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.
Recommended Soldering Profile
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: 0.3 (g)
Dim mm mm tol
A
2.85 ±0.20
B
3.05 ±0.10
C
9.6
-0.95
D
1.5
±0.50
nominal inch
0.112
0.12
0.359
0.059
inch misc.
_
_
_
_
Land Patterns
V
W
4.50
7.50
(0.177”)
(0.295”)
X
1.80
(0.071”)
Y
3.00
(0.118”)
Z
_
Chart Legend
+ Test frequency
Typical Impedance (Ω)
100 MHz
69
+
250 MHz
94
+
500 MHz
106
1000 MHz
118
Electrical Properties
Max
1.2
Rdc(mΩ)
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
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
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