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Wound Beads (2944666631)

Part Number: 2944666631
44 WOUND BEAD
Broadband Frequencies 1-200 MHz (44 material)
Suppression Components
Board Component
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Wound Beads

Part Number: 2944666631

44 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
30.53
24 AWG
38.0 ±3.0
(1.500”)
_

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

Typical Impedance (Ω)
1 MHz115
10 MHz+500
50 MHz+1000
100 MHz+690
200 MHz400

•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)
1 MHz 115
10 MHz+ 500
50 MHz+ 1000
100 MHz+ 690
200 MHz 400

A NiZn ferrite developed to combine a high suppression performance, from 30 MHz to 500 MHz, with a very high DC resistivity.

Available in 44 material:
SM Beads
PC Beads
Wound Beads
Round Cable Snap-Its
Connector EMI Suppression Plates

44 Material Characteristics
Property Unit Symbol Value
Initial Permeability@ B < 10 gauss µi 500
Flux Density @ Field Strength Gauss
Oersted
B
H
3000
10
Residual Flux Density Gauss Br 1100
Coercive Force Oersted Hc 0.45
Loss Factor @ Frequency 10 -6
MHz
Tan δ/ µi 125
1.0
Temperature Coefficient of Initial Permeability (20 -70°C) % / °C 0.75
Curie Temperature °C Tc >160
Resistivity ohm-cm ρ 1×109

**** 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.

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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