BCcomponents
DATA SHEET
SMW02/03/05
SMF02/03/05
Stand-up miniature power resistors
Product specification
Supersedes data of 7th August 2000
File under BCcomponents, BC08
2001 Mar 15
BCcomponents
Product specification
Stand-up miniature power resistors
FEATURES
DESCRIPTION
SMW:
The resistor element is a
resistive wire which is wound in a
single layer on a ceramic rod. Metal
caps are pressed over the ends of the
rod. The ends of the resistance wire
and the leads are connected to the
caps by welding.
SMF:
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. The leads are connected to the
caps by welding.
SMW02/03/05
SMF02/03/05
SMW/SMF:
Tinned copper-clad iron
leads with poor heat conductivity are
employed permitting the use of
relatively short leads to obtain stable
mounting without overheating the
solder joint.
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
“MIL-STD-202E, method 215”
and
“IEC 60068-2-45”.
•
High power dissipation in small
volume
•
High pulse load handling
capabilities
•
2e pitch mounting
•
Designed in stand-up configuration
for stand-up mounting.
APPLICATIONS
•
Ballast switching
•
Power supplies
•
Shunts.
QUICK REFERENCE DATA
DESCRIPTION
Resistance range; note
1
Resistance tolerance
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
Note
VALUE
SMW02
0.1 to
200
Ω
SMF02
220
Ω
to
47 k
Ω
SMW03
0.1 to
560
Ω
SMF03
620
Ω
to
47 k
Ω
SMW05
0.1 to
560
Ω
SMF05
620
Ω
to
47 k
Ω
±
5%; E24 series
300
°
C
2W
3W
40/200/56
IEC 60115-1
5W
∆
R/R max.:
±
5% + 0.1
Ω
∆
R/R max.:
±
3% + 0.1
Ω
∆
R/R max.:
±
2% + 0.1
Ω
>
2000 V
1. Higher values are available on request.
2001 Mar 15
2
BCcomponents
Product specification
Stand-up miniature power resistors
ORDERING INFORMATION
Table 1
Ordering code indicating resistor type and packaging
SMW02/03/05
SMF02/03/05
ORDERING CODE 2306 34. .....
TYPE
LOOSE IN BOX
500 units
SMW02
SMF02
SMW03
SMF03
SMW05
SMF05
0 03...
5 03...
1 03...
6 03...
2 03...
7 03...
Ordering code (12NC)
Table 2
Last digit of 12NC
LAST DIGIT
7
8
9
1
2
3
O
RDERING EXAMPLE
The ordering code of a SMW02
resistor, value 47
Ω
, supplied loose in
box of 500 units is: 2306 340 03479.
•
The resistors have a 12-digit
ordering code starting with 2306 34
•
The subsequent 3 digits indicate the
resistor type and packaging;
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
0.1 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 47 k
Ω
2001 Mar 15
3
BCcomponents
Product specification
Stand-up miniature power resistors
FUNCTIONAL DESCRIPTION
Product characterization
Standard values of nominal resistance are taken from the
E24 series for resistors with a tolerance of
±
5%.
The values of the E24 series are in accordance with
“IEC publication 60063”.
Limiting values
TYPE
SMW02
SMF02
SMW03
SMF03
SMW05
SMF05
Note
1. The maximum voltage that may be continuously
applied to the resistor element, see
“IEC publication 60266”.
160
SMW02/03/05
SMF02/03/05
The maximum permissible hot-spot temperature is 300
°
C,
and the minimum breakdown voltage of the
encapsulation is 2000 V.
P
ULSE LOADING CAPABILITY
Detailed pulse loading information is available on request.
Application information
LIMITING POWER
(W)
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 as a function of
dissipated power is shown in
Fig.2.
LIMITING VOLTAGE
(1)
(V)
V
=
P
n
×
R
350
V
=
P
n
×
R
350
V
=
P
n
×
R
600
3
5
MBG543
D
ERATING
The power that the resistor can dissipate depends on the
operating temperature; see
Fig.1.
∆T
(K)
120
5W
3W
80
Pmax
(%Prated )
100
2W
MBG629
40
50
0
0
40
80
%Pnom
120
0
40
0
50
70
100
150
200
o
Tamb ( C)
Fig.1
Maximum dissipation (P
max
) as a function of
the ambient temperature (T
amb
).
Fig.2
Solder spot temperature rise (
∆
T) as a
function of dissipated power.
2001 Mar 15
4
BCcomponents
Product specification
Stand-up miniature power resistors
MECHANICAL DATA
Mass per 100 units
TYPE
SMW02
SMF02
SMW03
SMF03
SMW05
SMF05
Marking
The resistor is marked with the resistor type designation, the
production week, nominal resistance value, the tolerance
on the resistance and the rated dissipation at T
amb
= 70
°
C.
For values up to 910
Ω
the R is used as a decimal point. For
values of 1 k
Ω
or greater the letter K is used as the decimal
point for the k
Ω
indication.
MASS
(g)
370
530
640
L
W
SMW02/03/05
SMF02/03/05
Outlines
D
H
C
∅d
P
CCB358
B
1
B
2
For dimensions see Table
3.
Fig.3 Outlines.
Table 3
Resistor type and relevant physical dimensions; see
Fig.3
W
(mm)
11
±
1
12
±
1
13
±
1
D
(mm)
7
±
1
8
±
1
9
±
1
C
(mm)
0/+1.0
0/+1.0
0/+1.0
H
(mm)
20.5
±
1.5
25.0
±
1.5
25.5
±
1.5
TYPE
SMW02
SMF02
SMW03
SMF03
SMW05
SMF05
∉
1
−
B
2
∉
B
(mm)
+0.9/
−
0.3
+1.4/
−
0.3
+2.3/
−
0.3
L
(mm)
P
(mm)
∅
d
(mm)
4.5
±
1.5
5
±
1
0.8
±
0.03
2001 Mar 15
5
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