Resistors Compact Flameproof Power Compact Flameproof Power Wirewound Resistors Welwyn Components Wirewound Resistors WP-S Series Small size for power rating WP-S Series Enhanced pulse handling capability Small size for power rating Flameproof protection Enhan ced pulse handling capability Flameproof protection SMD Z-form available Surface mount ZI-form option RoHS compliant with Pb-free terminations RoHS compliant with Pb-free terminations AllAll Pb-Pb-frfreeee partsparts ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amended amended b yb y(EU) (EU) 2015/863 2015/863 (R (RoHS3)oHS3) Electrical Data WP1S WP2S / WPP2RWP2S WP25S WP3S WP4S WP5S Power rating at 25 C watt s 1 2 2.5 3 4 5 5s overload rating at 25C watts 5 10 12.5 15 20 25 Short pulse performance See Pulse Performance graphs Resistance range ohms R068 to 430R R05 to 900R R05 to 900R R01 to 2K2 R01 to 10K R015 to 6K8 Limiting element voltage volts 50 50 75 100 100 150 TCR ppm/ C <1R: 350 1R: 200 Isolation Voltage volts 250 350 500 Resistance Tolerance % <20R: 5 20R: 1, 2, 5 <R10: 5 <20R: 5 R10: 1, 2, 5 20R: 1, 2, 5 Standard Values E24 preferred Thermal Impedance C/wat t 140 110 90 82 62 54 Ambient temperature range C -55 to +200 Physical Data Dimensions (mm) & Weight (g) D Type L max D max f min d nom PCB Min Wt. mount bend nom centres radius WP1S 6.2 2.8 21.20 0.6 10.20 0.6 0.22 WP2S 9.0 3.6 19.80 12.70 0.50 WP25S 12.5 4.5 17.80 18.40 0.50 1.2 0.8 WP3S 14.5 5.2 24.5(Note 1) 5 20.30 1.10 L f d (Note 2) WP4S 13 5.6 22.75 18.90 1.00 (Note 3) WP5S 16.5 7.0 23.55 22.86 1.75 Note 1: 5.4 for values 0R1 Note 2: 5.8 for values 0R1 Note 3: 7.2 for values 0R1 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. The components are then leadformed if required and packed. General Note General Note BI Technologies IRC Welwyn Welwyn Components reserves the right to make changes in product specification without notice or liability. TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttelectronics.com/resistors TT electronics plc Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT Electronics plc 08.10 Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com 03.20 Compact Flameproof Power CoCoCompampampacccttt FFFlllameameameppprrroooooofff PPPooowwweeerrr Wirewound Resistors Wirewound Resistors WWiirreewounwoundd ResistoResistorrss Compact Flameproof Power Welwyn Components WWelwynelwyn ComponentsComponents WP-S Series WWP-P-SS SSeeririeess WP-S Series Wirewound Resistors Welwyn Components WP-S Series TTTererermimiminatnatnatioioionnnsss Material: Hot tin dipped copper wire MaterialMaterial:: HotHot tintin dippeddipped coppercopper wiwirree Terminations StStrrengthength:: TheThe terminationsterminations meetmeet thethe rrequiequirrementsements ofof IECIEC 68.2.2168.2.21 Strength: The terminations meet the requirements of IEC 68.2.21 Material: Hot tin dipped copper wire SolderabilitySolderability:: TheThe terminationsterminations meetmeet thethe rrequiequirrementsements ofof IECIEC 115-1115-1 ClauseClause 4.17.3.24.17.3.2 Solderability: The terminations meet the requirements of IEC 115-1 Clause 4.17.3.2 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 MarkinMarkinMarkinggg Marking WP1S, WP2S, WPP2R, WP25SWP1S, WP2S, WPP2R, WP25S andand WP3SWP3S rresistorsesistors R10R10 andand aboveabove aarree markedmarked withwith four four oror five five colourcolour bandsbands inin conformance. conformance. WP1S, WP2S, WPP2R, WP25S and WP3S resistors R10 and above are marked with four or five colour bands in conformance. withwith IEC62. IEC62. belowbelow R10R10 aarree markedmarked withwith ththrreeee bandsbands (two(two digitsdigits indicatingindicating valuevalue inin milliohms,milliohms, andand tolerance) tolerance) thetherree isis nono multiplier multiplier with IEC62. below R10 are marked with three bands (two digits indicating value in milliohms, and tolerance) there is no multiplier WP1S, WP2S, WPP2R, WP25S and WP3S resistors R10 and above are marked with four or five colour bands in conformance. band. band. band. WP4S and WP5SWP4S and WP5SWP4S and WP5S rrresistorsesistorsesistors aaarrreee legendlegendlegend markedmarkedmarked withwithwith typetypetype rrrefeefeeferrrence,ence,ence, rrresistanceesistanceesistance valuevaluevalue andandand tolerance.tolerance.tolerance. with IEC62. below R10 are marked with three bands (two digits indicating value