CAN ESD protection devices meet key automotive interface protocols

July 08, 2015 // By Graham Prophet
STMicroelectronics has introduced two devices that combine superior protection of CAN (Controller Area Network) bus lines against electrostatic discharges and other transients and compliance with all key automotive interfaces.

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, notes ST, introducing the ESDCAN02-2BWY and ESDCAN03-2BWY automotive-grade dual-line Transil devices that build on ST’s long-term transient protection device expertise. A combination of parameters, including an ultra-low capacitance of 3.5 pF and 24V minimum stand-off voltage, has produced the first CAN protection devices to comply with all major interfaces, including CAN-FD, LIN, FlexRay, MOST, and SENT.

Features of the devices include:

- Low capacitance (3.5 pF, max), leading to a BOM reduction and design simplification for high bit-rates.

- An SOT323 package, smaller than all existing solutions, that helps minimise PCB area.

- ESDCAN02-2BWY with 28V minimum VBR meets automotive reverse battery requirements.

- ESDCAN03-2BWY’s very low VCL of 35V max is the best clamping voltage on the market.

Both devices are ISO10605-compliant, managing ESD surges up to the maximum ±30kV covered by the standard, ensuring robustness in the application. In an SOT323-3L package, the devices cost $0.078 (100).