EFD Cores (8998121221)Part Number: 8998121221
98 EFD CORE SET
EFD (Economical Flat Design) cores have been designed to maximize volume in a low profile geometry. EFD cores allow maximum throughput power density with reasonably low mass for board level installation.
EFD cores can be supplied with the center post gapped to a mechanical dimension or an ALvalue.
Weight indicated is per pair or set.
Weight: 1.8 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 12.5 | ± 0.35 | 0.492 | _ |
| B | 6.2 | ± 0.15 | 0.244 | _ |
| C | 3.5 | ± 0.20 | 0.138 | _ |
| D | 4.55 | ± 0.15 | 0.179 | _ |
| E | 9 | ± 0.35 | 0.354 | _ |
| F | 5.4 | ± 0.20 | 0.213 | _ |
| K | 2 | ± 0.10 | 0.079 | _ |
Chart Legend
Σl/A : Core Constant, le : Effective Path Length, Ae : Effective Cross-Sectional Area, Ve : Effective Core Volume
AL : Inductance Factor 
Explanation of Part Numbers: Digits 1 & 2 = product class and 3 & 4 = material grade.
| Electrical Properties | |
| AL(nH) | 730 ±25% |
| Ae(cm2) | 0.11 |
| Σl/A(cm-1) | 25.9 |
| le(cm) | 2.84 |
| Ve(cm3) | 0.311 |
| Amin(cm2) | 0.108 |
AL value is measured at 1 kHz, B < 10 gauss.