DIODES INC – ESD Protection Diode designed for automotive CAN bus lines Achieves High Surge Protection Over Long Data Lines
Automotive Bus Protection
The most popular communication bus standards currently are the CAN and LIN busses. CAN bus (Control Area Network) is a high speed vehicle bus standard designed to allow microcontrollers and devices within the vehicle to communicate with each other without the need for a host computer. The CAN bus is a differential protocol that is good for (1.0Mbps) and medium-speed (125Kbps) applications in harsh environments. The LIN (Local Interconnect Network) bus standard is a serial network protocol used for communication between components in vehicles that was developed as a low cost alternative to CAN.
Control Area Network (CAN) systems handle everything from power steering to the critical drive-train communications between the engine computer and the transmission.
Local Interconnect Network (LIN) systems handle simple electromechanical functions, such as moving the power seats and toggling the cruise control.
Because CAN/LIN busses are two-wire communication busses for various control and monitor functions inside the vehicle, they have a high chance of getting surges into the two wires and causing failure on the CAN/LIN transceivers. For this reason the data lines need protecting.
Diodes DESD1CAN2SOQ and DESD2CAN2SOQ are bi-directional ESD protection diodes designed to protect two CAN bus lines in common mode from any transient or surge event. The DESD1CAN2SOQ and DESD2CAN2SOQ provide low stand off voltage of 24V, maximum clamping voltage of 41V and low channel capacitance.
A LIN transceiver has a data rate of between 2.4k and 20 bps and a signal of between 24V and -15V and needs protecting by an asymmetrical Bidirectional diode such as the DESD1LIN2WSQ.
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