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LRF3W Datasheet(PDF) 2 Page - Welwyn Components Limited |
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LRF3W Datasheet(HTML) 2 Page - Welwyn Components Limited |
2 / 3 page Low Value 3W Chip Resistors LRF3W 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 D · 07.06 Welwyn Components 85 Typical Load at rated power: 1000 hours at 70°C MIL-PRF-55342 ∆R% 1 Overload: 6.25 x rated power for 2 seconds MIL-PRF-55342 ∆R% 0.5 High temperature exposure: MIL-PRF-55342 ∆R% 0.5 Low temperature operation: MIL-PRF-55342 ∆R% 0.5 Low temperature storage: -65°C, 100 hours ∆R% 0.5 Moisture: MIL-PRF-55342 ∆R% 0.5 Temperature cycling: MIL-STD-883 Method 1010 Test condition B ∆R% 0.25 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 ∆R% 0.25 Shelf life test: 12 months at room temperature ∆R% 0.1 Leach resistance: molten solder 250°C 90 Seconds min. Performance Data Construction Patented non-noble copper based 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 terminations have an electroplated nickel barrier and matte tin finish, 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 LRF3W Chips are mounted with the actual resistor element mounted face down on its termination pads. 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 P1 P0 P2 D0 D1 E F A0 B0 K0 T T1 T2 ±0.3 ±0.1 ±0.1 ±0.05 ±0.1 ±0.2 ±0.1 ±0.05 ±0.1 ±0.1 ±0.1 ±0.05 nom ±0.15 LRF3W 12 8 4 2 1.5 1.5 1.75 5.5 3.61 6.96 1.17 0.28 0.06 1.45 2.5 ± 0.5 13 ± 0.5 33 ± 1.0 Marking (Both sides) 0.8 ± 0.15 13 ± 0.5mm P1 A0 D1 D0 P0 P2 T2 T1 K0 T |
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