MAX33074EASA+

Overview

The MAX33074EASA+ is a half-duplex RS-485/RS-422 transceiver from Analog Devices. It supports data rates up to 20 Mbps and operates on a supply voltage range of 3.0V to 5.5V. The device features ±65V fault protection, ±40V common-mode range, and ±40kV ESD protection on A/B pins. It includes a low-power shutdown mode with 4μA current draw, true fail-safe logic-high output when inputs are open, and thermal shutdown at +160°C. Packaged in an 8-pin SOIC with exposed pad (SO-EP), it operates from -40°C to +125°C.

Feature Summary

• Integrated ±65V overvoltage fault protection on driver outputs and receiver inputs for robust industrial communication.
• High-performance 20 Mbps data rate capability optimized for noisy environments with ±40V common-mode range.
• Low-power shutdown mode reduces supply current to 4μA, featuring glitch protection against accidental activation.

Applications

• Industrial Automation Equipment
• Home and Building Automation
• Power Supply and UPS Systems

Procurement Notes

Verify the specific suffix 'EASA+' corresponds to the 8-pin SOIC with Exposed Pad package and RoHS compliance status. Confirm the manufacturer's production status directly through authorized channels as availability may vary. Ensure the ordering information matches the exact datasheet revision required for your design specifications.

Selection Notes

Select this component for applications requiring high-speed 20 Mbps communication alongside extreme bus fault tolerance. It is suitable for systems with significant ground potential differences due to its ±40V common-mode range. Consider the exposed pad package for improved thermal dissipation in high-duty-cycle transmission scenarios.

Part Context

This part belongs to the MAX33070E/MAX33071E/MAX33074E family of fault-protected transceivers. While the MAX33070E is limited to 500kbps and the MAX33071E to 2Mbps, the MAX33074E provides the highest bandwidth within this specific ruggedized series, sharing identical protection and interface characteristics.

Replacement Considerations

Direct functional substitutes within the same family include the MAX33070E and MAX33071E, though they offer lower maximum data rates of 500kbps and 2Mbps respectively. Verify pinout compatibility and thermal requirements when substituting between these variants.

FAQ

How does the device handle hot-swap conditions?

The MAX33074EASA+ features hot-swap input circuitry on the DE pin. An internal pulldown holds DE low for at least 10μs during power-up to prevent unwanted driver activation when inserting boards into powered backplanes.

What is the behavior of the receiver when inputs are open?

The device incorporates a true fail-safe feature that guarantees a logic-high state on the receiver output (RO) when the A and B inputs are open or shorted.

What happens if the junction temperature exceeds safe limits?

Thermal shutdown protection disables the driver outputs and places RO in a high-impedance state when the junction temperature exceeds +160°C. Outputs re-enable when the temperature falls below +148°C.