Can’t find what you’re looking for?
Use the advanced search below.

Advanced Part Finder »

| Privacy Policy | Sitemap

Can’t find what you’re looking for?
Use the advanced search below.

Advanced Part Number Finder »

Kool Mµ® Cores

Affordable FeSiAl Material for Low Losses at Elevated Frequencies


Kool Mµ material’s low loss and relatively high saturation level (10,500 gauss) make it excellent for use in power factor correction circuits (PFC) as well as unidirectional drive applications such as Pulse Transformers and Flyback Transformers. The near zero magnetostriction makes Kool Mµ (sendust) ideal for eliminating audible frequency noise in In-Line Noise Filters and Inductors. View PFC Boost design example using Kool Mu.

Learn More  Request a Quote

Key Characteristics

  • Composition: Al • Si • Fe
  • Shapes: Toroid, E, U, EQ, LP, EER, Block, Cylinder
  • Sizes: 4 mm to 165 mm
  • Permeability: 14µ, 19µ, 26µ, 40µ, 60µ, 75µ, 90µ, 125µ
  • Coating Color: Black 
     

Property Curves

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

Kool Mµ 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
14µ 19µ 26µ 40µ 60µ 75µ 90µ 125µ
140         13 16 19 26 8.06 1.30 10.5 4.19 1.27 2.16
150         17 21 25 35 9.42 2.11 19.9 4.58 1.72 3.18
180         20 25 30 42 10.6 2.85 30.3 5.29 1.85 3.18
020 6 8 10 18 24 30 36 50 13.6 4.7 64 6.99 2.29 3.43
240 6 8 11 17 26 32 39 54 13.6 4.76 64.9 7.24 2.15 3.18
270 12 16 21 33 50 62 74 103 13.6 9.2 125 7.24 2.16 5.41
410 8 11 14 22 33 41 50 70 16.5 7.25 120 7.49 3.45 5.72
030 6 8 11 17 25 31 37 52 17.9 5.99 107 8.51 3.45 3.81
280 6 8 11 17 25 32 38 53 21.8 7.52 164 10.29 4.27 3.81
290 7 10 14 22 32 41 48 66 21.8 9.45 206 10.29 4.27 4.60
040 7 10 14 21 32 40 48 66 23 9.57 220 10.80 4.57 4.60
130 6 8 11 17 26 32 38 53 26.9 9.06 244 11.81 5.84 4.60
050 6 9 12 18 27 34 40 56 31.2 10.9 340 13.46 6.99 5.51
120 8 11 15 24 35 43 52 72 41.2 19.2 791 17.27 9.53 7.11
380 10 14 19 28 43 53 64 89 41.4 23.2 960 18.03 9.02 7.11
206 7 10 14 21 32 41 49 68 50.9 22.1 1,120 21.08 12.07 7.11
310 9 14 19 29 43 54 65 90 56.7 31.7 1,800 23.62 13.34 8.38
350 12 16 22 34 51 62 76 105 58.8 38.8 2,280 24.33 13.77 9.65
930 18 23 32 50 75 94 113 157 63.5 65.4 4,150 27.69 14.10 11.94
426     30   69   104 144 66.5 72.7 4,840 30.00 17.40 10.90
548 14 20 28 41 61 76 91 127 81.4 65.6 5,340 33.66 19.46 11.43
585 9 12 16 25 38 47 57 79 89.5 46.6 4,150 35.18 22.56 9.78
324 13 18 24 37 56 70 84 117 89.8 67.8 6,090 36.70 21.54 11.35
395 28 39 53 81 122 153 183 254 95.1 153.7 14,617 40.94 21.27 17.89
254 19 26 35 54 81 101 121 168 98.4 107 10,600 40.77 23.32 15.37
395 28 39 53 81 122 153 183 254 94.0 153 14,600 40.94 21.27 17.89
454 25 34 47 72 108 135 161 224 102 147.5 15,100 43.84 23.39 17.27
089 20 27 37 57 86 107 128 178 116 134 15,600 47.63 27.89 16.13
438 32 43 59 90 135 169 202 281 107 199 21,400 47.63 23.32 18.92
725 41 56 76 117 175 219 269 366 114 262 29,700 51.51 24.00 21.59
715 17 23 32 49 73 91 109 152 127 125 15,900 51.69 30.94 14.35
540 24 33 45 69 104 130 156 217 126 174 22,000 54.90 28.10 15.30
109 18 24 33 50 75 94 112 156 143 144 20,700 58.04 34.75 14.86
195 32 44 60 92 138 172 207 287 125 229 28,600 58.04 25.58 16.13
596 29 39 54 83 125 156 187 259 143 237 33,900 60.60 33.00 20.50
620 44 60 82 126 189 237 284 394 144 360 51,800 63.09 31.70 25.91
070 35 48 65 100 143 187 225 312 158 314 49,700 69.42 34.67 21.41
778 47 64 88 135 205 256 306 425 177.2 492 81,500 78.94 38.33 26.85
740 48 64 88 136 204 255 306 425 184 497 91,400 75.21 44.40 35.92
