Resistors RResisesisttororss Resistors High Power MELF Resistors High VHigh Pooltwager MELF Re MELF Resisesistortorss High Voltage MELF Resistors WRM-HP Series WRM-HV SeriesWRM-HP Series WRM-HV Series AEC-Q200 qualified High l imiting element voltage up to 1kV High l imiting element voltage up to 1kV AEC-Q200 qualified High power up to 1W 1.2/50s surge voltage to 6kV 1.2/50s surge voltage to 6kV High power up to 1W Tolerance down to 0.1% Tolerance down to 0.1% Tolerance down to 0.1% Tolerance down to 0.1% TCR down to 15ppm/C TCR d own to 25ppm/C TCR d own to 25ppm/C TCR d own to 15ppm/C High pulse handling capability High p ulse handling capabi lity All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2) AllAll partsparts aarree Pb-Pb-frfreeee andand ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU (R(RoHS2)oHS2) AllAll partsparts araree Pb-Pb-frfreeee andand ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amendedamended bbyy (EU)(EU) 2015/8632015/863 (R(RoHS3)oHS3) Electrical Data Electrical Data Electrical Data Electric al Data WRM0204HP WRM0207HP 0.4 1 Power rating at 70C watts WRM0204HVWRM0204HP WRM0207HVWRM0207HP WRM0204HV WRM0207HV Resistance range ohms R10 1M0 PPoowwer rer raating ating at 70Ct 70C wwaattstts 0.40.4 11 Power rating at 70C watts 0.4 1 Limiting element voltage volts 200 350 RResisesisttance rance rangangee ohmsohms 340K 3M4R10 1M0 Resistance range ohms 340K 3M4 Maximum overload voltage volts 400 700 Limiting elemenLimiting element vt voltoltagagee vvoltsolts 500200 1000350 Limiting element voltage volts 500 1000 TCR ppm/C 15, 25, 50, 100 15, 25, 50, 100 MaMaximum oximum ovverload verload voltoltagagee vvoltsolts 1000400 2000700 Maximum overload voltage volts 1000 2000 TCTCRR ppm/Cppm/C 15, 25, 50, 100 25, 50 15, 25, 50, 100 TCR Resistance tolerance ppm/C % 25, 500.1, 0.25, 0.5, 1, 5 RResisesisttance tance toleroleranceance %% 1M0: 0.1, 0.25, 0.5, 1 >1M0: 0.5, 10.1, 0.25, 0.5, 1, 5 Resistance tolerance % 1M0: 0.1, 0.25, 0.5, 1 >1M0: 0.5, 1 Standard values E24 & E96 StStandarandard vd valuesalues E24 & E96E24 & E96 Standard values E24 & E96 Thermal impedance C /W 200 140 Thermal impedanceThermal impedance C /WC /W 200200 140140 Thermal impedance C /W 200 140 Ambient temperature range C -55 to +155 AmbienAmbient tt temperemperaaturture re rangangee CC -55 t-55 to +155o +155 Ambient temperature range C -55 to +155 10 Insulation resistance ohms 1010>10 10 InsulaInsulation rtion resisesisttanceance ohmsohms >10>10 Insulation resistance ohms >10 284 497 Voltage proof volts VVoltoltagage pre proofoof vvoltsolts 710284 1420497 Voltage proof volts 710 1420 Physical Data PhPhyysicsicalal DDaatata Physical Data Dimensions (mm) and weight (g) Dimensions (mm) and weight (g) Dimensions (mm) and weight (g) Dimensions (mm) and weight (g) L 1 1 L L D D D1 D1 K K L L D D1 K L L D 1 K TTyyppeeType WeiWWgeighhteigh t t Type D Weight mmaxax max max max max min min min max max max min min max max max min D D 1 WRM 0204HV 3.7 1.55 1.55 0.7 1.5 0.02 WRM 0204HP 3.7 1.55 1.55 0.7 0.02 WRM 0204HV 3.7 1.55 1.55 0.7 1.5 0.02 WRM 0204HP 3.7 1.55 1.55 0.7 0.02 1 L K WRM 0207HVWRM 0207HP 6.16.1 2.4 2.4 2.4 2.4 1.2 1.2 2.9 0.080.08 WRM 0207HV 6.1 2.4 2.4 1.2 2.9 0.08 WRM 0207HP 6.1 2.4 2.4 1.2 0.08 Construction ConsConstructiontruction TTerminaerminationstions Construction Terminations Terminations A metal film is deposited onto a high dissipation A meA mettal film is deposital film is deposited oned ontto o a high dissipaa high dissipation certion ceramic famic former tormer to which o which MaMatterialerial PlaPlatted sed stteel ceel cap.ap. A metal film is deposited onto a high dissipation ceramic former to which