EMI Suppression Beads (2661000801)
Part Number: 2661000801
Explanation of Part Numbers:
– Digits 1 & 2 = Product Class
Digits 3 & 4 = Material Grade
Last digit 1= Not Burnished 2 = Burnished
The last digit of the Parylene coated part is a “4,” which is available upon request. The minimum coating thickness beads is
0.005 mm (0.0002″).
Fair- Rite offers a broad selection of ferrite EMI suppression beads with guaranteed minimum impedance specifications.
Our “Shield Bead Kit” (part number 0199000019) contains a selection of these beads.
For any EMI suppression bead requirement not listed here, feel free to contact our customer service for availability and
Catalog Drawing
3D Model
The C dimension, the bead length, can be modified to suit specific applications.
Weight: 1 (g)
Chart Legend
+ Test frequency
The column "H (Oe)" gives for each bead the calculated dc bias field in oersted for 1 turn and 1 ampere direct current. The
actual dc H field in the application is this value of “H” times the actual NI (ampere- turn) product. For the effect of the dc bias
on the impedance of the bead material, see figures 18-23 in the application note How to choose Ferrite Components for EMI
Typical Impedance (Ω)
100 MHz 75
250 MHz+103
500 MHz+120
1000 MHz 143
Electrical Properties
H(Oe) 1
Suppression beads are controlled for impedances only. Minimum impedance values are specified for the + marked frequencies.
The minimum impedance is typically the listed impedance less 20%.
Single turn impedance tests for 73 and 43 material beads are performed on the 4193A Vector Impedance Analyzer. The 61
material beads are tested on the 4291A RF Impedance Analyzer. Beads are tested with the shortest practical wire length.
Dim mm mm tol nominal inch inch misc.
A 7.5 ±0.25 0.296 _
B 2.25 +0.25 0.094 _
C 7.55 ±0.25 0.297 _
Fair- Rite Products Corp. One Commercial Row, Wallkill, New York 12589-0288
888-324-7748 845-895-2055 Fax: 845-895-2629 ferrites@fair- rite.com www.fair- rite.com