MAX378EWG

Analog Switches, Multiplexers, Demultiplexers Overview

The MAX378EWG 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 supply voltages ranging from ±4.5V to ±18V and supports an extended industrial temperature range of -40°C to +85°C. Key electrical specifications include an on-resistance of 2.0kΩ to 3.5kΩ, input leakage current of -1.0µA to 1.0µA under overvoltage conditions, and off-isolation of 50dB to 68dB at 100kHz. The component provides significant fault protection, withstanding continuous ±60V inputs with power supplies active and ±75V with power supplies off.

Analog Switches, Multiplexers, Demultiplexers Feature Summary

• Series N-channel/P-channel/N-channel structure ensures all channels turn off when power supplies are removed, limiting leakage to nanoamperes.
• Withstands continuous ±60V input voltage with power supplies present and ±75V with power supplies off without damage.
• Break-before-make switching action prevents simultaneous connection of multiple input channels to the output.
• Digital inputs feature logic thresholds compatible with both TTL and CMOS standards without requiring external pull-up resistors.

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 EWG corresponds to the -40°C to +85°C operating temperature range and the 24-pin Wide SOIC package. Confirm RoHS compliance status for the specific manufacturing lot. Ensure the design accommodates the required supply voltage range of ±4.5V to ±18V. Check for any recent product change notices or obsolescence announcements from the manufacturer.

Analog Switches, Multiplexers, Demultiplexers Selection Notes

Select this component when high-voltage fault protection is critical for sensor safety. The 8-channel single-ended architecture suits applications requiring signal routing from multiple sources. Consider the ±60V continuous input rating for harsh industrial environments. Verify that the 2.0kΩ to 3.5kΩ on-resistance meets the system's accuracy requirements.

Analog Switches, Multiplexers, Demultiplexers Part Context

The MAX378EWG belongs to the MAX378/MAX379 family of high-voltage, fault-protected analog multiplexers. The MAX378 variant specifically offers 8 single-ended channels, whereas the MAX379 provides 4 differential channels. Both share identical fault-protection circuitry and digital interface characteristics, differing primarily in channel count and configuration.

Analog Switches, Multiplexers, Demultiplexers Replacement Considerations

MAX378CWG: Same function but limited to commercial temperature range (0°C to +70°C).

Analog Switches, Multiplexers, Demultiplexers FAQ

How does the MAX378 handle overvoltage when power is off?

When power supplies are off, the series FET structure turns all channels off, allowing only nanoamperes of leakage current to flow even with inputs up to ±75V.

What is the break-before-make delay time?

The break-before-make delay is typically between 25ns and 200ns, preventing input-to-input shorts during channel switching.

Can the device operate with a single supply?

Yes, it can operate with a single +9V to +22V supply by connecting V- to GND, while maintaining TTL/CMOS compatibility.