WALTER Alloy HFCL-3015 Series Current Sensor Resistor Product Introduction
Date：2025-12-18
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I. Product Overview
The HFCL-3015 series current sensing resistor is an advanced metal-ceramic current sensing resistor component, belonging to the category of four-terminal, no-side electrode, long-electrode products. With a specific standard size, it can accurately meet the application requirements of various current detection scenarios. Its core material is high-quality manganese-copper alloy, which possesses excellent electrical conductivity and stability, laying a solid foundation for precise current sensing.
II. Product Model Interpretation
The coding rule of the HFCL-3015 series product model is clear and easy to understand, with each part having a definite meaning:
(1) Product Series Number: HFCL3015 represents the product type (long electrode, four-terminal, no-side electrode) and corresponding size;
(2) Product Material: M stands for manganese-copper alloy (MnCu alloy), ensuring the excellent performance of the resistor component;
(3) Power Rating: 2W0 indicates that the rated power of this series of products is 2.0 Watt, which can stably withstand the corresponding power load;
(4) Nominal Resistance Value: The resistance range covers 1mΩ - 25mΩ, among which 1mΩ - 4mΩ corresponds to model identifiers R001 - R004, and 5mΩ - 25mΩ corresponds to model identifiers R005 - R025. The clear identification facilitates users' quick selection;
(5) Resistance Tolerance: D represents a tolerance accuracy of ±0.5%, and F represents a tolerance accuracy of ±1%. Users can flexibly choose according to their requirements for detection accuracy.
III. Core Parameters and Specifications
(I) Dimensional Parameters
The HFCL-3015 series products have precise dimensions, with the following specifications for key dimensions:
A: 7.60±0.30mm;
B: 3.80±0.30mm;
C: 0.55±0.20mm;
D: 0.75±0.20mm;
E: 0.60±0.20mm;
T: 0.60±0.20mm.
The precise dimension control ensures the compatibility and adaptability of the product during installation.
(II) Electrical Characteristics
Resistance Range: 1mΩ - 25mΩ. For 1mΩ - 4mΩ, the resistance tolerance is ±1% (F), and the Temperature Coefficient of Resistance (TCR) is ±100ppm; for 5mΩ - 25mΩ, the resistance tolerance can be ±0.5% (D) or ±1% (F), and the TCR is ±50ppm. The excellent electrical performance guarantees the accuracy and reliability of detection data.
Power Rating: 2.0W, which can work stably and continuously under the rated ambient temperature, meeting the power requirements of most application scenarios.
(III) Structure and Materials
Substrate: Alumina Ceramic is adopted, which has good insulation and heat dissipation performance;
Adhesion Layer: Epoxy resin is selected to ensure the firm bonding between various structural layers;
Resistive Element: Copper alloy (Cu - alloy) material endows the product with excellent electrical conductivity and resistance stability;
Terminal Electrode: Composed of tin (Sn), nickel (Ni), and copper (Cu), ensuring the electrical conductivity and oxidation resistance of the electrode;
Protective Coating: Green flame-retardant epoxy resin, meeting UL - 94 - V0 requirements, effectively protecting the resistor component from external environmental influences;
Marking Coating: Black flame-retardant epoxy resin, meeting UL - 94 - V0 requirements, with clear marking facilitating product identification and traceability.
(IV) Environmental and Operating Conditions
Operating Temperature Range: -55℃ ~ 155℃, which can work stably in extreme high and low temperature environments, adapting to various complex working conditions;
Storage Conditions: It can be stored for 2 years in a sealed environment with a temperature of +10℃ ~ 40℃ and a relative humidity of ≤75%; it can be stored for a maximum of 30 days without dew in an environment with a temperature of +10℃ ~ 60℃ and a relative humidity of 95%, facilitating the storage and turnover of products;
Soldering Conditions: The reflow soldering temperature can reach 275±5℃ for a duration of 20±1sec; the soldering iron temperature (hot air equipment) is 350℃ for 3 ~ 5seconds. Various soldering methods such as infrared, vapor phase, and hot air are supported. During soldering, the temperature specifications must be strictly followed to avoid product damage due to excessive temperature.
