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STN1110 Multiprotocol OBD II to UART Interpreter

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  • STN1110 OBD to UART interpreter IC: PDIP, SOIC, and QFN packages
  • STN1110 SPDIP-28
  • STN1110 SOIC-28 300 mil
  • STN1110 QFN-28-S
  • STN11xx Sleep/Wakeup Triggers

STN1110 Multiprotocol OBD II to UART Interpreter

Part number: 3651

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Availability: In stock

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Quick Overview

Please note: Orders of 100pcs or more may require a lead time of 6-8 weeks.

STN1110 is a multiprotocol OBD to UART interpreter ("OBD chip") that supports all OBD-II protocols, and is fully compatible with the ELM327 command set, while outperforming the original ELM327 IC in every category: stability, performance, features, and price.

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  • Buy 10 for $9.49 each and save 6%
  • Buy 100 for $8.49 each and save 16%
  • Buy 1000 for $7.65 each and save 24%
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Product Description



On-Board Diagnostics, Second Generation (OBD-II) is a set of standards for implementing a computer based system to control emissions from vehicles. It was first introduced in the United States in 1994, and became a requirement on all 1996 and newer US vehicles. Other countries, including Canada, parts of the European Union, Japan, Australia, and Brazil adopted similar legislation. A large portion of the modern vehicle fleet supports OBD-II or one of its regional flavors.

Among other things, OBD-II requires that each compliant vehicle be equipped with a standard diagnostic connector (DLC) and describes a standard way of communicating with the vehicle’s computer, also known as the ECU (Electronic Control Unit). A wealth of information can be obtained by tapping into the OBD bus, including the status of the malfunction indicator light (MIL), diagnostic trouble codes (DTCs), inspection and maintenance (I/M) information, freeze frames, VIN, hundreds of real-time parameters, and more.

STN1110 is an OBD to UART interpreter that can be used to convert messages between any of the OBD-II protocols currently in use, and UART. It is fully compatible with the de facto industry standard ELM327 command set. Based on a 16-bit processor core, the STN1110 offers more features and better performance than any other ELM327 compatible IC.

Feature Highlights

  • Fully compatible with the ELM327 AT command set
  • Extended ST command set
  • UART interface (baud rates from 38 bps to 10 Mbps)
  • Secure bootloader for easy firmware updates
  • Superior automatic protocol detection algorithm
  • Large memory buffer
  • Voltage input for battery monitoring
  • Available in SPDIP, SOIC and QFN-S packages
  • RoHS compliant

Supported Protocols

  • all legislated OBD II protocols:
    • ISO 15765-4 (CAN)
    • ISO 14230-4 (Keyword Protocol 2000)
    • ISO 9141-2 (Asian, European, Chrysler vehicles)
    • SAE J1850 VPW (GM vehicles)
    • SAE J1850 PWM (Ford vehicles)
  • non-legislated OBD protocols:
    • ISO 15765
    • ISO 11898 (raw CAN)
  • SAE J1939 OBD protocol used in heavy-duty vehicles


  • Solid, field-tested software. STN1110 runs the same proven code that powers the popular OBDLink family of PC-based OBD interfaces. Thanks to its large user base, any problems are discovered and corrected quickly.
  • Large OBD message buffer. STN1110 has over five times as much RAM as its nearest competitor, virtually eliminating BUFFER OVERFLOW errors.
  • Automatic protocol detection algorithm is continuously fine-tuned to insure that STN1110 will connect to the widest array of vehicles, even those that do not fully conform to the OBD standard.

PowerSave Sleep/Wakeup Triggers

The diagram shows the various triggers available in the STN11xx family of ICs. Please refer to the STN11xx PowerSave Functionality documentation for more details.

STN11xx Sleep/Wakeup Triggers


STN1110 Datasheet
STN1100 Family Reference Manual
STN1110 vs ELM327 Comparison
Firmware Updates
STN11xx PowerSave Functionality

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