Running high speed signals through CAN bus wiring
![](https://kentindell.github.io/assets/images/canbus-wiring/posrefl-20m-rx20m.png)
CAN bus wiring has a big effect on how fast data can go on CAN. CAN bits are normally 2000ns (2 microseconds, or 500kbit/sec) or longer for slower buses (a J1939 CAN bus runs at 250kbit/sec and can be up to 40m long). But CAN FD has the promise of much faster speeds on conventional CAN bus wiring, up to 8Mbit/sec (i.e. 125ns bit times). Yet most of the automotive industry is using CAN FD at just 2Mbit/sec or even slower. Why is this?
![](https://www.protoexpress.com/wp-content/uploads/2020/09/7-pcb-routing-tips-to-achieve-controlled-impedance-862x1024.jpg)
11 Best High-Speed PCB Routing Practices
![](https://www.datocms-assets.com/53444/1664796407-typical-electrical-wiring-passenger-car.jpg?auto=format&w=1024)
What Is Can Bus (Controller Area Network)
![](https://www.kvaser.com/wp-content/uploads/2020/08/2-canlow1gif.png)
Controller Area Network (CAN BUS) Protocol
CAN Bus Explained - A Simple Intro [2023] – CSS Electronics
101: Controller Area Network (CAN) standard - NXP Community
![](https://www.nwengineeringllc.com/article/img/pcblength-0.png)
Guide to PCB Trace Length Matching in High Speed Design
![](https://www.datocms-assets.com/53444/1664797151-canopen-node.png?auto=format&w=1024)
What Is Can Bus (Controller Area Network)
![](https://www.kmpdrivetrain.com/wp-content/uploads/2017/05/CAN-Bus-wiring-01.png)
Practical tips: CAN-Bus – KMP Drivetrain Solutions
![](https://connectorsupplier.com/wp-content/uploads/CAN-lead-scaled.jpeg)
CAN bus Connector and cable considerations
CAN bus physical layer – Danfoss Editron
![](https://www.protoexpress.com/blog/wp-content/uploads/2020/05/29.png)
11 Best High-Speed PCB Routing Practices
101: Controller Area Network (CAN) standard - NXP Community