+3.3V-Powered, ±20kV ESD-Protected, 20Mbps and Slew-Rate-Limited RS-485/RS-422 Transceivers

High ESD protection increases robustness and reliability of industrial end equipment

Please check latest availability status for a specific part variant.


Devices in the MAX3483AE family (MAX3483AE/MAX3485AE/MAX3488AE/MAX3490AE/MAX3491AE) are ±20kV ESD-protected RS-485/422 transceivers, optimized for extended cable runs in noisy environments. All devices operate from a single 3.3V supply.

The MAX3483AE and MAX3485AE are half-duplex transceivers. The MAX3488AE, MAX3490AE, and MAX3491AE are full-duplex transceivers. The MAX3483AE/85AE have a 1-unit load receiver input impedance, allowing up to 32 transceivers on the bus. The MAX3488AE/90AE/91AE have a 1/4-unit load receiver input impedance, allowing up to 128 transceivers on the bus. Each transceiver includes a fail-safe receiver, ensuring that the receiver output (RO) is high when inputs are shorted, open, or connected to a three-state bus.

The MAX3483AE, MAX3485AE, MAX3488AE, and MAX3490AE are available in industry standard 8-pin SO package, while the MAX3491AE is available in a 14-pin SO package.

MAX3483AE, MAX3485AE, MAX3488AE, MAX3490AE, MAX3491AE: Functional Diagram MAX3483AE, MAX3485AE, MAX3488AE, MAX3490AE, MAX3491AE: Functional Diagram Enlarge+

Key Features

  • Integrated Protection Increases Robustness
    • High ESD Protection
      • ±20kV HBM ESD per JEDEC JS-001-2012
      • ±15kV Air Gap per IEC 61000-4-2
      • ±8kV Contact ESD per IEC 61000-4-2
    • Short-Circuit Protected Outputs
    • True Fail-Safe Receiver Prevents False Transition on Receiver Input Short or Open Events
    • Hot-Swap Capability Eliminates False Transitions During Power-Up or Hot Insertion
  • High-Speed Data Rates up to 20Mbps
  • Up to -40°C to +125°C Operating Temperature
  • Allows Up to 128 Transceivers on the Bus


  • Industrial-Control Local Area Networks
  • Telecommuncations
  • Transceivers for EMI-Sensitive Applications
Part NumberTx/RxDuplexVSUPPLY
Data Rate
ESD Protect.
Tx ENRx ENRx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
typminSee Notes
MAX3483AE 1Tx + 1RxHalf3.31.925020YesYes32Open or ShortedNo-40 to +125
SOIC (N)/8
$1.98 @1k
MAX3485AE Half20000YesYes32-40 to +125
SOIC (N)/8
$2.03 @1k
MAX3488AE Full250NoNo128-40 to +125
SOIC (N)/8
$2.08 @1k
MAX3490AE Full20000NoNo128-40 to +105
SOIC (N)/8
$2.13 @1k
MAX3491AE Full20000YesYes128-40 to +125
SOIC (N)/14
$2.18 @1k
See All RS-485/RS-422 Line Driver/Receivers (205)
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.

Technical Documents

Tutorial 6387 RS-485: Still the Most Robust Communication

Quality and Environmental Data

Request Reliability Report for: MAX3491AE 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX3491AEASD+
  • MAX3491AEASD+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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