EFD Cores (8978202021*)
78 EFD CORE SET
78 Material
Inductive Components
Closed Magnetic Circuit
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Part Number: 8978202021
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: 7 (g)
Dim | mm | mm tol | nominal inch | inch misc. |
A | 20 | ± 0.55 | 0.787 | _ |
B | 10 | ± 0.25 | 0.394 | _ |
C | 6.65 | ± 0.20 | 0.262 | _ |
D | 7.7 | ± 0.25 | 0.303 | _ |
E | 15.4 | ± 0.50 | 0.606 | _ |
F | 8.9 | ± 0.30 | 0.35 | _ |
K | 3.6 | ± 0.15 | 0.142 | _ |
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) | 1200 ±25% |
Ae(cm2) | 0.31 |
Σl/A(cm-1) | 15.6 |
le(cm) | 4.74 |
Ve(cm3) | 1.44 |
Amin(cm2) | 0.29 |
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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