While both parts fall under the general umbrella, they are not interchangeable due to different termination and signaling requirements. ISO 11898-2 (High-Speed) ISO 11898-3 (Low-Speed/Fault-Tolerant) Max Speed 1 Mbit/s (up to 5 Mbit/s for CAN FD) 125 kBit/s Topology Linear bus with 120 Ω termination at ends Linear, star, or multi-star with distributed termination Termination 120 Ω resistors at the bus ends Distributed resistors at each node (total ~100 Ω) Fault Resilience Stops if a wire is cut or shorted Continues in single-wire mode if one wire fails Accessing the ISO 11898-3 PDF
| Feature | Specification | | --- | --- | | Data Rate | Up to 125 kbit/s | | Bus Topology | Passive star, line, or mixed (with external bias) | | Transceiver Type | Fault-tolerant (e.g., TJA1054, TJA1055, MC33897) | | Termination | Each node has an internal split termination (typically ~100kΩ pull-up/down), not a single 120Ω resistor | | Voltage Levels (dominant) | CAN_H ~3.6V, CAN_L ~1.4V (differential ~2.2V) | | Voltage Levels (recessive) | Both pins ~2.5V with weak bias | | Fault Scenarios Handled | Wire break, short to GND, short to Vbat, loss of one wire |
The standard is – it is copyrighted by ISO. You can purchase the official PDF from:
The standard covers aspects such as:
The defining characteristic of ISO 11898-3 is its ability to continue communication under specific bus failure conditions. If one of the two data lines (CANH or CANL) is damaged—such as being shorted to ground, shorted to the battery, or cut—the system automatically switches to . This allows the vehicle's body electronics to continue functioning until repairs can be made. Comparison: ISO 11898-3 vs. ISO 11898-2
Do not confuse this with . ISO 11898-3 still uses two wires, but it tolerates the loss of one. Single-wire CAN uses only one wire and runs even slower (~33 kbit/s).
CANH is driven toward the power supply (5 V or 3.3 V), and CANL is driven toward 0 V.
ISO 11898-3 is an international standard that specifies the low-speed, fault-tolerant, medium-dependent interface for CAN bus systems. It defines the requirements for the physical layer of the CAN bus, including the transmission medium, signal level, and signal transmission characteristics.
While both parts fall under the general umbrella, they are not interchangeable due to different termination and signaling requirements. ISO 11898-2 (High-Speed) ISO 11898-3 (Low-Speed/Fault-Tolerant) Max Speed 1 Mbit/s (up to 5 Mbit/s for CAN FD) 125 kBit/s Topology Linear bus with 120 Ω termination at ends Linear, star, or multi-star with distributed termination Termination 120 Ω resistors at the bus ends Distributed resistors at each node (total ~100 Ω) Fault Resilience Stops if a wire is cut or shorted Continues in single-wire mode if one wire fails Accessing the ISO 11898-3 PDF
| Feature | Specification | | --- | --- | | Data Rate | Up to 125 kbit/s | | Bus Topology | Passive star, line, or mixed (with external bias) | | Transceiver Type | Fault-tolerant (e.g., TJA1054, TJA1055, MC33897) | | Termination | Each node has an internal split termination (typically ~100kΩ pull-up/down), not a single 120Ω resistor | | Voltage Levels (dominant) | CAN_H ~3.6V, CAN_L ~1.4V (differential ~2.2V) | | Voltage Levels (recessive) | Both pins ~2.5V with weak bias | | Fault Scenarios Handled | Wire break, short to GND, short to Vbat, loss of one wire |
The standard is – it is copyrighted by ISO. You can purchase the official PDF from:
The standard covers aspects such as:
The defining characteristic of ISO 11898-3 is its ability to continue communication under specific bus failure conditions. If one of the two data lines (CANH or CANL) is damaged—such as being shorted to ground, shorted to the battery, or cut—the system automatically switches to . This allows the vehicle's body electronics to continue functioning until repairs can be made. Comparison: ISO 11898-3 vs. ISO 11898-2
Do not confuse this with . ISO 11898-3 still uses two wires, but it tolerates the loss of one. Single-wire CAN uses only one wire and runs even slower (~33 kbit/s).
CANH is driven toward the power supply (5 V or 3.3 V), and CANL is driven toward 0 V.
ISO 11898-3 is an international standard that specifies the low-speed, fault-tolerant, medium-dependent interface for CAN bus systems. It defines the requirements for the physical layer of the CAN bus, including the transmission medium, signal level, and signal transmission characteristics.