ETD Cores (9578545402)
78 ETD CORE SET
78 Material
Inductive Components
Closed Magnetic Circuit
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Part Number: 9578545402
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: 180 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 54.2 | ± 1.00 | 2.134 | _ |
| B | 27.1 | ± 0.30 | 1.067 | _ |
| C | 18.9 | ± 0.40 | 0.744 | _ |
| D | 19.5 | ± 0.30 | 0.768 | _ |
| E | 40.5 | min | 1.594 | min |
| F | 18.9 | ± 0.30 | 0.744 | _ |
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) | 5300 ±25% |
| Ae(cm2) | 2.65 |
| Σl/A(cm-1) | 4.7 |
| le(cm) | 12.56 |
| Ve(cm3) | 33.3 |
| Amin(cm2) | 2.4 |
AL value is measured at 1 kHz, B < 10 gauss
Ferrite Material Constants
Storage and Operating Temperature
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