h l d d 1 w h w d l protective overcoat resistive element copper termination solder plating nickel barrier layer alumina substrate copper wraparound termination lr 1225 lr 1206 / 2010 / 2512 low value flat chip resistor lrc/lrf series standard 2512, 2010 and 1206 sizes resistance values down to 0.003 ohms leach resistant solder-plated copper wrap-around termination low inductance - less than 0.2nh standard eia tape - 1206 = 8mm; 2010 or 2512 = 12mm 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 physical data issue e ?12.04 a subsidiary of tt electronics plc welwyn components 23 LR1206 lr2010 lr2512 power rating at 70? watts 0.5 1.0 1.5/2.0* resistance range ohms 0r010 to 1r 0r003 to 1r 0r003 to 1r dielectric withstanding voltage volts 200 200 200 tcr ppm/? ?00 (contact factory for value below 0.050 ohms) resistance tolerance % r005 5%, >r005 1, 2, 5% temperature rise at rated power ? 40 80 90 pad and trace area for max power rating @ 70? mm 2 30 30 100 *2 watts with total solder pad and trace size of 300 mm 2 dimensions (mm) size l w h (max) d d1 LR1206 3.20?.305 1.63?.203 0.8 0.48?.25 0.48?.25 lr2010 5.23?.38 2.64?.25 0.8 0.48?.25 0.48?.25 lr2512 6.50?.38 3.25?.25 0.8 0.48?.25 0.48?.25 lrc-lrf_e.qxd 12/23/04 10:07 am page 1
low v alue flat chip resistor lrc/lrf series ? w elwyn components limited bedlington, northumberland ne22 7aa, uk t elephone: +44 (0) 1670 822181 facsimile: +44 (0) 1670 829465 email: info@welwyn-tt.com w ebsite: www .welwyn-tt.com issue e 12.04 w elwyn components characteristics t est method performance thermal shock mil-std-202 method 107 0.5% condition b, -65c +125c short t ime mil-prf-55342 0.5% overload high t emperatur e mil-prf-55342 0.5% exposur e t emperatur e mil-std-883 method 1010 0.25% cycling t est condition b moistur e mil-prf-55342 0.5% load life mil-prf-55342 1.0% rated power @ 70c low t emperatur e mil-prf-55342 0.5% operation low t emperatur e -65c, 100 hours 0.5% storage resistance to mil-std-202 method 210 0.25% solder heat leach resistance molten solder 250c 90 seconds minimum lrc 2512 1 w att lrc 2512 2 w att lrc 2010 0.5 watt lrc 2010 1 w att lr c 1206 0.25 w att lr c 1206 0.5 w att dimensions (mm) a b c LR1206 2.0 4.0 1.25 lr2010 3.05 6.5 1.5 lr2512 3.7 7.75 1.5 note: for r esistance values r025 and below part will be supplied as type lrf . components must be mounted with r esistance value marking face up t o ensur e corr ect r esistance value and tolerance. a c b lrc-lrf_e.qxd 12/23/04 10:07 am page 2 25 70 150 (c) 0 20 40 60 80 100 (%) power rating ambient temperature or d e r in g p r o ced u r e ex a m p l e : lrf 2512 a t 1 0 mi lli o h m s (hence f lip -ch i p m o unt ed) and 2% to l e rance o n a reel o f 1800 p i e ce s l r f 2 5 1 2 ? r 0 1 g w t yp e mount i n g c onve n t i ona l ( e l e m e n t up) v a l u e s > r 025 f f l i p - ch i p ( e l e m e n t dow n ) si ze va l ue (u s e iec62 code) t o l e rance (u s e iec62 code) f 1 % g 2 % j 5 % pa cki ng w t ape 1206 o r 2010 3000/ r eel s t anda r d 2512 1800/ r eel t 1 a l l s i z e s 1000/ r eel v a l u e s < r 025
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