ultra precision metal film resistors CAR series tolerance down to 0.01% low tcr s high reliability superior moisture performance non standard values available highest stability metal film available matched sets and networks tolerance tcr CAR5 CAR6 CAR7 ppm/? 0.01-0.02% 0.05% 0.1-1% 0.01/0.02% 0.05% 0.1-1% 0.01-0.02% 0.05% 0.1-1% 5 50 to 300k 10 to 500k 10 to 500k 50 to 500k 10 to 500k 10 to 500k 50 to 750k 10 to 750k 10 to 750k 10 50 to 300k 10 to 1m 10 to 1m 50 to 500k 10 to 1m 10 to 1m 50 to 750k 10 to 1m 10 to 1.5m 15 50 to 300k 10 to 1m 10 to 1m 50 to 500k 10 to 1m 10 to 1m 50 to 750k 10 to 1m 10 to 3.5m 25 50 to 300k 10 to 1m 10 to 1.5m 50 to 500k 10 to 1m 10 to 3m 50 to 750k 10 to 1m 10 to 5m 50 50 to 300k 10 to 1m 10 to 3m 50 to 500k 10 to 1m 10 to 5m 50 to 750k 10 to 1m 10 to 10m dimensions (mm) and weight (g) pcb min mounting bend wt. type l max d max f min d nom. centres radius nom. CAR5 7.2 2.5 30 0.6 10.2 0.6 0.24 CAR6 10.0 3.7 30 0.6 12.7 0.6 0.40 CAR7 15.5 5.5 30 0.8 18.4 1.2 1.15 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 CAR5 CAR6 CAR7 notes power rating at 70? watts 0.25 0.33 0.5 power rating at 85? watts 0.125 0.25 0.33 resistance range ohms 10r0 to 3m 10r0 to 5m 10r0 to 10m limiting element voltage volts 250 350 500 tcr (20 to +70?) ppm/? 5(v), 10(t), 15(y), 25(d), 50(c) see tolerance/tcr resistance tolerance % 0.01(l), 0.02(p), 0.05(w), 0.1(b), 0.25(c), 0.5(d) & 1(f) combinations standard values e24, e96 preferred below thermal impedance ?/watt 110 70 60 ambient temperature range ? -55 to +155 electrical data table of resistance restrictions physical data issue b ?03.02 a subsidiary of tt electronics plc welwyn components 178 l d f d
figure 1 construction ceramic rods are coated with a metal film and plated steel caps are force fitted. a helical cut is used to adjust the film to its final value. termination wires are welded to the caps and the resistor is protected with a specially formulated epoxy coating. 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 ultra precision metal film resistors CAR 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 179 issue b ?03.02 welwyn components values 10 250k values > 250k actual performance actual performance maximum typical maximum typical load at rated power : 1000 hrs at 70? (or 85?) ? r % 0.05 0.02 0.25 0.05 dry heat : 1000 hrs at 155? ? r % 0.15 0.08 1 0.2 shelf life : 12 months at room temperature ? r % 0.01 0.003 0.04 0.02 derating from rated power at 70? (or 85?) zero at 155? zero at 155? short term overload ? r % 0.01 0.001 0.08 0.01 climatic ? r % 0.05 0.02 0.2 0.05 climatic category 55/155/56 55/155/56 long term damp heat ? r % 0.05 0.02 0.2 0.05 temperature rapid change ? r % 0.04 0.02 0.25 0.05 resistance to solder heat ? r % 0.02 0.003 0.05 0.005 vibration and bump ? r % 0.02 0.002 0.06 0.02 noise (in a decade of frequency) ?/v 0.2 0.03 1 0.1 voltage coefficient of resistance ppm/v 0.3 <0.05 0.2 <0.05 marking type reference, tcr code, resistance value and tolerance code. the resistance value marking conforms to iec 62. solvent resistance the body protection and marking are resistant to all normal industrial cleaning fluids suitable for printed circuits. performance data application notes resistors can be supplied matched for tolerance and tcr down to ?.005% and ?ppm/?, respectively, either as separate resistors or pre-assembled and encapsulated within a plastic box. the individual resistors within a set or module can be manufactured with a tolerance of ?.01% and a tcr of ?ppm/?. 52 f 1 f 2 6 6 5 body location f 1 ?f 2 1.4 mm packaging CAR5 and CAR6 resistors are supplied taped (on reel or in ammo pack) or loose packed. CAR7 resistors are supplied loose packed. type CAR5 CAR6 CAR7 small box 250 125 25 large box 1000 500 250 reel 5000 2500 - ammo pack 1000 1000 - standard quantities per pack
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