7ffRspp
Chokes and inductors
For high frequency and EMC
RF chokes, BC series
Series/Type:
B78108S / B78148S
Date:
November 2005
EPCOS AG 2005. Reproduction, publication and dissemination of this document and the infor-
mation contained therein without EPCOS' prior express consent is prohibited.
2
11/05
RF chokes
BC series
B78108S
B78148S
Please read the Important notes at the end of
this document.
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
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)
B78148S (central radial leads, taped)
IND0121-U
14
16
5
12,7
Minimum lead spacing 12.5 mm
Approx. weight 0.38 g
9.2 max.
50.25
11.5 max.
IND0429-B
4 max.
0.8 max.
60.5
651
lacquered/lackiert
(IEC 60294)
3.5 min.
53
50.25
Schematic drawing (details page 8)
3
11/05
RF chokes
B78108S
BC series
Please read the Important notes at the end of
this document.
B78148S
Characteristics and ordering codes
For further technical data see page 6.
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
L
R
H
Toler-
ance
1)
Q
min
f
Q
MHz
I
R
mA
R
max
f
res, min
MHz
Ordering code
2)
(reel packing)
3)
1.0
10 %
K
55
7.96
1200
0.16
205
B781
*
8S1102K000
1.2
55
7.96
1150
0.18
185
B781
*
8S1122K000
1.5
55
7.96
1100
0.20
165
B781
*
8S1152K000
1.8
55
7.96
1030
0.22
155
B781
*
8S1182K000
2.2
55
7.96
1000
0.25
140
B781
*
8S1222K000
2.7
60
7.96
940
0.26
125
B781
*
8S1272K000
3.3
60
7.96
900
0.29
115
B781
*
8S1332K000
3.9
60
7.96
850
0.31
105
B781
*
8S1392K000
4.7
60
7.96
820
0.34
95
B781
*
8S1472K000
5.6
60
7.96
780
0.38
85
B781
*
8S1562K000
6.8
65
7.96
670
0.51
75
B781
*
8S1682K000
8.2
65
7.96
690
0.48
50
B781
*
8S1822K000
10
70
2.52
680
0.49
35
B781
*
8S1103K000
12
70
2.52
650
0.55
30
B781
*
8S1123K000
15
60
2.52
610
0.60
20
B781
*
8S1153K000
18
60
2.52
580
0.67
17
B781
*
8S1183K000
22
55
2.52
560
0.74
13
B781
*
8S1223K000
27
55
2.52
530
0.83
10
B781
*
8S1273K000
33
55
2.52
500
0.92
9.0
B781
*
8S1333K000
39
50
2.52
470
1.02
8.0
B781
*
8S1393K000
^
4
11/05
RF chokes
BC series
B78108S
B78148S
Please read the Important notes at the end of
this document.
Characteristics and ordering codes (continued)
For further technical data see page 6.
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
L
R
H
Toler-
ance
1)
Q
min
f
Q
MHz
I
R
mA
R
max
f
res, min
MHz
Ordering code
2)
(reel packing)
3)
47
5 %
J
45
2.52
450
1.10
7.5
B781
*
8S1473J000
56
40
2.52
430
1.23
7.0
B781
*
8S1563J000
68
40
2.52
410
1.35
6.5
B781
*
8S1683J000
82
35
2.52
390
1.54
6.0
B781
*
8S1823J000
100
70
0.796
370
1.70
5.0
B781
*
8S1104J000
120
70
0.796
300
2.40
4.5
B781
*
8S1124J000
150
70
0.796
280
2.80
4.2
B781
*
8S1154J000
180
70
0.796
270
3.00
3.9
B781
*
8S1184J000
220
70
0.796
250
3.30
3.7
B781
*
8S1224J000
270
70
0.796
200
5.70
2.8
B781
*
8S1274J000
330
70
0.796
190
6.40
2.7
B781
*
8S1334J000
390
70
0.796
180
7.00
2.4
B781
*
8S1394J000
470
70
0.796
170
7.90
2.2
B781
*
8S1474J000
560
60
0.796
160
8.80
2.0
B781
*
8S1564J000
680
55
0.796
150
10.0
1.9
B781
*
8S1684J000
820
50
0.796
140
12.0
1.6
B781
*
8S1824J000
1000
50
0.252
130
14.0
1.6
B781
*
8S1105J000
1200
50
0.252
115
17.5
1.3
B781
*
8S1125J000
1500
50
0.252
100
23.0
1.25
B781
*
8S1155J000
1800
50
0.252
95
26.0
1.2
B781
*
8S1185J000
2200
40
0.252
80
34.7
1.1
B781
*
8S1225J000
2700
40
0.252
75
40.0
1.0
B781
*
8S1275J000
3300
40
0.252
62
59.5
0.9
B781
*
8S1335J000
3900
40
0.252
59
66.0
0.8
B781
*
8S1395J000
4700
35
0.252
55
78.0
0.7
B781
*
8S1475J000
^
5
11/05
RF chokes
BC series
B78108S
B78148S
Please read the Important notes at the end of
this document.
