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+3V to +5.5V, Polarity Invert RS-485 Half-Duplex Transceiver with ±65V Fault Protection, ±40V CMR, and ±40kV ESD

Industry's Highest Common-Mode Range RS-485 at ±40V, with Highest ESD at ±40kV and ±65V of Fault Protection

Product Details

The MAX33072E/MAX33073E are a family of fault-protected RS-485/RS-422 transceivers with high ±65V protection for overvoltage conditions on the communication bus lines, ensuring robust protection in harsh industrial environments. Both devices have ±40V of common-mode range (CMR) within VCCH (+4.5V to +5.5V), exceeding the RS-485 standard of -7V to +12V, suitable for electrically noisy environments where different systems have shifting ground levels relative to each other. They also incorporate a high ESD protection circuit capable of protecting against ±40kV of ESD HBM (human body model) for driver outputs and receiver inputs (A and B data lines). Each device contains one driver and one receiver and operates over the +3V to +5.5V supply range, making it convenient for designers to use one part with either +3.3V or +5V supply voltages across multiple end equipment.

These devices feature a polarity selection input (POL) that swaps the A and B data lines, allowing for software correction of cross-wired field cables.

The MAX33072E features slew-rate-limited outputs for data rates up to 500kbps, while the MAX33073E is rated up to 2Mbps for applications requiring higher bandwidth. These transceivers are optimized for robust communication in noisy environments. A true failsafe feature guarantees a logic-high on the receiver output when the inputs are open or shorted. Driver outputs are protected against short-circuit conditions. The receivers feature a 1/8 unit load input impedance, allowing up to 256 transceivers on a bus. The MAX33072E/MAX33073E are available in 8-pin SOIC and operate over the -40°C to +125°C temperature range.

Key Features

  • Integrated Protection for Robust Communication
    • Protection on Driver Outputs/Receiver Inputs (A, B Data Lines)
      • ±65V Fault Protection Range on Driver Outputs/Receiver Inputs
      • ±40V Common-Mode Range on Driver Outputs/Receiver Inputs
      • ±40kV Human Body Model (JEDEC JS-001-2017) ESD Protection
      • ±15kV Air Gap Discharge (IEC 61000-4-2) ESD Protection
      • ±10kV Contact Discharge (IEC 61000-4-2) ESD Protection
    • Hot-Swap Protection
    • Short Circuit Protection
    • Thermal Shutdown
    • True Fail-Safe Guarantees Known Receiver Output State
    • Wide Operating Temperature Range from -40°C to +125°C
  • High-Performance Transceiver Enables Flexible Designs
    • Compliant with RS-485 EIA/TIA-485 Standard
    • 500kbps (MAX33072E), 2Mbps (MAX33073E) Maximum Data Rate
    • 3V to 5.5V Supply Range
    • 1/8 Unit Load for up to 256 Devices on the Bus

Applications/Uses

  • Agriculture and Heavy Machinery
  • Elevator Control
  • Home and Building Automation
  • HVAC
  • Industrial Automation Equipment
  • Motion Controllers
  • Power Supply and UPS
Parametric specs for RS-485/RS-422 Transceivers (RS485, RS422 TxRx)
# Tx/Rx 1Tx + 1Rx
Duplex Half
VSUPPLY (V) 3.0 to 5.5
Data Rate (kbps) (min) 500
Fault Protect. (±V) 65
ICC (mA) (typ) 3
ESD Protect. (±kV) 40
Tx EN Yes
Rx EN Yes
Oper. Temp. (°C) -40 to +125
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
$2.04 @1k
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Simplified Block Diagram

MAX33072E, MAX33073E: Simplified Block Diagram MAX33072E, MAX33073E: Simplified Block Diagram Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX33072E Shield evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the functionality of the MAX33072E half- duplex RS-485 transceiver, with ±65V fault protection, extended ±40V common-mode range, and ±40kV ESD Human Body Model (HBM) for A,B data lines. The EV kit features a digital isolator, which is used as a level translator between the RS-485 transceiver and the controller interface.

View Details

Features

  • Easy Evaluation of the MAX33072E
  • I/O Interface Compatibility from 1.71V to 5.5V
  • Proven PCB Layout
  • Mbed/Arduino Platform Compatible
  • Fully Assembled and Tested

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Support & Training

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Parameters

Parametric specs for RS-485/RS-422 Transceivers (RS485, RS422 TxRx)
# Tx/Rx 1Tx + 1Rx
Duplex Half
VSUPPLY (V) 3.0 to 5.5
Data Rate (kbps) (min) 500
Fault Protect. (±V) 65
ICC (mA) (typ) 3
ESD Protect. (±kV) 40
Tx EN Yes
Rx EN Yes
Oper. Temp. (°C) -40 to +125
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
$2.04 @1k

Key Features

  • Integrated Protection for Robust Communication
    • Protection on Driver Outputs/Receiver Inputs (A, B Data Lines)
      • ±65V Fault Protection Range on Driver Outputs/Receiver Inputs
      • ±40V Common-Mode Range on Driver Outputs/Receiver Inputs
      • ±40kV Human Body Model (JEDEC JS-001-2017) ESD Protection
      • ±15kV Air Gap Discharge (IEC 61000-4-2) ESD Protection
      • ±10kV Contact Discharge (IEC 61000-4-2) ESD Protection
    • Hot-Swap Protection
    • Short Circuit Protection
    • Thermal Shutdown
    • True Fail-Safe Guarantees Known Receiver Output State
    • Wide Operating Temperature Range from -40°C to +125°C
  • High-Performance Transceiver Enables Flexible Designs
    • Compliant with RS-485 EIA/TIA-485 Standard
    • 500kbps (MAX33072E), 2Mbps (MAX33073E) Maximum Data Rate
    • 3V to 5.5V Supply Range
    • 1/8 Unit Load for up to 256 Devices on the Bus

Applications/Uses

  • Agriculture and Heavy Machinery
  • Elevator Control
  • Home and Building Automation
  • HVAC
  • Industrial Automation Equipment
  • Motion Controllers
  • Power Supply and UPS

Description

The MAX33072E/MAX33073E are a family of fault-protected RS-485/RS-422 transceivers with high ±65V protection for overvoltage conditions on the communication bus lines, ensuring robust protection in harsh industrial environments. Both devices have ±40V of common-mode range (CMR) within VCCH (+4.5V to +5.5V), exceeding the RS-485 standard of -7V to +12V, suitable for electrically noisy environments where different systems have shifting ground levels relative to each other. They also incorporate a high ESD protection circuit capable of protecting against ±40kV of ESD HBM (human body model) for driver outputs and receiver inputs (A and B data lines). Each device contains one driver and one receiver and operates over the +3V to +5.5V supply range, making it convenient for designers to use one part with either +3.3V or +5V supply voltages across multiple end equipment.

These devices feature a polarity selection input (POL) that swaps the A and B data lines, allowing for software correction of cross-wired field cables.

The MAX33072E features slew-rate-limited outputs for data rates up to 500kbps, while the MAX33073E is rated up to 2Mbps for applications requiring higher bandwidth. These transceivers are optimized for robust communication in noisy environments. A true failsafe feature guarantees a logic-high on the receiver output when the inputs are open or shorted. Driver outputs are protected against short-circuit conditions. The receivers feature a 1/8 unit load input impedance, allowing up to 256 transceivers on a bus. The MAX33072E/MAX33073E are available in 8-pin SOIC and operate over the -40°C to +125°C temperature range.

Simplified Block Diagram

MAX33072E, MAX33073E: Simplified Block Diagram MAX33072E, MAX33073E: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.