PC Beads (Through Hole)
44 PC BEAD
44 Material
Suppression Components
Board Component
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Part Number: 2944778101
44 PC BEAD
Explanation of Part Numbers:
– Digits 1 & 2 = Product Class
– Digits 3 & 4 = Material Grade
– Last digit 1 = Standard Wire Length 2.4 mm (0.095″) Minimum, 2 = Wire Length 3.1 mm (0.122) Minimum
Multiple single turn or multi-turn printed circuit EMI suppression beads are available in two Fair-Rite materials. The broadband 44 material and in the high frequency 52 material grade.
Wires are oxygen free high conductivity copper with 100% matte tin plating over a nickel undercoating. Wires on top of the beads are covered with a layer of epoxy.
Recommended operating and storage temperature for the PC Beads is -55 °C to +125 °C.
PC Beads can be supplied with lower component heights “C”. Also, the wire length “F” can be modified to specific requirements.
Weight: 2.7 (g)
| Dim | mm | mm tol | nominal inch | inch misc. |
| A | 11.2 | -0.50 | 0.431 | _ |
| B | 5.75 | -0.50 | 0.217 | _ |
| C | 11.8 | Max | 0.464 | Max |
| D | 2.54 | ±0.10 | 0.1 | _ |
| E | 2.54 | ±0.10 | 0.1 | _ |
| F | 2.79 | ±0.25 | 0.110 | _ |
| G | 0.65 | _ | 0 | 22 AWG |
Chart Legend
+ Test frequency
| Typical Impedance (Ω) | |
| 10 MHz | 132 |
| 25 MHz+ | 205 |
| 100 MHz+ | 314 |
| 250 MHz | 323 |
PC Beads are controlled for impedance only. Minimum impedance values are specified for the + marked frequencies. The minimum impedance is typically the listed impedance less 20%.
The PC Beads in 44 material are measured on the E4990A Impedance Analyzer. The 52 PC Beads are tested for impedance on the E4991A / HP4291B Impedance Analyzer.
| Typical Impendance (Ω) | |
| 10 MHz | 115 |
| 25 MHz+ | 188 |
| 100 MHz+ | 288 |
| 250 MHz | 305 |
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 | 150 1.0 |
| Temperature Coefficient of Initial Permeability (20 -70°C) | % / °C | 1.6 | |
| 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.
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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