IV. Product Characteristics and Reliability
The HFCL-3015 series current sensing resistors have undergone a number of rigorous reliability tests and feature stable and reliable performance:
Short Time Over Load Test: Under the environment of 25±2℃, withstand 2.5 times the rated power load for 5 seconds, and the resistance change does not exceed ±(1.0%+0.5mΩ);
High and Low Temperature Tests: Store at -55±2℃ for 1000 hours or at +170±2℃ for 1000 hours, and the resistance change meets the requirement of ±(1.0%+0.5mΩ);
Moisture Load Life Test: Under the environment of 60±2℃ and 95% relative humidity, work for 1000 hours in a cycle mode of 90 minutes on and 30 minutes off, and the resistance change does not exceed ±(2.0%+0.5mΩ);
Thermal Shock Test: After 100 consecutive cycles of -55℃ for 30 minutes, room temperature for 3 minutes, +155℃ for 30 minutes, and room temperature for 3 minutes, the resistance change meets the standard of ±(1.0%+0.5mΩ);
Resistance to Solder Heat and Solderability Tests: Dip into a solder bath at 245±5℃ for 3±0.5 seconds, or pass through a hot air reflow oven at 275±5℃ for 20±1 seconds. The tin coverage area exceeds 95%, and the resistance change meets the requirements;
Mechanical Performance Tests: Withstand 5 mechanical shocks with an acceleration of 100G and an amplitude time of 11ms, or under specific substrate bending conditions, the resistance change does not exceed ±(1.0%+0.5mΩ), indicating strong resistance to mechanical stress.
V. Solder Pad Size and Lot Acceptance Test
(I) Solder Pad Size
To ensure the soldering effect and product performance, the recommended solder pad dimensions are as follows:
P: 2.40mm;
W: 6.60mm;
D: 1.20mm;
V: 0.95mm;
E: 0.45mm;
This size design is suitable for this series of products and can achieve reliable soldering and operation under a limited stable current.
(II) Lot Acceptance Test
Each batch of HFCL-3015 series products (the maximum production quantity per batch does not exceed 500Kpcs) must undergo strict lot acceptance tests to ensure product quality:
Visual Inspection: Observe through a magnifying glass, and the product shall be free from defects such as stains, contamination, marking errors, and damage;
Dimension Detection: Use calibrated measuring tools (such as calipers, micrometers, etc.) for detection to ensure that the dimensions are within the specified range;
Resistance Value Test: Adopt the four-wire resistance test technology at 25℃ to ensure that the resistance value meets the specification requirements;
Temperature Coefficient of Resistance (TCR) Test: Measure the resistance values at 25℃ and 125℃ respectively by the four-wire method, substitute them into the formula to calculate the TCR value, and ensure that it is within the specified range;
Insulation Resistance Test: Use a high ohm meter to measure the insulation resistance between the protective coating and the resistive element, ensuring that it is not less than 100MΩ.
VI. Packaging Information
(I) Packaging Quantity and Weight
Each package of HFCL-3015 series products contains 2000pcs, with a weight of 360±50g, facilitating transportation and storage management.
(II) Reel & Tape Specifications and Sealing Requirements
Reel Specifications: A±5mm is 178mm, N±2mm is 60mm, W1±1mm is 17mm, which is compatible with industry-standard mounting equipment;
Peeling Strength of Seal Tape: The peeling strength is 0.1 - 1.0N (10 - 100gf), and the peeling angle is 165~180°, ensuring the sealing performance and usability of the package.
VII. Conclusion
With precise resistance control, stable and reliable electrical performance, strict quality inspection standards, and wide adaptability to application scenarios, the HFCL-3015 series current sensing resistors have demonstrated outstanding advantages in the field of current detection. Its advanced structural design, high-quality material selection, and comprehensive reliability tests ensure the stable operation of the product in extreme environments and complex working conditions. Whether in industrial control, automotive electronics, power supply equipment and other fields, the HFCL-3015 series current sensing resistors can provide users with accurate and reliable current detection solutions, making them an ideal choice for various current detection applications. In the future, we will continue to uphold the concept of excellence, continuously optimize product performance, and provide customers with higher-quality products and services.
