Current Sensing Resistors: Resistance Range 0.5 mΩ to 100 mΩ

Component Specifications

Definition

Current sensing resistors, also known as shunt resistors, are low-resistance precision components designed to measure electrical current in a circuit. They operate on Ohm's Law (V=IR), where the voltage drop across the resistor is proportional to the current flowing through it. These components are critical in power regulation circuitry for monitoring, protection, and control applications, providing accurate current measurement for feedback loops in power supplies, motor drives, battery management systems, and overcurrent protection circuits.

Working Principle

Current sensing resistors work based on Ohm's Law. When current flows through the resistor, it creates a proportional voltage drop across its terminals (V = I × R). This voltage signal is then amplified and measured by monitoring circuits (typically operational amplifiers or dedicated current sense amplifiers) to determine the actual current value. The resistor's low resistance value minimizes power loss and heating while maintaining measurement accuracy.

Materials

Manganese-copper alloy (MnCu), Nickel-chromium alloy (NiCr), Copper-manganese-nickel alloy, Aluminum nitride ceramic substrates, Epoxy coating, Tin-plated copper terminals

Technical Parameters

Parameter	Typical range	Notes & selection driver
Tolerance	±0.5% to ±5%
Power Rating	1W to 10W
Voltage Rating	Up to 500V
Resistance Range	0.5 mΩ to 100 mΩ
Operating Temperature	-55°C to +155°C
Temperature Coefficient	±50 ppm/°C to ±200 ppm/°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60115, MIL-PRF-914, JIS C 5201

Parent Products

This component is used in the following industrial products

Power Regulation Circuitry

Electronic circuitry within a PLC processor module that regulates and stabilizes power supply voltages for reliable operation.

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Engineering Analysis

Risks & Mitigation

Thermal runaway due to poor heat dissipation
Measurement inaccuracy from parasitic resistance
Overcurrent damage exceeding power rating
Vibration-induced connection failure

FMEA Triads

Trigger: Insufficient heat sinking or airflow
Failure: Resistor overheating leading to resistance drift or permanent damage
Mitigation: Implement proper thermal management with heatsinks, ensure adequate spacing, use resistors with appropriate power ratings, and monitor temperature during operation

Trigger: Poor solder joints or connection points
Failure: Increased contact resistance causing measurement errors
Mitigation: Use four-terminal (Kelvin) connections, implement proper soldering techniques, perform regular connection integrity checks

Trigger: Exceeding maximum current rating
Failure: Resistor burnout or permanent resistance change
Mitigation: Implement overcurrent protection circuits, use resistors with appropriate current ratings, include current limiting devices

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.5% typical for precision applications, ±1% for standard applications

Test Method

Four-wire Kelvin measurement at specified temperature and current conditions, following IEC 60115 standards

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Current Sensing Resistors

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

JDC RESISTORS CO., LIMITED

Dongguan, Guangdong, CN

Also makes: Precision Current Shunt Resistor, Blower Motor, Current Shunt / CT and 2 more

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “Current Sensing Resistors”
View source page ↗ jdcresistors.com · checked 2026-09-14

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Current Sense Resistor

A precision resistor used to measure current flow in electrical circuits by converting current to a measurable voltage drop.

Frequently Asked Questions

What is the main purpose of current sensing resistors in power regulation?

Current sensing resistors provide accurate current measurement for feedback control in power regulation circuits, enabling precise voltage regulation, overload protection, and efficiency optimization.

How do you select the right current sensing resistor value?

Select based on maximum expected current (to minimize voltage drop and power loss), required measurement accuracy, available amplifier input range, and thermal considerations to prevent overheating.

What are the key differences between current sensing resistors and regular resistors?

Current sensing resistors have much lower resistance values (milliohms), tighter tolerances, lower temperature coefficients, four-terminal (Kelvin) connections for accurate measurement, and are designed to handle higher currents with minimal self-heating effects.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Current Sensing Resistors