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Transformer Cores

Some transformers feature ferrite cores, which act as a means to transfer magnetic flux within the transformer. While less common than laminated iron cores, ferrite cores allow for superior performance.

How transformer ferrite cores work

These devices are commonly parts of switched-mode power supplies. The ferrite in the core is in powdered form, which allows the transform...

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EPCOS N87 ER 9.5/5 Transformer Ferrite Core, 800nH, For Use With Power Transformers
RS Stock No. 125-3331
Brand EPCOS
Manufacturers Part No. B65523J0000R087

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Epcos
ER 9.5/5
Power Transformers
9.5 x 5 x 5mm
800nH
N87
5mm
9.5mm
5mm
-
IEC 62317-9
EPCOS N87 E 20/10/6 Transformer Ferrite Core, 171nH, For Use With Power Transformers
RS Stock No. 125-3652
Brand EPCOS
Manufacturers Part No. B66311G0250X187

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Epcos
E 20/10/6
Power Transformers
20.4 x 5.9 x 10.1mm
171nH
N87
10.1mm
20.4mm
5.9mm
-
IEC 61246
EPCOS E 13/7/4 Transformer Ferrite Core, 800nH, For Use With Miniature Transformers, Power Transformers
RS Stock No. 125-3640
Brand EPCOS
Manufacturers Part No. B66305G0000X127

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Epcos
E 13/7/4
Miniature Transformers, Power Transformers
12.6 x 3.7 x 6.5mm
800nH
N27
6.5mm
12.6mm
3.7mm
-
IEC 61246
EPCOS N87 EFD 15/8/5 Transformer Ferrite Core, 100nH, For Use With DC/DC Converter, Flat Transformers, Power
RS Stock No. 125-3689
Brand EPCOS
Manufacturers Part No. B66413U0100K187

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Epcos
EFD 15/8/5
DC/DC Converter, Flat Transformers, Power Transformers
15 x 4.85 x 7.5mm
100nH
N87
7.5mm
15mm
4.85mm
-
IEC 61185
EPCOS N87 E 30/15/7 Transformer Ferrite Core, 1900nH, For Use With Power Transformers
RS Stock No. 125-3658
Brand EPCOS
Manufacturers Part No. B66319G0000X187

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Epcos
E 30/15/7
Power Transformers
30 x 7.3 x 15.2mm
1900nH
N87
15.2mm
30mm
7.3mm
-
-
EPCOS T38 RM 6 Transformer Ferrite Core, 8600nH, For Use With Broadband Transformers
RS Stock No. 125-3378
Brand EPCOS
Manufacturers Part No. B65807J0000Y038

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Epcos
RM 6
Broadband Transformers
17.9 x 14.7 x 12.5mm
8600nH
T38
12.5mm
17.9mm
14.7mm
-
IEC 62317-4
EPCOS N87 ELP 32/6/20 Transformer Ferrite Core, 5700nH, For Use With Power Transformers
RS Stock No. 125-3629
Brand EPCOS
Manufacturers Part No. B66287G0000X187

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Epcos
ELP 32/6/20
Power Transformers
31.75 x 20.35 x 6.35mm
5700nH
N87
6.35mm
31.75mm
20.35mm
ELP
IEC 62317-9
EPCOS N30 P 18/11 Transformer Ferrite Core, 5900nH, For Use With Broadband Transformers
RS Stock No. 125-3350
Brand EPCOS
Manufacturers Part No. B65651W0000R030

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Epcos
P 18/11
Broadband Transformers
-
5900nH
N30
10.6mm
-
18.4mm
-
IEC 60133
EPCOS E 25/13/7 Transformer Ferrite Core, 1750nH, For Use With Power Transformers
RS Stock No. 125-3653
Brand EPCOS
Manufacturers Part No. B66317G0000X127

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Epcos
E 25/13/7
Power Transformers
25 x 7.5 x 12.8mm
1750nH
N27
12.8mm
25mm
7.5mm
-
IEC 61246
EPCOS N87 EFD 25 Transformer Ferrite Core, 2000nH, For Use With DC DC converter
Also available in industry standard packaging
RS Stock No. 483-3618
Brand EPCOS
Manufacturers Part No. B66421G0000X187

