ETD Cores (9598394002*)
98 ETD CORE SET
98 Material
Inductive Components
Closed Magnetic Circuit
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Part Number: 9598394002
98 ETD CORE SET
ETD cores have been designed to make optimum use of a given volume of ferrite material for maximum throughput power, specifically for forward converter transformers. The structure, which includes a round center post, approaches a nearly uniform cross-sectional area throughout the core and provides a winding area that minimizes winding losses. ETD cores are used mainly in switched-mode power supplies and permit off-line designs where IEC and VDE isolation requirements must be met.
ETD cores can be supplied with the center post gapped to a mechanical dimension or an ALvalue.
Weight indicated is per pair or set.
Weight: 60 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 39.1 | ± 0.70 | 1.539 | _ |
| B | 19.8 | ± 0.20 | 0.78 | _ |
| C | 12.7 | ± 0.35 | 0.5 | _ |
| D | 14.6 | ± 0.20 | 0.575 | _ |
| E | 29.3 | min | 1.154 | min |
| F | 12.7 | ± 0.35 | 0.5 | _ |
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) | 3000 ±25% |
| Ae(cm2) | 1.28 |
| Σl/A(cm-1) | 7.2 |
| le(cm) | 9.24 |
| Ve(cm3) | 11.85 |
| Amin(cm2) | 1.267 |
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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