SC3 WELWYN | Alldatasheet
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Power dissipation @70˚ C 3 Watts 002 ot 0.1egnaR ecnatsiseR V05VEL Ambient temp range -55 to +150˚C %5 ,2 ,1ecnarelot ecnatsiseR TCR ±100ppm/˚C Termination Leach-resistant solder-plated copper wrap-around Pad & trace area for maximum power rating 300mm2 High Power Chip Resistors SC3 Series
- 3 Watts in a 1 Watt size package*
- Resistance range from 1 to 200
- Tolerances to ±1% * Rated Power @ 70˚C General 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. © 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 Electrical Data Power Derating Curve Issue A · 03.02 A subsidiary of TT electronics plc Welwyn Components 0.51 ± 0.13mm 6.35 ± 0.13mm 3.18 ± 0.13mm 0.762 ± 0.127mm thickness Plating wrap-around 0.61 ± 0.13mm 2.29 ± 0.13mm 7.6mm 2mm 1mm Physical Data 100 25˚ 70˚ 150˚ Temperature in ˚C % Of Power Rating Top Bottom (Board Side) Recommended Solder Pad Layout Issue 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 Issue A · 03.02 Welwyn Components Typical Load at rated power: 1000 hours at 70˚C MIL-PRF-55342 1 %R Overload: 6.25 x rated power for 2 seconds MIL-PRF-55342 5.0 %R High temperature exposure: MIL-PRF-55342 5.0%R Low temperature operation: MIL-PRF-55342 5.0%R Low temperature storage: -65˚C, 100 hours 5.0%R Moisture: MIL-PRF-55342 5.0%R Temperature cycling: MIL-STD-883 Method 1010 Test condition B 52.0%R Thermal shock: MIL-STD-202 Method 107 condition B -65˚C +125˚C R% 0.25 Resistance to solder heat: MIL-STD-202 Method 210 52.0%R Shelf life test: 12 months at room temperature 1.0%R Leach resistance: molten solder 250˚C 90 Seconds min. Performance Data Temperature Rise vs Pad Area 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 nickel barrier and tin-lead solder coating, 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. 1000 100 100mm2 300mm2 1000mm2 Termination Pad Area (each end) Temperature Rise (˚C) 1 watt 2 watt 3 watt Pulse Power Rating 100 0.010.11.0 Time (sec) Power (watts) The wrap-around terminations have an electroplated nickel barrier and matte tin finish. This ensures excellent ‘leach’ resistance properties and solderability. Issue B · 01.07
(IEC62 code) Tolerance (IEC62 code) High Power Chip Resistors SC3 Series © 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 Issue A · 03.02 Welwyn Components Packaging LRF3W Resistors are supplied taped and reeled as per IEC 286-3. The standard quantity per reel is 1800 parts. Tape dimensions in mm W P 1 P 0 P 2 D 0 D 1 E F A 0 B 0 K 0 T T1 T2 F 1% G 2% J 5% Ordering Procedure Specify type reference etc. as shown in this example of 2.5 ± 0.5 13 ± 0.5 33 ± 1.0Marking (Both sides) 0.8 ± 0.15 80 ± 2 178 ± 2 13 ± 0.5mm G F W E T SC3 Resistors are supplied taped and reeled as per IEC 286-3. The standard quantity per reel is 1800 parts. SC3 SC3 at 33 1% Issue B · 01.07