PQ Cores (6678272521*)
78 PQ CORE SET
78 Material
Inductive Components
Closed Magnetic Circuit
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Part Number: 6678272521
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: 36 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 26.5 | ± 0.50 | 1.043 | _ |
| B | 12.5 | ± 0.15 | 0.492 | _ |
| C | 19 | ± 0.40 | 0.748 | _ |
| D | 8.05 | ± 0.15 | 0.317 | _ |
| E | 22.5 | ± 0.40 | 0.886 | _ |
| F | 12 | ± 0.30 | 0.472 | _ |
| G | 15.5 | min | 0.611 | 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) | 4670 ±25% |
| Ae(cm2) | 1.177 |
| Σl/A(cm-1) | 4.59 |
| le(cm) | 5.4 |
| Ve(cm3) | 6.359 |
| Amin(cm2) | 1.131 |
AL value is measured at 1 kHz, B < 10 gauss.
A MnZn ferrite specifically designed for power applications for frequencies up to 200 kHz and low loss inductive applications to 500 kHz.
Available in 78 material:
RFID Rods
Toroids
Mated Parts
78 Material Characteristics
| Property | Unit | Symbol | Value |
| Initial Permeability @ B < 10 gauss | µi | 2300 | |
| Flux Density @ Field Strength | Gauss Oersted |
B H |
4800 5 |
| Residual Flux Density | Gauss | Br | 1500 |
| Coercive Force | Oersted | Hc | 0.20 |
| Loss Factor @ Frequency | 10 -6 MHz |
Tan δ/ µi | 3 0.1 |
| Temperature Coefficient of Initial Permeability (20 -70°C) | %/°C | 1.0 | |
| Curie Temperature | °C | Tc | >200 |
| Resistivity | ohm-cm | ρ | 200 |
**** Characteristic curves are measured on standard Toroids (18/10/6 mm) at 25°C and 10 kHz unless otherwise indicated. Impedance characteristics are measured on standard shield beads (3.5/1.3/6.0 mm) unless otherwise indicated.
Material Safety Data Sheet (MSDS)
Click here to download Complex Permeability vs. Frequency (CSV)
Ferrite Material Constants
Storage and Operating Temperature
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