BCcomponents
DATA SHEET
RMW03/05/07/10/15/20
RMF03/05/07/10
Radial mounted power resistors
Product specification
Supersedes data of 15th March 2001
File under BCcomponents, BC08
2002 Jul 29
FEATURES
•
High power dissipation in small volume
•
Low solder spot temperature
•
Very stable mounting
•
Fire-proof inorganic construction.
•
Specially designed for inrush current limitation
of line connected power supplies, as the input
stage of television power supplies and
wherever a save fuse feature is required in case
of a short circuit fault; see Fig.1.
DESCRIPTION
RMW/RMF:
The mounting terminations are
crimped to the resistive body to assure a good
mechanical and electrical contact.
The resistor body and lead ends are housed
within a rectangular ceramic case which is
non-flammable, will not melt even at high
overloads and is resistant to most commonly used
cleaning solvents, in accordance with
“IEC 60068-2-45”.
RMWL/RMFL:
With stainless steel terminations,
available on request.
2002 Jul 29
2
BCcomponents
Radial mounted power resistors
APPLICATIONS
•
These resistors have been designed to dissipate
high powers in a small volume, to be used in
applications where low solder spot
temperature and very stable mounting are
essential
RMW:
The resistor element is a resistive wire
which is wound in a single layer on a fibre glass
core.
RMF:
The resistor element is a metal film resistor
consisting of a metal layer deposited over a high
grade ceramic rod. The resistive film is adjusted
to final value by means of a helical groove.
QUICK REFERENCE DATA
DESCRIPTION
Resistance tolerance, type and
range (E24 series):
VALUE
RMW03
RMF03
RMW05
RMF05
RMW07
RMF07
RMW10
RMF10
RMW15
RMW20
±
10%
±
5%
Maximum permissible body
temperature
Rated dissipation at T
amb
= 70
°
C
Climatic category (IEC 60068)
Basic specification
Stability after:
load, 1000 hours
climatic tests
short time overload
Insulation voltage
0.22 to
1.5
Ω
1.6
Ω
to
3.9 k
Ω
−
100
Ω
to
39 k
Ω
0.47 to
1.5
Ω
1.6
Ω
to
4.7 k
Ω
−
100
Ω
to
51 k
Ω
0.47 to
1.5
Ω
1.6
Ω
to
7.5 k
Ω
1 k to
100 k
Ω
0.47 to
1.5
Ω
1.6
Ω
to
10 k
Ω
1 k to
150 k
Ω
1.0 to
2.0
Ω
2.2
Ω
to
10 k
Ω
1.5 to
3.0
Ω
3.3
Ω
to
15 k
Ω
RMW03/05/07/10/15/20
RMF03/05/07/10
−
−
275
°
C
3W
5W
7W
25/155/56
IEC 60115-1
10 W
15 W
20 W
Product specification
∆
R/R max.:
±
5% + 0.1
Ω
∆
R/R max.:
±
1% + 0.1
Ω
∆
R/R max.:
±
2% + 0.1
Ω
>
2000 V
BCcomponents
Product specification
Radial mounted power resistors
RMW03/05/07/10/15/20
RMF03/05/07/10
LOAD
(SMPS)
F
LINE
FILTER
RMW-LS
C
JW25
Fig.1 Typical application circuit.
ORDERING INFORMATION
Table 1
Ordering code indicating resistor type; style and length of termination
ORDERING CODE 2306 25. .....
TYPE
lead length
10 mm
RMW03
RMF03
RMW05
RMF05
RMW07
RMF07
RMW10
RMF10
RMW15
RMW20
0 11...
6 11...
1 11...
7 11...
2 11...
8 11...
3 11...
9 11...
TERMINATION STYLE 1
lead length lead length
25 mm
15 mm
0 12...
6 12...
1 12...
7 12...
2 12...
8 12...
3 12...
9 12...
lead length
30 mm
TERMINATION STYLE 2
lead length
10 mm
0 21...
6 21...
1 21...
7 21...
2 21...
8 21...
3 21...
9 21...
lead length
25 mm
0 22...
6 22...
1 22...
7 22...
2 22...
8 22...
3 22...
9 22...
lead length
30 mm
PACKAGING
LOOSE IN BOX
(units per box)
500
500
500
500
500
500
400
400
50
50
−
−
−
−
−
−
−
−
4 11...
5 11...
Table 2
−
−
−
−
−
−
−
−
4 12...
5 12...
−
−
−
−
−
−
−
−
4 22...
