High Power
High
Power
Power
High
Chip Resistors
Chip
Resistors
Resistors
Chip
SC3
SC3 Series
Series
SC3 Series
3 Watts in a 1
size
package*
3 Watts in a 1 Watt
Watt
package*
Watt size size package*
Welwyn Components
Welwyn Components
·
·
·
·
Resistance range
1R0
1R0 to
Resistance range from
1R0
to 10K
Resistance range fromfromto 10K 10K
Tolerances to ±1%
Tolerances to
Tolerances to ±1% ±1%
AEC-Q200 Qualified
AEC-Q200 Qualified
AEC-Q200 Qualified
* Rated
@ 70°C
* Rated Power
Power @ 70˚C
* Rated Power @ 70˚C
Electrical Data
Electrical Data
Characteristic
Characteristic
Power dissipation @70˚ C
Power dissipation @70˚ C
Resistance Range
Resistance Range
LEV
LEV
Ambient temp range
Ambient temp range
Resistance tolerance
Resistance tolerance
TCR
TCR
3 Watts
3 Watts
1R0 to 10K
1R0 to 10K
50V
50V
-55 to +150˚C
-55 to +150˚C
1, 2, 5%
1, 2, 5%
±100ppm/˚C
±100ppm/˚C
Leach-resistant solder-plated
Leach-resistant solder-plated
Termination
Termination
copper wrap-around
copper wrap-around
Pad & trace area for maximum
Pad & trace area for maximum
300mm
2
300mm
2
power rating
power rating
Value
Value
Power Derating Curve
Power Derating Curve
% Of Power Rating
% Of Power Rating
100
80
60
40
20
0
100
80
60
40
20
0
25˚
70˚
70˚
Temperature in
˚
C
Temperature in
˚
C
25˚
150˚
150˚
Physical Data
Physical Data
Top
Top
Bottom
Bottom
(Board Side)
(Board Side)
0.61
±
0.13mm
0.61
±
0.13mm
Recommended
Recommended Layout
Solder Pad
Solder Pad Layout
0.51
±
0.13mm
0.51
±
0.13mm
6.35
±
0.13mm
6.35
±
0.13mm
Plating
Plating
wrap-around
wrap-around
2.29
2.29
±
0.13mm
±
0.13mm
7.6mm
7.6mm
2mm
1mm
0.762
0.7620.127mm
±
±
0.127mmthickness
thickness
2mm
1mm
3.18
±
0.13mm
3.18
±
0.13mm
General Note
General Note
Components reserves the right to make changes in product specification without notice or liability.
Welwyn
Welwyn Components reserves the to Welwyn’s own data and is considered accurate at time of going to print.
All information is subject right to make changes in product specification without notice or liability.
General Note
A subsidiary of
A subsidiary of
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
TT electronics plc
TT electronics reserves the right to make changes in product specification without notice or liability.
TT electronics plc
© Welwyn Components Limited
· Bedlington, Northumberland NE22 7AA, UK
All information is subject to TT electronics’ own data and is considered accurate at time
UK
going to print.
© Welwyn Components Limited
· ·Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
www.irctt.com www.welwyn-tt.com
·
04.10
Bedlington, Northumberland NE22 7AA,
of
www.bitechnologies.com
Issue A 03.02
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Issue A ·
04.10
03.02
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
84
© TT electronics plc
84
11. 11
High Power
High Power
Chip Resistors
Chip Resistors
SC3
Series
SC3
Series
Construction
Resistive thick film material, overglaze and organic protection
are screen printed on a 96% alumina substrate. The
components are laser trimmed to achieve the required
resistance tolerance.
Welwyn Components
Chips can withstand immersion in solder at 250˚C for 90
seconds and are suitable for reflow or wave soldering
mounting applications.
Marking
The body protection and marking are resistant to all normal
industrial cleaning solvents suitable for printed circuits.
Chips are packed and mounted with marking side up.
The SC3 Chips are mounted with the actual resistor element
mounted face down on its termination pads.
Terminations
The wrap-around terminations have an
have an electroplated
copper terminations
electroplated nickel
barrier
barrier and tin-lead solder
ensures
this ensures
nickel
and matte tin finish. This
coating,
excellent ‘leach’ resistance properties
and
solderability.
Performance Data
ref
3
4
6
7
8
14
15
16
18
21
22
AEC-Q200 Table 7
Test
High Temp. Exposure
Temperature Cycling
Moisture Resistance
Biased Humidity
Operational Life (Cyclic Load)
Vibration
Resistance to Soldering Heat
Thermal Shock
Solderability
Board Flex
Terminal Strength
Short Term Overload
Low Temperature Storage
Shelf Life Test
Leach Resistance
Method
MIL-STD-202 Method 108
JESD22 Method JA-104
MIL-STD-202 Method 106
MIL-STD-202 Method 103
MIL-STD-202 Method 108
MIL-STD-202 Method 204
MIL-STD-202 Method 210
MIL-STD-202 Method 107
J-STD-002
AEC-Q200-005
AEC-Q200-006
6.25 x Pr for 2s
-65°C for 100 hours
Room temp for 12 months
Solder dip at 250°C
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
R%
Max.
0.5
0.25
0.5
0.5
1.5
0.25
0.25
0.5
>95% coverage
0.25
0.25
0.5
0.5
0.1
90s minimum
0.05
0.05
Typ.
0.2
0.1
0.2
0.1
0.5
0.05
0.05
0.2
Temperature Rise vs Pad Area
1000
Temperature Rise (˚C)
Pulse Power Rating
100
100
Power (watts)
100mm
2
1 watt
10
10
1
300mm
2
Termination Pad Area (each end)
2 watt
3 watt
1000mm
2
0.1
1.0
Time (sec)
10.0
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
Issue A ·
04.10
03.02
11. 11
High
Power
High
Power
Chip
Resistors
Chip
Resistors
SC3
SC3
Series
Welwyn Components
Packaging
LRF3W Resistors
supplied taped and reeled as
as
IEC 286-3. The standard quantity per reel is
is 1800 parts.
SC3 Resistors are
are supplied taped and reeled
per
per IEC 286-3. The standard quantity per reel
1800 parts.
T
2
D
0
P
2
P
0
T
Marking
(Both sides)
33
±
1.0
13
±
0.5mm
E
13
±
0.5
F
178
±
2
80
±
2
B
0
2.5
±
0.5
0.8
±
0.15
T
1
K
0
A
0
P
1
D
1
Tape dimensions in mm
LRF3W
SC3
W
±0.3
12
P1
±0.1
8
P0
±0.1
4
P2
±0.05
2
D0
±0.1
1.5
D1
±0.2
1.5
E
±0.1
1.75
F
±0.05
5.5
A0
±0.1
3.61
B0
±0.1
6.96
K0
±0.1
1.17
T
±0.05
0.28
T1
nom
0.06
G
Ordering Procedure
Specify type reference etc. as shown in this example of
SC3 at 33
Ω
1% on a reel of 1800 pieces:
Type
Resistance value
(IEC62 code)
Tolerance
(IEC62 code)
F
G
J
1%
2%
5%
SC3
-
33R
F
I
Packing
I
Tape
SC3
1800/reel
Standard
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© Welwyn Components Limited
Bedlington, Northumberland NE22 7AA, UK
Issue A ·
04.10
03.02
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
© TT electronics plc
W
T2
±0.15
1.45
86
11. 11
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