LIN is the cheap, slow network for simple parts like seat motors and mirrors. Classic CAN is the workhorse backbone for control units. CAN FD keeps CAN's design but carries up to 64 data bytes and runs its data phase faster. None of the three authenticates senders on its own.
LIN: low cost, master and slave
LIN was created because CAN was considered too expensive for every component. It uses single wire hardware and needs no protocol licence fee. It runs at up to 19.2 kbit/s, or 20 kbit/s in LIN 2.2, over a bus up to 40 meters long.
One master starts every message and up to 15 slaves answer. Slaves never compete for the bus, so no collision handling is needed. Typical uses are roof sensors, steering wheel controls, seat motors, door modules, mirrors and climate panels. LIN complements CAN rather than replacing it, and CAN usually serves as the backbone that connects LIN sub networks.
Classic CAN: the backbone
Classic CAN uses 11 bit or 29 bit identifiers and up to 8 data bytes. It reaches 1 Mbit/s on networks shorter than about 40 m, and slower rates allow longer runs. Nodes arbitrate by identifier, and the lowest identifier wins.
CAN FD: bigger frames, faster data phase
Bosch developed CAN FD in 2011 and released it in 2012. It extends the payload to 64 bytes and adds a bit rate switch so the data phase can run faster than the arbitration phase. Arbitration stays limited to 1 Mbit/s to keep compatibility with classic CAN. The page on CAN FD describes payload rates of 5 to 8 Mbit/s as possible with suitable transceivers, and the CRC was improved to reduce undetected errors.
CAN FD is compatible with existing CAN 2.0 networks, so both can share a network, though higher speeds impose tighter limits on the parasitic capacitance of bus components.
Side by side
| Property | LIN | Classic CAN | CAN FD |
|---|---|---|---|
| Speed | About 20 kbit/s | Up to 1 Mbit/s | Data phase 5 to 8 Mbit/s possible |
| Access method | Master polls | Arbitration by identifier | Arbitration by identifier |
| Typical role | Simple body parts | Control unit backbone | Higher data volume links |
Security reading
For a reviewer, the question is less about speed and more about trust. A compromised LIN master can drive its slaves. A forged CAN frame is accepted by any receiver that listens for that identifier. Faster CAN FD does not change that. Put your effort into gateways, segmentation and application layer checks for the messages that matter, and treat a bigger payload as more room to carry a message authentication code, not as a security feature.
Quick check
Can CAN FD and classic CAN nodes share one bus?
The CAN FD reference describes it as compatible with CAN 2.0 networks, so both can share a network. Check your transceivers and bus limits before mixing them.
Is LIN a replacement for CAN?
No. It is cheaper and slower, and CAN typically connects LIN sub networks.
Sources
Last reviewed: 19 October 2026.