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Epcos
EFD 25
DC DC converter
25 x 12.5 x 9.1mm
2000nH
N87
9.1mm
25mm
12.5mm
-
-
EPCOS N87 E 13/7/4 Transformer Ferrite Core, 850nH, For Use With Miniature Transformers, Power Transformers
RS Stock No. 125-3641
Brand EPCOS
Manufacturers Part No. B66305G0000X187

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Epcos
E 13/7/4
Miniature Transformers, Power Transformers
12.6 x 3.7 x 6.5mm
850nH
N87
6.5mm
12.6mm
3.7mm
-
IEC 61246
EPCOS N87 ETD 39/20/13 Transformer Ferrite Core, 2700nH, For Use With Power Transformers, SMPS Transformers
RS Stock No. 125-3673
Brand EPCOS
Manufacturers Part No. B66363G0000X187

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Epcos
ETD 39/20/13
Power Transformers, SMPS Transformers
38.9 x 12.8 x 20mm
2700nH
N87
20mm
38.9mm
12.8mm
-
IEC 61185
EPCOS N87 EFD 30 Transformer Ferrite Core, 160nH, For Use With DC DC converter
Also available in industry standard packaging
RS Stock No. 647-9610
Brand EPCOS
Manufacturers Part No. B66423U0160K187

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Epcos
EFD 30
DC DC converter
30 x 15 x 9.1mm
160nH
N87
9.1mm
30mm
15mm
-
-
EPCOS N87 ELP Transformer Ferrite Core, 2600nH, For Use With Power Transformers
RS Stock No. 125-3625
Brand EPCOS
Manufacturers Part No. B66283G0000X187

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Epcos
ELP
Power Transformers
18 x 10 x 4mm
2600nH
N87
4mm
18mm
10mm
ELP
IEC 62317-9
EPCOS N87 EP 20 Transformer Ferrite Core, 4000nH, For Use With Power Transformers
RS Stock No. 125-3416
Brand EPCOS
Manufacturers Part No. B65847A0000R087

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Epcos
EP 20
Power Transformers
24.5 x 15.3 x 21.6mm
4000nH
N87
21.6mm
24.5mm
15.3mm
-
IEC 61596
EPCOS N97 EFD 25/13/9 Transformer Ferrite Core, 2100nH, For Use With DC/DC Converter, Flat Transformers, Power
RS Stock No. 125-3696
Brand EPCOS
Manufacturers Part No. B66421G0000X197

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Epcos
EFD 25/13/9
DC/DC Converter, Flat Transformers, Power Transformers
25 x 9.1 x 12.5mm
2100nH
N97
12.5mm
25mm
9.1mm
-
-
EPCOS N87 E 25/13/7 Transformer Ferrite Core, 1850nH, For Use With Power Transformers
RS Stock No. 125-3654
Brand EPCOS
Manufacturers Part No. B66317G0000X187

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Epcos
E 25/13/7
Power Transformers
25 x 7.5 x 12.8mm
1850nH
N87
12.8mm
25mm
7.5mm
-
IEC 61246
EPCOS N87 RM 5 Transformer Ferrite Core, 2000nH, For Use With Power Transformers
RS Stock No. 125-3368
Brand EPCOS
Manufacturers Part No. B65805J0000R087

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Epcos
RM 5
Power Transformers
14.6 x 12.3 x 10.5mm
2000nH
N87
10.5mm
14.6mm
12.3mm
-
IEC 62317-4
FERROXCUBE GFR Phenolformaldehyde EFD Transformer Ferrite Core, For Use With Ferrites
RS Stock No. 174-1588
Brand FERROXCUBE
Manufacturers Part No. EFD15/8/5-3F3

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FERROXCUBE
EFD
Ferrites
-
-
GFR Phenolformaldehyde
-
-
-
-
-
EPCOS N87 EFD 15/8/5 Transformer Ferrite Core, 780nH, For Use With DC/DC Converter, Flat Transformers, Power
RS Stock No. 125-3687
Brand EPCOS
Manufacturers Part No. B66413G0000X187

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Epcos
EFD 15/8/5
DC/DC Converter, Flat Transformers, Power Transformers
15 x 4.85 x 7.5mm
780nH
N87
7.5mm
15mm
4.85mm
-
IEC 61185

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