HMS 20-P Hall Effect Current Sensor Equivalent & Substitute Parts

Part Overview

The HMS 20-P is a Hall Effect open-loop bidirectional current sensor manufactured by LEM USA Inc., designed for AC/DC current measurement applications with a 20A sensing range. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

The HMS 20-P operates as a ratiometric voltage output module, providing precise current measurement across a wide frequency spectrum from DC to 50kHz. Its surface-mount module packaging and 5V supply voltage make it suitable for integration into industrial measurement and control systems.

Substiute Parts

HMS 20-P

LEM USA Inc.In Stock: 1118HMS 20-P Datasheet

Current PartRFQ

HMS 10-P

LEM USA Inc.In Stock: 1332HMS 10-P Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HMS 20-P is determined by strict adherence to the following critical parameters:

Primary Substitution Criteria:

• Sensor Type: Hall Effect, Open Loop
• Output Configuration: Ratiometric, Voltage
• Supply Voltage: 5V
• Frequency Response: DC ~ 50kHz minimum
• Linearity: ±0.5% or better
• Accuracy: ±1% or better
• Response Time: 5µs or faster
• Polarization: Bidirectional
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 85°C minimum
• Number of Channels: 1
• RoHS Compliance: Required

Current Sensing Range Consideration: The HMS 20-P is rated for 20A current sensing. Substitute parts with lower current sensing ratings (such as 10A) are classified as parametric equivalents rather than direct replacements. These lower-rated sensors maintain identical electrical characteristics, compliance certifications, and output behavior but operate within a reduced current measurement window. Selection of a lower-rated substitute requires system-level verification that the actual current load does not exceed the substitute part's rating.

Parameter Comparison

Engineering Selection Recommendations

HMS 10-P as Parametric Equivalent:

The HMS 10-P qualifies as a parametric equivalent to the HMS 20-P based on identical electrical specifications, output characteristics, and regulatory compliance across all parameters except current sensing range. Both components are manufactured by LEM USA Inc. within the HMS series and share identical:

• Hall Effect open-loop sensor architecture
• Ratiometric voltage output configuration
• 5V supply voltage requirement
• DC to 50kHz frequency response capability
• ±0.5% linearity and ±1% accuracy specifications
• 5µs response time
• Bidirectional current measurement capability
• Surface-mount module packaging
• RoHS compliance and REACH unaffected status
• Operating temperature range of -40°C to 85°C

Current Sensing Range Limitation:

The HMS 10-P operates with a maximum current sensing rating of 10A, compared to the HMS 20-P's 20A rating. This represents a 50% reduction in the maximum measurable current. Selection of the HMS 10-P is appropriate only in applications where the actual current load does not exceed 10A. In systems where current measurement requirements may approach or exceed 10A, the HMS 20-P remains the appropriate component selection.

Regulatory and Compliance Status:

Both the HMS 20-P and HMS 10-P maintain identical RoHS compliance and REACH unaffected status, ensuring compatibility with current environmental and regulatory requirements. Both components are classified as obsolete products, indicating that neither part is in active production. Inventory availability should be confirmed through authorized LEM USA Inc. distributors prior to component procurement.

Frequently Asked Questions (FAQ)

Q: Can the HMS 10-P be used as a direct replacement for the HMS 20-P in all applications?

A: The HMS 10-P is a parametric equivalent with identical electrical and output characteristics, but with a reduced current sensing range of 10A versus 20A. Direct replacement is possible only in applications where the measured current does not exceed 10A. Applications requiring measurement of currents between 10A and 20A require the HMS 20-P or an alternative 20A-rated sensor.

Q: What is the difference between the HMS 20-P and HMS 10-P?

A: The primary difference is the current sensing range. The HMS 20-P measures currents up to 20A, while the HMS 10-P measures currents up to 10A. All other specifications—including sensor type, output configuration, supply voltage, frequency response, accuracy, linearity, response time, temperature range, and compliance certifications—are identical between the two models.

Q: Are both the HMS 20-P and HMS 10-P still in production?

A: Both components are classified as obsolete products and are no longer in active production. Availability is limited to existing inventory held by authorized distributors. Procurement should be initiated through established supply channels with confirmation of stock availability.

Q: Do the HMS 20-P and HMS 10-P have the same pinout and mounting footprint?

A: Both components are surface-mount modules within the HMS series. While the provided specifications confirm identical mounting type and package classification, detailed pinout and physical footprint information is not included in the available technical parameters. Physical compatibility should be confirmed through detailed mechanical drawings and pinout diagrams from LEM USA Inc. prior to PCB layout or component substitution.

Q: What is the output voltage range for these sensors?

A: Both the HMS 20-P and HMS 10-P provide ratiometric voltage output. The specific output voltage range is not included in the provided technical parameters. Output voltage specifications should be obtained from the complete HMS series datasheet from LEM USA Inc.

Q: Are there any other HMS series sensors that could serve as alternatives?

A: The provided substitute list includes only the HMS 10-P. Additional alternatives within the HMS series may exist but are not documented in the available technical parameters. Comprehensive alternative options should be obtained from LEM USA Inc. or authorized distributors.

Q: What is the significance of the 5µs response time?

A: The 5µs response time indicates the sensor's ability to detect and respond to changes in current measurement. Both the HMS 20-P and HMS 10-P share this identical response time specification, ensuring equivalent dynamic measurement performance in applications requiring fast current transient detection.

Q: How does the ±0.5% linearity specification affect measurement accuracy?

A: Linearity of ±0.5% indicates the maximum deviation of the output signal from an ideal linear relationship across the full current measurement range. Combined with the ±1% accuracy specification, this ensures predictable and consistent measurement performance across the operating range. Both the HMS 20-P and HMS 10-P maintain identical linearity specifications.