Chokes and inductors
For high frequency and EMC
RF chokes, BC series
Series/Type:
B78108S / B78148S
November 2005
7f
fÁRspp
Date:
©
EPCOS AG 2005. Reproduction, publication and dissemination of this document and the infor-
mation contained therein without EPCOS’ prior express consent is prohibited.
RF chokes
BC series
BC chokes (Bobbin Core)
Rated current 55 to 1200 mA
Rated inductance 1 to 4700
N
H
Construction
■
Ferrite drum core
■
Winding: enamel copper wire
■
Flame-retardant lacquer coating
B78108S
B78148S
Features
■
■
■
■
Wide inductance range
Suitable for general-purpose application
Special versions available
RoHS-compatible (see page 6)
Applications
■
RF blocking and filtering
■
Decoupling and interference suppression
■
For antenna systems, automotive electronics,
energy-saving lamps, entertainment electronics
Terminals
■
Central axial leads, lead-free tinned
■
Radially bent to 5 mm lead spacing
Marking
Inductance indicated by color bands to IEC 60062
Delivery mode
Taped, Ammo and reel packing (see page 8)
Dimensional drawings
B78108S (axial leads, taped)
65±1
53
ø0.8 max.
ø4 max.
B78148S (central radial leads, taped)
9.2 max.
(IEC 60294)
6±0.5
5±0.25 5±0.25
16
3.5 min.
11.5 max.
lacquered/lackiert
5
12,7
IND0121-U
IND0429-B
Minimum lead spacing 12.5 mm
Approx. weight 0.38 g
Please read the
Important notes
at the end of
this document.
Schematic drawing (details page 8)
2
11/05
14
RF chokes
BC series
Characteristics and ordering codes
For further technical data see page 6.
L
R
μH
1.0
1.2
1.5
1.8
2.2
2.7
3.3
3.9
4.7
5.6
6.8
8.2
10
12
15
18
22
27
33
39
Toler-
ance
1)
±
10 %
^
K
Q
min
55
55
55
55
55
60
60
60
60
60
65
65
70
70
60
60
55
55
55
50
f
Q
MHz
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
7.96
2.52
2.52
2.52
2.52
2.52
2.52
2.52
2.52
I
R
mA
1200
1150
1100
1030
1000
940
900
850
820
780
670
690
680
650
610
580
560
530
500
470
R
max
Ω
0.16
0.18
0.20
0.22
0.25
0.26
0.29
0.31
0.34
0.38
0.51
0.48
0.49
0.55
0.60
0.67
0.74
0.83
0.92
1.02
f
res, min
MHz
205
185
165
155
140
125
115
105
95
85
75
50
35
30
20
17
13
10
9.0
8.0
B78108S
B78148S
Ordering code
2)
(reel packing)
3)
B781
*
8S1102K000
B781
*
8S1122K000
B781
*
8S1152K000
B781
*
8S1182K000
B781
*
8S1222K000
B781
*
8S1272K000
B781
*
8S1332K000
B781
*
8S1392K000
B781
*
8S1472K000
B781
*
8S1562K000
B781
*
8S1682K000
B781
*
8S1822K000
B781
*
8S1103K000
B781
*
8S1123K000
B781
*
8S1153K000
B781
*
8S1183K000
B781
*
8S1223K000
B781
*
8S1273K000
B781
*
8S1333K000
B781
*
8S1393K000
1) Closer tolerances upon request.
2) Replace the asterisk
*
by code number »0« for axial taping or by »4« for radial taping.
3) For Ammo pack the last digit has to be a »9«. Example: B78108S1102K009
Please read the
Important notes
at the end of
this document.
3
11/05
RF chokes
BC series
Characteristics and ordering codes
(continued)
For further technical data see page 6.
L
R
μH
47
56
68
82
100
120
150
180
220
270
330
390
470
560
680
820
1000
1200
1500
1800
2200
2700
3300
3900
4700
Toler-
ance
1)
±
5%
^
J
Q
min
45
40
40
35
70
70
70
70
70
70
70
70
70
60
55
50
50
50
50
50
40
40
40
40
35
f
Q
MHz
2.52
2.52
2.52
2.52
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.796
0.252
0.252
0.252
0.252
0.252
0.252
0.252
0.252
0.252
I
R
mA
450
430
410
390
370
300
280
270
250
200
190
180
170
160
150
140
130
115
100
95
80
75
62
59
55
R
max
Ω
1.10
1.23
1.35
1.54
1.70
2.40
2.80
3.00
3.30
5.70
6.40
7.00
7.90
8.80
10.0
12.0
14.0
17.5
23.0
26.0
34.7
40.0
59.5
66.0
78.0
f
res, min
MHz
7.5
7.0
6.5
6.0
5.0
4.5
4.2
3.9
3.7
2.8
2.7
2.4
2.2
2.0
1.9
1.6
1.6
1.3
1.25
1.2
1.1
1.0
0.9
0.8
0.7
B78108S
B78148S
Ordering code
2)
(reel packing)
3)
B781
*
8S1473J000
B781
*
8S1563J000
B781
*
8S1683J000
B781
*
8S1823J000
B781
*
8S1104J000
B781
*
8S1124J000
B781
*
8S1154J000
B781
*
8S1184J000
B781
*
8S1224J000
B781
*
8S1274J000
B781
*
8S1334J000
B781
*
8S1394J000
B781
*
8S1474J000
B781
*
8S1564J000
B781
*
8S1684J000
B781
*
8S1824J000
B781
*
8S1105J000
B781
*
8S1125J000
B781
*
8S1155J000
B781
*
8S1185J000
B781
*
8S1225J000
B781
*
8S1275J000
B781
*
8S1335J000
B781
*
8S1395J000
B781
*
8S1475J000
1) Closer tolerances upon request.
2) Replace the asterisk
*
by code number »0« for axial taping or by »4« for radial taping.
3) For Ammo pack the last digit has to be a »9«. Example: B78108S1473J009
Please read the
Important notes
at the end of
this document.
4
11/05
RF chokes
BC series
Impedance |Z |
versus frequency f
measured with impedance analyzer
HP 4191A / HP 4194A
10
6
Ω
| Z|
10
5
IND0122-K
B78108S
B78148S
Inductance L
versus DC load current I
DC
measured with LCR meter
HP 4275A
10
4
µH
L
10
3
1000 µH
4700 µH
IND0123-X
B781*8S
B781*8S
10
4
10
2
10
3
100 µH
10 µH
10
1
10
2
1 µH
10 µH
100 µH
1000 µH
4700 µH
10
6
1 µH
10
0
10
1
10
0
5
10
10
7
10
8
Hz 10
f
9
10
_
1
10
_
2
10
_
1
10
0
A 10
1
I
DC
Q factor
versus frequency f
measured with impedance analyzer
HP 4194A
150
B781*8S
Q
IND0124-C
Current derating I
op
/I
R
versus ambient temperature T
A
(rated temperature T
R
= 40
°C)
1.2
IND0552-S-E
I
op
I
R
1.0
100
1 µH
10 µH
100 µH
1000 µH
4700 µH
50
0.8
0.6
0.4
0.2
0
4
10
0
10
5
10
6
10
7
Hz 10
8
f
0
20
40
60
80
100
˚C 140
T
A
Please read the
Important notes
at the end of
this document.
5
11/05
Analog electronics
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