SM Beads (Differential-Mode)
Part Number: 2761021446
61 SM BEAD
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.
– 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: 0.3 (g)
|Dim||mm||mm tol||nominal inch||inch misc.|
|Typical Impedance (Ω)|
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)|
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
Round Cable Snap-Its
Round EMI Suppression Cores
61 Material Characteristics
|Initial Permeability @ B < 10 gauss||µi||125|
|Flux Density @ Field Strength||Gauss
|Residual Flux Density||Gauss||Br||1000|
|Loss Factor @ Frequency||10 -6
|Tan δ/ µi||30
|Temperature Coefficient of Initial Permeability (20 -70°C)||%/°C||.10|
**** 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.