MaterialMat erialPla ted steel cPlateap.d steel cap. ceramic former to which tin plated terminating tin platin platted ted terminaerminating cting capaps ars are fitte fitted.ed. tin plated terminating caps are fitted. Solderability The pure tin finish produces ageing free SolderSolderabilityability The purThe pure tin finish pre tin finish produces agoduces ageing freing free cee cononttacts on which acts on which Solderability The pure tin finish produces ageing free contacts on which caps are fitted. lolow melting solderw melting solders cs can be used. Dipped aran be used. Dipped area shall be ea shall be low melting soldercontacs cts an be used. Dipped aron which low meltea shall be ing solders can The rThe resisesisttor is adjusor is adjustted ted to vo value balue by a helicy a helical cut in the film and the body is al cut in the film and the body is The resistor is adjusted to value by a helical cut in the film and the body is ccoovverered with a smooth and brighed with a smooth and bright solder ct solder coaoating ating aerfterft The resistor is adjusted to value by a helical cut in the film covered with a smooth and bright solder coating aerft be used. Dipped area shall be covered with prprototectected bed by a lacquer cy a lacquer coaoating.ting. protected by a lacquer coating. 3 sec3 seconds immeronds immersion asion at 215C.t 215C. 3 seconds immersion at 215C. and the body is protected by a lacquer coating. a smooth and bright solder coating after 3 seconds immersion at 215C. MarkingMarkin g Marking SolvSolvenentt RResisesisttanceance Marking Solv ent Resistance Resistance values are colour coded with three or four bands, indicating Solvent Resistance Resistance values are colour coded with three or four bands, indicating The body prThe body prototection and marking arection and marking are re resisesisttanant tt to all normal induso all normal industrial trial ResisRtance vesistaalues arnce vaelu cesolour c are oded with thrcolour codedee or f witour bands, indich three or fourating The body protection and marking are resistant to all normal industrial value and multiplier. value and multiplier. cleaning solvcleaning solvenents suitts suitable fable for prinor printted cired circuit boarcuit boards.ds. value and multiplierbands, indic. ating value and multiplier. cleaning solvThe bodeny ts suitprotectable fionor prin and ted cirmarkcuit boaring are ds.resistant to all normal industrial cleaning solvents suitable for printed circuit boards. GenerGeneral Notal Notee General Note BI Technologies IRC Welwyn BI Technologies IRC Welwyn BI Technologies IRC Welwyn TT Electronics reserves the right to make changes in product specification without notice or liability. TT Electronics reservTT Electronics reserves the right to makes the right to make changes in product specifice changes in product specification without notice or liability.ation without notice or liability. All infAll information is subormation is subject to TT Electronics own datject to TT Electronics own data and is considered accura and is considered accuratate at time of going to print.e at time of going to print. All information is subject to TT Electronics own data and is considered accurate at time of going to print. www.ttwww.ttelectronics.com/resistorselectronics.com/resistors www.ttelectronics.com/resistors 03.17 TT Electronics plc TT Electronics plc TT Electronics plc 09.17 06.1803.17 High Power MELF Resistors High Power WRM-HP Series MELF Resistors High Power MELF Resistors WRM-HP Series WRM-HP Series Dera ng Curve High Voltage High Voltage MELF Resistors MELF Resistors Dera ng Curve Pulse Voltage 0207 WRM-HV Series WRM-HV Series 1000 