characteristic value power dissipation @70? 3 watts resistance range 0.005 to 0.100 ? dielectric withstand 200v ambient temp range -55 to +150? resistance tolerance r005 5%, >r005 2, 5%, r01 1, 2, 5% tcr ?00ppm/? pad & trace area for maximum power rating* 300mm 2 low value 3w chip resistors lrf3w series 3 watts @ 70? resistance range from 0.003 to 0.1 ? tolerances to ?% 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 d ?07.06 a subsidiary of tt electronics plc welwyn components 84 0.51 0.13mm 6.35 0.13mm 3.18 0.13mm 0.94 mm max thickness plating wrap-around 0.81 0.13mm 2.29 0.13mm 7.6mm 2mm 1mm physical data 100 80 60 40 20 0 25 70 150 temperature in c % of power rating to p bottom (board side) recommended solder pad layout weight 0.065g typ.
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? 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?, 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? +125? ? 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? 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 ?each resistance properties and solderability. chips can withstand immersion in solder at 250? 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 ?.3 ?.1 ?.1 ?.05 ?.1 ?.2 ?.1 ?.05 ?.1 ?.1 ?.1 ?.05 nom ?.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 80 2 178 2 13 0.5mm p 1 a 0 b 0 d 1 d 0 p 0 p 2 gf w e t 2 t 1 k 0 t
type lrf3w r005 g resistance value (iec62 code) tolerance (iec62 code) 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 86 f1% g2% j5% ordering procedure specify type reference, value and tolerance as shown in this example of lrf3w 5m ? 2%:
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