Planar Cores (7898400121)
98 PLANAR EI CORE SET
98 Material
Inductive Components
Closed Magnetic Circuit
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Part Number: 7898400121
98 PLANAR EI CORE SET
Planar EE and EI cores, with their low profile are suitable for board level installation allowing assembly without the need for plastic coilformers and can also allow windings integrated into multi-level PCBs. Planar ER cores with their low mass and low profile are suitable for Surface Mount installations in low power filter and transformer applications.
Planar EE, ER and EI cores can be supplied with the center post gapped to a mechanical dimension, or an AL value.
Weight: 1.1 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 14 | ± 0.30 | 0.551 | _ |
| B | 3.5 | ± 0.10 | 0.138 | _ |
| C | 5 | ± 0.15 | 0.197 | _ |
| D | 1.9 | min | 0.075 | min |
| E | 10.52 | min | 0.415 | min |
| F | 3 | ± 0.10 | 0.118 | _ |
| G | 1.8 | ± 0.10 | 0.071 | _ |
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) | 1440 ±25% |
| Ae(cm2) | 0.152 |
| Σl/A(cm-1) | 10.9 |
| le(cm) | 1.66 |
| Ve(cm3) | 0.252 |
| Amin(cm2) | 0.15 |
AL value is measured at 1 kHz, B < 10 gauss.
A low loss MnZn ferrite material for power applications up to 200 kHz.
New type of 98 material is an improved version of Fair-Rite’s 78 material. This material supplies lower power loss at 100°C at moderate flux densities for operation below 200 kHz.
Available in 98 material:
E&I Cores
Pot Cores
RM
PQ
ETD
EFD
EP
EER
Planar Shapes
98 Material Characteristics
| Property | Unit | Symbol | Value |
| Initial Permeability @ B < 10 gauss | µi | 2400 | |
| Flux Density @ Field Strength | Gauss Oersted |
B H |
5000 5 |
| Residual Flux Density | Gauss | Br | 2000 |
| Coercive Force | Oersted | Hc | 0.17 |
| Loss Factor @ Frequency | 10 -6 MHz |
Tan δ/ µi | 3 0.1 |
| Temperature Coefficient of Initial Permeability (20 -70°C) | %/°C | 1.5 | |
| Curie Temperature | °C | Tc | >215 |
| 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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