Round Cable EMI Suppression Cores ZFK 18
Typical Impedance (Ω)
10 MHz					91 Ω
25 MHz+					145 Ω
100 MHz+					235 Ω
250 MHz					275 Ω
Electrical Properties
Kernmaterial					Ferrit Toroid
					NiZn
H(Oe)					0.22
Dim.		mm		mm Toleranz	Nominal inch	Inch misc.
A		25.9		±0.75	1.02	----
B		12.8		±0.25	0.505	----
C		28.6		±0.80	1.125	----
ZFK - Material Characteristics
Property	Unit		Symbol		Value
Initial Permeability @ B < 10 gauss			µi		850
Temp. Coeff. Of initial Permeability	% °C				1.25
Coercive Force	Hc		oersted		0.45
Flux Density @ Field Strength	Gauss Oersted		B     H		2900     10
Loss Factor @ Frequency	10 -6 MHz		Tan δ/ µi		250     1.0
Curie Temperature	°C		Tc		>130
Resistivity	Ohm-cm		P		1×105
Ferrite Material Constants
Specific Heat					0.25 cal/g/°C
Thermal Conductivity					3.5 - 4.5 mW/cm-°C
Coefficient of Linear Expansion					8 - 10x10-6/°C
Tensile Strength					4.9 kgf/mm2
Compressive Strength					42 kgf/mm2
Young's Modulus					15x103 kgf/mm2
Hardness (Knoop)					650
Specific Gravity					≈4.7 g/cm3
The above quoted properties are typical for Fair-Rite MnZn and NiZn ferrites.
Die oben genannten Eigenschaften sind typisch für Fair-Rite MnZn- und NiZn-Ferrite.