2744051447 Fair-Rite, 2744051447 Datasheet - Page 167

• Manufacturer Part Number: 2744051447
• Description: EMI/RFI Suppressors & Ferrites Z=33 OHM @ 100MHz
• Manufacturer: Fair-Rite

Specifications of 2744051447

• Shielding: Unshielded
• Test Frequency: 100 MHz
• Product: Ferrite Beads
• Impedance: 275 Ohms
• Operating Temperature Range: - 55 C to + 125 C
• Termination Style: Axial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

14th Edition
P.O. Box J,One Commercial Row, Wallkill, NY 12589-0288
Phone: (888) FAIR RITE / [phone]
Figure 3
Average length of turn for E 9478014002 is:
(From the Wire Table, 1000 ft of 20 AWG has a resistance of 10.2 W )
To check for winding fit, multiply the number of turns per square
inch for 20 AWG from the Wire Table with the bobbin winding area
of .069 inch
modate 854 x .069 = 58.9 turns. This is too close to the calculated
turns for an easily manufactured magnetic design. Use 21 AWG
wire instead.
Winding fit for 21 AWG:
Step 3. Air gap.
Going back to Figure 2, for LI
a
To summarize:
Fc
l
1.0
/
.9
.8
.7
.6
.5
.4
.3
.2
.1
l
0
e
l
l
R
R
N = 1065 x .069 = 73.5, well above the require 61 turns.
The gap length = .006 x
l
E core 9478014002
Wire size 21 AWG
0.01
avg.
avg.
ratio of approximately .006 is found.
= .006 x 4.9/2.54 = .012 inch.
dc
dc
[phone]
= 2.48 x 61 x 12.8/12000 = 0.16 W.
= 2 (C+F)
= 2 (.500 + .740) = 2.48 inch.
= 2.48 x 61 x 10.2/12000 = 0.13 W
Correction factor F
2
. For 20 AWG, the bobbin winding area can accom-
A
w
(inch
2
0.1
/ V
l
c
e
Pot Cores
EP Cores
E Cores
PQ Cores
ETD Cores
vs. core winding area A
.
e
N = 61 turns
Gap length .012 inch
= 3.4 10
2
)
-4
and a H = 17 oersted,
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Technical Information
1.0
[phone]
w
.
Fair-Rite Products Corp.
The graphs in Figures 4 through 8 show the inductance factors
or A
and sizes.The air gap determined in the design example and the
air gaps shown in Figures 4 through 8 represent the total air gap.
The most practical way to obtain this air gap is to grind this gap
into the center leg of one of the core halves. Non-metallic shims
can also be used to obtain the desired air gap. This is usually
done by placing shims between the outer legs or outside rims of
the core halves. In cores with a uniform cross-sectional area, the
A
is gapped or shims are used that have a thickness half the total
air gap. For cores that have a non-uniform cross-sectional area
the shim thickness can be calculated from:
The above example of the E core 9478014002, a core with a
uniform cross-sectional area, can therefore use .006 inch shims
between the outer legs.
(nH)
Figure 4 A
A
L
10000
L
value or inductance index will be the same whether the core
1000
L
Note: (914) Area Code has changed to (845).
100
values as a function of the air gaps for the different core types
Shim thickness = total air gap x center mating area
10
0.001
L
vs. gap for E cores in 77 and 78 material.
10
11
12
1
2
3
4
5
6
7
8
9
Air Gap (inch)
1-94--625002 5-94--375002 9-94--015002
2-94--500002 6-94--014002 10-94--016002
3-94--036002 7-94--012002 11-94--020002
4-94--017002 8-94--034002 12-94--019002
0.01
total mating area
0.1
167