5kVRMS Isolated 20Mbps Half-Duplex PROFIBUS/RS-485 Transceivers with ±35kV ESD Protection

Industry's Most Robust Isolated RS-485

Please check latest availability status for a specific part variant.


The MAX14941/MAX14942 isolated RS-485/PROFIBUS-DP transceivers provide 5000VRMS (60s) of galvanic isolation between the cable-side (RS-485 driver/receiver-side) and the UART-side of the device. Isolation improves communication by breaking ground loops and reduces noise when there are large differences in ground potential between ports. These devices allow for robust communication up to 20Mbps.

An integrated LDO provides a simple and space-efficient architecture for providing power to the cable side of the IC.

Each device includes one half-duplex driver/receiver channel. The receiver is 1/4-unit load, allowing up to 128 transceivers on a common bus.

Integrated true fail-safe circuitry ensures a logic-high on the receiver output when inputs are shorted or open. Undervoltage lockout disables the driver when cable-side or UART-side power supplies are below functional levels.

The driver outputs/receiver inputs are protected from ±35kV electrostatic discharge (ESD) to GNDB on the cable side, as specified by the Human Body Model (HBM).

The MAX14941/MAX14942 are available in a wide-body 16-pin SOIC package and operate over the -40°C to +105°C temperature range.
MAX14941, MAX14942: Functional Diagram MAX14941, MAX14942: Functional Diagram Enlarge+

Key Features

  • High-Performance Transceiver Enables Flexible Designs
    • Integrated LDO for Cable-Side Power
    • Compliant with RS-485 EIA/TIa-485 Standard
    • 20Mbps Maximum Data Rate
    • Allows Up to 128 Devices on the Bus
  • Integrated Protections Ensures Robust Communication
    • ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs
    • 5kVRMS Withstand Isolation Voltage for 60s (VISO)
    • 1200VPEAK Maximum Repetitive Peak-Isolation Voltage (VIORM)
    • 848VRMS Maximum Working-Isolation Voltage (VIOWM)
    • > 30 Years Lifetime at Rated Working Voltage
    • Withstands ±10kV Surge per IEC 61000-4-5
    • Thermal Shutdown


  • HVAC
  • Industrial Automation Equipment
  • Power Meters
  • Programmable Logic Controllers
Part NumberTx/RxDuplexVSUPPLY
Galvanic Isolation
Data Rate
ESD Protect.
Tx ENRx ENRx/Tx on BusOper. Temp.
typminSee Notes
MAX14941 1Tx + 1RxHalf5500042000035YesYes128-40 to +105
$4.20 @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.

MAX149X1EVKIT: Evaluation Kit for the MAX14938/MAX14939/MAX14941/MAX14942/MAX14945 and MAX14948

Quality and Environmental Data

Request Reliability Report for: MAX14941 
Lead-Free Package Tin (Sn) Whisker Reports
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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