866 16 22 30 45 68 85 102 142 196 176 34,500 78.94 48.21 13.84
906 20 27 37 57 85 106 128 177 196 221 43,400 78.94 48.21 17.02
102 26 35 48 74 111 139 167 232 243 358 86,900 103.00 55.75 17.91
337 37 50 68 105 158       324 678 220,000 133.96 77.19 26.80
165 42 57 78           412 987 407,000 166.50 101.02 33.15
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
14µ 26µ 40µ 60µ 90µ
1808   26 35 48 69 40.1 22.8 914 19.6 7.9 4.93
2510   39 52 70 100 48.5 38.5 1,867 25.8 9.4 6.45
3007   33  46 71  92  65.6 60.1 3,943 30.6 14.8 7.21
3515   56 75 102 146 69.4 84 5,830 35.1 14.0 9.53
4017   56 76 105 151 98.4 128 12,595 43.5 20.8 11.0
4020   80 108 150 217 98.4 183 18,007 43.5 20.8 15.7
4022   104 140 194 281 98.4 237 23,321 43.5 20.8 20.3
4317   88 119 163 234 77.5 152 11,800 41.5 16.2 12.7
5528   116 157 219 322 123 350 43,100 55.7 27.2 21.0
5530   138 187 261 338 123 417 51,400 55.7 27.2 25.0
6527 103 162 230 300   147 540 79,400 66.4 32.1 27.4
7228   130 173 235   137 368 50,400 73.5 27.4 19.4
8020 75 103 145  190   185 389 72,000 81.2 37.5 20.2
8024   200 275 370   131.4 600 78,800 81.2 23.4 30.1
8044   91 113 170   208 389 80,900 81.2 44.0 20.2
114LE 161 235   445   215  1220 262,000 115.1 45.8 35.3
130LE   254       219 1080 237,000 134.1 32.2 55.1
160LE   180       273 778 212,000 162.5 37.5 40.9
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 90µ
3112 61 92 111 179 65.6 101 6,620 31.8 10.9 12.5
4110 42 56 78 109 85.2 80 6,816 41.2 10.7 9.9
4111 52 72 95 138 85.2 101 8,605 41.2 10.9 12.5
4119 79 110 151 218 85.2 160 13,632 41.2 10.9 19.5
5527 67 94 120   168 172 28,896 55.5 27.1 16.7
5529 85 121 160   168 244 40,992 55.5 27.1 23.6
6527 89 111 165   219 270 59,130 66.6 32.2 27.4
6533 82 109 143   199 250 49,750 66.6 32.2 20.4
7236 87 114 149   219 290 63,510 73.3 34.9 21.3
8020 64 77 95   273 195 53,235 81 37.5 20.2
8038 97 124 179   237 354 83,898 81 37.5 23.4
Core Data AL nH/T2 (nominal) Le Path Length
mm		 Ae Cross Section
mm2		 Length
mm		 Height
mm		 Width
mm
26µ 40µ 60µ 75µ
EQK20 L050 81 120 167 203 29.3 60.8 20.0 5.0 14.0
EQK20 L061 67 98 138 166 35.8 60.8 20.0 6.1 14.0
EQK26 L070 111 164 228   42.3 119.8 26.5 7.0 19.0
EQK26 L088 95 140 195   49.5 119.8 26.5 8.8 19.0
EQK26 L101 86 127 177   54.7 119.8 26.5 10.1 19.0
EQK26 L124 74 108 151   63.9 119.8 26.5 12.4 19.0
EQK32 L101 100 148 207   59.5 152.3 32.0 10.1 22.0
EQK32 L152 75 110 156   79.9 152.3 32.0 15.2 22.0
EQK32 L180 66 97 136   91.1 152.3 32.0 18.0 22.0
EQK36 L100 109 160 223 272 65.1 180.8 36.0 10.0 26.0
EQK36 L110 102 151 211 256 69.1 180.8 36.0 11.0 26.0
EQK36 L174 75 110 154 187 94.7 180.8 36.0 17.4 26.0
EQK41 L120 94 138 193 234 83.6 199.7 41.5 12.0 28.0
EQK41 L199 68 100 140 163 115.2 199.7 41.5 19.9 28.0
EQK50 L200 109 160 223 271 113.4 314.1 50.0 20.0 32.0
EQK50 L250 92 136 190 231 133.4 314.1 50.0 25.0 32.0
Core Data AL nH/T2 (nominal) Le Path Length
mm		 Ae Cross Section
mm2		 Length
mm		 Height
mm		 Width
mm
26µ 40µ 60µ 75µ
LPK23 L087 54 79 110 134 49.1 67.0 23.4 8.7 14.0
LPK25 L099 68 100 139   55.7 96.0 25.0 9.9 18.0
LPK30 L118 65 96 134   68.0 114.0 30.0 11.8 20.0
LPK32 L152 69 101 141   82.1 143.0 32.0 15.2 22.0
LPK36 L144 86 127 177   80.6 177.0 36.2 14.4 24.0
LPK42 L107 116 171 239 290 69.7 206.0 42.0 10.7 25.0
LPK42 L123 106 156 218 265 76.1 206.0 42.0 12.3 25.0
LPK42 L158 90 132 184 224 90.1 206.0 42.0 15.8 25.0
Core Data AL nH/T2 (nominal) Le Path Length
mm		 Ae Cross Section
mm2		 Ve Volume
mm3		 Length
mm

