40-Mbps, half-duplex, isolated RS-485 & RS-422 transceiver


Product details


Duplex Half Data rate (Max) (Mbps) 40 Isolation rating (Vrms) 2500 Integrated isolated power No Operating temperature range (C) -40 to 85 Fail safe Idle, Open, Short HBM ESD (kV) 16 Surge voltage capability (Vpk) 4000 open-in-new Find other Isolated RS-485 transceivers

Package | Pins | Size

SOIC (DW) 16 77 mm² 10.3 x 7.5 open-in-new Find other Isolated RS-485 transceivers


  • Meets or Exceeds the Requirements of
    EN 50170 and TIA/EIA-485-A
  • Signaling Rates up to 40 Mbps
  • Differential Output Exceeds 2.1 V (54-Ω Load)
  • Low Bus Capacitance – 10 pF (Maximum)
  • Up to 160 Transceivers on a Bus
  • 50 kV/µs Typical Transient Immunity
  • Fail-Safe Receiver for Bus Open, Short, Idle
  • 3.3-V Inputs are 5-V Tolerant
  • Bus-Pin ESD Protection
    • 16-kV HBM Between Bus Pins and GND2
    • 6-kV HBM Between Bus Pins and GND1
  • Safety and Regulatory Approvals
    • 4000-VPK Isolation, 560-VPK VIORM per DIN V
      VDE V 0884-10 (VDE V 0884-10): 2006-12
      and DIN EN 61010-1
    • 2500 VRMS Isolation Rating per UL 1577
    • 4000 VPK Isolation Rating per CSA CA5A and
      IEC 60950-1
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The ISO1176 device is an isolated differential line transceiver designed for use in PROFIBUS applications. The device is ideal for long transmission lines because the ground loop is broken to provide for operation with a much larger common-mode voltage range. The symmetrical isolation barrier of each device is tested to provide 2500 VRMS of isolation per UL between the line transceiver and the logic level interface.

The galvanically isolated differential bus transceiver is an integrated circuit designed for bidirectional data communication on multipoint bus-transmission lines. The transceiver combines a galvanically isolated differential line driver and differential input line receiver. The driver has an active-high enable with isolated enable-state output on the ISODE pin (pin 10) to facilitate direction control. The driver differential outputs and the receiver differential inputs connect internally to form a differential input/output (I/O) bus port that is designed to offer minimum loading to the bus allowing up to 160 nodes.

The PV pin (pin 7) is provided as a full-chip enable option. All device outputs become high impedance when a logic low is applied to the PV pin. For more information, see the function tables in Device Functional Modes.

Any cabled I/O can be subjected to electrical noise transients from various sources. These noise transients can cause damage to the transceiver and/or nearby sensitive circuitry if they are of sufficient magnitude and duration. The ISO1176 can significantly reduce the risk of data corruption and damage to expensive control circuits.

The device is characterized for operation over the ambient temperature range of –40°C to +85°C.

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Pin-for-pin with same functionality to the compared device.
ISO1450 ACTIVE EMC protected, 50-Mbps, half-duplex, 5-kVrms isolated RS-485 & RS-422 transceiver This updated device has a higher isolation rating, increased transceiver EMC protection, wider supply range and stronger CMTI

Technical documentation

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Type Title Date
* Data sheet ISO1176 Isolated RS-485 Profibus Transceiver datasheet (Rev. E) Jun. 30, 2015
Certificate VDE Certificate for Basic Isolation for DIN VDE V 0884-11:2017-01 (Rev. S) Aug. 03, 2021
Certificate CSA Certification (Rev. Q) Jun. 14, 2021
White paper Distance Through Insulation: How Digital Isolators Meet Certification Requiremen Jun. 11, 2021
Application note How to Isolate RS-485 for Smallest Size and Highest Reliability (Rev. B) May 27, 2021
Application note How to Isolate Signal and Power for an RS-485 System (Rev. C) May 25, 2021
Application note Robust Isolated RS-485 Enables New Industrial Applications (Rev. B) May 25, 2021
Certificate UL Certification (Rev. O) Feb. 03, 2021
Application note Isolated RS-485 Transceiver Reference Design May 10, 2019
More literature Blog: Top 7 design questions about isolated RS-485 transceivers Aug. 06, 2018
User guide ISO1176EVM Aug. 12, 2008

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The EVM can be used to evaluate device parameters while acting as a guide for board layout. The board allows the connection of a 50 ohm coaxial cable (via an SMA connector) to connect to instrumentation, or to 54-ohm controlled impedance cable of varying lengths (via a female header or (...)

  • 4000-VPEAK Isolation
  • Bus-Pin ESD Protection
    • 16 kV HBM Between Bus Pins and GND2
    • 6 kV HBM Between Bus Pins and GND1
  • Meets or Exceeds the Requirements of EN 50170 and TIA/EIA-485
  • Signaling Rates up to 40 Mbps
  • Differential Output Exceeds 2.1 V (54 ohm Load)
  • Differential Output Exceeds 2.1 V (54 ohm Load)
  • Low (...)

Design tools & simulation

SLLC327.ZIP (18 KB) - IBIS Model
SLLC328.ZIP (19 KB) - IBIS Model

Reference designs

Low-Power, Low-Noise Analog Front End Design for Circuit Breakers (ACB/MCCB-ETU)
TIDA-00128 This reference design is intended for use in molded case circuit breakers (MCCB) electronic trip units.  The op amp based design acts as current monitoring for over-current earth fault relays. Utilizing a low cost op amp, this design provides a pick-up (A) accuracy ±10 % and time delay (...)
document-generic Schematic document-generic User guide
Analog Front End for Motor Electronic Overload Relays with Enhanced Current Range
TIDA-00191 This reference design is the analog front end (AFE) for an electronic overload relay, used for monitoring and protecting motors from overcurrent or undercurrent events. It is an ideal tool for developers creating overload relays for sensitive AC motors in industrial applications. This programmable (...)
document-generic Schematic
High Efficiency Isolated CAN & Profibus Interface Reference Design
TIDA-00012 The high-efficiency isolated CAN and Profibus interface reference design is intended for use in industrial systems that require isolated power for CAN and/or Profibus transceivers. This design highlights the ability to completely shut off both the power converter and data transceivers with just one (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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SOIC (DW) 16 View options

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