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Kool Mµ® Ultra Cores

Lowest Losses and Superior DC Bias


New from Magnetics! Kool Mµ® Ultra's ultra low losses approach that of ferrite cores while maintaining powder core advantages of soft saturation, stable high temperature performance, and no gap fringing losses. With DC Bias also superior to standard Kool Mµ and comparable to Kool Mµ Hf, Kool Mµ Ultra is a great choice for datacom and telecom applications.

Key Characteristics

  • Composition: Al • Si • Fe
  • Shapes: Toroid, E, Block
  • Sizes: Up to 133 mm
  • Permeability: 26µ, 40µ, 60µ
  • Coating Color: Black

For more information on Magnetics' new Kool Mµ Ultra toroids, view our technical bulletin.

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Property Curves

View Kool Mµ Ultra Material Property Curves including DC Magnetization, Core Loss Density curves, and Permeability versus DC Bias curves.

Kool Mµ Ultra Part Number Identification

How To Order: Magnetics Powder Cores

Core Data AL nH/T2 (nominal) Le Path Length
mm		 Ae Cross Section
mm2		 Ve Volume
mm3		 OD max
mm		 ID min
mm		 HT max
mm
26µ 40µ 60µ
050 12 18 27 31.2 10.9 340 13.46 6.99 5.51
120 15 24 35 41.2 19.2 791 17.27 9.52 7.11
380 19 28 43 41.4 23.2 960 18.03 9.02 7.11
206 14 21 32 50.9 22.1 1,120 21.08 12.07 7.11
310 19 29 43 56.7 31.7 1,800 23.62 13.34 8.38
350 22 34 51 58.8 38.8 2,280 24.33 13.77 9.65
930 32 50 75 63.5 65.4 4,150 27.69 14.10 11.94
426 30   69 66.5 72.7 4,840 30.00 17.40 10.90
548 28 41 61 81.4 65.6 5,340 33.66 19.46 11.43
585 16 25 38 89.5 46.6 4,150 35.18 22.56 9.78
324 24 37 56 89.8 67.8 6,090 36.70 21.54 11.35
395 53 81 122 95.1 153.7 14,617 40.94 21.27 17.89
254 35 54 81 98.4 107 10,600 40.77 23.32 15.37
454 47 72 108 102 147.5 15,100 43.84 23.39 17.27
089 37 57 86 116 134 15,600 47.63 27.89 16.13
438 59 90 135 107 199 21,300 47.63 23.32 18.92
725 76 117 175 114 262 29,700 51.51 24.00 21.59
715 32 49 73 127 125 15,900 51.69 30.94 14.35
540 45 69 104 126 174 22,000 54.90 28.10 15.30
109 33 50 75 143 144 20,700 58.04 34.75 14.86
195 60 92 138 125 229 28,600 58.04 25.58 16.13
596 54 83 125 143 237 33,900 60.60 33.00 20.50
620 82 126 189 144 360 51,800 63.09 31.70 25.91
070 65 100 143 158 314 49,700 69.42 34.67 21.41
778 88 135 205 177.2 492 81,500 78.94 38.33 26.85
740 88 136 204 184 497 91.400 75.21 44.40 35.92
866 30 45 68 196 176 34,500 78.94 48.21 13.84
906 37 57 85 196 221 43,400 78.94 48.21 17.02
102 48     243 358 86,900 103.00 55.75 17.91
337 68     324 678 220,000 133.96 77.19 26.80
Core Data AL nH/T2 (nominal) Le Path Length
mm		 Ae Cross Section
mm2		 Ve Volume
mm3		 Length max
mm		 Leg Length min
mm		 Height max
mm
26µ 40µ 60µ
4022 104 140   98.4 237 23,321 43.5 20.8 20.3
4317 88 119   77.5 152 11,800 41.5 16.2 12.7
5528 116 157   123 350 43,100 55.7 27.2 21.0
5530 138 187   123 417 51,400 55.7 27.2 25.0
6527 162 230   147 540 79,400 66.4 32.1 27.4
7228 130 173   137 368 50,400 73.5 27.4 19.4
8020 103 145   185 389 72,000 81.2 37.5 20.2
8044 91     208 389 80,900 81.2 44.0 20.2
Block
Core Data		 AL nH/T2 (nominal) Ve Volume
mm3		 Length
mm		 Width
mm		 Height
mm
26µ 40µ 60µ
4741 PDF PDF   53,600 47.5 41.0 27.5
6030 PDF PDF   27,000 60.0 30.0 15.0
9541 PDF PDF   107,200 95.0 41.0 27.5