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. 840-7702
Mfr. Part No.FS-1E-3209-10
BrandBlock
$5.55
Each
units
E 32 Transformers, Reactors 32 x 9.5 x 16.4mm 2300nH N87 16.4mm 32mm 9.5mm +210°C - - - - -
RS Stock No. 172-4828
Mfr. Part No.FS-1E-3209-10
BrandBlock
$3.643
Each (In a Box of 80)
units
E 32 Reactors, Transformers 32 x 9.5 x 16.4mm 2300nH N87 16.4mm 32mm 9.5mm +210°C - - - - -
RS Stock No. 840-7608
Mfr. Part No.FS-1E-2507-05
BrandBlock
$2.80
Each
units
E 25 Transformers, Reactors 25 x 7.5 x 12.8mm 1850nH N87 12.8mm 25mm 7.5mm +210°C - - - - -
RS Stock No. 170-7540
Mfr. Part No.FS-1ETD-4415-10
BrandBlock
$7.339
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. 172-4824
Mfr. Part No.FS-1E-2507-05
BrandBlock
$3.35
Each (In a Box of 204)
units
E 25 Reactors, Transformers 25 x 7.5 x 12.8mm 1850nH N87 12.8mm 25mm 7.5mm +210°C - - - - -
RS Stock No. 840-7673
Mfr. Part No.FS-1ETD-4415-10
BrandBlock
$8.17
Each
units
ETD 44 Choke Converter Topologies, Transmitter 44 x 15 x 22mm 3500nH N87 22mm 44mm 15mm - - - - - -
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. 170-7513
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. 840-7159
Mfr. Part No.FS-1E-4215-00
BrandBlock
$3.56
Each
units
E 42 Transformers, Reactors 42 x 15.2 x 21.2mm 3950nH N87 21.2mm 42mm 15.2mm +210°C - - - - -
RS Stock No. 170-7464
Mfr. Part No.FS-1E-4215-00
BrandBlock
$5.512
Each (In a Box of 10)
units
E 42 Reactors, Transformers 42 x 15.2 x 21.2mm 3950nH N87 21.2mm 42mm 15.2mm +210°C - - - - -
RS Stock No. 840-7474
Mfr. Part No.FS-1E-6527-01
BrandBlock
$25.21
Each
units
E 65 Transformers, Reactors 65 x 27.4 x 32.8mm 7900nH N87 32.8mm 65mm 27.4mm +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. 170-7470
Mfr. Part No.FS-1ETD-4415-00
BrandBlock
$6.694
Each (In a Box of 10)
units
ETD 44 Choke Converter Topologies, Transmitter 44 x 15 x 22mm 3500nH N87 22mm 44mm 15mm - - - - - -
RS Stock No. 840-7134
Mfr. Part No.FS-1E-2006-00
BrandBlock
$2.27
Each
units
E 20 Transformers, Reactors 20.4 x 5.9 x 10.1mm 1470nH N87 10.1mm 20.4mm 5.9mm +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. 172-4790
Mfr. Part No.FS-1E-2006-00
BrandBlock
$2.419
Each (In a Box of 10)
units
E 20 Reactors, Transformers 20.4 x 5.9 x 10.1mm 1470nH N87 10.1mm 20.4mm 5.9mm +210°C - - - - -
RS Stock No. 840-7197
Mfr. Part No.FS-1ETD-4415-00
BrandBlock
$7.09
Each
units
ETD 44 Choke Converter Topologies, Transmitter 44 x 15 x 22mm 3500nH N87 22mm 44mm 15mm - - - - - -
RS Stock No. 840-7632
Mfr. Part No.FS-1E-5521-05
BrandBlock
$16.59
Each
units
E 55 Transformers, Reactors 55 x 21 x 27.8mm 6400nH N87 27.8mm 55mm 21mm +210°C - - - - -
RS Stock No. 840-7667
Mfr. Part No.FS-1ETD-2910-10
BrandBlock
$3.47
Each
units
ETD 29 Choke Converter Topologies, Transmitter 29 x 10 x 16mm - N87 16mm 29mm 10mm - - - - - -
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 - - - - -