MAX33045EASA+

Overview

The MAX33045EASA+ 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 500kbps and accommodates up to 256 nodes via a 1/8-unit load. The device features ±40kV HBM ESD protection, ±25V fault protection, and thermal shutdown at +160°C. Packaged in an 8-pin SOIC, it operates from -40°C to +125°C with a typical quiescent current of 6mA.

Feature Summary

• Integrated high-voltage fault protection and electrostatic discharge shielding for harsh industrial environments
• Hot-swap capability prevents false transitions during board insertion or power-up sequences
• True fail-safe receiver guarantees a logic-high output when inputs are open or shorted

Applications

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

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and RoHS compliance status. Confirm availability directly with Analog Devices or authorized distributors as future product status may apply. Ensure the ordering code matches the required data rate variant.

Selection Notes

Select this component for applications requiring robust ESD and fault tolerance on multipoint buses. The 1/8-unit load allows for expanded network topologies supporting up to 256 nodes. Verify that the 500kbps maximum data rate aligns with system timing requirements.

Part Context

This part belongs to the MAX33045/MAX33046 family of half-duplex transceivers designed for RS-485 and RS-422 standards. The MAX33045 variant specifically targets lower-speed applications compared to the MAX33046, while sharing identical packaging and protection features.

Replacement Considerations

Check pin compatibility with legacy 'SN75174 or 'DS26LS31C devices if upgrading existing designs. Verify voltage levels and interface protocols match before substitution.

FAQ

How does the device handle hot-swap conditions?

Internal pulldown circuitry holds the DE input low for at least 10µs upon power-up to prevent unwanted driver activation during board insertion.

What is the fail-safe behavior of the receiver?

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

What triggers the thermal shutdown protection?

Driver outputs are disabled and RO becomes high impedance when the internal silicon junction temperature exceeds approximately +160°C.