CTM1051
CAN isolated transceiver, 2500VDC isolation, 1Mbps, ISO 11898 compliant, integrated isolated power
Product Overview
Description
The CTM1051 is a high-performance CAN bus isolated transceiver in Aipu's CTM series, featuring integrated signal isolation, power isolation, and CAN transceiver in a single compact module.
This module provides 2500VDC galvanic isolation between CAN bus and logic side, protecting sensitive control electronics from ground loops, common-mode noise, and bus fault conditions. The integrated DC-DC converter generates isolated power, eliminating the need for external isolation power supply.
Compliant with ISO 11898-2 standard, the CTM1051 supports CAN 2.0A and 2.0B protocols with data rates up to 1Mbps. Built-in protection features include ESD protection (HBM 4kV), bus fault protection, and thermal shutdown. Ideal for industrial automation, automotive electronics, medical equipment, and building automation applications requiring reliable CAN communication with isolation.
Product Series
CTM
Primary Application
Industrial automation networks
Key Features
- ISO 11898-2 compliant CAN transceiver
- 2500VDC galvanic isolation
- Integrated isolated DC-DC converter
- CAN 2.0A and 2.0B protocol support
- Data rate up to 1Mbps
- ESD protection HBM 4kV
- Bus fault protection
- Thermal shutdown protection
- Compact PCB mount package
Specifications
| Protocol | CAN 2.0A/B |
|---|---|
| Isolation Voltage | 2500VDC |
| Data Rate | Up to 1Mbps |
| ESD Protection | HBM 4kV |
| Bus Fault Protection | +/-36V |
| Operating Temperature | -40C ~ +85C |
| Package | DIP/SMD |
Applications
Industrial automation networks
Industrial automation and control
Automotive electronics
Automotive and EV electronics
Medical equipment
Medical electronics
Building automation
Industrial automation and control
Power system monitoring
Electronic system design
Process control systems
Industrial automation and control
FAE Expert Insights
"I have deployed CTM1051 in hundreds of industrial automation and automotive applications over the past 8 years. This integrated isolated CAN transceiver is a game-changer for system design. The most significant advantage is the elimination of external isolation power supply - simply connect 5V or 3.3V to the logic side, and the module handles all isolation power generation internally. This saves significant PCB space (typically 50% smaller than discrete solutions) and reduces BOM cost by $2-3 per node. In one large building automation project with over 200 CAN nodes, we used CTM1051 throughout the network. The 2500VDC isolation proved essential in this installation with multiple ground references across different building zones. The modules handled electrical noise from HVAC equipment and elevator systems without any communication errors. The integrated protection features saved several nodes during wiring faults - the bus fault protection prevented damage when technicians accidentally shorted CAN lines during maintenance. I particularly appreciate the consistent performance across temperature - from -20C in outdoor sensors to +60C in equipment rooms, communication remained reliable. For any isolated CAN application, I strongly recommend CTM1051 for its reliability, simplicity, and cost-effectiveness."
No external isolation power needed, 50% PCB space saving, excellent noise immunity, robust protection features
— Chen Hua, BeiLuo
Frequently Asked Questions
Does CTM1051 require external isolation power supply?
No, CTM1051 does not require external isolation power supply. The module integrates a DC-DC converter that generates isolated power (typically 5V) from the logic side power supply (3.3V or 5V) to power the isolated CAN transceiver. This integrated power isolation eliminates the need for: external isolation transformers, separate isolated DC-DC modules, complex isolated power supply design. Simply connect logic side power (VCC) and ground (GND), and the module internally generates isolated power (VISO) for the CAN transceiver side. This significantly simplifies design, reduces PCB space, and lowers BOM cost compared to discrete isolation solutions requiring external power.
No external isolation power needed - module generates isolated power internally. Connect only logic side power (3.3V or 5V).
What is the maximum CAN bus length with CTM1051?
The maximum CAN bus length with CTM1051 depends on data rate: 1) 1Mbps: maximum 40m bus length; 2) 500Kbps: maximum 100m bus length; 3) 250Kbps: maximum 200m bus length; 4) 125Kbps: maximum 500m bus length; 5) 50Kbps: maximum 1000m bus length; 6) 20Kbps: maximum 2500m bus length. These lengths assume proper bus termination (120 ohm resistors at both ends), twisted pair cable, and maximum 30 nodes on the bus. For longer distances, reduce data rate or use CAN repeaters. The CTM1051's high-speed capability (1Mbps) is suitable for short, high-speed industrial networks, while lower speeds enable longer distance applications such as building automation.
Maximum bus length varies with data rate: 40m at 1Mbps, 100m at 500Kbps, up to 2500m at 20Kbps. Use proper termination for reliable operation.
How many nodes can be connected on a CAN bus with CTM1051?
The maximum number of nodes on a CAN bus depends on transceiver input impedance and bus loading: 1) Standard CAN: maximum 32 nodes (using high-speed transceivers like CTM1051); 2) CAN with high-impedance transceivers: up to 64 nodes; 3) CAN with low-power transceivers: up to 128 nodes. The CTM1051 uses standard high-speed CAN transceiver with 1-unit load (typically 5k ohm minimum differential input resistance), supporting up to 32 nodes on a single bus segment. For more nodes, use: 1) CAN bridges/routers to create multiple bus segments; 2) High-impedance transceiver versions (0.5 unit load) supporting up to 64 nodes; 3) CAN repeaters to extend network. In practice, most industrial CAN networks have 8-16 nodes for optimal performance and reliability.
CTM1051 supports up to 32 nodes on standard CAN bus. Use bridges/routers or high-impedance transceivers for larger networks.
What protection features does CTM1051 have?
The CTM1051 includes comprehensive protection features: 1) 2500VDC galvanic isolation: protects logic side from high-voltage faults on CAN bus side; 2) ESD protection: HBM 4kV on CANH/CANL pins protects against electrostatic discharge; 3) Bus fault protection: withstands +/-36V continuous fault on CAN bus pins without damage; 4) Thermal shutdown: disables output if internal temperature exceeds safe limits, automatic recovery when cooled; 5) Short circuit protection: limits current during bus short circuits; 6) Power-on reset: ensures defined startup state. These protections make CTM1051 suitable for harsh industrial environments where wiring faults, ESD events, and electrical noise are common. The module protects both itself and connected equipment from damage.
Comprehensive protection including 2500VDC isolation, 4kV ESD, bus fault protection, and thermal shutdown for harsh industrial environments.
Can CTM1051 be used with 3.3V or 5V logic?
Yes, CTM1051 supports both 3.3V and 5V logic interfaces: 1) CTM1051T version: 3.3V logic level compatible (2.8-3.6V VCC range); 2) CTM1051 version: 5V logic level compatible (4.5-5.5V VCC range). Both versions have identical CAN bus side characteristics and isolation performance. The logic side I/O pins (TXD, RXD) are level-shifted to match VCC voltage. When selecting, match the transceiver logic voltage to your microcontroller or processor I/O voltage: use CTM1051T for 3.3V ARM Cortex, ESP32, etc.; use CTM1051 for 5V Arduino, 8051, etc. The CAN bus side always operates at 5V levels per ISO 11898 standard, regardless of logic side voltage.
CTM1051T for 3.3V logic systems, CTM1051 for 5V logic systems. CAN bus side is always 5V per standard.