sc3-33rfi Welwyn Components, sc3-33rfi Datasheet - Page 2

• Manufacturer Part Number: sc3-33rfi
• Description: High Power Chip Resistors
• Manufacturer: Welwyn Components

High Power
Chip Resistors
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.
Terminations
The wrap-around copper terminations have an electroplated
The wrap-around terminations have an electroplated nickel
nickel barrier and tin-lead solder coating, this ensures
barrier and matte tin finish. This ensures
excellent ‘leach’ resistance properties and solderability.
excellent ‘leach’ resistance properties and solderability.
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Performance Data
Temperature Rise vs Pad Area
Load at rated power:
Overload:
High temperature exposure:
Low temperature operation:
Low temperature storage:
Moisture:
Temperature cycling:
Thermal shock:
Resistance to solder heat:
Shelf life test:
Leach resistance:
1000
100
10
100mm
MIL-PRF-55342
6.25 x rated power for 2 seconds MIL-PRF-55342
2
12 months at room temperature
MIL-STD-202 Method 107 condition B -65˚C +125˚C
molten solder 250˚C
Termination Pad Area (each end)
MIL-STD-883 Method 1010 Test condition B
1000 hours at 70˚C MIL-PRF-55342
1 watt
MIL-STD-202 Method 210
-65˚C, 100 hours
MIL-PRF-55342
MIL-PRF-55342
300mm
2 watt
Bedlington, Northumberland NE22 7AA, UK
2
3 watt
1000mm
R
R
R
R
R
R
R
R%
R
R
2
%
%
%
%
%
%
%
%
%
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.
Pulse Power Rating
100
10
1
0
1 .
90 Seconds min.
Welwyn Components
Typical
Time (sec)
0.25
0
0
0
0
0
0
0
0
2 .
2 .
1
5 .
5 .
5 .
5 .
5 .
1 .
1
5
5
0 .
IA
0
1
0
0 .
85