±65V Fault Protected 500Kbps/20Mbps Half-Duplex RS-485/RS-422 Transceivers

Robust RS-485 increases uptime

Please check latest availability status for a specific part variant.


The MAX14775E/MAX14776E fault-protected RS-485/RS-422 transceivers feature ±65V protection for overvoltage signal faults on communication bus lines, ensuring communication in harsh industrial environments. Each device contains one driver and one receiver and operates over the 3V to 5.5V supply range. The MAX14775E is optimized for high-speed data rates up to 20Mbps. The MAX14776E features slew-rate limited outputs for data rates up to 500kbps.

These transceivers are optimized for robust communication in noisy environments. A large 200mV (typ) hysteresis on receiver inputs ensure for high noise rejection and a failsafe feature guarantees a logic-high on the receiver output when the inputs are open or shorted. Driver outputs are protected against short-circuit conditions.

The MAX14775E/MAX14776E receivers feature a 1/3-unit load input impedance, allowing up to 100 transceivers on a bus.

The MAX14775E/MAX14776E are available in 8-pin SOIC and 8-pin TDFN-EP packages and operate over the -40°C to +125°C temperature range.
MAX14775E, MAX14776E: Functional Diagram MAX14775E, MAX14776E: Functional Diagram Enlarge+

Key Features

  • Integrated Protection Ensures for Robust Communication
    • ±65V Fault Protection Range on Driver Outputs/Receiver Inputs
    • ±25V Common Mode Range on the Receiver Inputs
    • Large Receiver Hysteresis Increases Noise Tolerance
    • Hot-Swap Protection
    • Thermal Shutdown
  • High-Performance Transceiver Enables Flexible Designs
    • Compliant with RS-485 EIA/TIA-485 Standard
    • 20Mbps (MAX14775E)/500kbps (MAX14776E) Maximum Data Rate
    • 3V to 5.5V Supply Range
    • Up to 100 Devices on the Bus


  • HVAC
  • Industrial Field Bus Networks
  • Motion Controllers
Part NumberTx/RxDuplexVSUPPLY
Fault Protect.
Data Rate
ESD Protect.
Tx ENRx ENICC (Shutdn.)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
typmintypSee Notes
MAX14775E 1Tx + 1RxHalf3.0 to 5.5653200008YesYes4100Open or ShortedNo-40 to +125
SOIC (N)/8
$3.01 @1k
MAX14776E 500Yes
SOIC (N)/8
$2.91 @1k
See All RS-485/RS-422 Line Driver/Receivers (204)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX14775EEVKIT: Evaluation Kit for the MAX14775E/MAX14776E

Technical Documents

Tutorial 763 Guidelines for Proper Wiring of an RS-485 (TIA/EIA-485-A) Network
Tutorial 723 Selecting and Using RS-232, RS-422, and RS-485 Serial Data Standards

Quality and Environmental Data

Request Reliability Report for: MAX14775E 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Transceivers for Motion Control ›

Topmark Coding MAX14775E

Tools & Models

  • MAX14775E IBIS Model
  • CAD Symbols and Footprints

  • MAX14775EASA+
  • MAX14775EASA+T
  • MAX14775EATA+
  • MAX14775EATA+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >


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