Cores for Common Mode Chokes(2631801102)
31 CORES FOR COMMON MODE CHOKES
31 Material
Suppression Components
Bare Core
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Part Number: 2631801102
31 CORE FOR COMMON MODE CHOKES
Explanation of Part Numbers:
– Digits 1 & 2 = Product Class
– Digits 3 & 4 = Material Grade
– Last digit 2 = Burnished (All cable cores have been burnished to remove the sharp edges)
Fair-Rite offers a broad selection of ferrite EMI suppression cable cores in several materials with guaranteed minimum impedance specifications.
For smaller suppression parts, refer to the section EMI Suppression Beads.
Our Expanded Cable and Suppressor Kit (part number 0199000005) contains a selection of these suppression cores.
For any cable suppression core not listed here, feel free to contact our customer service group for availability and pricing.
The C dimension may be modified to suit specific applications.
Weight: 2.4 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 12.7 | ±0.25 | 0.5 | _ |
| B | 7.9 | ±0.20 | 0.311 | _ |
| C | 6.35 | ±0.25 | 0.25 | _ |
Chart Legend
Σl/A : Core Constant, le : Effective Path Length, Ae : Effective Cross-Sectional Area, Ve : Effective Core Volume
AL : Inductance Factor 
| Typical Impedance (Ω) | |
| 1 MHz+ | 28.7 |
| 5 MHz+ | 46 |
| Electrical Properties | |
| Ae(cm2) | 0.15 |
| le(cm) | 3.12 |
| Ve(cm3) | 0.47 |
A MZn ferrite designed specifically for EMI suppression applications from as low as 1 MHz up to 500 MHz. This material does not have the dimensional resonance limitations associated with conventional MZn ferrite materials.
Available in 31 Material®:
Round Cable EMI Suppression Cores
Round Cable Snap-Its
Flat Cable EMI Suppression Cores
Flat Cable Snap-Its
31 Material® Characteristics
| Property | Unit | Symbol | Value |
| Initial Permeability@B < 10 gauss | µi | 1500 | |
| Flux Density @ Field Strength | Gauss Oersted |
B H |
3600 5 |
| Residual Flux Density | Gauss | Br | 2600 |
| Coercive Force | Oersted | Hc | 0.34 |
| Loss Factor @ Frequency | 10 -6 MHz |
Tan δ/ µi | 20 0.1 |
| Temperature Coefficient of Initial Permeability (20 -70°C) | %/°C | 1.3 | |
| Curie Temperature | °C | Tc | >130 |
| Resistivity | Ω cm | ρ | 3000 |
**** 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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