MAX33046EASA+T

Overview

The MAX33046EASA+T is a half-duplex RS-485/RS-422 transceiver operating on a single 3.0V to 5.5V supply. It supports data rates up to 20Mbps with a typical driver propagation delay of 40ns and receiver delay of 75ns. The device features ±40kV HBM ESD protection, ±15kV air-gap and ±10kV contact discharge per IEC 61000-4-2, and ±25V fault protection on A/B lines. It includes thermal shutdown at +160°C, true fail-safe logic-high output for open or shorted inputs, and hot-swap capability. Packaged in an 8-pin SOIC, it operates from -40°C to +125°C.

Feature Summary

• Integrated high-voltage ESD and fault protection for harsh industrial environments
• Hot-swap input circuitry prevents false transitions during board insertion
• True fail-safe receiver guarantees logic-high output when inputs are open or shorted
• Thermal shutdown protects the driver from excessive power dissipation

Applications

• Programmable Controller systems
• Factory Automation Equipment
• Motion Controllers
• Encoder Interfaces
• Backplane Buses

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and RoHS compliance status. Confirm availability directly with Analog Devices or authorized distributors as indicated in the datasheet revision history. Ensure the component matches the required temperature range and data rate specifications for the target application before procurement.

Selection Notes

Select the MAX33046EASA+T for applications requiring high-speed data transmission up to 20Mbps over RS-485 or RS-422 networks. This part is suitable for designs needing robust ESD and fault protection without external components. Consider the 1/8-unit load capability if network scalability beyond standard node limits is required. Verify that the 8-pin SOIC package fits the available PCB footprint constraints.

Part Context

This component belongs to the MAX33045E/MAX33046E family of half-duplex transceivers. While the MAX33045E variant is limited to 500kbps, the MAX33046E provides enhanced performance for higher speed requirements. Both share identical pinouts, protection features, and packaging, differing primarily in their guaranteed maximum data rates.

Replacement Considerations

The MAX33045EASA+T is a pin-compatible alternative within the same family but offers a lower maximum data rate of 500kbps. No other direct substitutes are confirmed in the provided documentation.

FAQ

How does the MAX33046E handle hot-swap conditions?

It features internal pulldown/pullup circuitry on the DE input that holds the driver disabled for at least 10µs upon power-up, preventing unwanted activation during board insertion.

What is the fail-safe behavior of the receiver?

The receiver guarantees a logic-high output (RO) if both A and B inputs are open, shorted, or connected to a terminated line with all drivers disabled.

What ESD protection levels are supported?

The A and B pins support ±40kV Human Body Model (HBM), ±15kV Air-Gap Discharge, and ±10kV Contact Discharge per IEC 61000-4-2.