MnZn · 5 shape groups · 19 part numbers · Catalogue p. 118–120
EFD / EPC CoreE-type Cores Fig.1 5 Fig.2 5 Fig.3 6 Fig.4 1 Fig.5 2 Fig.1 Fig.1 Shape group 01 / 05 5 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) G(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg EFD6.5 6.50±0.15 3.65±0.10 3.00±0.10 2.50±0.10 5.20±0.15 2.85±0.10 1.70±0.10 4.11 1.01 16.68 4.06 67.80 0.3800 EFD12.8×6.7×5.8 12.80±0.40 5.80±0.20 6.70±0.25 4.25±0.25 9.50min 4.05±0.20 4.85±0.20 1.25 0.0581 26.91 21.53 579.53 3.06 EFD20.8 20.80±0.50 12.10±0.15 4.50±0.20 8.40±0.20 15.00±0.30 9.20±0.15 2.95±0.15 2.09 0.0820 53.50 25.55 1366.84 / EFD24 (NiZn) 24.20±0.40 18.35±0.20 4.50±0.20 10.00±0.20 16.20±0.40 14.25±0.20 3.10±0.15 2.26 0.0672 76.29 33.70 2570.84 / EFD24.5 24.50±0.65 13.50±0.20 9.30±0.20 11.00±0.30 18.30±0.60 9.35±0.25 5.20±0.15 0.9407 0.0153 57.69 61.33 3538.15 20.20
Fig.2 Fig.2 Shape group 02 / 05 5 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) G(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg EFD12.85×3.3×6.85 12.85±0.20 6.85±0.15 3.30±0.15 6.00±0.10 9.40min 4.55±0.15 1.85±0.15 2.45 0.2078 28.98 11.81 342.25 1.90 EFD12.85×3.3×6.85A 12.85±0.20 6.85±0.15 3.30±0.15 6.00±0.10 9.60min 4.55±0.15 1.85±0.15 2.45 0.2078 28.98 11.81 342.25 1.90 EFD14 14.00±0.35 8.65±0.15 3.35±0.15 5.60±0.15 10.60±0.30 6.45±0.15 1.60±0.10 3.62 0.3523 37.23 10.28 382.81 2.25 EFD17×5.3×8.5 17.00+0.00/-0.60 8.50±0.20 5.30±0.20 6.95±0.20 12.65±0.30 6.40+0.30/-0.00 3.20+0.10/-0.20 1.87 0.0872 40.02 21.42 857.23 4.50 EFD21.2×5.9×11.8 21.20±0.40 11.80±0.20 5.90±0.15 9.40±0.20 15.80min 9.20±0.20 3.30±0.10 1.77 0.0579 54.11 30.58 1655.00 8.65
Fig.3 Fig.3 Shape group 03 / 05 6 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) G(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg EFD15 15.00±0.40 7.50±0.15 4.65±0.15 5.30±0.20 11.00±0.35 5.50±0.25 2.20±0.15 2.37 0.1692 33.26 14.02 466.20 2.80 EFD20 20.00±0.55 10.00±0.15 6.65±0.15 8.90±0.20 15.40±0.50 7.70±0.25 3.10ref 1.64 0.0592 45.49 27.73 1261.61 7.00 EFD20×6.65×10A 20.00±0.55 10.00±0.15 6.65±0.15 8.90±0.20 15.40±0.50 7.70±0.25 3.60±0.15 1.52 0.0489 47.00 31.00 1460.00 6.49 EFD25 25.00±0.65 12.50±0.20 9.10±0.20 11.40±0.20 18.70±0.60 9.30±0.25 5.20±0.15 0.9866 0.0175 55.53 56.28 3125.34 16.20 EFD25.6 25.60±0.65 12.40±0.20 9.10±0.20 11.35±0.20 19.60±0.45 21.30+0.40/-0.00 9.20±0.20 — — — — — — EFD30 30.00±0.65 15.00±0.20 9.10±0.20 14.60±0.30 23.30+0.50/-0.00 11.20±0.30 4.90±0.15 1.04 0.0163 66.35 63.86 4237.26 24.35
Fig.4 Fig.4 Shape group 04 / 05 1 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) G(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg EFD21.8×6.5×12C 21.80±0.30 12.00±0.20 6.50±0.15 2.80±0.10 8.80ref 8.40±0.20 / — — — — — —
Fig.5 Fig.5 Shape group 05 / 05 2 part numbers P/N Dimensions · mm (nominal / tolerance) Effective parameters F A(mm) B(mm) C(mm) D(mm) E(mm) F(mm) G(mm) C1mm⁻¹ C2mm⁻³ Lemm Aemm² Vemm³ ≈Wtg EPC13A 13.80±0.30 7.25±0.15 4.60±0.15 5.60±0.15 11.60±0.30 5.15±0.15 2.10±0.15 2.37 0.2157 26.10 11.00 287.10 2.40 EPC17A 17.80±0.40 8.75±0.20 6.00±0.30 7.70±0.20 14.80min 6.25±0.20 2.80±0.15 1.93 0.1189 31.20 16.20 505.44 4.00
This table only shows common product numbers. If the EFD/EPC core you need is not listed in the above table, please do not hesitate to contact us.
Calculated from nominal dimensions per IEC 60205: C1 = ΣL/A, C2 = ΣL/A², Le = C1²/C2, Ae = C1/C2, Ve = Le×Ae; Amin = minimum cross-section; values for paired sets apply to the assembled set. ≈Wt is a reference fired-core weight — actual values vary with material and sintering, not a specification commitment; part numbers not listed have no effective-parameter data yet.
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