precision metal film resistors pr series low cost precision resistors tolerances down to ?.1% tcr down to 15ppm/? dimensions (mm) & weight (g) pcb min. mounting bend type l max d max f min d nom centres radius wt.nom pr4 6.2 2.5 21 0.6 10.2 0.6 0.3 pr5 9.0 3.6 19.6 0.8 12.7 1.2 0.5 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 pr4 pr5 power rating at 70? watts 0.25 0.5 resistance range ohms 100r ?240k 100r ?1m limiting element voltage volts 250 350 tcr* ppm/? 25 25 resistance tolerance % 0.1, 0.25, 0.5, 1 0.1, 0.25, 0.5, 1 standard values e192 e192 thermal impedance ?/watt 140 112 ambient temperature range ? -55 to 155 electrical data physical data issue c ?04.03 a subsidiary of tt electronics plc welwyn components 182 l d f d *15ppm/? available by request construction the resistance element is a precisely controlled thin film of metal alloy sputtered on to a high purity ceramic core, protected by a moisture-resistant, high dielectric strength coating applied so that terminations remain completely clear. this permits a well defined body length (clean lead to clean lead dimension l). terminations material solder-coated copper wire. strength the terminations meet the requirements of iec 68.2.21 solderability the terminations meet the requirements of iec 115-1, clause 4.17.3.2 marking resistors are colour coded with 5 bands. iec 62 colours are used. solvent resistance the body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. pr_c.qxd 1/5/03 8:58 am page 1
maximum load: 1000 hours at 70c ? 5.0 % r c551 ta orez c07 ta rewop detar morf gnitared short term overload ? 52.0 % r climatic ? 5.0 % r climatic category 55/125/56 long term damp heat ? 5.0 % r temperature rapid change ? 52.0 % r resistance to solder heat ? 52.0 % r vibration and bump ? 1.0 % r g1 > smho ecnatsiser noitalusni nim 004 stlov foorp egatlov pr ecision metal film resistors pr 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 183 issue c 04.03 welwyn components performance data packaging all pr resistors are supplied tape packed ready for loading on to automatic sequencing and insertion machines. component wires will not protrude beyond the outside edge of the tapes. alternative packaging available by request. lead formed resistors can also be supplied. standard options of lancet, radial and goalpost forming are shown in the lead form information section. 52 f 1 f 2 6 6 5 body location f 1 ? f 2 1.4 mm pr_c.qxd 1/5/03 8:58 am page 2 ordering pro ce dure example: p r4 with t cr o f 15p pm/ c a t 10 kilohms and 0. 1% t oleran ce in an ammo pa ck box o f 500 0 pieces - p r 4 y ? 1 0 k b i ty pe tcr y 15 ppm/ c 25 ppm/ c val ue (use iec62 code ) toler an ce (use iec62 co de ) b 0.1% d 0.5% c 0.25% f 1% packi ng i ammo pr4 500 0/ box st and ard pr5 250 0/ box
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