UF & UI Core
Features of UF cores and UI cores
UF-core and UI-core, these Soft ferrite shapes are available in lamination materials (for stacking), powdered
material (typically powdered iron), and ferrite materials. In laminated form, features of UF cores and UI cores are
similar to that of the "C" core, and can take full advantage of grain orientation while their laminated counterparts
only take about 60% to 80%. UF cores and UI cores possess excellent heat dissipation, and there is lots of room
available for lead wires, but self-shielding is poor. UF core, UI core and other “U” cores have two core legs. Coils
can be placed over either or both legs. Using coils on separate legs is great for high voltage isolation between coils.
The mean turn length of two coils on separate legs (sharing the whole winding window) is smaller than 1 coil on one
leg (occupying the whole winding window), hence the two coils connected in series has less winding resistance.
Application of UF core and UI core:
The U series core features wide distributing permeability and can be chosen and matched according to filter's
frequency. As a power ferrite, it is a good choice using in fields of ignitor and energy-saving products. UF core and
UI core may be used as “split-core” current transformers, output transformer core, line transformer core, and
Inverter core. UF core is mainly application with line filters in color TV sets; UI core: Line filters, Inverter
transformers
Type
UF8.5
UF8.6
UF9.8
UF9.8A
UF10.1
UF10.5
UF10.5A
UF12
UF15A
UF15.7
UF16
Dimensions (mm)
A
8.5±0.2
8.6±0.2
9.8±0.3
9.8±0.3
10.1±0.3
10.5±0.3
10.5±0.4
12.0±0.3
15.0±0.3
15.7±0.6
16.0 +0.4
B
6.4±0.2
6.45±0.2
7.1±0.2
7.1±0.2
7.5±0.25
7.8±0.4
7.8±0.3
9.2±0.3
11.4±0.3
9.7±0.25
10.0±0.3
C
3.45±0.15
3.6±0.2
2.9±0.2
2.7±0.2
2.9±0.2
5.0±0.2
5.0±0.2
3.95±0.15
6.4±0.2
6.0±0.3
6.0±0.2
Dmin
3.8
4.0
4.1
4.1
3.9
5.2
5.2
4.1
5.4
6.3
6.7
E
2.3
2.2±0.15
2.9±0.2
2.8
2.95±0.15
2.4±0.2
2.5
3.85
4.7
4.5±0.2
4.6±0.2
F
4.15±0.15
4.2±0.2
4.3±0.2
4.25±0.2
4.5±0.25
5.3±0.3
5.25±0.25
5.05±0.15
6.5±0.2
6.0±0.3
6.0±0.3
I
-0.2
UF16A
UF19
UF20
UI25.4
UF30
UF30A
UF33
UI17
UI25
s
16.0±0.4
19.7±0.5
19.7±0.3
25.5 +0.4
-0.3
30.0±0.6
30.0±0.5
33.0±0.5
16.3±0.3
25.0±0.5
Core parameter
10.0±0.2
18.25±0.25
17.7±0.2
16.25 +0.25
-0
12.1±0.3
12.7±0.15
13.8±0.15
8.7±0.3
16.0±0.2
6.0±0.2
5.9±0.2
6.0±0.2
6.25 +0.1
-0.15
3.2±0.2
6.25±0.15
7.25 +0.2
-0.15
5.0±0.2
6.2±0.2
6.7
7.4
7.4
12.4
17.0
17.3
18.0
10.6
12.7
4.57
6.0
6.0±0.2
6.45
6.2±0.3
6.25
7.3
2.7±0.2
6.2±0.3
Al(nH/N²)
6.0±0.15
12.2±0.2
11.7±0.2
10.0 +0.3
-0
6.1±0.3
6.2 +0.25
-0
6.2 +0.25
-0
6.4 +0.3
-0.2
10.0±0.3
2.8±0.2
6.0±0.3
6.25 +0.1
-0.05
Type
UF8.5
UF8.6
UF9.8
UF9.8A
UF10.1
UF10.5
UF10.5A
UF12
UF15A
UF15.7
UF16
UF16A
UF19
UF20
UI25.4
UF30
UF30A
UF33
UI17
UI25
C1
(mm-1)
4.05
4.1
4.3
4.46
4.15
3.25
3.2
2.65
1.71
2.01
1.97
1.97
2.29
2.25
1.65
2.04
2.06
1.59
2.58
1.68
Ae
(mm2)
7.76
7.8
8.1
7.60
8.6
12.7
12.5
15.6
30.5
24.8
27.2
25.9
35.3
36.0
38.9
38.3
39.1
53.7
14.0
38.9
Ie
(mm)
31.4
32.2
34.33
34.2
35.7
39.9
40.1
41.3
52.3
50
51.9
51.0
81.0
81.0
64.3
77.9
80.4
85.7
36.1
65.5
Ve
(mm3)
243
251.9
275.9
262
307
506.1
501
645
1600
1240
1412.6
1320
2860
2916
2500
2985.9
3140
4600
505.4
2551
weight (g/pr.)
1.2
1.3
1.4
1.3
1.5
2.8
2.5
3.2
8.0
6.5
7.4
6.9
15
15
19
15.3
17
23
2.6
12.8
F5(±25%)
675
1300
755
1500
930
1200
1840
2600
2600
1610
1590
2100
3080
F7(±25%)
830
960
1500
885
1005
1800
1160
1420
2380
2600
3300
2075
2080
2750
2600
4300
2800
3000
1500
2500
F10(±25%)
1215
1500
1800
1095
1100
2200
1685
3250
4000
2700
3800
6150
A
L
:1kHz,0.5mA,100Ts
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