Height
mm

 Width
mm
26µ 40µ 60µ
ERK25 L110 34 47 65 57.8 45.0 2,600 25.5 11.0 7.5
ERK40 L224 59 81 111 111.3 149.1 16,600 40.0 22.4 13.3
Block
Core Data		 AL nH/T2 (nominal) Ve Volume
mm3		 Length
mm		 Width
mm		 Height
mm

Radius
mm
26µ 40µ 60µ
4741 PDF   PDF 53,600 47.5 41.0 27.5 N/A
5030   PDF  PDF  PDF  23,000  50.5 30.3 15.0 N/A
5241 PDF   PDF 58,700 52.0 41.0 27.5 N/A
5528 PDF PDF PDF 31,200 54.9 27.6 20.6 N/A
6020       56,600 60.5 20.3 20.0 N/A
6030 PDF   PDF 27,000 60.0 30.0 15.0 N/A
6131       36,700 60.5 30.3 20.0 N/A
7020 PDF PDF PDF 28,600 70.5 20.3 20.0 N/A
7030  PDF   PDF 42,800 70.5 30.3 20.0 N/A
8020 PDF PDF PDF 32,700 80.5 20.3 20.0 N/A
8030 PDF PDF  PDF   48,800 80.5 30.3 20.0 N/A
9030       54,843 90.5 30.3 20.0 N/A
9541   PDF   PDF  PDF  107,200  95.0 41.0 27.5 N/A
Round Block
Core Data		                
3515       12,175 35.3 15.2 25.0 7.5
6034 PDF   PDF 17,900 60.0 34.0 10.0 17.0
6524       27,000 64.5 24.2 18.8 12.0
7528       40,900 74.5 27.5 21.7 13.75
7543     PDF 43,800 75.0 43.0 15.5 21.5
8030       44,700 80.5 30.2 23.5 15.0
8430       53,500 84.0 30.0 23.0 15.0
9040       48,850 90.0 40.0 15.0 20.0
Core Data Permeability   Width
mm		 Height
mm
26µ 40µ 45µ 60µ 75µ 90µ
00K011020CXXX X X   X   X 11.4 20.0
00K015010CXXX X X   X   X 15.0 10.5
00K015012CXXX X X X X   X 15.0 12.0
00K015018CXXX X X   X   X 15.0 18.0
00K015020CXXX X X   X   X 15.0 20.0
00K015022CXXX X X   X   X 15.0 22.0
00K020010CXXX X X   X   X 20.32 10.0
00K021020CXXX X X   X   X 21.0 20.0
00K024020CXXX X X   X   X 24.0 20.0
00K028020CXXX X X   X   X 27.6 20.0
00K028022CXXX X X   X X X 27.6 21.5
00K028024CXXX   X         27.6 24.0
00K030018CXXX X X   X X X 30.0 18.0
00K030020CXXX X X   X   X 30.0 20.0
00K030027CXXX X X   X X X 30.0 27.5
00K030030CXXX   X         30.0 30.0
00K033020CXXX X X   X   X 33.0 20.0
00K033022CXXX X X   X X X 33.0 21.5
00K042020CXXX X X   X   X 42.0 20.0
00K042030CXXX X           42.0 30.0
00K047020CXXX X X   X   X 46.74 20.0
00K051020CXXX X X   X   X 50.55 20.0
00K057015CXXX X X   X   X 57.15 15.0
00K074020CXXX X X   X   X 74.1 20.0
00K074025CXXX X X   X   X 74.0 25.0
00K078030CXXX X           77.8 30.0