84
14th Edition
Multi-Aperture Cores
Multi-aperture cores are used in balun (balance-unbalance) transformers and find wide application
as broadband transformers in communication and CATV circuits. They are also employed in auto
air bag circuits to guard against accidental activation.
• All multi-aperture cores are supplied burnished.
• For additional technical information on the use of these cores, see section “Use of Ferrites in Broadband Transformers”
found on page 170.
• Multi-aperture cores are controlled for impedance limits only. They are tested for impedance with a single turn through two
holes, using the Hewlett Packard HP 4193A Vector Impedance Meter.
• For impedance vs. frequency curves for these parts, see Figures 4-37.
• For any multi-aperture core requirement not listed in the catalog, please contact our customer service group for
availability and pricing.
E
E
A
H
A
B
H
C
Figure 1
E
A
H
C
B
Figure 2
B
Figure 3
Dimensional letter designations have been changed from the 13th edition catalog and are now in accordance to the MMPA SFG-96.
Dimensions (Bold numbers are in millimeters, light numbers are nominal in inches.)
Typical Impedance( ) 1
25 MHz
Part Number**
Fig.
2873002302
1
2843002302
1
2861002302
1
2873002702
1
2843002702
1
2861002702
1
2873002402
1
2843002402
1
2861002402
1
2873001802
2
2843001802
2
A
3.45±0.25
.136
3.45±0.25
.136
3.45±0.25
.136
7.0±0.25
.276
7.0±0.25
.276
7.0±0.25
.276
7.0±0.25
.276
7.0±0.25
.276
7.0±0.25
.276
6.35±0.25
.250
6.35±0.25
.250
B*
C
2.35±0.25
.093
2.35±0.25
.093
2.35±0.25
.093
3.1±0.25
.122
3.1±0.25
.122
3.1±0.25
.122
6.2±0.25
.244
6.2±0.25
.244
6.2±0.25
.244
6.15±0.25
.242
6.15±0.25
.242
2.0±0.15
.079
2.0±0.15
.079
2.0±0.15
.079
4.2 - 0.25
.160
4.2 - 0.25
.160
4.2 - 0.25
.160
4.2 - 0.25
.160
4.2 - 0.25
.160
4.2 - 0.25
.160
–
–
E
1.45±0.1
.057
1.45±0.1
.057
1.45±0.1
.057
2.9±0.1
.114
2.9±0.1
.114
2.9±0.1
.114
2.9±0.1
.114
2.9±0.1
.114
2.9±0.1
.114
2.75±0.2
.108
2.75±0.2
.108
* This dimension may be modified to suit specific applications.
** Bold part numbers designate preferred parts.
Fair-Rite Products Corp.
Phone: (888) FAIR RITE / (845) 895-2055
(888) 324-7748
H
0.75+0.25
.034
0.75+0.25
.034
0.75+0.25
.034
1.7+ 0.2
.071
1.7+ 0.2
.071
1.7+ 0.2
.071
1.7+ 0.2
.071
1.7+ 0.2
.071
1.7+ 0.2
.071
1.1 + 0.3
.050
1.1 + 0.3
.050
100 MHz
Z, Rs, XL vs.
Frequency
Curve
.1
44
–
Figure 4
.1
–
44
Figure 5
.1
–
38
Figure 6
.3
38
–
Figure 7
.3
–
50
Figure 8
.3
–
44
Figure 9
.5
75
–
Figure 10
.5
–
100
Figure 11
.5
–
88
Figure 12
.8
106
–
Figure 13
.8
–
131
Figure 14
Wt (g)
1
Guaranteed Z Min is Z Typ -20%
P.O. Box J,One Commercial Row, Wallkill, NY 12589-0288
• FAX: (888) FERRITE / (845) 895-2629 • www.fair-rite.com • E-Mail: ferrites@fair-rite.com
(888) 337-7483 Note: (914) Area Code has changed to (845).
