YDK is Korea based Litz Wire and Litz Cable manufacturer.

Frequency Data as per AWG size

AWG size is selected by 'Frequency Band' as following data and No. of strands are decided by current amount.

Frequency Recommended Wire Gauge (mm)
60Hz to 1KHz 28AWG 0.32
1KHz to 10KHz 30AWG 0.25
10KHz to 20KHz 33AWG 0.18
20KHz to 50KHz 36AWG 0.12
50KHz to 100KHz 38AWG 0.10
100KHz to 200KHz 40AWG 0.08
200KHz to 350KHz 42AWG 0.06
350KHz to 850KHz 44AWG 0.05
850KHz to 1.4MHz 46AWG 0.04
1.4MHz to 2.8MHz 48AWG 0.03

# Remarks : AWG size is related with Skin effect & Proximity effect which means how much current could flow in the litz wire without resistance and how much effectiveness could influence the induction effect.

Frequency-dependent Skin Effect (based on Copper Conductor)


Skin effect depending on frequency range

Frequency δ
10kHz 0.06mm
50kHz 0.30mm
100kHz 0.21mm
500kHz 0.094mm = 94μm
1MHz 0.066mm = 66μm
10MHz 0.021mm = 21μm
100MHz 0.0066mm = 6.6μm

# Remarks : It is commonly used in applications operating in the frequency range of 10 kHz to 5 MHz. For products operating above these frequency range, new design based on unique specification would be requested. The individually insulated single conductor constitutes the basic component of all litz structures so that currents are evenly distributed through each conductor surface under coating at high frequencies.

As the frequency increases, current flows in the edge region or along the surface of each conductor; this is called the “skin effect”. Skin effect at high frequencies reduces the effective cross-section of each conductor’s ability to carry current. Similar losses at higher frequencies are caused by “proximity effects”, where adjacent electric fields negatively affect the electromagnetic distribution to each other. The twisted structure of Litz wire using multiple individual insulated conductors can effectively minimize these high frequency losses when used in high frequency applications.

These factors should be considered sufficiently at the beginning of the litz wire design. The conversion of a certain part of the elaborate structure is achieved by utilizing a production process based on optimal production parameters and fine-tuned product design, and also guarantees the highest quality and performance in customer products.