Automotive Catalog 70-V Fault-Protected RS-485 Transceivers

Automotive Catalog 70-V Fault-Protected RS-485 Transceivers - SN65HVD1781-Q1


These devices are designed to survive overvoltage faults such as direct shorts to power supplies, mis-wiring faults, connector failures, cable crushes, and tool mis-applications. They are also robust to ESD events, with high levels of protection to the human-body-model specification.

These devices combine a differential driver and a differential receiver, which operate from a single power supply. In the ’HVD1782, the driver differential outputs and the receiver differential inputs are connected internally to form a bus port suitable for half-duplex (two-wire bus) communication. This port features a wide common-mode voltage range, making the devices suitable for multipoint applications over long cable runs. These devices are characterized from –40°C to 125°C. These devices are pin-compatible with the industry-standard SN75176 transceiver, making them drop-in upgrades in most systems.

These devices are fully compliant with ANSI TIA/EIA 485-A with a 5-V supply and can operate with a 3.3-V supply with reduced driver output voltage for low-power applications. For applications where operation is required over an extended common-mode voltage range, see the SN65HVD1785 (SLLS872) data sheet.


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results
    • Device Temperature Grade 1:
      –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H2
    • Device CDM ESG Classification Level C3B
  • Bus-Pin Fault Protection to:
    • > ±70 V (’HVD1780-Q1, ’HVD1781-Q1)
    • > ±30 V (’HVD1782-Q1)
  • Operation With 3.3-V to 5-V Supply Range
  • ±16-kV HBM Protection on Bus Pins
  • Reduced Unit Load for up to 320 Nodes
  • Failsafe Receiver for Open-Circuit, Short-Circuit and Idle-Bus Conditions
  • Low Power Consumption
    • Low Standby Supply Current, 1 µA Maximum
    • ICC 4-mA Quiescent During Operation
  • Pin-Compatible With Industry-Standard SN75176
  • Signaling Rates of 115 kbps, 1 Mbps, and up to 10 Mbps

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Parametrics Compare all products in RS-485/RS-422

Supply Voltage(s) (Nom) (V)
No. of TX
No. of RX
Signaling Rate (Max) (Mbps)
IEC 61000-4-2 Contact (+/- kV)
Fault Protection (V)
Number of Nodes
Common Mode Range
ICC (Max) (mA)
Operating Temperature Range (C)
Package Group
Approx. Price (US$)
SN65HVD1781-Q1 SN65HVD1780-Q1 SN65HVD1781A-Q1 SN65HVD1782-Q1
1    1    1    1   
1    1    1    1   
Half    Half    Half    Half   
1    0.115    1    10   
N/A    N/A    N/A    N/A   
16    16    16    16   
-70 to 70    -70 to 70    -70 to 70    -30 to 30   
320    320    320    64   
-7 to 12    -7 to 12    -7 to 12    -7 to 12   
6    6    6    6   
No    No    No    No   
Automotive    Automotive    Automotive    Automotive   
-40 to 125    -40 to 125    -40 to 125    -40 to 125   
2.35 | 1ku    2.35 | 1ku    2.37 | 1ku    2.07 | 1ku   

Other qualified versions of SN65HVD1781-Q1

Version Part Number Definition
Catalog SN65HVD1781 TI's standard catalog product