HighPowerChip ResistorsSC3 SeriesWelwyn Components•••3 Watts in a 1 Watt size package*Resistance range from 1 to 200Tolerances to ±1%*Rated Power @ 70˚CElectrical DataCharacteristicPower dissipation @70˚CResistance RangeLEVAmbient temp rangeResistance toleranceTCRTerminationPad & trace area for maximumpower ratingValue3 Watts1.0 to 20050V-55 to +150˚C1, 2, 5%±100ppm/˚CLeach-resistant solder-platedcopper wrap-around300mm2Power Derating Curve100% Of Power Rating806040200 25˚ 70˚ 150˚ Temperature in ˚CPhysical DataTop0.51± 0.13mmBottom(Board Side)0.61± 0.13mmRecommendedSolder Pad LayoutPlatingwrap-around6.35± 0.13mm2.29± 0.13mm7.6mm2mm1mm0.762± 0.127mmthickness3.18± 0.13mmGeneral Note
Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
A subsidiary of TTelectronics plcIssue A · 03.02Issue B · 01.07
© 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
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元器件交易网www.cecb2b.com
HighPowerChip Resistors
SC3 Series
Welwyn Components
ConstructionChips can withstand immersion in solder at 250˚C for 90Resistive thick film material, overglaze and organic protectionseconds and are suitable for reflow or wave solderingare screen printed on a 96% alumina substrate. Themounting applications.components are laser trimmed to achieve the requiredresistance tolerance.MarkingThe body protection and marking are resistant to all normalTerminationsindustrial cleaning solvents suitable for printed circuits.The wrap-around terminations have an electroplated nickel The wrap-around copper terminations have an electroplatedChips are packed and mounted with marking side up.barrier and matte tin finish. This ensures nickel barrier and tin-lead solder coating, this ensuresThe SC3 Chips are mounted with the actual resistor elementexcellent ‘leach’ resistance properties and solderability.mounted face down on its termination pads.Performance DataTypicalLoad at rated power: 1000 hours at 70˚C MIL-PRF-55342R% 1Overload: 6.25 x rated power for 2 seconds MIL-PRF-55342R% 0.5High temperature exposure: MIL-PRF-55342R%0.5Low temperature operation: MIL-PRF-55342R%0.5Low temperature storage: -65˚C, 100 hoursR%0.5Moisture: MIL-PRF-55342R%0.5Temperature cycling: MIL-STD-883 Method 1010 Test condition BR%0.25Thermal shock: MIL-STD-202 Method 107 condition B -65˚C +125˚CR% 0.25Resistance to solder heat:MIL-STD-202 Method 210R%0.25Shelf life test:12 months at room temperatureR%0.1Leach resistance: molten solder 250˚C90 Seconds min.Temperature Rise vs Pad AreaPulse Power Rating1000100)C˚( esiR)s tetru100atwa( rr10eepmwoPTe101100mm2300mm21000mm20.11.010.0Termination Pad Area (each end)Time (sec)1 watt2 watt3 watt© Welwyn Components LimitedBedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0)1670 822181 · Facsimile: +44 (0)1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
Issue B · 01.07
Issue A · 03.0285
元器件交易网www.cecb2b.com
HighPowerChip Resistors
SC3 Series
Welwyn Components
PackagingLRF3W Resistors are supplied taped and reeled as per IEC 286-3. The standard quantity per reel is 1800 parts.SC3 Resistors are supplied taped and reeled as per IEC 286-3. The standard quantity per reel is 1800 parts.T2D0P2P0TMarking(Both sides)33± 1.013± 0.5mmE13± 0.5F178± 280± 2B02.5± 0.50.8± 0.15T1K0A0P1D1Tape dimensions in mmLRF3WSC3W±0.312P1±0.18P0±0.14P2±0.052D0±0.11.5D1±0.21.5E±0.11.75F±0.055.5A0±0.13.61B0±0.16.96K0±0.11.17T±0.050.28T1nom0.06GOrdering ProcedureSpecify type reference etc. as shown in this example of SC3 at 33 1%TypeResistance value(IEC62 code)Tolerance(IEC62 code)FGJ1%2%5%SC3-33RF© Welwyn Components LimitedBedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0)1670 822181 · Facsimile: +44 (0)1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com
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Issue B · 01.07 Issue A · 03.02
WT2±0.151.45
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