MAX3440EESA+T

Overview

The MAX3440EESA+T is a single RS-485 transceiver manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-pin SO package. It operates from a +4.75V to +5.25V supply and supports data rates up to 10Mbps. The device features ±60V fault protection on the A and B pins, ±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. Hot-swap circuitry prevents false transitions during bus connection. It includes one differential driver with three-state output and one differential receiver with three-state input, utilizing a 1/4-unit-load impedance to support up to 128 transceivers on a single bus.

Feature Summary

• ±60V fault protection withstands signal faults on communication bus lines without damage
• Hot-swap capability eliminates false transitions during circuit initialization or live backplane connection
• True fail-safe receiver inputs ensure a logic-high output when inputs are open, shorted, or idle
• Enhanced slew-rate-limiting minimizes electromagnetic interference and reduces cable reflections

Applications

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

Procurement Notes

Verify the component authenticity through official manufacturer channels or authorized distributors. Confirm the specific suffix '+T' indicates tape-and-reel packaging if required for automated assembly. Ensure the ordering part number matches the exact temperature range and package style needed for the design. Cross-reference the datasheet revision to confirm pinout and electrical characteristics remain consistent with current production standards.

Selection Notes

Select this component for applications requiring robust fault protection against high-voltage bus shorts. The integrated hot-swap feature makes it suitable for systems frequently connected to live backplanes. Choose this variant over non-slew-rate-limited models when minimizing electromagnetic interference is critical for compliance. Verify that the 10Mbps maximum data rate aligns with the system's communication speed requirements.

Part Context

This device belongs to the MAX3440E–MAX3444E family of fault-protected transceivers. While sharing similar protection features, other members like the MAX3441E offer higher data rates without slew-rate limiting. The MAX3440E specifically balances error-free transmission at lower speeds with reduced EMI. It is designed to replace standard RS-485 transceivers in harsh industrial environments where bus line faults are common.

Replacement Considerations

Public confirmed substitute part numbers include MAX3440EESA+ (tube packaging) and MAX3440EEPA+ (PDIP package). These variants share identical electrical specifications and pinouts but differ in physical packaging format.