in milliohms, and tolerance) there is no multiplier band. WP4S and WP5S resistors are legend marked with type reference, resistance value and tolerance. SSoolvlveenntt RReesistansistanccee Solvent Resistance Solvent Resistance TheThe bodybody pprrotectionotection andand markingmarking aarree rresistantesistant toto allall normalnormal industrialindustrial cleaningcleaning solventssolvents suitablesuitable forfor printedprinted cicirrcuits.cuits. The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. FFllaammmmaabbililiittyy Flammability Flammability TheTheThe rrresistoresistoresistor coatingcoatingcoating willwillwill notnotnot bububurrrnnn ororor emitemitemit incandescentincandescentincandescent particlesparticlesparticles underunderunder anyanyany conditionconditioncondition ofofof appliedappliedapplied temperatutemperatutemperaturrreee ororor powerpowerpower overload.overload.overload. The resistor coating will not burn or emit incandescent particles under any condition of applied temperature or power overload. Performance Data PPeerformrformaannccee DDaattaa Performance Data MaximuMaximumm TTypicalypical ChangeChange Maximum Typical Change Maximum Typical Change Load at rated power: 1000hrs 25C R% 5 +0.001 3 LoadLoad atat ratedrated power:power: 1000hrs1000hrs 25C25C RR%% 55 +0.001+0.001 33 Load at rated power: 1000hrs 25C R% 5 +0.001 3 DryDryDry heat:heat:heat: 1000hrs1000hrs1000hrs 200C200C200C RRR%%% 555 +0.001+0.001+0.001 333 Dry heat: 1000hrs 200C R% 5 +0.001 3 ShortShort termterm overloadoverload (5(5 xx PrPr forfor 5s)5s) RR%% 55 +0.001+0.001 11 Short term overload (5 x Pr for 5s) R% 5 +0.001 1 Short term overload (5 x Pr for 5s) R% 5 +0.001 1 DDeerraattiinngg ffrroomm rraatteedd ppoowweerr 2255CC ZZeerroo aatt 228800CC Derating from rated power 25C Zero at 280C Derating from rated power 25C Zero at 280C Climatic R% 5 +0.001 2 ClimaticClimaticClimatic RR%%R% 55 5+0.001+0.001 +0.001 22 2 ClimaticClimaticClimaticClimatic categorycategorycategory category 55/200/5655/200/5655/200/5655/200/56 TRC & Vibration R% 5 +0.001 1 TRCTRC && VVibrationibration RR%% 55 +0.001+0.001 11 TRC & Vibration R% 5 +0.001 1 Robustness & solder heat R% 5 +0.001 1 RobustnessRobustness && soldersolder heatheat RR%% 55 +0.001+0.001 11 Robustness & solder heat R% 5 +0.001 1 Long term damp heat (56 days) R% 5 +0.001 1 Long term damp heat (56 days) R% 5 +0.001 1 LongLong termterm dampdamp heatheat (56(56 days)days) RR%% 55 +0.001+0.001 11 Pulse Performance PulsPulsPulseee PPPeeerforrforrformmmanananccceee The pulse energy capacity limits in the graph below relate to pulses below 100ms duration, low mean power dissipation and at TheThe pulsepulse energyenergy capacitycapacity limitslimits inin thethe graphgraph belowbelow rrelateelate toto pulsespulses belowbelow 100ms100ms duration,duration, lowlow meanmean powerpower dissipationdissipation andand atat The pulse energy capacity limits in the graph below relate to pulses below 100ms duration, low mean power dissipation and at 25C. 25C.25C. 25C. WP-S Short Pulse Energy Capacity WP-S Short Pulse Energy CapacityWP-S Short Pulse Energy CapacityWP-S Short Pulse Energy Capacity 100 100 100100 10 1010 10 WP5S WP4S WP5SWP5SWP5S 1 WP4SWP4S WP4S WP3S WP25S 1 11 WP3S WP3SWP3S WP2S / WPP2R WP25S WP25SWP25S WP1S WP2S / WPP2RWP2S / WPP2R WP2S / WPP2R 0.1 WP1SWP1S WP1S 10000 0.1 1 10 100 1000 0.1 0.10.1 Value (ohms) 100001000010000 0.0.11 11 1100 101000 10001000 0.1 1 10 100 1000 VValue (ohms)alue (ohms) Value (ohms) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK General Note Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com 08.10 BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. WWelwynelwyn ComponentsComponents LimitedLimited Bedlington,Bedlington, NorthumberlandNorthumberland NE22NE22 7AA,7AA, UKUK Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK All information is subject to TT Electronics own data and is considered accurate at time of going to print. TTelephone:elephone: +44+44 (0(0))16701670 822181822181 Facsimile:Facsimile: +44+44 (0(0))16701670 829465829465 Email:Email: info welwyn-tt.cominfo welwyn-tt.com WWebsite:ebsite: wwwwww.welwyn-tt.com.welwyn-tt.com 08.1008.10 Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com 08.10 www.ttelectronics.com/resistors TT Electronics plc 03.20 Energy (joules) Energy (joules)Energy (joules) Energy (joules)