A flat wire coil inductor is an advanced magnetic component that replaces traditional round magnet wire with a precisely engineered rectangular or “flat” wire. This seemingly simple change in geometry unlocks significant performance advantages, particularly in high-current and high-frequency power applications.
The primary benefit of flat wire is its ability to achieve a much higher copper fill factor within a given winding window. This drastically reduces DC Resistance (DCR), minimizes power loss, and allows the inductor to handle significantly more current without overheating. At JHCOILS, we transform these principles into tangible, reliable components that solve critical engineering challenges.
By eliminating the empty space between turns that exists with round wire, flat wire achieves a superior fill factor. This leads to significantly lower DCR for the same inductance value, reducing I²R power losses and improving overall efficiency.
Lower DCR and a larger conductor surface area for heat dissipation mean our flat wire inductors can handle up to 50% more current than a round wire equivalent of the same size, enabling more compact and powerful designs.
At high frequencies, current flows only on the outer “skin” of a conductor. The large surface area of flat wire provides more skin area than round wire, effectively reducing AC resistance and maintaining efficiency at higher switching frequencies.
Flat wire coil inductors are indispensable in modern power electronics where efficiency, thermal performance, and power density are paramount.
The foundation of our inductors is the premium AIW (Polyamide-imide) flat enameled copper wire we use. This material is chosen for its exceptional properties:
Use conductor width, thickness and length to estimate copper area, DC resistance and copper weight.
Compare conductor sizesOpens in flat-wire mode. Enter bare copper width, thickness and the conductor cross-section corner radius.
With over 20 fully automatic winding machines and a team of expert engineers, our process is optimized for quality, consistency, and speed.
0.2x1.4x4.5x18.75T
0.4x45x20.5x25.5X3T
0.6x8x17x15T
1.2x5x20.5x10T
Standard parts rarely solve complex problems. We specialize in creating custom flat wire coil inductors tailored to your exact needs.
Generally, flat wire shows significant benefits in applications requiring 20A or more. At these levels, the reduction in DCR and improved thermal performance become critical factors for system efficiency and reliability.
Lead times depend on complexity and material availability, but typically, we can deliver initial prototypes within 2 weeks after design finalization.
Yes. While copper is standard due to its higher conductivity, we can and do produce flat wire inductors using enameled aluminum for applications where minimizing weight is the absolute top priority, such as in aerospace.
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