Helical coils

Flat Helical windings are popular in application where a high stacking ratio is required. It has good thermal properties and low skin effects in high frequency applications due to large surface area and shallow skin depth. It is commonly used in high current inductors, common mode chokes, differential mode chokes, power factor correction inductors and transformers. Other application includes motor windings, etc.

Helical coil CPH4 - dimensions ±20%
OD - output diameter	17,0 mm
ID - input diameter	9,2 mm
T - wire thickness (with isolation)	1,1 mm
W - wire width (with isolation)	4,1 mm
a - soldered leadout	2 mm
b - unsoldered leadout	5 mm

Index	Number of turns	Length H ±20%	Inductance (f=500kHz) ±10%	I_max.	R_DC ±20%
CPH4x2,5	2,5	3,7 mm	80 nH	40 A	0,4 mΩ
CPH4x3,5	3,5	5,0 mm	130 nH	40 A	0,56 mΩ
CPH4x4,5	4,5	6,1 mm	190 nH	40 A	0,74 mΩ
CPH4x5,5	5,5	7,4 mm	240 nH	40 A	0,95 mΩ
CPH4x6,5	6,5	8,5 mm	310 nH	40 A	1,13 mΩ
CPH4x7,5	7,5	9,8 mm	370 nH	40 A	1,32 mΩ
CPH4x8,5	8,5	10,4 mm	450 nH	40 A	1,52 mΩ
CPH4x9,5	9,5	11,7 mm	520 nH	40 A	1,71 mΩ
CPH4x10,5	10,5	12,9 mm	600 nH	40 A	1,95 mΩ
CPH4x11,5	11,5	14,0 mm	660 nH	40 A	2,13 mΩ
CPH4x12,5	12,5	15,5 mm	730 nH	40 A	2,36 mΩ
CPH4x13,5	13,5	16,7 mm	800 nH	40 A	2,53 mΩ
CPH4x14,5	14,5	17,4 mm	880 nH	40 A	2,77 mΩ
CPH4x15,5	15,5	18,6 mm	960 nH	40 A	3,0 mΩ
CPH4x16,5	16,5	19,6 mm	1040 nH	40 A	3,2 mΩ

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Helical coils

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