Impedance |Z |
versus frequency f
measured with impedance analyzer
HP 4191A / HP 4194A
Q factor
versus frequency f
measured with impedance analyzer
HP 4194A
Inductance L
versus DC load current I
DC
measured with LCR meter
HP 4275A
Current derating I
op
/I
R
versus ambient temperature T
A
(rated temperature T
R
= 40
C)
IND0122-K
Z
10
0
10
5
f
10
1
10
2
10
3
10
4
10
5
10
6
1 H
10 H
100 H
Hz
6
10
10
7
10
8
10
9
1000 H
4700 H
|
|
B781*8S
4
10
f
Q
0
IND0124-C
4700 H
1000 H
100 H
10 H
1 H
Hz
10
5
10
6
10
7
10
8
50
100
150
B781*8S
IND0123-X
L
10
10
I
10
10
0
10
1
DC
10
0
10
1
10
2
10
3
10
4
1000 H
100 H
10 H
1 H
4700 H
A
H
_
2
1
_
1
_
B781*8S
IND0552-S-E
0
0
op
I
R
I
T
A
20
40
60
80
100
C 140
0.2
0.4
0.6
0.8
1.0
1.2
6
11/05
RF chokes
BC series
B78108S
B78148S
Please read the Important notes at the end of
this document.
General technical data
Rated inductance L
R
Measuring frequency: L
10
H
=
1 MHz
10
H < L
4700
H = 100 kHz
L > 4700
H
= 10
kHz
Measuring current:
1 mA
Distance between
measuring clamps:
25.4 mm
Q factor Q
min
Measured with HP 4342A
Rated current I
R
Maximum permissible DC current
referred to 40
C ambient temperature,
for derating see below
Inductance decrease
L/L
0
10% (referred to initial value) at I
R
at 20
C ambient temperature
DC resistance R
max
Measured at 20
C ambient temperature,
distance between measuring clamps: 25.4 mm
Resonance frequency f
res, min
Measured with Scalar Network Analyzer ZAS
from Rohde & Schwarz
Climatic category
55/125/56 (55
C/+125
C/56 days damp heat test)
to IEC 60068-1
Solderability
235
C, 2 s,
90% wetting
to IEC 60068-220, test Ta
Resistance to soldering heat
To IEC 60068-2-20, test Tb 260
C, 10 s
Tensile strength of leads
To IEC 60068-2-21, test Ua
20 N
RoHS-compatible
RoHS-compatible is defined as compatible with the follow-
ing documents:
DIRECTIVE 2002/95/EC OF THE EUROPEAN PARLIA-
MENT AND OF THE COUNCIL of 13 February 2003 on the
restriction of the use of certain hazardous substances in
electrical and electronic equipment COM (2004) 606 final
Proposal for a COUNCIL DECISION amending Directive
2002/95/EC of the European Parliament and of the Council
for the purposes of establishing the maximum concentra-
tion values for certain hazardous substances in electrical
and electronic equipment.
Mounting information
When bending the leads, take care that the start-of-winding
areas at the face ends (protected by glue and
lacquer) are not subjected to any mechanical stress.
7
11/05
RF chokes
B78108S
BC series
Please read the Important notes at the end of
this document.
B78148S
Color coding of the inductance value
The inductance value and tolerance are encoded by means of colored bands in accordance with
IEC 60062. The basic unit is
H.
1
st
band 1
st
digit of inductance value
2
nd
band 2
nd
digit of inductance value
3
rd
band multiplier, i.e. the power of ten, by which the first two digits have to be multiplied.
4
th
band tolerance of the inductance value.
Examples:
Color code
1
st
band =
1
st
digit
2
nd
band =
2
nd
digit
3
rd
band =
multiplier
4
th
band =
tolerance
Colorless
--
--
--
20 % (M)
Silver
--
--
10
-2
H =
0.01
H
10 % (K)
Gold
--
--
10
-1
H =
0.1
H
5
%
(J)
Black
--
0
10
0
H =
1
,01
H
--
Brown
1
1
10
1
H =
10
,01
H
Red
2
2
10
2
H =
100
,01
H
2
%
(G)
Orange
3
3
10
3
H =
1000
,01
H
Yellow
4
4
10
4
H = 10000
,01
H
Green
5
5
10
5
H = 100000
,01
H
Special designs
manufactured to
customer specifica-
tions are identified
by a white tolerance
band.
