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Wound Beads (2961666681)

Part Number: 2961666681
61 WOUND BEAD
Higher Frequencies 50-500 MHz (61 material)
Suppression Components
Board Component
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Wound Beads

Part Number: 2961666681

61 WOUND BEAD

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

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. 

Weight: 1.4 (g)

Dimmmmm tolnominal inchinch misc.
A6±0.250.236_
B0.75+0.150.032_
C10±0.250.394_
D3.5Ref0.138Ref
Winding Information
Turns TestsWire Size1st Wire Length2nd Wire Length
2 x 1½0.53
24 AWG
38.0 ±3.0
(1.500”)
28.0 ±3.0
(1.102”)

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

Typical Impedance (Ω)
10 MHz75
50 MHz+280
100 MHz+380
200 MHz+510
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%.

The 44 material beads and wound beads are tested on the 4193A Vector Impedance Meter. The 61 material parts on the 4291A RF Impedance Analyzer.

Typical Impendance (Ω)
10 MHz 75
50 MHz+ 280
100 MHz+ 380
200 MHz+ 510
400 MHz 600

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.

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
Toroids
Rods
Antenna/RFID
Rods
Round EMI Suppression Cores

61 Material Characteristics
Property Unit Symbol Value
Initial Permeability @ B < 10 gauss µi 125
Flux Density @ Field Strength Gauss
Oersted
B
H
2500
15
Residual Flux Density Gauss Br 1000
Coercive Force Oersted Hc 1.1
Loss Factor @ Frequency 10 -6
MHz
Tan δ/ µi 30
1.0
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.

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)
650
Specific Gravity
≈4.7 g/cm3
The above quoted properties are typical for Fair-Rite MnZn and NiZn ferrites.


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