Transformer Ferrite 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 transformer to operate at very high frequencies. The devices can handle a great deal of power without huge increases in the size of the device.

Types of transformer ferrite cores

Different transformer ferrite cores are intended to be used with specific kinds of equipment. These include broadband transformers, DC/DC converters, flat transformers, power transformers, reactors, switch mode power supply (SMPS ) transformers, and transmitters.

In addition to length, depth, and width, transformer ferrite cores also vary in their minimum and maximum operating temperatures. It is important to consider the operating temperature of the equipment that the core will be used in when choosing between cores. For instance, between one with a maximum temperature of +125°Cand another with one of +210°C.


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Description Price Accessory Type For Use With Dimensions AL Rating Material Depth Length Width Maximum Temperature Series Input Voltage Range Maximum Operating Temperature Minimum Operating Temperature Standards Met
RS Stock No. 170-7540
Mfr. Part No.FS-1ETD-4415-10
BrandBlock
$5.28
Each (In a Box of 80)
units
ETD 44 Choke Converter Topologies, Transmitter 44 x 15 x 22mm 3500nH N87 22mm 44mm 15mm - - - - - -
RS Stock No. 840-7673
Mfr. Part No.FS-1ETD-4415-10
BrandBlock
$6.10
Each
units
ETD 44 Choke Converter Topologies, Transmitter 44 x 15 x 22mm 3500nH N87 22mm 44mm 15mm - - - - - -
RS Stock No. 170-7513
Mfr. Part No.FS-1ETD-4916-02
BrandBlock
$9.375
Each (In a Box of 60)
units
ETD 49 Choke Converter Topologies, Transmitter 49 x 16 x 25mm 3800nH N87 25mm 49mm 16mm - - - - - -
RS Stock No. 840-7507
Mfr. Part No.FS-1ETD-4916-02
BrandBlock
$11.98
Each
units
ETD 49 Choke Converter Topologies, Transmitter 49 x 16 x 25mm 3800nH N87 25mm 49mm 16mm - - - - - -
RS Stock No. 170-7530
Mfr. Part No.FS-1E-5521-05
BrandBlock
$14.893
Each (In a Box of 50)
units
E 55 Reactors, Transformers 55 x 21 x 27.8mm 6400nH N87 27.8mm 55mm 21mm +210°C - - - - -
RS Stock No. 170-7466
Mfr. Part No.FS-1E-6527-00
BrandBlock
$18.281
Each (In a Box of 10)
units
E 65 Reactors, Transformers 65 x 27.4 x 32.8mm 7900nH N87 32.8mm 65mm 27.4mm +210°C - - - - -
RS Stock No. 840-7597
Mfr. Part No.FS-1ETD-5922-05
BrandBlock
$19.17
Each
units
ETD 59 Choke Converter Topologies, Transmitter 59 x 22 x 31mm 5300nH N87 31mm 59mm 22mm - - - - - -
RS Stock No. 170-7527
Mfr. Part No.FS-1ETD-5922-05
BrandBlock
$18.112
Each (In a Box of 18)
units
ETD 59 Choke Converter Topologies, Transmitter 59 x 22 x 31mm 5300nH N87 31mm 59mm 22mm - - - - - -
RS Stock No. 840-7474
Mfr. Part No.FS-1E-6527-01
BrandBlock
$17.07
Each
units
E 65 Reactors, Transformers 65 x 27.4 x 32.8mm 7900nH N87 32.8mm 65mm 27.4mm +210°C - - - - -
RS Stock No. 840-7632
Mfr. Part No.FS-1E-5521-05
BrandBlock
$12.36
Each
units
E 55 Reactors, Transformers 55 x 21 x 27.8mm 6400nH N87 27.8mm 55mm 21mm +210°C - - - - -
RS Stock No. 170-7506
Mfr. Part No.FS-1E-6527-01
BrandBlock
$22.219
Each (In a Box of 24)
units
E 65 Reactors, Transformers 65 x 27.4 x 32.8mm 7900nH N87 32.8mm 65mm 27.4mm +210°C - - - - -
RS Stock No. 840-7169
Mfr. Part No.FS-1E-6527-00
BrandBlock
$14.43
Each
units
E 65 Reactors, Transformers 65 x 27.4 x 32.8mm 7900nH N87 32.8mm 65mm 27.4mm +210°C - - - - -
RS Stock No. 170-7460
Mfr. Part No.FS-1E-2507-00
BrandBlock
$3.094
Each (In a Box of 10)
units
E 25 Reactors, Transformers 25 x 7.5 x 12.8mm 1850nH N87 12.8mm 25mm 7.5mm +210°C - - - - -
RS Stock No. 840-7733
Mfr. Part No.FS-1EFD-2007-10
BrandBlock
$2.16
Each
units
EFD 20 Choke Converter Topologies, Transmitter 20 x 7 x 10mm 1200nH N87 10mm 20mm 7mm - - - - - -
RS Stock No. 840-7601
Mfr. Part No.FS-1E-1605-05
BrandBlock
$2.55
Each
units
E 16 Reactors, Transformers 16 x 4.7 x 8.2mm 1000nH N87 8.2mm 16mm 4.7mm +210°C - - - - -
RS Stock No. 172-4784
Mfr. Part No.FS-1EFD-2007-10
BrandBlock
$1.75
Each (In a Box of 252)
units
EFD 20 Choke Converter Topologies, Transmitter 20 x 7 x 10mm 1200nH N87 10mm 20mm 7mm - - - - - -
RS Stock No. 170-7546
Mfr. Part No.FS-1E-4220-10
BrandBlock
$7.144
Each (In a Box of 34)
units
E 42 Reactors, Transformers 42 x 20 x 21.2mm 5200nH N87 21.2mm 42mm 20mm +210°C - - - - -
RS Stock No. 840-7651
Mfr. Part No.FS-1EFD-2007-05
BrandBlock
$2.16
Each
units
EFD 20 Choke Converter Topologies, Transmitter 20 x 7 x 10mm 1200nH N87 10mm 20mm 7mm - - - - - -
RS Stock No. 840-7660
Mfr. Part No.FS-1ETD-3411-10
BrandBlock
$4.21
Each
units
ETD 34 Choke Converter Topologies, Transmitter 34 x 11 x 17mm 2600nH N87 17mm 34mm 11mm - - - - - -
RS Stock No. 840-7503
Mfr. Part No.FS-1ETD-4415-02
BrandBlock
$8.71
Each
units
ETD 44 Choke Converter Topologies, Transmitter 44 x 15 x 22mm 3500nH N87 22mm 44mm 15mm - - - - - -