vitreous enamelled wirewound resistors v700 (rb style) series bs/cecc approved stability for harsh environments overload characteristics ideal for protection circuits high stability and reliability high power dissipation for size impervious lead free vitreous enamel coating approved cecc 40201 - 001 power rating at 25? watts 6.5 3.0 8.0 5.0 power rating at 70? watts 5.6 2.6 6.9 4.3 resistance range ohms 0r1 to 20k 0r1 to 10k 0r1 to 56k 0r15 to 15k limiting element voltage volts 160 63 250 160 tcr ppm/? >20 ohms ?00 20 ohms -50 +250 resistance tolerance % 5 5 5 5 standard values e24 preferred. other values to special order thermal impedance c/watt 44 32 88 36 58 ambient temperature range ? -55 to 200 maximum dimensions (mm) and weight (g) type l max d max f min d max wt. nom v757 (rb57) 22.2 8 30 0.88 2 v758 (rb58) 47 11 30 0.88 9 v759 (rb59) 12.7 5.6 30 0.88 1 v760 (rb60) 36 10.0 30 0.88 4 V761 (rb61) 23 7.0 30 0.88 2 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 87 v757 v758 v759 v760 V761 (rb57) (rb58) (rb59) (rb60) (rb61) power rating at 25? watts 7 11.0 3.0 8.0 5.0 resistance range ohms 0r1 to 20k 0r2 to 82k 0r1 to 10k 0r1 to 56k 0r1 to 15k limiting element voltage volts 200 400 100 250 160 tcr ppm/? typically: +75 maximum +120 resistance tolerance % 5 closer tolerances to special order electrical data physical data issue b ?03.02 a subsidiary of tt electronics plc welwyn components l d f d * see temperature rise in graph application notes construction a high purity ceramic substrate is assembled with force fit end caps to which are welded the termination wires. the resistive element is wound on the substrate and welded to the caps; the vitreous enamel protective coating is then applied.
l f 1 f 2 6 6 10 f 1 ?f 2 1.4 mm terminations material copper clad steel wire, nickel plated and solder-coated. vitreous enamelled wirewound resistors v700 (rb style) 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 88 issue b ?03.02
cecc actual performance 40201-001 maximum typical load at rated power: 1000 hrs ? r% 5 5 3.5 dry heat: 1000 hours at 200? ? r%521 shelf life: 12 mths at room temp ? r% not specified 0.03 0.02 derating from rated power at 25? ? r% not specified see derating curve short term overload ? r% 2 1.5 0.5 climatic ? r% 5 0.5 0.2 climatic category ? r% 55/200/56 55/200/56 55/200/56 long term damp heat ? r% 5 0.05 0.02 temperature rapid change ? r% 1 0.5 0.05 resistance to solder heat ? r% 1 0.25 0.03 vibration ? r% 1 0.25 0.05 noise (?/v in a decade of freqency) not specified zero shock ? r% 1 0.2 0.05 pulse handling data available by request strength the terminations meet requirements of iec 68.2.21. solderability the terminations meet the requirements of iec 115-1, clause 4.17.3.2. performance data 25 70 200 315 116 100 54 0 ambient temperature derating curve % of rated power packaging for rb59 and rb61 the standard method of packaging is taped and ammo packed. for rb57, the standard method of packaging is taped and reeled. rb58 and rb60 are loose packed in boxes. alternative packaging available by request. type v757 v758 v759 v760 V761 (style) (rb57) (rb58) (rb59) (rb60) (rb61) ammo pack 1000 1000 spool 700 box (loose) 25 50 standard quantities per box/spool type l v759 63 v757 73 V761 73 application notes the terminations should not be bent closer than 1.6mm from the body, and the recommended minimum bend radius is 1.2mm. if resistors are to dissipate full rated power, the terminations should not be soldered closer than 4mm from the body. when cold, vitreous enamel has excellent insulation resistance. in common with all insulants the specific resistance of the enamel decreases with increase in temperature. therefore, resistors operated at near maximum temperature cannot be classed as insulated and should not be used in contact with any conducting material. care must be taken when determining clearance distance between the resistor body and the printed circuit board or other components to ensure these are not over heated. resistance is measured 6mm from the body.
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