MAX14939

2.75kVRMS 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.

Description

The MAX14938/MAX14939 isolated RS-485/PROFIBUS-DP transceivers provide 2750VRMS (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 MAX14938/MAX14939 are available in a wide-body 16-pin SOIC package and operate over the -40°C to +105°C temperature range.
MAX14938, MAX14939: Functional Diagram MAX14938, MAX14939: 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
    • 2.75kVRMS Withstand Isolation Voltage for 60s (VISO)
    • 630VPEAK Maximum Repetitive Peak-Isolation Voltage (VIORM)
    • 445VRMS Maximum Working-Isolation Voltage (VIOWM)
    • > 30 Years Lifetime at Rated Working Voltage
    • Withstands ±10kV Surge per IEC 61000-4-5
    • Thermal Shutdown

Applications/Uses

  • HVAC
  • Industrial Automation Equipment
  • Power Meters
  • Programmable Logic Controllers
Part NumberTx/RxDuplexVSUPPLY
(V)
Galvanic Isolation
(±V)
ICC
(mA)
Data Rate
(kbps)
ESD Protect.
(±kV)
Tx ENRx ENRx/Tx on BusOper. Temp.
(°C)
Package/PinsBudgetary
Price
typminSee Notes
MAX14938 1Tx + 1RxHalf5275042000035YesYes128-40 to +105
SOIC HYBRID (W)/16
$3.65 @1k
MAX14939 
SOIC HYBRID (W)/16
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: MAX14939 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX14939GWE+
  • MAX14939GWE+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 >

     
    Status:
    Package:
    Temperature:

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    Belle Isle 2020
    05/29/2020 - 05/31/2020, Detroit, MI
    2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.

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