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SM Beads (Differential-Mode)

Part Number: 2752555577
Higher Frequencies 250-1000 MHz (52 & 61 materials)
Suppression Components
Board Component
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SM Beads (Differential-Mode)

Part Number: 2752555577


Explanation of Part Numbers:
– Digits 1 & 2 = Product Class
– Digits 3 & 4 = Material Grade
•– Last digit 6 = Bulk Packed, 7 = Taped and Reeled

Surface mount beads are available from Fair-Rite in several materials and sizes. Their rugged construction lowers the dc resistance and increases current carrying capacity compared to plated beads.

•Wires are oxygen free high conductivity copper with 100% matte tin plating over a nickel undercoating.

•SM Beads meet the solderability specifications when tested in accordance with MIL-STD-202, method 208. After dipping the mounting site of the bead, the solder surface shall be at least 95% covered with a smooth solder coating. The edges of the copper strip are not specified as solderable surfaces.

•After preheating the beads to within 100 °C of the soldering temperature, the parts meet the resistance to soldering requirements of EIA-186-10E, temperature 260 ±5 °C and time 10 ±1 seconds.

•Recommended storage and operation temperature is -55 °C to 125 °C.

•Our “Surface Mount Bead Kit” (part number 0199000025) is available for prototype evaluation.

Packaging Options:
••– SM Beads on 12 mm tape width are supplied taped and reeled per EIA 481 and IEC 60286-3 standards. SM Beads on 16 and 24 mm tape widths are supplied taped and reeled per EIA 481 and IEC 60286-3 standards. Taped and reeled parts are supplied on a 13″ reel.
•– SM Beads can also be supplied not taped and reeled and then are bulk packed. This packing method will change the last digit of the part number to a “6”.

•For any SM Bead requirement not listed, please contact our customer service group for availability and pricing.

Suggested land patterns are in accordance with the latest revision of IPC-7351.

Weight: 0.96 (g)

Dimmmmm tolnominal inchinch misc.
Land Patterns
Reel Information
Tape Width mmPitch mmParts 7" ReelParts 13" ReelParts 14" Reel

Chart Legend
+ Test frequency

Typical Impedance (Ω)
100 MHz700
250 MHz+770
500 MHz+440
1000 MHz250
Electrical Properties

•SM Beads are controlled for impedance limits only. Minimum impedance values are specified for the + marked frequencies. The minimum impedance is typically the listed value less 20%. SM Beads in 73, 43 and 44 materials are measured for impedance on the 4193 Vector Impedance Analyzer. The 52 and 61 SM Beads are tested for impedance on the 4291A RF Impedance Analyzer.

•The maximum practical current rating for these SM Beads is 5 amps, check the component bias curves. The 019/021/037
and 044 SM Beads can withstand a continuous current of 10 amps resulting in a component temperature rise < 40 °C

Typical Impendance (Ω)
100 MHz 700
250 MHz+ 770
500 MHz+ 440
1000 MHz 250

A new high frequency NiZn ferrite material that combines a high saturation flux density and a high Curie temperature.

Available in 52 material:
SM Beads
PC Beads
Range Of  Rod Cores

52 Material Characteristics
Property Unit Symbol Value
Initial Permeability @ B < 10 gauss µi 250
Flux Density @ Field Strength Gauss
Residual Flux Density Gauss Br 3300
Coercive Force Oersted Hc 0.60
Loss Factor @ Frequency 10 -6
Tan δ/ µi 45
Temperature Coefficient of Initial Permeability (20 -70°C) %/°C .75
Curie Temperature °C Tc >250
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)
Specific Gravity
≈4.7 g/cm3
The above quoted properties are typical for Fair-Rite MnZn and NiZn ferrites.

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