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Transient voltage suppressors

Automotive ESD protection for CAN FD

STMicroelectronics has released two dual-line transient voltage suppressors. They were specifically designed for the protection of the automotive CAN lines against electrostatic discharge and are compliant with CAN FD.

The transient voltage suppressors are AEC-Q101 qualified (Photo: STMicroelectronics)

THE CONTINUAL INTRODUCTION of electronics-based features in cars, including various advanced driver assistance systems (ADAS), has led to a proliferation of communications protocols that offer different combinations of speed, cost, and flexibility. Now, STMicroelectronics has introduced two devices that combine protection of CAN network lines against electrostatic discharges (ESD) and other transients and compliance with key automotive interfaces.

The ESDCAN02-2BWY and ESDCAN03-2BWY are automotive-grade dual-line Transil devices. The combination of parameters, including an ultra-low capacitance of 3,5 pF and 24 V minimum stand-off voltage, has produced the world’s first CAN protection devices to comply with major interfaces, including CAN FD, LIN, Flexray, Most, and Sent, according to the company.

The low capacitance leads to a BOM reduction and design simplification for high bit-rates. An SOT323 package helps minimize the PCB area. The ESDCAN02-2BWY with 28 V minimum VBR (reverse breakdown voltage) meets automotive reverse battery requirements, while the ESDCAN03-2BWY’s low VCL (clamping voltage) of 35 V maximum is the best clamping voltage on the market, says the company. Both devices are ISO 10605-compliant, managing ESD surges up to the maximum ±30 kV covered by the standard, ensuring robustness in the application. The devices are available in volume at a price of US$0,078 in quantities of 100 units.