2673021801 Fair-Rite, 2673021801 Datasheet - Page 166

• Manufacturer Part Number: 2673021801
• Description: EMI/RFI Suppressors & Ferrites Z=94ohms @ 10MHz
• Manufacturer: Fair-Rite

Specifications of 2673021801

• Shielding: Unshielded
• Test Frequency: 100 MHz
• Product: Ferrite Beads
• Impedance: 95 Ohms
• Operating Temperature Range: - 55 C to + 125 C
• Termination Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Fair-Rite Products Corp.
Phone: (888) FAIR RITE / [phone]
166
The following example illustrates the use of the Hanna curve in
the design of an inductor.
Inductor specifications:
Step 1. Initial Core Selection.
Using the Hanna curve for 78 material of Figure 2, select a value
for LI
between 10
ferrite too hard and the dc resistance is apt to be high. Anything
lower than 10
resistance will be quite low.
Select therefore LI
Calculate V
Select E core (preferred core shape), based upon the calculated
core volume of 3.8 cm
Fair-Rite E cores are considered:
The 9478014002 is closest and will be used in this inductor
design. The core parameters for this E core set are:
Recalculate
Step 2. Number of Turns, Wire Size and Wire Fit.
From Figure 2, a LI
Calculate turns N from the formula H = .4
From the core dimensions, the core winding area can be
calculated, see Table 1.
Winding area for a set of E cores 9478014002 is:
Technical Information
Minimum inductance
Direct current
Alternating ripple current
Maximum dc resistance
V
L
I
V
9478015002
9478014002
l
LI
N = 17 x 4.9/.4 x
A
A
2
e
min
e
e
w
w
/ V
= 4.9 cm, A
2
[phone]
= .255 (.740-.250) = .125 inch
= D (E-F) in inch
/ V
e
= LI
= 1 mH, design for L = 1.1 10
= I
= 1.1 10
approximately mid range on the vertical axis, that is
e
-4
e
= 1.1 10
dc
from:
and 10
2
-4
+ I
/3.5 10
will result in a conservative design and the dc
ac
-3
e
2
/2 = 1 + 0.2/2 = 1.1 A
2
= .80 cm
x 1.1
/ V
/ V
-3
-3
V
V
. Any value greater than 10
-4
3
x 1.1
p
e
e
e
e
from the catalog, pages xx and xx. Two
= 1.95 cm
= 3.92 cm
= 3.4 10
= 3.5 10
x 1.1 = 60.3 or 61 turns.
2
2
.
/3.5 10
2
/3.92 = 3.4 10
2
and V
-4
-4
-4
yields a H value of 17 oersted.
L
I
I
R
3
3
dc
ac
= 3.8 cm
.
and
dc
e
= 3.92 cm
= 1 mH
= 1 A
= 0.2 A
< 0.2
2
.
-3
H
-4
p
.
3
W
NI /
• FAX: (888) FERRITE / [phone] • www.fair-rite.com • E-Mail: [e-mail]
3
.
l
-3
e
will work the
oersted.
[phone]
Since the winding area of the appropriate bobbin is smaller than
the core winding area, a correction factor F
determine the bobbin winding area. Figure 3 gives this correction
factor F
A set of E cores 9478014002 has a A
3 can be determined that the F
winding area is .55 x .125 = .069 inch
current density of 1 mA per circular mil or 1275 A per inch
initial wire size selection of 20 AWG can be made from the Wire
Table on page xx. To determine the dc resistance of the winding,
first find the average length of turn from Table 2.
Figure 2
LI
V
P.O. Box J,One Commercial Row, Wallkill, NY 12589-0288
e
2
Note: (914) Area Code has changed to (845).
10
10
10
10
-2
-3
-4
-5
c
as a function of the calculated core winding area A
1
Hanna curve for core sets in 78 material.
e
= air gap
= effective path length of core set
Table 2
Mean Length of Turn (inch)
Table 1
Core Winding Area (inch
E Cores
ETD Cores
PQ Cores
Pot Cores
EP Cores
E Cores
ETD Cores
PQ Cores
Pot Cores
EP Cores
e
10
=.002
H (oersted)
=.005
=.010
c
= .55, therefore the bobbin
=.015
w
.5 p (E+F)
.5 p (E+F)
.5 p (E+F)
.5 p (E+F)
2 (C+E)
= .125 inch
D(E-F)
D(E-F)
=.020
D(E-F)
D(E-F)
D(E-F)
2
2
100
. Using a conservative
)
=.050
=.070
c
has to be used to
=.100
=.150
2
14th Edition
, from Figure
1000
2
, an
w
.