5 22...
−
−
−
−
−
−
−
−
Ordering code (12NC)
Last digit of 12NC
LAST DIGIT
7
8
9
1
2
3
4
O
RDERING EXAMPLE
The ordering code of an RMW03
resistor, value 47
Ω
, with standard
terminations, style 1 and length
10 mm, supplied loose in box of
500 units is: 2306 250 11479.
•
The resistors have a 12-digit
ordering code starting with
2306 25
•
The subsequent 3 digits indicate the
resistor type, termination style and
length; see Table 1.
•
The remaining 3 digits indicate the
resistance value:
– The first 2 digits indicate the
resistance value.
– The last digit indicates the
resistance decade in accordance
with Table 2.
RESISTANCE
DECADE
0.22 to 0.91
Ω
1 to 9.1
Ω
10 to 91
Ω
100 to 910
Ω
1 to 9.1 k
Ω
10 to 91 k
Ω
100 to 150 k
Ω
2002 Jul 29
3
BCcomponents
Product specification
Radial mounted power resistors
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the
E24 series for resistors with a tolerance of
±
5% or
±
10%. The
values of the E24 series are in accordance with
“IEC publication 60063”.
Limiting values
TYPE
RMW03
RMF03
RMW05
RMF05
RMW07
RMF07
RMW10
RMF10
RMW15
RMW20
Note
1. The maximum voltage that may be continuously
applied to the resistor element, see
“IEC publication 60266”.
Application information
V
=
V
=
V
=
V
=
V
=
LIMITING VOLTAGE
(1)
(V)
V
=
P
n
×
R
750
P
n
×
R
1000
P
n
×
R
1200
P
n
×
R
1500
P
n
×
R
P
n
×
R
15
20
Fig.2
10
7
5
LIMITING POWER
(W)
3
RMW03/05/07/10/15/20
RMF03/05/07/10
The maximum permissible hot-spot temperature is 275
°
C,
and the minimum breakdown voltage of the
encapsulation is 2000 V.
P
ULSE LOADING CAPABILITY
Detailed pulse loading information is available on request.
D
ERATING
The power that the resistor can dissipate depends on the
operating temperature; see Fig.2.
P
max
(%P
rated
)
100
CCA096
50
0
−25
0
50 70
100
155
T
amb
(
o
C)
Maximum dissipation (P
max
) in percentage
of rated power as a function of the ambient
temperature (T
amb
).
STYLE 1
STYLE 2
M
OUNTING
The resistors must be mounted in such a way that no stress
is exerted on the leads and that thermal expansion is
possible over the temperature range.
Ensure that the
temperature rise of the resistor body by conducted or
convected heat, does not affect nearby components or
materials.
The temperature rise at the soldering point of the
leads must not reach the melting point of the solder. The
temperature rise at the soldering point and the hot-spot as a
function of dissipated power for the various types, are
shown in Figs 4 to 13.
measuring point
CCA097
Fig.3
Measuring point of the solder
spot temperature.
2002 Jul 29
4
BCcomponents
Product specification
Radial mounted power resistors
RMW03/05/07/10/15/20
RMF03/05/07/10
T
EMPERATURE RISE OF SOLDER SPOT AND HOT
-
SPOT AS A FUNCTION OF LOAD AND LEAD LENGTH FOR STYLE
1
CCA100
CCA101
150
∆T
(K)
120
10 W
90
7W
5W
3W
150
∆T
(K)
120
90
10 W
7W
5W
3W
60
60
30
30
0
0
20
40
60
80
100
120
P
nom
(%)
140
0
0
20
40
60
80
100
120
140
P
nom
(%)
Termination length: 10 mm.
Termination length: 25 mm.
Fig.4
Solder spot temperature rise (
∆
T) as a
function of dissipated power.
Fig.5
Solder spot temperature rise (
∆
T) as a
function of dissipated power.
CCA102
CCA102
250
∆T
(K)
200
10 W
7W
250
∆T
(K)
200
10 W
7W
5W
150
3W
100
100
150
5W
3W
50
50
0
0
20
40
60
80
100
120
140
P
nom
(%)
0
0
20
40
60
80
100
120
140
P
nom
(%)
Termination length: 10 mm.
Termination length: 25 mm.
Fig.6
Hot-spot temperature rise (
∆
T) as a
function of dissipated power.
5
Fig.7
Hot-spot temperature rise (
∆
T) as a
function of dissipated power.
2002 Jul 29
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