cement coated surface mount wirewound resistors wa80z series features all welded constructon suitable for automatc pick and place excellent pulse handling capability fuses safely under fault conditons compettve cost performance equivalent to 2, 3 & 5w axial resistors ma ke p ossibl e resistors 07.14 general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc www.ttelectronicsresistors.com all pb-free parts comply with eu directve 2011/65/eu (rohs2) cement coated surface mount wirewound resistors wa80z series www.bitechnologies.com www.irctt.com www.welwyn-tt.com general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc 09. 11 all welded construction suitable for automatic pick and place excellent pulse handling capability fuses safely under fault conditions competitive cost performance equivalent to 2, 3 & 5w axial resistors dimensions (mm) type l w h l wd wa83z 13.40.2 3.6 max 6.25 max 9.0 max 4.50.6 0.8 nom wa84z 18.70.2 5.2 max 6.9 max 14.5 max 6.50.6 0.8 nom wa85z 18.70.2 7.0 max 7.9 max 16.5 max 6.50.6 0.8 nom cement coated surface mount wirewound resistors wa80z series ? all welded construction ? suitable for automatic pick and place ? excellent pulse handling capability ? fuses safely under fault conditions ? competitive cost ? performance equivalent to 2, 3 & 5w axial resistors wa83z wa84z wa85z power rating at 25?c watts 2 3 5 resistance range ohms 0r05 to 900r 0r01 to 2k2 0r015 to 6k8 limiting element voltage volts 50 100 150 isolation voltage volts 250 350 500 tcr ppm/c 1r0:350 >1r0:200 resistance tolerance % <20r: 5, 10 20r: 1, 2, 5, 10 standard values e24 series preferred ambient temperature range c -55 to 155 dimensions (mm) type a b c d wa83z 5.5 2.5 min 10 max 15 min wa84z 7.5 min 2.5 min 15 max 20 min wa85z 7.5 min 2.5 min 15 max 20 min 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 recommended pad sizes issue g 03.06 a subsidiary of tt electronics plc welwyn components d h i l w w construction a high purity ceramic substrate is assembled with interference fit end caps to which are welded the terminations. the resistive element is wound on the substrate and welded to the caps. flameproof silicone cement coating is applied prior to marking with indelible ink and lead forming. d b c a
ma ke p ossibl e cement coated surface mount wirewound resistors wa80z series 07.14 general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc www.ttelectronicsresistors.com cement coated surface mount wirewound resistors wa80z series www.bitechnologies.com www.irctt.com www.welwyn-tt.com general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc 09. 11 ? 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 issue g 03.06 welwyn components marking wa83z and wa84z resistors r10 and above are marked with four colour bands in conformance with iec62. values below r10 are marked with three bands (two digits and tolerance); there is no multiplier band. wa85z resistors are legendmarked ?wa85? plus resistance value and tolerance in conformance with iec62. solvent resistance the body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. flammability the resistor coating will not burn under any condition of applied temperature or component overload. wa80z thermal performance 0 20 40 60 80 100 120 140 160 180 200 220 240 260 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 power (w) temp rise (k) wa83z hot spot wa83z joint wa84z hot spot wa84z joint wa85z hot spot wa85z joint graph 1 performance data temperature rise note: testing was performed on fr4 test boards measuring 50mm x 50mm, with 1oz/ft 2 (300g/m 2 ) copper pads. the track area close to each pad was 120mm 2 . if a lower grade of pcb or less track area is used, derating of the power may be necessary. maximum typical load at rated power: 1000hrs @ 25 or 70c ?r% 5 +0.001? 3 dry heat: 1000hrs @ 200c ?r% 5 +0.001? 3 short term overload ?r% 5 +0.001? 1 derating from rated power @ 25c zero at 155?c climatic ?r% 5 +0.001? 2 climatic category 55/200/56 trc & vibration ?r% 5 +0.001? 1 robustness & solder heat ?r% 5 +0.001? 1 long term damp heat ?r% 5 +0.001? 1 temperature rise see graph 1 pulse handling see graph 2 cement coated surface mount wirewound resistors wa80z series
ma ke p ossibl e cement coated surface mount wirewound resistors wa80z series 07.14 general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc www.ttelectronicsresistors.com cement coated surface mount wirewound resistors wa80z series www.bitechnologies.com www.irctt.com www.welwyn-tt.com general note tt electronics reserves the right to make changes in product specifcation without notice or liability. all information is subject to tt electronics own data and is considered accurate at time of going to print. ? tt electronics plc 09. 11 w a80z energy capability graph 0.1 1 10 100 0.01 0.1 1 10 100 1000 10000 v alue (ohms) energy (joules) w a83z w a84z w a85z graph 2 ? 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 g 03.06 w elwyn components packaging wa80z pr oducts ar e supply on standar d carrier tape and 330mm diameter r eels suitable for automatic pick and place machines. carrier tape dimensions and standar d r eels quantities ar e given below . o r dering p r ocedur e specify type r efer ence, value and tolerance as shown in this example of w a84z at 1.5kohms 5%: pulse handling the graph below shows the energy handling capability of wa80z r esistors for single short pulses (<100ms). for longer pulses of duration up to 5 seconds, up to 5 times the rated power may be applied. note that for ced-air cooling and heatsinking by pcb tracks have no ef fect on energy ratings. if higher energy ratings than those shown ar e needed, it is normally possible to design a pulse withstand variant. f 1% g 2% j 5% k 10% dimensions (mm) quantity t ype ao bo ko w p t per r eel w a83z 5.3 13.9 6.3 24 12 0.4 750 w a84z 7.3 19.2 7.1 32 12 0.4 750 w a85z 7.4 19.2 8.2 32 12 0.4 650 cement coated surface mount w i r ewound resistors w a80z series t ype v alue (use iec 62 code) t olerance (use iec 62 code) w a84z 1k5 j ao k o 24mm / 32mm ? 13mm ? 330mm w p bo all other dimensions as per eia481 standard
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