ISOW1044BDFMR 5kVrms Isolated CAN FD Transceiver

ElecSuppliers Part Number GuideSep 06, 2026

ISOW1044BDFMR is a Texas Instruments isolated CAN FD transceiver that combines CAN communication, galvanic isolation and an isolated DC-DC power converter in a single device. It supports Classical CAN communication up to 1Mbps and CAN FD data rates of up to 5Mbps.

By integrating the isolated power supply with the CAN transceiver, ISOW1044BDFMR can reduce the number of components required in isolated CAN interfaces. Its low-emissions power architecture is particularly useful for industrial and embedded systems where electromagnetic compatibility and board space are important design requirements.

CAN FD Communication up to 5Mbps

ISOW1044BDFMR is designed around the ISO 11898-2:2016 CAN physical layer requirements. It supports standard Classical CAN networks at up to 1Mbps while providing higher-speed CAN FD communication at 2Mbps and 5Mbps.

The device uses a single CAN transceiver channel with separate transmit and receive logic connections. A typical loop delay of approximately 167ns supports high-speed communication in systems where CAN FD timing is important.

The combination of CAN FD capability and galvanic isolation makes the device suitable for connecting controllers across electrically different ground domains without requiring a separate external CAN isolation stage.

Integrated Isolated DC-DC Converter

A major feature of ISOW1044BDFMR is its integrated isolated DC-DC converter. Instead of using a separate isolated power module together with a conventional CAN transceiver, the device combines both functions into one package.

The power converter operates from a 4.5V to 5.5V VDD supply, while the logic-side VIO supply can operate from 1.71V to 5.5V. VIO and VDD can also be connected together when a single supply voltage is appropriate for the system.

The isolated output provides additional power for external circuitry, with up to 20mA of additional output current available. Typical converter efficiency is approximately 47%, while isolated output voltage accuracy is specified at ±5%.

Low-Emission Power Architecture

ISOW1044BDFMR is designed with electromagnetic compatibility in mind. Its integrated DC-DC converter uses a 25MHz switching architecture intended to reduce unwanted emissions and noise.

The isolated power section can meet CISPR 32 and EN 55032 Class B radiated-emissions requirements with a simple two-layer PCB implementation using appropriate ferrite filtering. This can help simplify EMC design compared with isolated CAN solutions that require a separate high-frequency isolated power supply.

For industrial communication equipment, reducing conducted and radiated noise can be especially important when CAN wiring is located close to sensitive analog, sensor or control circuitry.

5kVrms Galvanic Isolation

ISOW1044BDFMR provides 5kVrms isolation between the logic and CAN sides. The isolation architecture protects the host controller from differences in ground potential and electrical transients appearing on the field side of the CAN network.

The device supports reinforced and basic isolation configurations and provides a minimum creepage and clearance of 8mm in its wide-body package. The isolation system is intended for applications where reliable separation between communication circuitry and higher-voltage or electrically noisy environments is required.

High common-mode transient immunity further supports communication across rapidly changing electrical potentials. The device specifies high CMTI performance, with a typical value reaching 100kV/µs.

CAN Bus Protection and Wake-Up

ISOW1044BDFMR incorporates several protection features for CAN-based systems. The CAN bus interface provides DC fault protection up to ±58V and supports a receiver common-mode voltage range of ±12V.

The bus pins also provide high ESD protection, including IEC 61000-4-2 contact discharge capability. These characteristics are useful for equipment connected to external CAN wiring where electrostatic events and transient conditions can occur.

A standby mode and remote wake-up function are also available. The device can recognize the CAN bus wake-up pattern defined by ISO 11898-2:2016, allowing system designers to reduce power consumption while retaining network wake-up capability.

Additional 10Mbps GPIO Channel

Beyond the isolated CAN interface, ISOW1044BDFMR includes an additional 10Mbps GPIO channel. This channel can be used for functions such as diagnostic signals, LED control or power-supply monitoring.

The integrated GPIO isolation can eliminate the need for an additional optocoupler or digital isolator in some designs. This is useful when the isolated CAN interface also needs to transfer a simple control or status signal between the two electrical domains.

Protection Features for Reliable Operation

ISOW1044BDFMR includes current limiting and thermal shutdown to protect the integrated power circuitry under abnormal operating conditions. The device also incorporates supply undervoltage detection and TXD dominant-timeout protection.

TXD dominant-timeout functionality can help prevent a software or hardware fault from continuously holding the CAN bus in the dominant state. Together with the bus fault protection and thermal protection features, these functions contribute to robust operation in industrial communication equipment.

Package and Operating Range

ISOW1044BDFMR is supplied in a 20-pin wide-body SOIC package using TI's DFM package design. The package provides the physical separation required for the isolated signal and power domains while maintaining a footprint suitable for PCB-based industrial electronics.

The operating temperature range extends from -40°C to +125°C, supporting applications that need reliable CAN communication across a wide environmental range.

Applications for ISOW1044BDFMR

ISOW1044BDFMR is well suited to industrial automation equipment, motor drives, factory control systems, battery management systems, energy-storage equipment, CAN gateways and other embedded systems requiring isolated CAN communication.

It can also be considered for electric vehicle charging equipment, industrial instrumentation and power electronics where CAN FD performance, electrical isolation and low electromagnetic emissions need to be addressed within a compact interface design.

For new isolated CAN FD designs, the integrated DC-DC converter is particularly useful when PCB area and external component count are important. By combining isolated power and communication functions, ISOW1044BDFMR provides a more integrated approach to building high-speed isolated CAN interfaces.