Blue
6
6
Violet
7
7
Grey
8
8
White
9
9
1
st
band
2
nd
band
3
rd
band
4
th
band
Decoding
Yellow
Violet
Gold
Silver
4
7
0.1
H
10 %
= 47
0.1
H
10 % =
4.7
H
10 %
Brown
Green
Red
Gold
1
5
100
,0
H
5 %
= 15
100
,0
H
5 % = 1500
,0
H
5 %
8
11/05
RF chokes
BC series
B78108S
B78148S
Please read the Important notes at the end of
this document.
Taping and packing
Axially taped (to IEC 60286-1)
Radially taped (to IEC 60286-2)
9.2 max.
50.25
11.5 max.
IND0429-B
4 max.
0.8 max.
60.5
651
lacquered/lackiert
(IEC 60294)
3.5 min.
53
50.25
IND0446-L
2 max.
2 max.
160.5
30.5 max.
6 min.
0.5 max.
3.80.7
12.70.3
0.70.2
1.3 max.
1.3 max.
40.2
+1
0.5
18
_
+0.75
0.5
9
_
0.1
5
+0.6
_
4 max.
9.2 max.
(IEC 60294)
11.5 max.
lacquered/lackiert
0.8 max.
insulated
isoliert
9
11/05
RF chokes
B78108S
BC series
Please read the Important notes at the end of
this document.
B78148S
Reel packing
Ammo pack
Packing units
Reel packing
pcs./reel
Ammo pack
pcs./pcs.
Axial 5000
2500
Radial 2000
2500
IND0452-V
Etikett
1
360
_
30.50.15
82+1
90
n
w
Label
30
30
30
Axial
Radial
n (mm)
72 +1
42 +1
w (mm)
84 max.
54 max.
L
H
B
SSB1858-W
Axial
Radial
L (mm)
265 max. 340 max.
B (mm) 75 max. 50 max.
H (mm
125 max. 210 max.
10
11/05
Important notes
The following applies to all products named in this publication:
1. Some parts of this publication contain statements about the suitability of our products for
certain areas of application. These statements are based on our knowledge of typical require-
ments that are often placed on our products in the areas of application concerned. We neverthe-
less expressly point out that such statements cannot be regarded as binding statements
about the suitability of our products for a particular customer application.
As a rule, EPCOS is either unfamiliar with individual customer applications or less familiar with
them than the customers themselves. For these reasons, it is always ultimately incumbent on the
customer to check and decide whether an EPCOS product with the properties described in the
product specification is suitable for use in a particular customer application.
2. We also point out that in individual cases, a malfunction of passive electronic components
or failure before the end of their usual service life cannot be completely ruled out in the
current state of the art, even if they are operated as specified. In customer applications re-
quiring a very high level of operational safety and especially in customer applications in which the
malfunction or failure of a passive electronic component could endanger human life or health
(e.g. in accident prevention or life-saving systems), it must therefore be ensured by means of suit-
able design of the customer application or other action taken by the customer (e.g. installation of
protective circuitry or redundancy) that no injury or damage is sustained by third parties in the
event of malfunction or failure of a passive electronic component.
3. The warnings, cautions and product-specific notes must be observed.
4. In order to satisfy certain technical requirements, some of the products described in this pub-
lication may contain substances subject to restrictions in certain jurisdictions (e.g. be-
cause they are classed as "hazardous"). Useful information on this will be found in our Material
Data Sheets on the Internet (www.epcos.com/material). Should you have any more detailed
questions, please contact our sales offices.
5. We constantly strive to improve our products. Consequently, the products described in this
publication may change from time to time. The same is true of the corresponding product
specifications. Please check therefore to what extent product descriptions and specifications
contained in this publication are still applicable before or when you place an order.
We also reserve the right to discontinue production and delivery of products. Consequent-
ly, we cannot guarantee that all products named in this publication will always be available.
6. Unless otherwise agreed in individual contracts, all orders are subject to the current version
of the "General Terms of Delivery for Products and Services in the Electrical Industry"
published by the German Electrical and Electronics Industry Association (ZVEI).
7. The trade names EPCOS, CeraDiode, CSSP, PhaseCap, PhaseMod, SilverCap, SIFI, SIMID,
SIKOREL, SIOV, SIP5D, SIP5K, TOPcap, UltraCap, WindCap are trademarks registered or
pending in Europe and in other countries. Further information will be found on the Internet at
www.epcos.com/trademarks.
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