Thick Film Low Resistance Kelvin Flip Chip Welwyn Components LRK Series • Precision low resistance applications • Flip chip with Kelvin design • Low temperature coefficient • Resistance to 0.003 ohms • Tolerance down to ±1.0% • 2 watt power dissipation at 70°C Electrical Data LRK Resistance range ohms Tolerance R003-R100 % Operating temperature range to ±1 °C TCR -55 to +150 ppm/°C Power dissipation (at 70°C) watts Temperature rise at 2 watts °C ±100 (down to 0.010) 2.00 70 Physical Data Dimensions (mm) A B S C D E 6.500±0.380 3.250±0.250 1.778 0.740±0.100 0.508±0.127 0.787±0.178 A 1 E 2 SIDE BOTTOM B 3 C 4 D S Recommended Solder Pad Layout Schematic Layout 1 Dimensions (mm) A B C D 2.54 2.413 1.778 1.27 A R C 3 D B 2 4 The LRK low range flip chip resistor series offers very low resistance four terminal (Kelvin) layout for applications requiring low cost and precision current measurement. The LRK flip chip utilises patented, non-noble copper based inks which demonstrate high performance, precision and reliability. 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. A subsidiary of TT electronics plc © Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com Issue B · 03.02 31 Thick Film Low Resistance Kelvin Flip Chip Welwyn Components LRK Series Performance Data Test Test Method Thermal shock Typical Performance MIL-STD-202, method 107D -55 to 125°C, 5 cycles 30 Min ±0.5% MIL-PRF-55342 ±0.5% Short time overload High temperature exposure MIL-PRF-55342 100 hours at 125°C ±0.5% Temperature cycling MIL-STD-833, method 1010 test condition B ±0.25% Moisture resistance MIL-STD-202, method 106E ±0.5% Load life MIL-STD-202, method 108 rated power 1000 hours at 70°C ±1.0% MIL-PRF-55342 ±0.5% Low temperature operation Derating Curve Packaging Resistors are supplied taped and reeled. Rated Power (%) 120 100 80 60 40 20 0 30 50 70 90 110 130 150 Ambient Temperature (oC) © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com 32 Issue B · 03.02