HLSR20-P
LEM HLSR20-P open-loop Hall current sensor, 20 A RMS nominal with ±50 A range, +5 V supply and through-hole PCB mounting.
The HLSR20-P is a compact LEM open-loop Hall current transducer with a 20 A RMS nominal current and a measuring range of about ±50 A, designed for through-hole printed circuit board mounting. It is part of the HLSR series, a best-selling range in the solar industry, and it combines a very low profile with a single +5 V supply and a voltage output that connects directly to a microcontroller ADC. The open-loop Hall principle keeps the part small, low power and cost-effective while providing galvanic isolation between the primary conductor and the secondary circuit, which protects the control electronics in solar inverters, string combiners, MPPT stages, battery monitoring and general power conversion. The multi-range construction and factory calibration simplify design-in, and access to a voltage reference lets the designer scale the output for the ADC. The wide -40 °C to +105 °C operating range suits outdoor and industrial equipment, and the through-hole footprint is easy to assemble and thermally robust. Typical uses include DC and AC isolated current measurement in solar and energy-storage converters, power supplies and battery management. Every HLSR20-P BeiLuo ships is a genuine LEM part, factory-traceable and supplied with an import declaration, a certificate of origin and a RoHS compliance file, together with our FAE support for layout, isolation and range selection. Its combination of small size, single-supply operation and rugged temperature range makes it a practical choice for high-volume designs.
FAE Professional Review
The HLSR20-P is the sensor we recommend for compact, cost-sensitive designs such as solar string monitoring and MPPT stages. The single +5 V supply and direct voltage output make it fast to design in, and the wide temperature range suits outdoor equipment. Follow the recommended primary track geometry to keep accuracy predictable.
| Parameter | Value |
|---|---|
| Technology | Open-loop Hall |
| Nominal Current | 20 A RMS |
| Measuring Range | ±50 A |
| Supply | +5 V |
| Mounting | PCB through-hole |
| Temperature | -40 °C to +105 °C |
Application Circuits
Solar string and MPPT current sensing
Reference circuits and application schematics for Solar string and MPPT current sensing are available from our FAE team.
Battery monitoring and chargers
Reference circuits and application schematics for Battery monitoring and chargers are available from our FAE team.
Compact power-supply current sensing
Reference circuits and application schematics for Compact power-supply current sensing are available from our FAE team.
Need a reference schematic or design review? Our FAE engineers can share verified circuits and layout guidance for this part.
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Frequently Asked Questions
What makes the HLSR series popular in solar?
The HLSR series combines a very low profile, a single +5 V supply, a direct voltage output and a wide temperature range, which suits string combiners, MPPT stages and battery monitoring where space and cost matter.
Choose the rating that leaves headroom for your peak current.
How do I lay out the primary conductor?
The sense conductor geometry is part of the factory calibration, so follow the recommended copper width and thickness and keep the current path symmetric through the aperture. Avoid long stubs that add parasitic inductance.
Our application notes cover the recommended PCB layout.
Is the part genuine and in stock?
BeiLuo supplies factory-traceable HLSR20-P parts with an import declaration, certificate of origin and RoHS file on every order. The model is normally held in regional stock.
Request a sample for bench validation.