automotive can bus esd protection

Automotive ESD protection devices for CAN buses


The ESDCAN series improves the quality of protection for CAN-FD (flexible datarate), CAN SIC (signal improvement capability) and even CAN XL (extra-long) transceivers without hurting the capacitance budget and reduces the PCB size by 4 compared to conventional solutions.

The autonomous driving megatrend induces a higher electronics content in the car. It deeply modifies the E/E architecture with the coming of Zone Control Units (ZCU) and Vehicle Computer Units (VCUs). These high-density boards can concentrate tens of CAN links making the need to protect CAN transceivers against electrostatic discharge (ESD) and ISO 7637-3 pulses, and requiring high integrated protection solutions. ST offers a wide range of AEC-Q101 CAN protection devices for passenger cars (12 V battery) or commercial vehicles (24 V battery) covering CAN, CAN-FD, CAN-FD SIC, FlexRay and even CAN XL communication protocols. Our devices are housed in 3-lead SOT23 and SOT323 packages as well as in our new extra-small (1.1 x 1.0 mm) wettable flank 3-lead QFN (DFN1110) package allowing AOI (Automatic Optical Inspection).

Key features

10 year longevity
  • Dual-line ESD and EOS protection
  • Bidirectional devices
  • Maximum pulse current: 5.5 A (8/20 μs)
  • Stand-off voltage: from 24 V up to 36 V
  • Low leakage current: 100 nA (max.)
  • Compliant with:
    • ISO 7637-3a and 3b
    • ISO 10605 / IEC 61000-4-2: up to 30 kV air and contact
    • ISO 16750-2
    • AEC-Q101


  • ESD and EOS plug-and-play protection solutions for CAN transceivers already approved by various car makers
  • Enables high-density PCBs thanks to tiny, compact packages (SOT323-3L, QFN-3L, and DFN1110)
  • Design and layout flexibility with wide range of products with low capacitance
  • Covers most mission profiles with reliability tests performed at maximum Tj =175°C for CAN-FD, Flexray and various voltages to fit car and truck requirements.

Application examples

can controller area network CAN (Controller Area Network)
CAN-FD (Flexible Datarate)
CAN-FD SIC (Signal Improvement Capability)
CAN XL (Extra-Long)
can flexray FlexRay
line capacitance USB 2.0 and IEEE 100BASE-T1

Recommended resources

This 3-minute video provides a clear understanding of CAN bus operation and why surge protection is important. It gives a simple decision flow on how to choose the best protection for your design as well as the reasons to choose ST's ESDCAN devices.

video esdcan esd protection

Controller area network (CAN) communication bus is extremely popular in the automotive industry.
To comply with the high-level of reliability required by the automotive industry and the various surges and standards applicable on CAN links, the CAN transceivers and the electronics components part of the CAN physical layer must be protected by an external TVS.
This application note:

  • Describes the CAN bus electrical parameters. 
  • Details the applicable surges to a CAN node. 
  • Explains the main characteristics of a CAN protection device and how to select the right ESDCAN part number

Discover in this flyer our full range of automotive-grade CAN protection devices that help simplify qualification and speed up time to market.

pdf automotive grade protections can transceivers

Short presentation explains why ESD protections are needed for CAN bus networks and how to select the right ESDCAN solution for your automotive design.

Our new miniature TVS devices protect CAN transceivers without compromising the low clamping voltage

 webinar high power motor drive design

After going over the basics of a CAN bus and typical surges that may occur in automotive applications, this webinar takes a close look the key parameters required for the efficient protection of CAN transceivers.

Take-aways from this on-demand webinar:
  • Overview of a CAN bus topology and its electrical characteristics
  • Examples of typical disturbances in automotive applications and what can happen if a CAN node fails
  • Which parameters are critical for compliance with ISO standards and related issues
  • Designer resources including evaluation boards and design tips