ETD Cores (9578444502)Part Number: 9578444502
78 ETD CORE SET
ETD cores have been designed to make optimum use of a given volume of ferrite material for maximum throughput power, specifically for forward converter transformers. The structure, which includes a round center post, approaches a nearly uniform cross-sectional area throughout the core and provides a winding area that minimizes winding losses. ETD cores are used mainly in switched-mode power supplies and permit off-line designs where IEC and VDE isolation requirements must be met.
ETD cores can be supplied with the center post gapped to a mechanical dimension or an ALvalue.
Weight indicated is per pair or set.
Weight: 94 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 44 | ± 0.75 | 1.732 | _ |
| B | 22.3 | ± 0.20 | 0.878 | _ |
| C | 14.8 | ± 0.35 | 0.583 | _ |
| D | 16.5 | ± 0.20 | 0.65 | _ |
| E | 32.5 | min | 1.28 | min |
| F | 14.8 | ± 0.35 | 0.583 | _ |
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) | 3600 ±25% |
| Ae(cm2) | 1.73 |
| Σl/A(cm-1) | 6 |
| le(cm) | 10.35 |
| Ve(cm3) | 17.94 |
| Amin(cm2) | 1.717 |
AL value is measured at 1 kHz, B < 10 gauss