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Wound Beads (2961666671)

Part Number: 2961666671
61 Material™
Suppression Components
Board Component
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Part Number: 2961666671


Explanation of Part Numbers:
– Digits 1 & 2 = Product Class
– Digits 3 & 4 = Material Grade
– Last digit 1 = Bulk Packed 4 = Taped and Reeled

Six and eleven hole beads, in two NiZn materials, are available both as beads (product class 26) and wound with tinned copper wire in several winding configurations (product class 29).

Wire used for winding is oxygen free high conductivity copper with 100% matte tin plating over a nickel undercoating.

Recommended storage temperature and operating temperature is -55 °C to 125 °C

Recommended Soldering Profile

Packaging Options:
– Parts with a 1 as the last digit of the part number are supplied bulk packed. Wound beads with part numbers 29–666631 and 29–666651 can be supplied radially taped and reeled per IEC 60286-1 and EIA 468-B standards. For these taped and reeled wound beads the last digit of the part number is a 4. Taped and reeled wound beads are supplied 500 pieces on a 13 reel.

For any wound bead requirement not listed in here, please contact our customer service group for availability and pricing. 

Catalog Drawing
3D Model

Weight: 1.4 (g)

Dimmmmm tolnominal inchinch misc.
Winding Information
Turns TestsWire Size1st Wire Length2nd Wire Length
24 AWG
38.0 ±3.0

Chart Legend
+ Test frequency
•A ½ turn is defined as a single pass through a hole.

Typical Impedance (Ω)
10 MHz180
50 MHz+740
100 MHz+990
200 MHz+1050
400 MHz600

Beads are controlled for impedance limits only. Minimum impedance values are specified for the + marked frequencies. The minimum impedance is typically the listed impedance less 20%.

Catalog Drawing

The 44 material beads and wound beads are tested on the E4990A Impedance Meter. The 61 material parts on the E4991A / HP4291B Impedance Analyzer.

Typical Impendance (Ω)
10 MHz 150
50 MHz+ 560
100 MHz+ 780
200 MHz+ 960
400 MHz 600

CSV Drawing

A high frequency NiZn ferrite developed for a range of inductive applications up to 25 MHz. This material is also used in EMI applications for suppression of noise frequencies above 200 MHz. Excellent stability characteristics.

Strong magnetic fields or excessive mechanical stresses may result in irreversible changes in permeability and losses.

Available in 61 material:
EMI Suppression Beads
Beads On Leads
SM beads
Wound Beads
Multi-Aperture Cores
Round Cable Snap-Its
Round EMI Suppression Cores

61 Material Characteristics
Property Unit Symbol Value
Initial Permeability @ B < 10 gauss µi 125
Flux Density @ Field Strength Gauss
Residual Flux Density Gauss Br 1000
Coercive Force Oersted Hc 1.2
Loss Factor @ Frequency 10 -6
Tan δ/ µi 90
Temperature Coefficient of Initial Permeability (20 -70°C) %/°C .10
Curie Temperature °C Tc >300
Resistivity ohm-cm ρ 1×108

**** 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)

Click here to download 61 Material Power Loss Density vs. Flux Density at 25°C

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)
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

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