LEM HLSR 32-SM HLSR-SM Series Open Loop Hall Effect Current Transducer
LEM HLSR 32-SM Product Overview
The HLSR 32-SM is an open-loop Hall effect current transducer from LEM's HLSR-SM Series, designed for the electronic measurement of DC and AC currents with galvanic isolation between primary and secondary circuits. This compact surface-mount PCB transducer is optimized for unipolar +5 V supply operation and features a very low profile of only 12 mm with a compact footprint of 3.87 cm².
Rated for 32 A nominal with a measuring range of ±80 A (2.5 × IPN), it outputs a ratiometric analog voltage of 0 to 5 V at nominal current with ±1% accuracy and ±0.5% linearity. Sensitivity is 25 mV/A. Response time is 2.5 µs and frequency bandwidth is 400 kHz. Supply voltage range is 4.5 V to 5.5 V with a maximum current consumption of 25 mA. Operating temperature ranges from -40°C to +105°C. Insulation features 8 mm creepage and clearance distances with CTI 600. The device features bidirectional polarization and surface mount PCB mounting. The product is Active with a 5-year LEM warranty.
LEM HLSR 32-SM Key Specifications
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Parameter |
Value |
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Rated current (IPN) |
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Measuring range (IPM) |
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Output signal |
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Sensitivity |
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Supply voltage (VC) |
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Accuracy |
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Linearity (εL) |
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Response time (tr) |
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Bandwidth (BW) |
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Insulation test voltage (Vd) |
4.3 kV RMS |
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Creepage/Clearance |
8 / 8 mm (CTI 600) |
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Operating temp (TA) |
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Mounting |
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Technology |
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Product Status |
LEM HLSR 32-SM Key Advantages
The HLSR 32-SM employs open-loop Hall effect technology, delivering ±1% accuracy and ±0.5% linearity while providing reinforced galvanic isolation with 8 mm creepage and clearance. The ±80 A measuring range provides significant headroom for overload conditions (2.5 × IPN). The 400 kHz bandwidth and 2.5 µs response time capture dynamic current signals with high fidelity.
Key features include access to voltage reference (overdrivable Uref), providing system-level flexibility for reference voltage synchronization. The single +5 V supply simplifies integration into low-voltage digital systems. The compact surface-mount design occupies only 3.87 cm² of PCB space with a 12 mm height. The device offers low power consumption (25 mA maximum), high immunity to external interference, low offset and gain drift, fixed offset and gain, and no insertion losses. It is factory calibrated and carries a 5-year LEM warranty.
LEM HLSR 32-SM 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
Combiner box and MPPT systems
Solar inverter on DC side of the inverter
Why Choose the LEM HLSR 32-SM?
The HLSR 32-SM combines a 32 A rated current and ±80 A measuring range with ratiometric voltage output in a compact surface-mount package with a single +5 V supply. Manufactured by LEM, it delivers stable, accurate, and safe current measurement for industrial applications. The open-loop Hall effect design offers a cost-effective solution with excellent interference immunity and small footprint. The wide -40°C to +105°C operating temperature range and reinforced insulation ensure reliable performance in demanding environments. The product is Active with a 5-year LEM warranty.
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