STCH6255 - 330uH
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STCH6255 - 330uH

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Product Details
Performance
Features
Applications

      STCH6255-330uH high current power inductor

     1 Appearance and dimensions

    STCH6255-330uH size.jpg


       2 Schematic diagram

       ScreenShot_2026-01-06_134538_130.jpg   

3 Electrical characteristics              

Type No.

inductance
L
μH

DCR
mΩ

Temperature Rise Current
Irms
A

RMS Current
Isat
A

±30%

Max

Max

Max

STCH6255-330uH

330

30

35

25


※1 Inductance is tested at 10KHZ 1V.

※2 Heat rating current: The value of DC current when product temperature rise is ΔT40℃ (Ta=25℃).

※3 Saturation current: The value of DC current when the inductance decreases 30% of its initial value.

※4 All data is tested on 25℃ ambient temperature.

※5 Special remind: Circuit design, component placement, frequency, cooling system and etc. all will

affect the product temperature. Please verify the actuContact Email:linda@e-sitong.comal product

temperature in the final application.

※6 Operating temperature range : -25℃ ～ +125℃ (Including self-temperature rise)

4 Notes

4.1 The best assembly quality guarantee period of product : 12 months (From manufacture date),

Storage condition : seal in packaging, temperature≤40℃, RH≤70%.

4.2 If taking out for use, the remaining products should be sealed in plastic bags and preserved

in accordance with the above conditions, to avoid oxidation of electrodes and affect soldering status.

4.3 Do not keep products in unsuitable storage conditions,

such as areas susceptible to high temperature, high humidity, dust or corrosion.

4.4 Always handle products with care to avoid damage.

4.5 Do not touch electrodes with bare hands directly, as oil secretions may inhibit soldering.

Always ensure optimum conditions for soldering.

4.6 When product will be used on a similar or new project to the original one,

sometimes it might be unable to satisfy the specification due to different condition of usage.

4.7 This proudct itself does not have any protective function in abnormal conditions,

such as overload, high temperature, high voltage and etc.

4.8 Hi-Pot test with higher voltage than spec value will damage insulation material and shorten its life.

4.9 If using in potting compound, the product might be damaged, please consult with us.

4.10 Please do not clean this product. If necessary, please consult with us.

Performance Analysis of Flat Copper Wire High-Current Power Inductors
Flat copper wire high-current power inductors are inductor products optimized for high-current, low-loss scenarios. Their core advantages stem from the structural characteristics of flat copper wire, demonstrating significant performance differences compared to traditional round copper wire inductors in high-current applications.

I. Core Performance Advantages

  1. Low DC Resistance (DCR), Reduced Power Loss
    Flat copper wire offers higher cross-sectional area utilization. For the same wire gauge (cross-sectional area), flat copper wire provides a larger surface area and can be arranged more densely within the bobbin winding slot, reducing gaps between windings.

    • Compared to round copper wire, the DC resistance of a flat copper wire winding can be reduced by 15%~30% for the same inductance value and rated current.

    • Low DCR directly reduces copper loss (P=I²R), improving inductor efficiency. This is particularly suitable for high-current continuous operation scenarios (e.g., new energy vehicle OBCs, server power supplies).

  2. Excellent High-Current Carrying Capacity
    Flat copper wire offers shorter heat dissipation paths and larger surface areas, effectively dissipating the heat generated during winding operation and preventing performance degradation caused by localized overheating.

    • For the same volume, the rated current of a flat copper wire inductor can be 20%~40% higher than that of a round copper wire product.

    • Stronger Anti-Saturation Capability: Flat copper wire can reduce leakage flux by optimizing the winding structure (e.g., layered winding), lowering the risk of core saturation and ensuring stable inductance values under high current.

  3. Low AC Loss, Superior High-Frequency Performance
    At high frequencies, current tends to concentrate on the conductor surface (skin effect). The flat structure of flat copper wire increases the effective conductive area, reducing AC losses caused by the skin effect.

    • When paired with core materials (such as Sendust or nanocrystalline), flat copper wire inductors can maintain low-loss characteristics in the high-frequency range of 100kHz~1MHz.

    • Reduced AC loss helps minimize temperature rise, enhancing product reliability and service life.

  4. Compact Structure, High Power Density
    The dense packing characteristic of flat copper wire can significantly reduce winding volume. For the same power rating, the volume of a flat copper wire inductor can be 20%~30% smaller than that of a round copper wire product. This increases the power density of the power system and aligns with the design trends of miniaturization and lightweighting.

II. Key Performance Parameters and Indicators

Performance Parameter

Characteristics of Flat Copper Wire Inductor

Key Points for Testing/Application


DC Resistance (DCR)

15%~30% lower than round copper wire products

The lower the better, directly affecting efficiency and temperature rise


Rated Current (Irated)

High current carrying capacity with low temperature rise

Must meet the peak and continuous current requirements of practical applications


Inductance Value (L)

Low inductance attenuation rate (<10%) under high current

Ensure stable inductance within the rated current range


Saturation Current (Isat)

Better anti-saturation capability than round copper wire inductors

Avoid sharp inductance drop caused by magnetic core saturation


Temperature Rise (ΔT)

Excellent heat dissipation efficiency, temperature rise controlled within 30~50℃

Long-term reliability in high-temperature environments


High-frequency Loss (Pac)

Less affected by skin effect, low high-frequency loss

Suitable for high-frequency switching power supply scenarios



Core Characteristics of Flat Copper Wire High-Current Power Inductors
Flat copper wire high-current power inductors are inductor products designed for high-current, low-loss applications. Their core characteristics stem from the structural properties of flat copper wire and optimized winding processes, offering significant performance advantages over traditional round copper wire inductors. The specific characteristics are as follows:

Low DC Resistance (DCR) and Reduced Power Loss

The rectangular cross-section of flat copper wire allows for tightly packed windings, significantly reducing gaps between turns and improving copper space utilization. For the same inductance value and rated current, the DC resistance of flat copper wire windings is 15%–30% lower than that of round copper wire. According to Joule's law (P=I²R), this effectively reduces copper losses and enhances the operational efficiency of the inductor, making it particularly suitable for high-current continuous operation scenarios.

