FERRITE BOBBIN CORES

Ferrite Bobbin cores provide a convenient means of winding RF chokes. Because of their open magnetic path, they can handle more current than toroids of similar effective area. To aid in the design of such chokes, we have provided tables containing inductance, wire turns, wire size and maximum current for each type of bobbin.

(physical dimension graphics)

Dimensions are in inches; AL values are in mh/1000 turns.  
Part Number
A
B
C
D
F
AL
NI
Bobbin #B-77-1111
.196
.107
.500
.400
#22
17
60
Bobbin #B-77-1011
.372
.187
.750
.500
#20
39
130
 
Winding Table: number of turns to completely fill bobbin
Wire Size>
20
22
24
26
28
30
32
34
36
B-77-1111
9
14
23
35
56
88
164
205
400
B-77-1011
24
39
60
93
148
230
425
535
1050
 
#B-77-1111
AL=17
NI=60
Inductance
wire
turns
wire
size
I
(max)
10 µh
24
24
2.50
25 µh
28
26
1.60
50 µh
28
26
1.60
100 µh
77
30
0.78
250 µh
121
31
0.50
500 µh
171
32
0.35
1.0 mh
243
34
0.25
2.5 mh
383
36
0.16
5.0 mh
542
37
0.11
10.0 mh
762
38
0.08
#B-77-1011
AL=39
NI=130
Inductance
wire
turns
wire
size
I
(max)
25 µh
25
20
5.20
50 µh
26
22
3.60
100 µh
50
24
2.60
250 µh
80
26
1.60
500 µh
113
27
1.10
1.0 mh
160
28
0.80
2.5 mh
253
30
0.50
5.0 mh
358
32
0.36
10.0 mh
506
34
0.25
25.0 mh
800
36
0.16
 

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