LT1785
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LT1785

60V Fault Protected RS485/RS422 Transceivers

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 26
1ku List Price Starting From $2.40
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 26
1ku List Price Starting From $2.40

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Documentation

Documentation

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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

LT1785ACN8#PBF

PRODUCTION

LT1785AHN8#PBF

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Aug 6, 2022

- 22_0172

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

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LT1785AHN8#PBF

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LT1785AIN8#PBF

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Dec 14, 2023

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1785ACS8#PBF

PRODUCTION

LT1785ACS8#TRPBF

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Jun 16, 2021

- 21_0026

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1785ACS8#PBF

PRODUCTION

LT1785ACS8#TRPBF

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LT1785AHS8#PBF

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LT1785AIS8#TRPBF

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LT1785IS8#TRPBF

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LT1785IS8#WPBF

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LT1785IS8#WTRPBF

PRODUCTION

Oct 12, 2022

- 22_0255

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1785AHS8#WPBF

PRODUCTION

LT1785AHS8#WTRPBF

PRODUCTION

LT1785HS8#WPBF

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LT1785HS8#WTRPBF

PRODUCTION

LT1785IS8#PBF

PRODUCTION

LT1785IS8#TRPBF

PRODUCTION

LT1785IS8#WPBF

PRODUCTION

LT1785IS8#WTRPBF

PRODUCTION

Nov 11, 2021

- 21_0060

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1785AHS8#WPBF

PRODUCTION

LT1785AHS8#WTRPBF

PRODUCTION

LT1785HS8#WPBF

PRODUCTION

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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

LT1785ACN8#PBF

PRODUCTION

LT1785AHN8#PBF

PRODUCTION

LT1785AIN8#PBF

PRODUCTION

LT1785CN8#PBF

PRODUCTION

LT1785HN8#PBF

PRODUCTION

LT1785IN8#PBF

PRODUCTION

Aug 6, 2022

- 22_0172

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

LT1785ACN8#PBF

PRODUCTION

LT1785AHN8#PBF

PRODUCTION

LT1785AIN8#PBF

PRODUCTION

LT1785CN8#PBF

PRODUCTION

LT1785HN8#PBF

PRODUCTION

LT1785IN8#PBF

PRODUCTION

Dec 14, 2023

- 22_0255

arrow down

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1785ACS8#PBF

PRODUCTION

LT1785ACS8#TRPBF

PRODUCTION

LT1785AHS8#PBF

PRODUCTION

LT1785AHS8#TRPBF

PRODUCTION

LT1785AIS8#PBF

PRODUCTION

LT1785AIS8#TRPBF

PRODUCTION

LT1785AIS8#WPBF

PRODUCTION

LT1785AIS8#WTRPBF

PRODUCTION

LT1785CS8#PBF

PRODUCTION

LT1785CS8#TRPBF

PRODUCTION

LT1785HS8#PBF

PRODUCTION

LT1785HS8#TRPBF

PRODUCTION

Jun 16, 2021

- 21_0026

arrow down

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1785ACS8#PBF

PRODUCTION

LT1785ACS8#TRPBF

PRODUCTION

LT1785AHS8#PBF

PRODUCTION

LT1785AHS8#TRPBF

PRODUCTION

LT1785AIS8#PBF

PRODUCTION

LT1785AIS8#TRPBF

PRODUCTION

LT1785AIS8#WPBF

PRODUCTION

LT1785AIS8#WTRPBF

PRODUCTION

LT1785CS8#PBF

PRODUCTION

LT1785CS8#TRPBF

PRODUCTION

LT1785HS8#PBF

PRODUCTION

LT1785HS8#TRPBF

PRODUCTION

LT1785IS8#PBF

PRODUCTION

LT1785IS8#TRPBF

PRODUCTION

LT1785IS8#WPBF

PRODUCTION

LT1785IS8#WTRPBF

PRODUCTION

Oct 12, 2022

- 22_0255

arrow down

Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LT1785AHS8#WPBF

PRODUCTION

LT1785AHS8#WTRPBF

PRODUCTION

LT1785HS8#WPBF

PRODUCTION

LT1785HS8#WTRPBF

PRODUCTION

LT1785IS8#PBF

PRODUCTION

LT1785IS8#TRPBF

PRODUCTION

LT1785IS8#WPBF

PRODUCTION

LT1785IS8#WTRPBF

PRODUCTION

Nov 11, 2021

- 21_0060

arrow down

Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LT1785AHS8#WPBF

PRODUCTION

LT1785AHS8#WTRPBF

PRODUCTION

LT1785HS8#WPBF

PRODUCTION

LT1785HS8#WTRPBF

PRODUCTION

Software and Part Ecosystem

Software and Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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EVAL-RS485HDEBZ

Standard RS-485 Half-Duplex Evaluation Board, EVAL-RS485HDEBZ

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EVAL-RS485HDEBZ

Standard RS-485 Half-Duplex Evaluation Board, EVAL-RS485HDEBZ

Standard RS-485 Half-Duplex Evaluation Board, EVAL-RS485HDEBZ

Product Detail

The EVAL-RS485HDEBZ allows quick and easy evaluation of half-duplex RS-485 transceivers with standard 8-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 and B (half-duplex bus) can be connected to a bus screw terminal block. One or two termination resistors can be connected to A and B via jumper settings, in order to evaluation the half-duplex RS-485 driver and receiver. Footprints are provided for pull-up and pull-down (biasing resistors) on the bus.

Devices for evaluation on the board must be ordered separately.

Tools & Simulations

Tools & Simulations 1

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