MAX378CWG+

Analog Switches, Multiplexers, Demultiplexers Overview

The MAX378CWG+ is a high-voltage, fault-protected analog multiplexer manufactured by Analog Devices Inc./Maxim Integrated. It features an 8-channel single-ended (1-of-8) configuration housed in a 24-pin Wide SO package. The device operates from dual power supplies ranging from ±4.5V to ±18V, with a typical operating voltage of ±15V. It provides significant fault protection, allowing continuous input voltages up to ±60V even when power supplies are off, and withstands up to ±75V under those conditions. 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. The component supports digital inputs compatible with both TTL and CMOS logic levels.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Series N-channel/P-channel/N-channel structure ensures all switches turn off when power supplies are removed, limiting leakage current to nanoamperes.
• Withstands continuous ±60V input overvoltage while powered and ±75V when unpowered without damage or increased supply current.
• Guaranteed break-before-make operation prevents simultaneous connection of multiple channels, eliminating input-to-input shorts.
• Digital inputs feature fixed logic thresholds ensuring direct compatibility with standard TTL and CMOS signals.

Analog Switches, Multiplexers, Demultiplexers Applications

• Data Acquisition Systems
• Industrial and Process Control Systems
• Avionics Test Equipment
• Signal Routing Between Systems

Analog Switches, Multiplexers, Demultiplexers Procurement Notes

Verify the specific suffix 'WG' corresponds to the 24-pin Wide SOIC package and commercial temperature range (0°C to +70°C). Confirm that the '+' designation indicates lead-free compliance as per manufacturer standards. Ensure the source document explicitly lists this part number to avoid confusion with similar variants like the MAX379 or different package options.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select the MAX378CWG+ for applications requiring robust fault protection against high-voltage transients on sensor lines. It is suitable for systems where signal sources may remain energized while the multiplexer is powered down. Consider the ±15V supply requirement and the specific 8-channel single-ended topology. Verify that the on-resistance and switching speeds meet the system's settling time requirements.

Analog Switches, Multiplexers, Demultiplexers Part Context

The MAX378 is part of the Maxim Integrated high-voltage fault-protected multiplexer family, designed alongside the differential MAX379. It utilizes a series FET architecture to provide superior isolation compared to first-generation devices. The CWG variant specifically denotes the plastic wide small-outline package intended for surface-mount assembly in industrial environments.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

Public confirmed substitute part numbers: MAX378EWG (Extended Temperature Range), MAX378CPE (Plastic DIP Package).