MAX3491EESD+

Overview

The MAX3491EESD+ is a full-duplex RS-485/RS-422 transceiver operating from a single +3.3V supply without a charge pump. It supports data rates up to 12Mbps with slew-rate-limited drivers to minimize EMI and reflections. The device features ±15kV ESD protection on all I/O pins, compliant with Human Body Model and IEC 1000-4-2 standards. It includes driver short-circuit current limiting and thermal shutdown for overload protection. The receiver incorporates a fail-safe feature ensuring a logic-high output when inputs are open. Operating temperature range is -40°C to +85°C in an SOIC-14 package.

Feature Summary

• Full-duplex communication capability with independent transmit and receive channels
• Integrated ±15kV electrostatic discharge protection on transmitter outputs and receiver inputs
• Slew-rate-limited drivers designed to reduce electromagnetic interference and signal reflections
• Low-power shutdown mode achieving typical 2nA supply current consumption

Applications

• Telecommunications systems
• Industrial-control local area networks
• EMI-sensitive applications requiring reduced noise emissions
• Integrated services digital networks (ISDN)
• Packet switching environments

Procurement Notes

Verify the specific suffix 'ESD+' against the manufacturer's official ordering guide to confirm RoHS compliance and lead-free status. Confirm that the SOIC-14 package variant matches the required PCB footprint dimensions. Ensure the extended industrial temperature rating (-40°C to +85°C) aligns with the operational environment requirements of the target system design.

Selection Notes

Select this component for designs requiring full-duplex RS-485 or RS-422 connectivity at speeds up to 12Mbps. It is suitable for applications needing robust ESD protection without external components. Compare against half-duplex variants like the MAX3485E if bidirectional single-wire communication suffices. Verify power supply constraints, as the device requires a stable +3.3V source and lacks internal voltage regulation.

Part Context

The MAX3491E belongs to the MAX3483E family of low-power transceivers manufactured by Analog Devices / Maxim Integrated. This family shares common electrical characteristics such as 3.3V operation and ESD protection levels. Distinctive features of the MAX3491E include its full-duplex architecture and 14-pin configuration, differentiating it from the half-duplex 8-pin counterparts within the same product line.

Replacement Considerations

Publicly confirmed substitute part numbers include MAX3491EESA+ and MAX3491EESD+T. These variants maintain identical functional specifications but differ in packaging format or reel configuration.