Epcos AG issues 6 standard sizes of EP ferrite cores and 4 standard sizes of EPO and EPX-configured ferrite cores made from power and wideband ferrite brands. EP, EPO, EPX ferrite cores are intended for using as magnetic circuits of transformers. Cubical construction of cores provides a high degree of space saving on printed circuit board.
Magnetic circuits based on EP, EPO, EPX ferrite cores that are made from N30, T38, T65, T57 wideband materials are characterized by high degree of noise immunity, small value of leakage inductance and are widely used for a manufacture of small-size signaling and subscriber transformers and in xDSL links.
For power applications in a frequency range of up to 300 kHz a series of EP7-EP20 magnetic circuits made from N87 ferrite brand, is used. Detailed information on characteristics of Epcos materials and recommendations for their selection see here.
A wide range of frames for three-dimensional and surface mounting and of mounting brackets provides a modularity of construction for a finished transformer and simplifies a process of installation on printed circuit board.
Nomenclature of ferrite cores EP (ru).
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Ferrite Cores EP
Ferrite Cores EP, EPX
Geometric Dimensions of EP, EPO, EPX Ferrite Cores
| Standard Size | A [mm] | B [mm] | C [mm] | D [mm] | E [mm] | F [mm] | H [mm] |
| EP 5 | 6,15-0,3 | 5,7-0,2 | 3,9-0,25 | 1,9+0,2 | 4,3+0,25 | 1,8-0,15 | |
| EP 7 | 9,4-0,4 | 7,5-0,2 | 6,5-0,3 | 2,5+0,2 | 7,2+0,4 | 3,4-0,2 | 1,7±0,1 |
| EP 10 | 11,8-0,6 | 10,4-0,2 | 7,85-0,4 | 3,6+0,2 | 9,2+0,4 | 3,45-0,3 | 1,85±0,1 |
| EP 13 | 12,8-0,6 | 13,0-0,3 | 9,0-0,4 | 4,5+0,2 | 9,7+0,6 | 4,5-0,3 | 2,4±0,1 |
| EP 17 | 18,4-0,8 | 17,0-0,6 | 11,25-0,3 | 11,0+0,6 | 11,6+0,8 | 5,85-0,5 | 3,25 max |
| EP 20 | 24,5-1,0 | 21,6-0,4 | 15,3-0,7 | 14,0+0,6 | 16,1+0,8 | 9,0-0,5 | 4,5±0,2 |
| EPX 7/9 | 9,4-0,4 | 7,5-0,2 | 9,0-0,4 | 4,6+0,4 | 7,2+0,4 | 3,4-0,2 | |
| EPX 9/9 | 9,4-0,4 | 9,5-0,2 | 9,0-0,4 | 6,6+0,4 | 7,2+0,4 | 3,4-0,2 | |
| EPX 10 | 11,8-0,6 | 10,4-0,2 | 7,85-0,4 | 7,2+0,4 | 9,1+0,4 | 3,45-0,3 | |
| EPO 13 | 12,8-0,6 | 13,0-0,3 | 7,4-0,4 | 9,0+0,4 | 9,7+0,6 | 4,5-0,3 |
Lepcos Co. recommends also to use with EP-configured ferrite cores made by Epcos AG the additional nomenclature of non-expensive winding frames and cramps (ru) from other companies.
Designation in Design Documentation
Designation of EP, EPX, EPO ferrite cores in design documentation.
Measurement unit — set
N87 EP7 B65839-A-R87
B65839 — standard size code EP7
R — value of variation for single-turn inductance coefficient (±25%)
87 — ore is made from N87 ferrite brand.
Example of assembling a set on EP-configured cores
Additional Information
To decrease losses on transportation and storage, it is recommended (as possible) to order EP, EPX, EPO cores in multiples of amounts contained in factory packages. Information on number of cores in standard factory foam plastic package is given here (ru).
