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Planar Cores (7898400121)

Part Number: 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.

Catalog Drawing
3D Model

Weight: 1.1 (g)

Dimmmmm tolnominal inchinch misc.
A14± 0.300.551_
B3.5± 0.100.138_
C5± 0.150.197_
D1.9min0.075min
E10.52min0.415min
F3± 0.100.118_
G1.8± 0.100.071_

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

Specific Heat
0.25 cal/g/°C
Thermal Conductivity
3.5 - 4.5 mW/cm-°C
Coefficient of Linear Expansion
8 - 10x10-6/°C
Tensile Strength
4.9 kgf/mm2
Compressive Strength
42 kgf/mm2
Young's Modulus
15x103 kgf/mm2
Hardness (Knoop)
650
Specific Gravity
≈4.7 g/cm3
The above quoted properties are typical for Fair-Rite MnZn and NiZn ferrites.


Storage and Operating Temperature
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