SC3 Datasheet, PDF (2/3 Pages) Welwyn Components Limited – High Power Chip Resistors

High Power
Chip Resistors
SC3 Series
Welwyn Components
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 tceorpmpienrateiornmsinhaatvioenasnhealveectaronpelaletcetdronpiclakteeld
bnaicrkrieelrbaanrdriemr atntde tin-fleinaidshs.oTldheisr ecnosautirnegs, this ensures
excellent ‘leach’ resistance properties and solderability.
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.
Performance Data
Load at rated power: 1000 hours at 70˚C MIL-PRF-55342
R%
Overload: 6.25 x rated power for 2 seconds MIL-PRF-55342
R%
High temperature exposure: MIL-PRF-55342
R%
Low temperature operation: MIL-PRF-55342
R%
Low temperature storage: -65˚C, 100 hours
R%
Moisture: MIL-PRF-55342
R%
Temperature cycling: MIL-STD-883 Method 1010 Test condition B R%
Thermal shock: MIL-STD-202 Method 107 condition B -65˚C +125˚C R%
Resistance to solder heat: MIL-STD-202 Method 210
R%
Shelf life test: 12 months at room temperature
R%
Leach resistance: molten solder 250˚C
Typical
1
0.5
0.5
0.5
0.5
0.5
0.25
0.25
0.25
0.1
90 Seconds min.
Temperature Rise vs Pad Area Pulse Power Rating
1000
100
100
10
10
100mm²
300mm²
Termination Pad Area (each end)
1 watt
2 watt
3 watt
1000mm²
1
0.1
1.0
Time (sec)
10.0
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
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