MAX3440EASA+T

Overview

The MAX3440EASA+T is a half-duplex RS-485 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +4.75V to +5.25V supply and supports data rates up to 10Mbps. The device features ±60V fault protection on the A and B bus lines, ±15kV ESD protection via the Human Body Model, and true fail-safe receiver inputs that guarantee a logic-high output when inputs are open or shorted. It includes hot-swap circuitry for telecom applications and enhanced slew-rate limiting to minimize EMI. The component is housed in an 8-pin SO package and is specified over an industrial temperature range of -40°C to +85°C.

Feature Summary

• ±60V Fault Protection
• True Fail-Safe Receiver Inputs
• Hot-Swap Capability
• Enhanced Slew-Rate Limiting

Applications

• RS-422/RS-485 Communications
• Industrial Networks
• Telecommunications Systems
• HVAC Controls

Procurement Notes

Verify the specific suffix 'A' indicates the automotive temperature range (-40°C to +125°C) if required, as datasheet tables list 'EA' variants for this range while 'EE' covers industrial (-40°C to +85°C). Confirm RoHS compliance status through official manufacturer documentation. Ensure the ordering code matches the exact package type and thermal rating needed for the target application environment.

Selection Notes

Select the MAX3440E variant specifically for its guaranteed 250kbps maximum data rate with reduced EMI characteristics due to slew-rate limiting. This distinguishes it from the MAX3441E/MAX3443E which support higher speeds but lack the enhanced slew-rate limiting. Verify that the 1/4-unit-load input impedance requirement aligns with the bus topology design to support up to 128 transceivers.

Part Context

The MAX3440E is part of the MAX3440E–MAX3444E family of fault-protected transceivers designed for robust communication in electrically noisy environments. These devices integrate driver and receiver functions into a single IC, providing comprehensive protection against signal faults and electrostatic discharge without requiring external components.

Replacement Considerations

The MAX3441E, MAX3442E, and MAX3443E are direct functional replacements within the same family, sharing identical pinouts and core protections. The MAX3444E serves as a replacement for J1708 specific applications. All variants maintain the ±60V fault protection and fail-safe features.