LT1791
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LT1791

60V Fault Protected RS485/RS422 Transceivers

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 18
1ku List Price Starting From $2.78
Features
  • Protected from Overvoltage Line Faults to ±60V
  • Pin Compatible with LTC485 and LTC491
  • High Input Impedance Supports Up to 128 Nodes
  • No Damage or Latchup to ESD
    • IEC-1000-4-2 Level 4: ±15kV Air Discharge
    • IEC-1000-4-2 Level 2: ±4kV Contact Discharge
  • Controlled Slew Rates for EMI Emissions Control
  • Guaranteed High Receiver Output State for Floating, Shorted or Inactive Inputs (LT1785A/LT1791A)
  • Outputs Assume a High Impedance When Off or Powered Down
  • Drives Low Cost, Low Impedance Cables
  • Short-Circuit Protection on All Outputs
  • Thermal Shutdown Protection
  • Guaranteed Operation to 125°C
  • AEC-Q100 Qualified for Automotive Applications (LT1785#W)
Additional Details
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The LT1785/LT1791 are half-duplex and full-duplex differential bus transceivers for RS485 and RS422 applications which feature on-chip protection from overvoltage faults on the data transmission lines. Receiver input and driver output pins can withstand voltage faults up to ±60V with respect to ground with no damage to the device. Faults may occur while the transceiver is active, shut down or powered off.

Data rates to 250kbaud on networks of up to 128 nodes are supported. Controlled slew rates on the driver outputs control EMI emissions and improve data transmission integrity on improperly terminated lines. Drivers are specified to operate with inexpensive cables as low as 72Ω characteristic impedance.

The LT1785A/LT1791A devices have “fail-safe” receiver inputs to guarantee a receiver output high for shorted, open or inactive data lines. On-chip ESD protection eliminates need for external protection devices.

The LT1785/LT1785A are available in 8-lead DIP and SO packages and the LT1791/LT1791A in 14-lead DIP and SO packages.

Applications

  • Industrial Control Data Networks
  • CAN Bus Applications
  • HVAC Controls
Part Models 18
1ku List Price Starting From $2.78

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Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1791ACN#PBF

PRODUCTION

LT1791AHN#PBF

PRODUCTION

LT1791AIN#PBF

PRODUCTION

LT1791CN#PBF

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LT1791HN#PBF

PRODUCTION

LT1791IN#PBF

PRODUCTION

Aug 6, 2022

- 22_0172

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LT1791ACN#PBF

PRODUCTION

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PRODUCTION

LT1791AIN#PBF

PRODUCTION

LT1791CN#PBF

PRODUCTION

LT1791HN#PBF

PRODUCTION

LT1791IN#PBF

PRODUCTION

Oct 12, 2022

- 22_0251

Epoxy Change from Henkel 8290 to 8290A for 14-Lead SOIC Package

LT1791ACS#PBF

PRODUCTION

LT1791ACS#TRPBF

PRODUCTION

LT1791AHS#PBF

PRODUCTION

LT1791AHS#TRPBF

PRODUCTION

LT1791AIS#PBF

PRODUCTION

LT1791AIS#TRPBF

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LT1791CS#PBF

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LT1791HS#PBF

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LT1791HS#TRPBF

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LT1791IS#PBF

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PRODUCTION

Aug 6, 2022

- 22_0173

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LT1791ACS#PBF

PRODUCTION

LT1791ACS#TRPBF

PRODUCTION

LT1791AHS#PBF

PRODUCTION

LT1791AHS#TRPBF

PRODUCTION

LT1791AIS#PBF

PRODUCTION

LT1791AIS#TRPBF

PRODUCTION

LT1791CS#PBF

PRODUCTION

LT1791CS#TRPBF

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Filter by Model

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Part Models

Product Lifecycle

PCN

Oct 11, 2022

- 22_0241

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Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1791ACN#PBF

PRODUCTION

LT1791AHN#PBF

PRODUCTION

LT1791AIN#PBF

PRODUCTION

LT1791CN#PBF

PRODUCTION

LT1791HN#PBF

PRODUCTION

LT1791IN#PBF

PRODUCTION

Aug 6, 2022

- 22_0172

arrow down

Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LT1791ACN#PBF

PRODUCTION

LT1791AHN#PBF

PRODUCTION

LT1791AIN#PBF

PRODUCTION

LT1791CN#PBF

PRODUCTION

LT1791HN#PBF

PRODUCTION

LT1791IN#PBF

PRODUCTION

Oct 12, 2022

- 22_0251

arrow down

Epoxy Change from Henkel 8290 to 8290A for 14-Lead SOIC Package

LT1791ACS#PBF

PRODUCTION

LT1791ACS#TRPBF

PRODUCTION

LT1791AHS#PBF

PRODUCTION

LT1791AHS#TRPBF

PRODUCTION

LT1791AIS#PBF

PRODUCTION

LT1791AIS#TRPBF

PRODUCTION

LT1791CS#PBF

PRODUCTION

LT1791CS#TRPBF

PRODUCTION

LT1791HS#PBF

PRODUCTION

LT1791HS#TRPBF

PRODUCTION

LT1791IS#PBF

PRODUCTION

LT1791IS#TRPBF

PRODUCTION

Aug 6, 2022

- 22_0173

arrow down

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LT1791ACS#PBF

PRODUCTION

LT1791ACS#TRPBF

PRODUCTION

LT1791AHS#PBF

PRODUCTION

LT1791AHS#TRPBF

PRODUCTION

LT1791AIS#PBF

PRODUCTION

LT1791AIS#TRPBF

PRODUCTION

LT1791CS#PBF

PRODUCTION

LT1791CS#TRPBF

PRODUCTION

LT1791HS#PBF

PRODUCTION

LT1791HS#TRPBF

PRODUCTION

LT1791IS#PBF

PRODUCTION

LT1791IS#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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EVAL-RS485FDEBZ

Standard RS-485 Full-Duplex (14-lead SOIC) Evaluation Board, EVAL-RS485FDEBZ

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EVAL-RS485FDEBZ

Standard RS-485 Full-Duplex (14-lead SOIC) Evaluation Board, EVAL-RS485FDEBZ

Standard RS-485 Full-Duplex (14-lead SOIC) Evaluation Board, EVAL-RS485FDEBZ

Product Detail

The EVAL-RS485FDEBZ allows quick and easy evaluation of full-duplex RS-485 transceivers with standard 14-lead SOIC footprints. The evaluation board allows interfacing via screw terminal block to digital I/O for driver input (DI), receiver output (RO), driver enable (DE) and receiver output (RO). Bus signals A, B, Y and Z (full-duplex bus) can be connected to a bus screw terminal block. Termination resistors are fitted across A and B, as well as Y and Z. These can be connected in half-duplex configuration (A to Y, B to Z), in order to evaluate the RS-485 driver. Footprints are provided for pull-up and pull-down (biasing resistors) on the receiver inputs in order to provide the option to evaluate an RS-485 receiver with this configuration.

Devices for evaluation on the board must be ordered separately.

Tools & Simulations

Tools & Simulations 1

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