CAB 500-C/SP5 , CAB500-C/SP5

CAB500-C/SP5 Fluxgate Current Sensor – Built for Precision, Freeing Current Measurement from Limitations

CAB500-C/SP5 Core Performance: Ultimate Accuracy and Stability

The CAB500-C/SP5 incorporates LEM’s advanced open-loop fluxgate technology, which uses saturation symmetry of the low-frequency magnetic core to measure current. Compared to conventional Hall-effect sensors, the advantages are clear:

Full-temperature-range accuracy: At room temperature (25°C), accuracy reaches up to ±0.3%. Across extreme temperatures from -40°C to +105°C, measurement error remains within ±0.5% – ensuring reliable current monitoring even in freezing cold or scorching heat.

Ultra-low offset: Offset current is less than 10mA, enabling precise capture of even tiny self-discharge fluctuations when the battery is idle – safeguarding battery health.

Linearity ±0.1% – linear, stable output across the full measurement range, delivering trustworthy data.

Broad Compatibility: Seamless Integration with High-Voltage Systems

The CAB500-C/SP5 is optimized for high-voltage battery management systems and high-power industrial applications:

Rated current 500A – covering mainstream electric vehicle and energy storage system power requirements.

Bidirectional current measurement – accurately captures current changes during both charging and discharging.

Supply voltage 8–16V – perfectly compatible with automotive 12V electrical systems; voltage fluctuations do not compromise measurement accuracy.

Safety & Reliability: Electrical Isolation and Noise Immunity

Safety is the baseline of current measurement. The CAB500-C/SP5 prioritises reliability from the ground up:

2.5kV AC isolation voltage, insulation resistance up to 500MΩ – effectively blocks electrical interference between high-voltage battery packs and low-voltage control systems.

Complies with CISPR 25 EMC standards – stable operation in strong electromagnetic interference environments such as motor drives and wireless charging.

Excellent external noise immunity – maintains stable output even in complex industrial electromagnetic environments.

Intelligent Communication: CAN Bus for Efficient Control

The CAB500-C/SP5 integrates a high-speed CAN bus (up to 500kbps), supports custom CAN IDs and baud rates, and can seamlessly connect to vehicle control units (VCUs) and charging modules. An onboard configurable digital low-pass filter allows users to adjust the filtering frequency according to application needs, eliminating noise and ensuring clean signal transmission.

Flexible Mounting: PCB / Throughhole – Plug & Play

The modular single-aperture package supports PCB and through-hole mounting. Compact and space-saving, with low power consumption (maximum supply current only 40mA–160mA) – it runs cool without adding extra load to the system.

Wide Operating Temperature: -40°C to +105°C – Ready for Any Environment

The CAB500-C/SP5 delivers stable output across an ultra-wide operating temperature range of -40°C to +105°C, whether in the bitter cold of northern winters or the scorching heat of southern summers.

CAB500-C/SP5 Typical Applications

Electric Vehicle Battery Management Systems (BMS)

In BMS applications, the CAB500-C/SP5 can monitor battery charge/discharge currents in real time. With accurate current measurement, the BMS can precisely determine state of charge (SoC), charge/discharge status, and battery health. The sensor integrates an overcurrent detection mechanism – when current exceeds a safe threshold, it sends an alarm signal via the CAN bus within 1ms, triggering the battery thermal management system or disconnecting the high-voltage circuit, preventing overheating or fire risks.

800V High-Voltage Fast Charging Optimisation

In 800V fast-charging scenarios, the CAB500-C/SP5 precisely monitors charging current changes. Working with the BMS, it dynamically adjusts charging power, improving charging efficiency by 12% while limiting battery temperature rise to within 5°C – significantly extending battery cycle life.

Industrial Automation & Control

Widely used in DC motor static converter drives, switch-mode power supplies (SMPS), AC variable speed drives, uninterruptible power supplies (UPS), battery-powered applications, and general-purpose inverters.

CAB500-C/SP5 Technical Specifications

Why Choose the CAB500-C/SP5?

LEM original quality – global leader in current sensors with over 30 years of proven reliability.

In stock – ample inventory from authorised distributors; e.g. DigiKey has 2,000+ units ready for immediate shipment.

Excellent price/performance – typical unit price approx. ¥500–¥605 (tax included, volume discounts available). Premium performance at a mid-range cost.

Widely adopted by industry leaders – already used by BYD, CATL, and many other top EV and energy storage manufacturers worldwide.

Worry-free after-sales support – 10-week standard lead time from factory, comprehensive technical support and datasheets.