Part Number: 6678404121
78 PQ CORE SET
PQ cores were developed for use in power applications. The large surface area to volume of the core aids in heat dissipation. PQ cores are employed both in filter and transformer designs for switch mode power supplies.
PQ cores can be supplied with the centerpost gapped to a mechanical dimension or an ALvalue.
Weight indicated is per pair or set.
Weight: 97 (g)
Chart Legend
•Dimensions (Top numbers are in millimeters, bottom numbers are in nominal inches.).
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 40.5 | ± 0.90 | 1.594 | _ |
| B | 19.88 | ± 0.13 | 0.782 | _ |
| C | 27.93 | ± 0.53 | 1.1 | _ |
| D | 14.75 | ± 0.15 | 0.581 | _ |
| E | 36.4 | min | 1.434 | min |
| F | 14.7 | ± 0.30 | 0.579 | _ |
| G | 27.2 | min | 1.071 | min |
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) | 4300 ±25% |
| Ae(cm²) | 1.98 |
| Σl/A(cm⁻¹) | 5.23 |
| le(cm) | 10.36 |
| Ve(cm³) | 20.5 |
| Amin(cm²) | 1.7 |
AL value is measured at 1 kHz, B < 10 gauss.