CA-IS3430
Isolated CAN transceiver with 5kVrms isolation, CAN FD support up to 5Mbps, and comprehensive fault protection
Product Overview
Description
CA-IS3430 is a high-performance isolated CAN transceiver featuring reinforced isolation rated at 5kVrms. The device supports both classic CAN (up to 1Mbps) and CAN FD (up to 5Mbps).
With comprehensive fault protection and high CMTI, this transceiver is ideal for automotive and industrial CAN networks requiring isolation.
The device includes dominant timeout protection, thermal shutdown, and ESD protection for reliable operation in harsh environments.
Product Series
CA
Primary Application
Automotive CAN networks
Key Features
- 5kVrms reinforced isolation
- CAN FD support up to 5Mbps
- Classic CAN compatible
- ±16kV ESD protection
- ±58V fault protection
- Dominant timeout protection
- Thermal shutdown
- Low power standby mode
Specifications
| Protocol | CAN 2.0B, CAN FD |
|---|---|
| Isolation Voltage | 5kVrms (reinforced) |
| CAN FD Data Rate | Up to 5Mbps |
| Classic CAN Rate | Up to 1Mbps |
| Bus Protection | ±16kV ESD, ±58V fault |
| CMTI | >100kV/μs |
| Supply Voltage | 3.3V or 5V (logic side) |
| Package | SOIC-16, QSOP-16 |
Applications
Automotive CAN networks
Automotive and EV electronics
Industrial automation
Industrial automation and control
Battery management systems
Battery and charging management
Motor drives
Motor drive and control systems
Charging stations
Battery and charging management
Medical equipment
Medical electronics
Aerospace systems
Electronic system design
FAE Expert Insights
"CA-IS3430 is an excellent isolated CAN solution for both automotive and industrial applications. The CAN FD support up to 5Mbps is essential for modern automotive networks requiring higher bandwidth. I've used this part in BMS applications where isolation is critical for safety. The high CMTI ensures reliable communication in noisy EV environments. The device is fully compatible with standard CAN controllers and works seamlessly with other CAN transceivers on the bus. For automotive applications, the device meets AEC-Q100 requirements. I recommend proper termination (120Ω at both ends) and using twisted pair cable for best EMC performance."
CAN FD support with 5kVrms isolation for automotive and industrial
— Dr. Chen Wei, BeiLuo
Frequently Asked Questions
What is the difference between CAN 2.0 and CAN FD?
CAN FD (Flexible Data-rate) is an enhanced version of CAN 2.0: Data rate: CAN 2.0 limited to 1Mbps; CAN FD supports up to 5Mbps or higher; Data length: CAN 2.0 max 8 bytes per frame; CAN FD supports up to 64 bytes; Frame format: CAN FD uses modified frame format with extra bits; Compatibility: CAN FD controllers can communicate with CAN 2.0 nodes (at 2.0 speeds). CA-IS3430 supports both protocols. For mixed networks, CAN FD nodes fall back to CAN 2.0 mode when communicating with legacy nodes. CAN FD is increasingly adopted in automotive for higher bandwidth.
Use CAN FD for new designs requiring higher bandwidth. Contact our FAE team for CAN FD migration.
How do I terminate a CAN bus with CA-IS3430?
CAN bus termination differs from RS-485: Use 120Ω termination at both ends of the bus; Use split termination (two 60Ω resistors with capacitor to ground) for better EMI; Do not place termination at intermediate nodes; For short buses (<10 nodes, <10m), single termination may work. Split termination: Two 60Ω resistors in series between CANH and CANL; Center tap connected to ground through 4.7nF capacitor; Provides better common-mode filtering. CA-IS3430 works with both standard and split termination. Proper termination is critical for reliable CAN communication.
Use 120Ω or split termination at both bus ends. Contact our FAE team for CAN termination guidelines.
What is dominant timeout protection in CA-IS3430?
Dominant timeout protection prevents permanent bus lockup if a faulty node holds the bus dominant (logic low). If the bus is dominant for longer than timeout period (typically 1-3ms), the driver is disabled, releasing the bus. This protects against: Faulty transceivers stuck in dominant state; Software errors keeping transmitter enabled; and Wiring faults causing permanent dominant condition. After timeout, the driver can be re-enabled by toggling the TXD pin. This feature is required for CAN standards compliance and ensures bus recovery from fault conditions.
Dominant timeout is automatic protection. Contact our FAE team for fault protection details.
Can CA-IS3430 be used in 3.3V systems?
Yes, CA-IS3430 supports both 3.3V and 5V logic levels on the controller side (VCC1). The logic I/O pins (TXD, RXD, STB) are 3.3V and 5V compatible. The isolated side (VCC2) should be 5V for proper CAN bus levels (CANH = 3.5V, CANL = 1.5V dominant). For 3.3V microcontroller systems: Connect VCC1 to 3.3V; Connect VCC2 to 5V (isolated); and Logic levels are automatically compatible. This makes CA-IS3430 ideal for modern 3.3V microcontroller-based systems while maintaining standard CAN bus voltage levels.
CA-IS3430 works with 3.3V and 5V logic. Contact our FAE team for mixed-voltage design.
What is the maximum number of nodes in a CAN network with CA-IS3430?
Theoretical maximum for CAN networks is determined by the electrical load: Standard CAN allows up to 32 nodes (assuming 1 unit load each); CA-IS3430 is less than 1 unit load, allowing more nodes; Practical maximum is typically 64-110 nodes depending on transceiver loading; Bus length and data rate also limit node count. For large networks: Use low-unit-load transceivers like CA-IS3430; Keep bus length within specifications; Use proper termination; and Consider CAN bridges/routers for very large networks. Most automotive and industrial networks have 8-32 nodes.
CA-IS3430 supports large networks. Contact our FAE team for network sizing.
How do I handle ground loops in isolated CAN networks?
CA-IS3430's integrated isolation eliminates ground loops between nodes. Each node has: Local ground reference for controller side; Isolated ground for CAN bus side; and No DC connection between grounds. This allows nodes with different ground potentials to communicate without issues. For the entire network: Connect CAN_GND at each node to local system ground; Do not connect CAN_GND between nodes (isolation prevents this); Use shielded cable with shield grounded at one end; and Isolation barrier handles common-mode voltage differences. This topology prevents ground loop currents while maintaining signal integrity.
Isolation eliminates ground loops automatically. Contact our FAE team for CAN grounding guidelines.