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efd cores

dimensions

row
#

part number

generic size

a

b

c

d

e

f

k

wt. (g) per set

(1)

8978101021
8998101021
8995101021

efd10

10.50 ± 0.3
0.413

5.20±0.15
0.205

2.70±0.2
0.106

3.75±0.15
0.148

7.65±0.3
0.301

4.55±0.2
0.179

1.45±0.1
0.057

0.90

(2)

8978121221
8998121221
8995121221

efd12

12.50±0.35
0.492

6.20±0.15
0.244

3.50 ± 0.2
0.138

4.55±0.15
0.179

9.00±0.35
0.354

5.40 ± 0.2
0.213

2.00 ± 0.1
0.079

1.80

(3)

8978151521
8998151521
8995151521

efd15

15.00 ± 0.4
0.591

7.50 ± 0.15
0.295

4.65 ± 0.2
0.183

5.50±0.15
0.217

11.00±0.4
0.433

5.30 ± 0.2
0.209

2.40 ± 0.1
0.094

2.80

(4)

8978202021
8998202021
8995202021

efd20

20.00±0.55
0.787

10.00±0.25
0.394

6.65 ± 0.2
0.262

7.70±0.25
0.303

15.40 ± 0.5
0.606

8.90 ± 0.3
0.350

3.60 ± 0.15
0.142

7.00

(5)

8978252521
8998252521
8995252521

efd25

25.00±0.5
0.984

12.50±0.25
0.492

9.10±0.3
0.358

9.30±0.25
0.366

18.70 ± 0.6
0.736

11.40 ± 0.2
0.449

5.20 ± 0.2
0.205

16.00

(6)

8978303021
8998303021
8995303021

efd30

30.00±0.8
1.181

15.00±0.25
0.591

9.10±0.3
0.358

11.20±0.3
0.441

22.40±0.75
0.882

14.60±0.3
0.575

4.90 ± 0.2
0.193

24.00



table continued ...

magnetic core parameters


row
#

part number

l/a(cm-1)

le(cm)

ae(cm2)

ve(cm3)

a min(cm2)

al(nh)

(1)

8978101021

8998101021
8995101021

32.70

2.36

0.072

0.171

0.066

530 ±25%

540 ±25%
610 ±25%

(2)

8978121221

8998121221
8995121221

25.90

2.84

0.11

0.311

0.108

710 ±25%

730 ±25%
850 ±25%

(3)

8978151521

8998151521
8995151521

22.30

3.44

0.154

0.531

0.127

880 ±25%

910 ±25%
1050 ±25%

(4)

8978202021

8998202021
8995202021

15.60

4.74

0.31

1.44

0.29

1200 ±25%

1200 ±25%
1400 ±25%

(5)

8978252521

8998252521
8995252521

10.40

5.88

0.58

3.32

0.55

2200 ±25%

2250 ±25%
2650 ±25%

(6)

8978303021

8998303021
8995303021

11.30

6.93

0.69

4.26

0.66

2800 ±25%

2150 ±25%
2800 ±25%



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