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Customized Kool Mu Core
Physical Dimensions 
ODBare Core Nominal34.29 mm1.350 in
Coated Core (max)35.1 mm1.382 in
IDBare Core Nominal23.37 mm0.920 in
Coated Core (min)22.56 mm0.888 in
HtBare Core Nominal8.89 mm0.350 in
Coated Core (max)9.83 mm0.387 in
Magnetic Dimensions 
AeEffective Magnetic Cross Section 0.454 cm²
LeEffective Magnetic Path Length 8.95 cm
VeEffective Core Volume 4.06 cm³
WAMinimum Effective Window Area 4.00 cm²
SASurface Area 41.4 cm²
MLTMean Length Per Turn 4.35 cm
Reference Perm.AL Value (nH/N²)AS SendustAF Fe-SiAPH Super  SendustAH High Flux
125µ79AS343125AF343125 AH343125
147µ93AS343147  AH343147
Approx. Unit Weight:23 g28 g23 g28 g
Test Conditions
WindingN=90, #22 AWG
Frequency10 kHz
Voltage0.18 V
AL Tolerance±8%
Magnet Wire Winging Data
Wire SizeAWG810121416182022242628
Single LayerTurns1621273443546885107134167
Rdc(Ω)1.4 m3.0 m6.1 m12.2m24.6m49.1 m98.4 m195.6m391.5m779.8m1.5
Full WindingTurns213250781201862884456891,0661,651
Rdc(Ω)1.9 m4.5 m11.3m28.1m68.6m169.2m416.6m1.
Coating/Packaging Information 
Coating TypeBlack Epoxy
Voltage Breakdown2000 Vrms
Limit0.1 mA, 5 s
Package Quantity441 Pcs/Box
G&M is able to customize the design to meet customers’ requirements.
Sendust Cores(AS):
Sendust Core is made from 6%Al,9%Si and 85%Fe. It is mainly used to replace iron powder core as its core loss is 80% less than the powdered iron, so it can be applied with the frequency above 8kHz. Sendust core has a saturation flux density of 1.05T and permeability from 14 to 250 . The nearly zero magnetostriction alloy makes sendust ideal for eliminating audible frequency noise. It is mainly applied in AC inductor, output inductor, in-line filter, power factor correction inductor etc. It can also be used as transformer core in some circumstances.
Percent Initial Permeability vs.DC Magnetizing Force
Percent Initial Permeability vs.Peak AC Flux Density
Initial Permeability vs.Frequency
Permeability vs. Temperature
Sendust (AS) Core Loss
Typical Applications:
Workshop and equipment:
Corporate honor:Customized Kool Mu Core

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