LF 205-P/SP1 , LF205-P/SP1

LEM LF 205-P/SP1 LF205 Series Closed-Loop Current Transducer

200A Rated Current x ±420A Measuring Range — High-Accuracy PCB-Mount Sensor with Enhanced Fastening for Power Electronics

LEM LF 205-P/SP1 Product Overview

The LF 205-P/SP1 is a closed-loop Hall effect current transducer from LEM's LF205 series, designed for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary and secondary circuits . This compact PCB-mount sensor features a 15.5 mm diameter aperture for the primary conductor and is specifically designed for printed circuit board mounting with molded mounting clips for enhanced fastening to the PCB . The SP1 variant includes two integrated clips to securely fix the product to the PCB, providing additional stability in applications exposed to vibrations and shocks .

Rated for 200 A nominal with a ±420 A measuring range, it outputs a secondary current of 100 mA (instantaneous) with 0.5% accuracy and ±0.1% linearity . The conversion ratio is 1:2000 . Response time is <1 µs and reaction time is <500 ns, with a bandwidth of DC to 100 kHz . Supply voltage range is ±12 V to ±15 V (±5%) . Mass is 58 g and operating temperature is -40°C to +85°C . Insulation test voltage is 3.5 kV . The insulating plastic case is recognized according to UL 94-V0 .

LEM LF 205-P/SP1 Key Specifications

LEM LF 205-P/SP1 Key Advantages

The LF 205-P/SP1 employs closed-loop Hall effect technology, delivering 0.5% accuracy and ±0.1% linearity while maintaining excellent performance with low temperature drift, optimized response time, wide frequency bandwidth, no insertion losses, and high immunity to external interference . The ±420 A range provides generous headroom for measuring nominal currents up to 200 A with transient overcurrent capability, while the <1 µs response time and 100 kHz bandwidth capture fast-changing switching waveforms with high fidelity . The PCB-mount design with 15.5 mm aperture enables direct board integration, and the molded mounting clips provide enhanced mechanical stability in vibration-prone environments . The 3.5 kV insulation and UL 94-V0 recognized housing ensure robust safety isolation for demanding industrial applications . The device conforms to EN 50178 standards .

LEM LF 205-P/SP1 Typical Applications

AC variable speed drives and servo motor drives
Static converters for DC motor drives
Battery supplied applications
Uninterruptible Power Supplies (UPS)
Switched Mode Power Supplies (SMPS)
Power supplies for welding applications

Why Choose the LEM LF 205-P/SP1?

The LF 205-P/SP1 combines a 200 A nominal rating with a ±420 A measuring range and 0.5% accuracy in a compact, PCB-mount package with molded mounting clips for enhanced fastening . Manufactured by LEM, it delivers stable, accurate, and safe current measurement for demanding industrial power conversion and motor control applications. The closed-loop Hall effect design offers excellent accuracy, very good linearity, low temperature drift, and high immunity to external interference, making it a reliable choice for critical systems where measurement integrity is paramount . The SP1 variant's integrated clips provide superior mechanical fixation to the PCB, ensuring robust performance in environments subject to vibrations and shocks . The device is backed by LEM's 5-year guarantee