption. Verify that the ±4.5V to ±18V supply range aligns with the system power architecture. Consider the 24-pin Wide SO package dimensions for PCB layout constraints and thermal management requirements.

Analog Switches, Multiplexers, Demultiplexers Part Context

The MAX378CWG belongs to the MAX378/MAX379 family of high-voltage, fault-protected analog multiplexers manufactured by Maxim Integrated (now Analog Devices). This series utilizes a unique series FET switching scheme to provide superior protection against overvoltage and power-off conditions compared to earlier generations.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

The MAX378CPE (16-pin Plastic DIP) and MAX378EWE (24-pin Wide SO, -40°C to +85°C) are direct pin-compatible alternatives within the same family. Verify package compatibility and temperature range requirements before substitution.

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the MAX378 handle overvoltage conditions?

The device uses a series FET structure that limits fault currents to sub-microamp levels and turns off all channels if power supplies are removed, protecting both the mux and connected sensors.

What is the digital input compatibility of the MAX378?

All digital inputs have logic thresholds of 0.8V and 2.4V, ensuring compatibility with both TTL and CMOS logic levels without requiring pull-up resistors.

Does the MAX378 support break-before-make switching?

Yes, the device guarantees break-before-make operation with a delay of 25ns to 200ns, preventing input-to-input shorts during channel switching.