A new family of six open-loop Hall-effect current sensors delivers accurate, isolated current measurement with analog or digital outputs
Littelfuse, a diversified industrial technology manufacturing company, has released six new automotive current sensors created to advance the performance, efficiency, and functional safety of electric and hybrid vehicles
The new Littelfuse Automotive Qualified Sensors deliver precise, isolated current measurement across battery-management, motor-control, and pyro-fuse safety systems. Using open-loop Hall-effect technology, the sensors provide a reliable performance in compact, bus-bar-mounted form factors. The output configurations include analogue voltage and digital (CAN/LIN) communication, enabling flexibility for system designers to integrate with existing EV architectures.
As EV and hybrid systems evolve, engineers face rising demands for high accuracy, fast response, and compliance with functional-safety standards. This new current-sensor family allows OEMs and Tier 1 suppliers to meet those challenges by providing scalable, ASIL-capable solutions that streamline design, enhance efficiency, and improve safety and system reliability.
In the Automotive Qualified product family, nominal current ranges extend up to ±1500 A, with total-error performance and minimal thermal drift. Models with CAN 2.0B communication features Autosar E2E Profile 1A diagnostics, and ASIL-C-capable current measurement, facilitating integration into safety-critical systems such as disconnect units or battery control.
Product families and key differentiators:
- Battery-Management Sensors – CH1B02xB, CH1B032B, CH1B040B: High-accuracy analog or CAN-based current measurement up to ±1500 A for BMS, DC link, and HV junction boxes.
- Motor-Control Sensors – CH1B02xM, CH1P01xM: Compact, low-noise, ratiometric-analog devices up to ±1500 A (±900 A for CH1P01xM) supporting fast-switching inverter applications.
- Pyro-Fuse Trigger Module – CH1B050P: Intelligent, fast-response design directly triggers the pyro-fuse within microseconds—more than three times faster than conventional architectures.
Applications include:
- Power relay assemblies
- Starter generators
- Battery management systems (BMS)
- Motor inverters
- HV junction boxes
- DC/DC and AC/DC converters
- Pyro-fuse and battery disconnect modules
