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Round Cable EMI Suppression Cores (2631803802)
Part Number: 2631803802
31 ROUND CABLE CORE
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.
Catalog Drawing
3D Model
The C dimension, the core length, can be modified to suit specific applications.
Weight: 118 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 61 | ±1.30 | 2.4 | _ |
| B | 35.55 | ±0.85 | 1.4 | _ |
| C | 12.7 | ±0.50 | 0.5 | _ |
Chart Legend
+ Test frequency
The column “H (Oe)” gives for each bead the calculated dc bias field in oersted for 1 turn and 1 ampere direct current. The actual dc H field in the application is this value of “H” times the actual NI (ampere-turn) product. For the effect of the dc bias on the impedance of the bead material, see figures 18-23 in the application note How to choose Ferrite Components for EMI Suppression.
| Typical Impedance (Ω) |
| 1 MHz | 10.2 |
| 5 MHz | 32.5 |
| 10 MHz+ | 41 |
| 25 MHz+ | 61 |
| 100 MHz+ | 110 |
| 250 MHz | 175 |
| Electrical Properties |
| H(Oe) | 0.09 |
Suppression cable cores are controlled for impedances only. Minimum impedance values are specified for the + marked frequencies. The minimum impedance is typically the listed impedance less 20%.
Catalog Drawing
Single turn impedance tests for 31® , 43® and 46 material cores are performed on the E4991A/HP4291B Impedance Analyzer. The 61 material parts are tested on the E4991A / HP4291B Impedance Analyzer and 75 material parts are tested on the E4990A Impedance Analyzer. Cores are tested with the shortest practical wire length.
| Typical Impendance (Ω) |
| 1 MHz |
12 |
| 5 MHz |
28 |
| 10 MHz+ |
40 |
| 25 MHz+ |
63 |
| 100 MHz+ |
119 |
| 250 MHz |
215 |
CSV Download
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
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
Printer Friendly Data Sheet - Download as pdf file