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  g eneral purpo se surfac e m ounted resistors w cr s e rie s s excellent r eliability s wide range of sizes and ohmic values s w rap ar ound terminations s inner electr ode pr otection general note w elwyn components r eserves the right to make changes in pr oduct specification without notice or liability . all information is subject to w elwyn? s own data and is consider ed accurate at time of going to print. ? 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 iss 07.03 a subsidiary of tt electr onics plc w elwyn components * notes ? tcr for low values 1r to 10r: -400 to +600ppm/oc, 11r to 100r: 200ppm/oc tcr for high values 3m3 to 10m: 300ppm/o 1 200 25 50 power rating @ 70?c watts resistance range ohms limiting element votage volts tcr* ppm/?c resistance t olerance % zer o-ohm jumper chip rating amps 0.05 0201 10r to 1m0 0.5 0.25 1210 1r0 to 10m 0.063 0402 <50 1.5 2 0.1 0603 0.125 0805 150 0.25 1206 0.5 2010 1.0 2512 e24 or e96 -55 to 125 standar d values ambient temperatur e range ?c zer o-ohm jumper chip resistance milliohms 1 250 100 200 electrical data w 0.3 0.03 0.5 0.03 0.8 0.15 1.25+ 0.2 -0.1 1.6 + 0.1 -0.15 2.6 0.15 2.5 0.15 3.2 0.15 l 0.6 0.03 1.0 0.05 1.6 0.15 2.0 0.2 3.2 +0.1 -0.25 3.2 + 0.1 -0.2 5.0 0.15 6.3 0.15 t 0.23 0.03 0.35 0.05 0.5 0.15 0.5 + 0.15 -0.10 0.55 +0.15 -0.1 0.55 +0.15 -0.1 0.56 0.15 0.56 0.15 c 0.12 0.05 0.2 0.1 0.25 0.2 0.4 0.2 0.5 + 0.2-0.25 0.5 0.25 0.60 0.25 0.60 0.25 a 0.15 0.05 0.25 0.1 0.25 0.2 0.4 0.2 0.5+ 0.2 -0.25 0.5 0.2 0.60 0.25 0.60 0.25 t w a a l w rap-around terminations (3 faces) c s tyle 0201 0402 0603 0805 1206 1210 2010 2512 dimensions (mm) physical data construction the chips have a high alumina substrate (96% minimum) with a ruthenium oxide r esistance element and silver palladium, nickel and tin plated terminations. a glazed pr otection coat is applied to the r esistive element (see fig. 1) t erminations solderability the terminations meet the r equir ements of iec 115-1, clause 4.17.3.2. str ength the terminations meet r equir ements of iec 68.2.21. figur e 1 tin plating nickel barrier dipped conductor silver palladium 96% min alumina substrate epoxy melamine glass dielectric resistance element protection
g e n e r al p urpose s urface m o unted r e sistors wcr s e rie s ? 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 d 07.03 w elwyn components marking all r esistors ar e individually marked with 3 digits. the first two digits ar e the significant figur es and the thir d defines the number of added zer os. jumpers ar e marked 000. t ypes 0201 and 0402 have no marking. e96 1% components that can not be marked with 4 digits will be marked with a standar d 3 digit code. details can be supplied upon r equest. solvent resistance the pr otective epoxy lacquer and marking ar e r esistant to all normal industrial cleaning fluids suitable for printed cir cuits. t able 1 packaging all chips ar e tape mounted and supplied on standar d 8mm tape r eel, as iec publication 286-3. 180mm (7 inch) r eel is st a ndar d carries 5,000 pieces. (except 0402 carries 10,000 pieces) chip resistor labstock for designers wcr chip r esistors ar e available in a special package of the most popular sizes containing 50 each of the e24 values. please contact the sales desk for full details of this excellent e s i o n e c n a t s i s e r b d s m h o e u l a v 0 1 - r 0 0 1 >100r, 0 k 0 1 >10k, 5 1 + k 0 0 1 >100k, 0 2 + 0 m 1 0 3 + 0 m 1 > packaging all chips ar e tape mounted and supplied on standar d 8mm tape r eel, as iec publication 286-3. 180mm (7 inch) r eel is st a ndar d 250mm (10 inch) r eel carrying double the standard quantity can be supplied by agreement. chip resistor labstock for designers wcr chip r esistors ar e available in a special package of the most popular sizes containing 50 each of the e24 values. please contact the sales desk for full details of this excellent solution for designers and your pr ototype build r equir ements. 02.09 performance data load: 1000 hrs at 70c 10r-100k : 1 >100k : 2 shelf life: 12 months at room temp. 0.2 0201 0402 0603 0805 maximum change 1206 1210 2010 2512 2 2 2.5 2.5 2.5 2.5 2.5 5 3 3 3 3 3 3 3 3 1 1 1 1 1 1 1 1 1 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 1 1 1 1 1 1 1 1 50 100 100 500 200 400 400 400 400 100 500 500 500 500 500 0.2 0.2 zero @ 125 c 55/125/56 see table 1 > 1g 0.2 0.2 0.2 0.2 0.2 r% r% r% r% r% r% derate linearly to zero from 70c short term overload (6.25 x rated power) max voltage climatic climatic catagory long term damp heat temperature rapid change resistance to solder heat vibration and bump noise ohms volts insulation resistance voltage proof volts r% r% 4r7-100k : 1 >100k : 2 1r-100k : 1 >100k : 2 1r-100k : 1 >100k : 2 1r-100k : 1 >100k : 2 1r-100k : 1 >100k : 2 1r-100k : 1 >100k : 2 3% + 0.1r note: for zero ohm jumper chips use the dummy value & tolerance code r005j


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