Complete, Isolated, 3.3V RS-485/RS-422 Data Interface

Please check latest availability status for a specific part variant.


The MAX3480A/MAX3480B are electrically isolated RS-485/RS-422 data-communications interfaces. Transceivers, optocouplers, and a transformer are all included in one low-cost, 28-pin DIP package. A single +3.3V supply on the logic side powers both sides of the interface.

The MAX3480B features reduced-slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The MAX3480A's driver slew rate is not limited, allowing transmission rates up to 2.5Mbps.

These devices typically draw 180mA of quiescent supply current. The MAX3480B provides a low-power shutdown mode in which it consumes only 0.2µA.

Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if the input is open circuit.

The MAX3480A/MAX3480B typically withstand 1600VRMS (1 minute) or 2000VRMS (1 second). Their isolated inputs and outputs meet RS-485/RS-422 specifications.

MAX3480A, MAX3480B: Pin Configuration MAX3480A, MAX3480B: Pin Configuration Enlarge+

Key Features

  • Isolated Data Interface to 1600VRMS (1 minute)
  • Slew-Rate-Limited Data Transmission (MAX3480B)
  • High-Speed, Isolated, 2.5Mbps RS-485 Interface (MAX3480A)
  • -7V to +12V Common-Mode Input Voltage Range with Respect to Isolated Ground
  • Single +3.3V Supply
  • Current Limiting and Thermal Shutdown for Driver Overload Protection
  • Standard 28-Pin DIP Package


  • Automated Test Equipment (ATE)
  • HVAC/Building Control Networks
  • Industrial Control Local Area Networks
  • Isolated RS-485/RS-422 Data Interface
  • Transceivers for EMI-Sensitive Applications
Part NumberTx/RxDuplexVSUPPLY
Galvanic Isolation
Data Rate
Tx ENRx ENICC (Shutdn.)
Rx/Tx on BusRx Failsafe w/ InputsSlew Rate LimitingOper. Temp.
typmintypSee Notes
MAX3480A 1Tx + 1RxHalf3.310001802500YesNo0.232OpenNo
-40 to +85
0 to +70
$19.43 @1k
MAX3480B 120250128
$19.64 @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.

Quality and Environmental Data

Request Reliability Report for: MAX3480B 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX3480BCPI+
  • MAX3480BEPI+
  • 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.

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