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MAX13442E, MAX13443E, MAX13444E

±80V Fault Protected RS-485 Half-Duplex Transceiver with Foldback Current Limit

Simplifies Design and Reduces Board Space by Eliminating External Components Required for Overvoltage Protection Up to ±80V, Such as TVSs and PTCs
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Active: In Production.


The MAX13442E/MAX13444E are fault-protected RS-485 and J1708 transceivers that feature ±80V protection from signal faults on communication bus lines. The MAX13442E/MAX13444E feature a reduced slew-rate driver that minimizes EMI and reflections, allowing error-free transmission up to 250kbps. The MAX13443E driver can transmit up to 10Mbps. The high-speed MAX13443E RS-485 tranceiver features ±60V protection from signal faults on communication bus lines. These transceivers feature foldback current limit. Each device contains one differential line driver with three-state output and one differential line receiver with three-state input. The 1/4-unit-load receiver input impedance allows up to 128 transceivers on a single bus. The devices operate from a 5V supply. True fail-safe inputs guarantee a logic-high receiver output when the receiver inputs are open, shorted, or connected to an idle data line.

Hot-swap circuitry eliminates false transitions on the data bus during circuit initialization or connection to a live backplane. Short-circuit current-limiting and thermal-shutdown circuitry protect the driver against excessive power dissipation, and on-chip ±15kV ESD protection eliminates costly external protection devices.

The MAX13442E/MAX13443E/MAX13444E are available in an 8-pin SO package and are specified over the automotive temperature range.

Data Sheet

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Key Features

  • ±15kV ESD Protection
  • ±80V Fault Protection (±60V MAX13443E)
  • Guaranteed 10Mbps Data Rate (MAX13443E)
  • Hot-Swappable for Telecom Applications
  • True Fail-Safe Receiver Inputs
  • Enhanced Slew-Rate-Limiting Facilitates Error-Free Data Transmission (MAX13442E/MAX13444E)
  • Allow Up to 128 Transceivers on the Bus
  • -7V to +12V Common-Mode Input Range
  • ±6mA FoldBack Current Limit
  • Industry-Standard Pinout


  • Automotive Applications
  • HVAC Controls
  • Industrial Networks
  • RS-422/RS-485 Communications
  • Telecommunications Systems
  • Truck and Trailer Applications

Key Specifications:

RS-422/485 Line Driver/Receivers
Part Number Tx/Rx Duplex VSUPPLY
Fault Protect.
Data Rate
ESD Protect.
Tx EN Rx EN ICC (Shutdn.)
Rx/Tx on Bus Budgetary
typ min typ See Notes
MAX13442E  1Tx + 1Rx Half 5 80 16 250 15 Yes Yes 0.001 128 $3.03 @1k
MAX13443E  60 5 10000
MAX13444E  80 10 250
See All RS-422/485 Line Driver/Receivers (171)

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.


MAX13442E, MAX13443E, MAX13444E: Pin Configurations and Typical Operating Circuits
Pin Configurations and Typical Operating Circuits

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Information Index

Document Ref.: 19-3898 Rev 3; 2011-03-16
This page last modified: 2011-03-16