Part Number: 8978151521
78 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: 2.8 (g)
Chart Legend
•Dimensions (Top numbers are in millimeters, bottom numbers are in nominal inches.).
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 15 | ± 0.40 | 0.591 | _ |
| B | 7.5 | ± 0.15 | 0.295 | _ |
| C | 4.65 | ± 0.20 | 0.183 | _ |
| D | 5.5 | ± 0.15 | 0.217 | _ |
| E | 11 | ± 0.40 | 0.433 | _ |
| F | 5.3 | ± 0.20 | 0.209 | _ |
| K | 2.4 | ± 0.10 | 0.094 | _ |
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) | 880 ±25% |
| Ae(cm²) | 0.154 |
| Σl/A(cm⁻¹) | 22.3 |
| le(cm) | 3.44 |
| Ve(cm³) | 0.531 |
| Amin(cm²) | 0.127 |
AL value is measured at 1 kHz, B < 10 gauss.