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. 167-8334
Mfr. Part No.B66367G0500X187
BrandEPCOS
$2.59
Each (In a Box of 120)
units
ETD 49 SMPS Transformer 48.5 x 16.7 x 24.9mm 525nH N87 24.9mm 48.5mm 16.7mm - - - - - -
RS Stock No. 647-9446
Mfr. Part No.B66367G0500X187
BrandEPCOS
$4.65
Each (In a Pack of 2)
units
ETD 49 SMPS Transformer 48.5 x 16.7 x 24.9mm 525nH N87 24.9mm 48.5mm 16.7mm - - - - - -
RS Stock No. 647-9345
Mfr. Part No.B66387G0000X187
BrandEPCOS
$8.83
Each (In a Pack of 2)
units
E 65 - 65 x 32.8 x 27.4mm 7900nH N87 27.4mm 65mm 32.8mm - - - - - -
RS Stock No. 167-8372
Mfr. Part No.B66387G0000X187
BrandEPCOS
$6.68
Each (In a Box of 36)
units
E 65 - 65 x 32.8 x 27.4mm 7900nH N87 27.4mm 65mm 32.8mm - - - - - -
RS Stock No. 167-8389
Mfr. Part No.B66371G0000X187
BrandEPCOS
$10.99
Each (In a Box of 30)
units
E 70 Transformer 70.5 x 32 x 33.2mm 9700nH N87 33.2mm 70.5mm 32mm - - - - - -
RS Stock No. 647-9389
Mfr. Part No.B66371G0000X187
BrandEPCOS
$16.16
Each (In a Pack of 2)
units
E 70 Transformer 70.5 x 32 x 33.2mm 9700nH N87 33.2mm 70.5mm 32mm - - - - - -
RS Stock No. 647-9367
Mfr. Part No.B66371G0000X127
BrandEPCOS
$12.545
Each (In a Pack of 2)
units
E 32, E 33, E 70 Transformer 70.5 x 32 x 33.2mm 8850nH N27 33.2mm 70.5mm 32mm - - - - - -
RS Stock No. 167-8386
Mfr. Part No.B66371G0000X127
BrandEPCOS
$9.62
Each (In a Box of 30)
units
E 32, E 33, E 70 Transformer 70.5 x 32 x 33.2mm 8850nH N27 33.2mm 70.5mm 32mm - - - - - -
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. 840-7702
Mfr. Part No.FS-1E-3209-10
BrandBlock
$5.55
Each
units
E 32 Reactors, Transformers 32 x 9.5 x 16.4mm 2300nH N87 16.4mm 32mm 9.5mm +210°C - - - - -
RS Stock No. 180-828
Mfr. Part No.B65686A0000R087
BrandEPCOS
$73.76
1 Pair
Pair(s)
PM 74/59 Energy storing choke 85.5 x 75 x 65mm 10000nH N87 - 74mm 59mm - - - - - -
RS Stock No. 180-115
Mfr. Part No.B65807J0000R087
BrandEPCOS
$3.15
1 Pair
Pair(s)
RM 6 Transformer 17.9 x 14.7 x 12.5mm 2400nH N87 12.5mm 17.9mm 14.7mm - - - - - -
RS Stock No. 647-9519
Mfr. Part No.B66397G0000X187
BrandEPCOS
$12.08
Each (In a Pack of 2)
units
ETD 59 SMPS transformer 59.8 x 31.2 x 22.1mm 5300nH N87 22.1mm 59.8mm 31.2mm - - - - - -
RS Stock No. 167-8302
Mfr. Part No.B65686A0000R087
BrandEPCOS
$71.38
Each
units
PM 74/59 Energy storing choke 85.5 x 75 x 65mm 10000nH N87 - 74mm 59mm - - - - - -
RS Stock No. 167-8304
Mfr. Part No.B66397G0000X187
BrandEPCOS
$7.83
Each (In a Box of 40)
units
ETD 59 SMPS transformer 59.8 x 31.2 x 22.1mm 5300nH N87 22.1mm 59.8mm 31.2mm - CRL - - - -
RS Stock No. 167-8248
Mfr. Part No.B65807J0000R087
BrandEPCOS
$1.52
Each
units
RM 6 Transformer 17.9 x 14.7 x 12.5mm 2400nH N87 12.5mm 17.9mm 14.7mm - - - - - -
RS Stock No. 840-7608
Mfr. Part No.FS-1E-2507-05
BrandBlock
$2.80
Each
units
E 25 Reactors, Transformers 25 x 7.5 x 12.8mm 1850nH N87 12.8mm 25mm 7.5mm +210°C - - - - -
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. 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. 213-4470
Mfr. Part No.B67345B0001X027
BrandEPCOS
$62.74
Each
units
U 93 Power transformer 93 x 76 x 30mm 5400nH N27 30mm 93mm 76mm - - - - - -
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