Excellent High-Current Carrying Capacity and Superior Anti-Saturation Performance

Flat copper wire provides a larger surface area for heat dissipation and shorter heat conduction paths, enabling rapid dissipation of heat generated during winding operation and preventing localized overheating. Additionally, process optimizations such as layered winding help reduce magnetic leakage interference and lower the risk of core saturation. For the same volume, the rated current of flat copper wire inductors is 20%–40% higher than that of round copper wire products. Moreover, within the rated current range, the inductance value attenuation rate can be controlled within 10%, ensuring stronger performance stability.

Low High-Frequency Loss and Broader Applicable Frequency Range

During high-frequency operation, the skin effect causes current to concentrate on the conductor surface. The flat structure of flat copper wire increases the effective conductive surface area, reducing AC losses caused by the skin effect. When paired with high-performance cores such as Sendust or nanocrystalline, these inductors can maintain low-loss characteristics in the high-frequency range of 100 kHz–1 MHz, meeting the requirements of high-frequency switching power supplies.

Compact Structure and Higher Power Density

The tightly packed nature of flat copper wire significantly reduces winding volume. For the same power rating, flat copper wire inductors are 20%–30% smaller in volume compared to round copper wire products. This effectively enhances the power density of power systems, aligning with the design trends of miniaturization and lightweighting in electronic devices.

Higher Process Requirements and Slightly Higher Cost

The winding, bending, and soldering of flat copper wire are more challenging than those of round copper wire, imposing stricter requirements on production equipment precision and process control. This results in slightly higher manufacturing costs for flat copper wire inductors compared to traditional round copper wire products. Additionally, the rigid nature of flat copper wire windings requires enhanced winding fixation and core bonding processes in high-vibration environments (e.g., automotive and industrial equipment) to prevent loosening and failure.

Higher Reliability and Longer Service Life

Low losses and excellent heat dissipation effectively reduce the operational temperature rise of inductors, slowing down copper oxidation and core aging. The tightly packed winding structure also enhances the product's resistance to vibration and shock, significantly extending its service life in harsh environments such as high temperatures and high vibration.


Core Application Scenarios of Flat Copper Wire High-Current Power Inductors
Flat copper wire high-current power inductors, leveraging their low loss, high current-carrying capacity, and high power density, are primarily suited for fields requiring high-current input/output, high-frequency operation, and stringent efficiency and size requirements. Specific applications include:

New Energy Vehicle Sector

This is a core application scenario for flat copper wire high-current power inductors, primarily used in onboard power conversion and energy management systems:

  • Onboard Charger (OBC): Responsible for converting AC to DC, requiring continuous high-current operation. The low DCR characteristic of flat copper wire inductors reduces copper losses, improves charging efficiency, and their compact size fits the limited space in vehicles.


  • DC-DC Converter: Enables bidirectional conversion between battery voltage and the vehicle's electrical system voltage. High rated current and anti-saturation capabilities ensure stable performance under high-current conditions.


  • Battery Management System (BMS): Used for current detection and filtering. The low-loss characteristic reduces temperature rise, enhancing the safety and reliability of battery charging and discharging.


  • Drive Motor Controller: Handles the high current required for motor operation. The high-frequency, low-loss advantage aligns with the controller's high switching frequency, reducing overall system energy consumption.


Industrial Power Supply and Energy Storage Sector

Suitable for high-power, high-efficiency power equipment and energy storage systems:

  • Server/Communication Power Supplies: Provide stable power for data center servers and communication base stations. The high current-carrying capacity meets the power demands of high-density computing devices, while the compact size helps increase the power density of power modules.


  • Photovoltaic Inverters/Energy Storage Converters (PCS): Convert DC from solar panels or energy storage batteries to AC for the grid. The low-loss characteristic improves energy utilization, and anti-saturation capabilities ensure stable operation during grid fluctuations.


  • High-Power UPS: Provides emergency power to critical equipment during power outages. The high reliability and low temperature rise of flat copper wire inductors meet the demands of prolonged high-current discharge.


Consumer Electronics Fast Charging Sector

Focused on high-power fast charging products, addressing the drawbacks of traditional inductors such as high loss and large size:

  • 100W and Above Fast Chargers: For fast-charging adapters for mobile phones and laptops. The high-frequency, low-loss characteristics of flat copper wire inductors align with the high switching frequency of fast-charging chips, while their compact size enables charger miniaturization.


  • Portable Energy Storage Power Supplies (Outdoor Power Supplies): Require a balance between high-current output and lightweight design. The high power density of flat copper wire inductors effectively reduces power supply volume, enhancing portability for outdoor use.


Rail Transit and Industrial Control Sector

Suitable for industrial scenarios with high vibration and reliability requirements:

  • Rail Transit Traction Converters: Handle the high current for traction motors. The anti-vibration structural design of flat copper wire inductors (requiring reinforced windings) and high current-carrying capacity meet the stringent operating conditions of rail transit.


  • Industrial Frequency Converters: Provide stable current for motor speed control. The low-loss characteristic reduces the temperature rise of frequency converters, improving long-term operational reliability in industrial environments.
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