A new range of automotive-qualified current sensors is addressing the growing need for accurate, isolated current measurement across EV battery, motor, and safety systems.
A newly launched family of automotive-qualified current sensors by Littelfuse is aiming to simplify current measurement in electric and hybrid vehicles, as powertrain architectures become more complex and safety-critical. Designed for use across battery management, motor control, and high-voltage protection systems, the sensors focus on delivering accuracy, fast response, and functional safety compliance in compact form factors.
At the heart of the portfolio is open-loop Hall-effect sensing, which enables isolated current measurement without direct electrical contact. This makes the devices well suited for high-voltage EV environments, where galvanic isolation and thermal stability are essential. The sensors support both analog voltage outputs and digital communication over CAN or LIN, allowing designers to match sensing approaches with system requirements.
The key features are:
- Open-loop Hall-effect isolated current sensing
- Measurement ranges up to ±1500 A
- Analog voltage or CAN/LIN digital outputs
- Functional-safety-ready diagnostics for critical systems
- Microsecond-level response for pyro-fuse triggering
Current measurement capability scales up to ±1500 A, covering demanding applications such as traction inverters, DC links, and battery disconnect units. Low total error and minimal thermal drift help improve energy efficiency and system reliability, particularly under wide temperature variations typical of automotive operation.
Functional safety is a key focus. Digital variants support safety-oriented diagnostics aligned with automotive standards, enabling use in safety-critical subsystems such as battery control units. This reduces the burden on system designers who must meet stringent safety targets while keeping architectures compact and cost-effective.
Beyond conventional sensing, the portfolio also includes a fast-acting solution for pyro-fuse triggering. By detecting overcurrent events and directly activating the fuse within microseconds, the design significantly shortens response time compared to traditional signal paths, helping limit damage during fault conditions.
The sensors are intended for straightforward integration into existing EV platforms through busbar or PCB mounting, making them suitable for both new designs and upgrades. Typical target applications include battery management systems, motor inverters, high-voltage junction boxes, power converters, and battery disconnect modules. Together, the devices reflect a broader push toward tighter integration of sensing, safety, and control in next-generation electric vehicles.
