MAX378EWG+

Analog Switches, Multiplexers, Demultiplexers Overview

The MAX378EWG+ is a high-voltage, fault-protected analog multiplexer manufactured by Analog Devices Inc. (formerly Maxim Integrated). It features an 8-channel single-ended architecture housed in a 24-pin Wide SO package. The device operates from supply voltages ranging from ±4.5V to ±18V and supports an extended temperature range of -40°C to +85°C. It utilizes a series N-channel/P-channel/N-channel structure to provide significant fault protection, allowing continuous input voltages up to ±60V with power supplies active and ±75V when supplies are off. Digital inputs are compatible with both TTL and CMOS logic levels without requiring pull-up resistors.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Series FET switching scheme provides superior fault protection against overvoltage conditions on inputs or outputs.
• All channels automatically turn off when power supplies are removed, limiting leakage currents to the nanoampere level.
• Break-before-make operation is guaranteed to prevent simultaneous connection of multiple input channels.
• Digital interface ensures compatibility with standard TTL and CMOS logic thresholds across the operating temperature range.

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 that the ordering suffix matches the required specifications. Confirm the package type corresponds to the design requirements. Ensure the temperature grade aligns with the operational environment. Check for RoHS compliance status if mandated by project standards. Validate the manufacturer identification to ensure authenticity.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component for applications requiring robust fault protection against high-voltage transients. Consider the ±60V continuous input rating for harsh industrial environments. Evaluate the need for break-before-make timing to prevent signal shorting. Assess the supply voltage range to ensure compatibility with existing system rails. Verify the package dimensions fit the available PCB real estate.

Analog Switches, Multiplexers, Demultiplexers Part Context

The MAX378 is part of a family of high-voltage analog multiplexers designed for demanding signal routing tasks. It shares architectural similarities with the MAX379, which offers differential channel configurations. The EWG suffix specifically denotes the extended temperature variant packaged in a wide small-outline format. This positioning targets reliability-critical systems where sensor protection is paramount.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

MAX378CWG+

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the MAX378 protect against overvoltage when power is off?

When power supplies are off, the internal series FET structure turns all channels off. This limits input current to sub-microamp leakage values, protecting connected sensors from damage even with input voltages up to ±75V.

What is the maximum continuous input voltage with power applied?

The MAX378 can withstand continuous input voltages of ±60V when the V+ and V- power supplies are present and within the specified operating range.

Does the device require external pull-up resistors for digital inputs?

No, the digital inputs have defined logic thresholds of 0.8V and 2.4V, ensuring direct compatibility with TTL and CMOS logic without the need for external pull-up resistors.