Littelfuse Launches Automotive-Qualified Current Sensors for Next-Gen EV and Hybrid Systems
Littelfuse Launches Automotive-Qualified Current Sensors for Next-Gen EV and Hybrid Systems 
As electric and hybrid vehicles continue to push higher voltages, faster switching speeds, and stricter safety requirements, accurate current measurement has become a critical design challenge. To address this, Littelfuse has introduced a new family of automotive-qualified open-loop Hall-effect current sensors designed specifically for EV battery, motor-control, and high-voltage safety systems.
Announced from Littelfuse’s headquarters in Rosemont, Illinois, the new six-device lineup delivers precise, isolated current sensing with both analog and digital output options, giving automotive engineers flexibility as vehicle electrical architectures continue to evolve.
Designed for High-Current, Safety-Critical EV Applications
Modern EV platforms demand more than just current measurement—they require fast response, low drift, and functional-safety compliance. Littelfuse’s new Automotive Qualified Current Sensors are built around open-loop Hall-effect technology and optimized for bus-bar mounting, making them well suited for compact, high-current environments.
Across the family, nominal current ranges extend up to ±1500 A, supporting applications from traction inverters to high-voltage battery disconnect units. Engineers can choose between ratiometric analog voltage outputs or digital CAN/LIN communication, depending on system complexity and safety requirements.
Supporting Functional Safety and Vehicle Reliability
Several devices in the lineup are designed for ASIL-capable systems, helping OEMs and Tier-1 suppliers meet functional-safety requirements without adding unnecessary system complexity.
Models with CAN 2.0B communication include AUTOSAR E2E Profile 1A diagnostics, enabling continuous monitoring of signal integrity and system health. This makes the sensors suitable for safety-critical roles such as battery-management systems (BMS) and high-voltage disconnect modules.
In addition to high accuracy, the sensors offer low thermal drift, ensuring stable current measurement across wide automotive temperature ranges—an increasingly important requirement as EV power densities continue to rise.
Product Families at a Glance
Battery-Management Sensors
CH1B02xB, CH1B032B, CH1B040B
These devices provide high-accuracy current measurement up to ±1500 A with either analog or CAN outputs. Typical use cases include BMS units, DC links, and high-voltage junction boxes.
Motor-Control Sensors
CH1B02xM, CH1P01xM
Optimized for inverter applications, these compact sensors feature low noise and fast response, supporting high-frequency switching. Current ranges reach ±1500 A for CH1B02xM and ±900 A for CH1P01xM.
Pyro-Fuse Trigger Module
CH1B050P
Designed specifically for high-voltage safety systems, the CH1B050P can detect overcurrent conditions and directly trigger a pyro-fuse within microseconds—more than three times faster than traditional signal-path architectures. This rapid response helps mitigate thermal runaway and protect both passengers and battery packs.
Target Applications
- Battery management systems (BMS)
- Motor inverters
- High-voltage junction boxes
- Power relay assemblies
- Starter-generators
- DC/DC and AC/DC converters
- Pyro-fuse and battery disconnect modules
Part of a Broader EV Power-Protection Ecosystem
Littelfuse positions these current sensors as complementary components within its broader high-voltage protection and power-control portfolio, which includes fuses, contactors, thyristors, and TVS diodes. Together, these devices enable system-level solutions that simplify EV and hybrid-vehicle design while improving safety and reliability.