0204 0207 0207 100 Performance Data Performance Data 0204 0204 10 Maximum (+0.05) Maximum (+0.05) Short time overload: 5s at lesser of 6.25 x rated power or 2 x LEV R% 0.15 Short time overload: 5s at lesser of 6.25 x rated power or 2 x LEV R% 0.15 Damp heat with load: 1000hrs 402C/90-95%RH cyclic rated power R% 1 Damp heat with load: 1000hrs 402C/90-95%RH cyclic rated power R% 1 1 0.0001 0.001 0.01 0.1 1 High temperature exposure: 1000hrs at 155C R% 1 High temperature exposure: 1000hrs at 155C R% 1 Pulse Dura on (s) Bending t est: 2mm deflection for 60s R% 0.5 Bending test: 2mm deflection for 60s R% 0.5 High Power MELF Resistors Resistance to soldering heat: 2605C for 10s R% 0.25 Resistance to soldering heat: 2605C for 10s R% 0.25 Temperature rHigh apid changPowe: 1000cyer cles -55/125C R% 1 Temperature rapid change: 1000cycles -55/125C R% 1 WRM-HP Series Lightning Surge Performance Endurance: 1000hrs rated power at 70C R% 1 Endurance: 1000hrs rated power at 70C R% 1 MELF Resistors Lightning Surge Performance Solderability: 2455C for 3s >95% coverage Solderability: 2455C for 3s >95% coverage Lightning Surge Performance High Power MELF Resistors WRM-HP Series Voltage proof: 1.42 x LEV No breakdown or flashover Voltage proof: 1.42 x LEV No breakdown or flashover WRM-HP Series Dera ng Curve 0207 1.2/50s Lightning Surge 10/700s Lightning Surge 0207 0207 0204 10,000 10,000 0207 0204 Pulse Voltage Dera ng Curve 0204 Derating Curve 0207 0204 0207 0207 1000 Pulse Performance Pulse Performance 1,000 1,000 0204 0207 Limits for R are 0.5% Limits for R are 0.5% 0207 100 0204 0204 100 100 Peak surge voltage WRM0204HV WRM0207HV Peak surge voltage WRM0204HV WRM0207HV 0204 0204 1.2/50s 4.5kV 6kV 11.2/50s0 4.5kV 6kV 10/700s 2.2kV 3kV 10/700s 2.2kV 3kV 10 10 10 100 1,000 10,000 100,000 1,000,000 10 100 1,000 10,000 100,000 1,000,000 1 Value (ohms) Value (ohms) 0.0001 0.001 0.01 0.1 1 Pulse Dura on (s) Lightning Surge Performance Ordering Procedure Ordering Procedure Ordering Procedure Lightning Surge Performance Ordering Procedure OrderingLightnin Prg Suocedurrge Performaence EExxaample: WRM0204HPC-2K49FT3mple: WRM0204HPC-2K4 (WRM0204H9FT3 (WRM0P, 50ppm/204HCP, 2.49, 50 kilohmsppm/C, 2 1%,.4 Pb9 -kfriee)lohms 1%, Pb-free) Example: WRM0204HPC-2K49FT3 (WRM0204HP, 50ppm/C, 2.49 kilohms 1%, Pb-free) Example: WRM0204HVC-1M0FT3 (WRM0204HV, 50ppm/C, 1 megohm 1%, Pb-free) Example: WRM0204HVC-1M0FT3 (WRM0204HV, 50ppm/C, 1 megohm 1%, Pb-free) 0207 1.2/50s Lightning Surge 10/700s Lightning Surge W R M 0 2 0 4 H P C - 2 K 4 9 F T 3 W R M 0 2 0 4 H V C - 1 M 0 F T 3 0207 0207 0204 10,000 1 2 3 104,0 00 5 0207 1 2 3 4 5 0204 0204 0204 0207 0207 1 2 3 4 5 1,000 1,000 1 2 3 4 5 Type TCR Value Tolerance Packing Type TCR Value Tolerance Packing WRM0204HP Y = 15pp0204m/C B = 0.1% T3 0204 3000 / 7 reel 0204 3/4 characters 100 100 D = 25ppm/C C = 0.25% WRM0207HP T2 0207 2000 / 7 reel WRM0204HV D = 25ppm/C R = ohms B = 0.1% T3 0204 3000 / 7 reel 3/4 characters K = kilohms C = 50ppm/C D = 0.5% WRM0207HV C = 50ppm/C C = 0.25% T2 0207 2000 / 7 reel K = kilohms M = megohms 10 10 Z = 100ppm/C F = 1% M = megohms D = 0.5% 10 100 1,000 10,000 100,000 1,000,000 10 100 1,000 10,000 100,000 1,000,000 J = 5% Value (ohms) Value (ohms) F = 1% OrdeOrderingr inProg Procedurecedure Ordering Procedure EExxaample: WRM0204HPC-2K49FT3mple: WRM0204HPC-2K4 (WRM0204H9FT3 (WRM0P, 50ppm/204HCP, 2.49, 50 kilohmsppm/C, 2 1%,.4 Pb9 -kfriee)lohms 1%, Pb-free) Example: WRM0204HPC-2K49FT3 (WRM0204HP, 50ppm/C, 2.49 kilohms 1%, Pb-free) W R M 0 2 0 4 H P C - 2 K 4 9 F T 3 W R M 0 2 0 4 H V C - 1 M 0 F T 3 General Note 1 2 3 4 5 03.17 BI Technologies IRC Welwyn 1 2 3 4 5 All in formation is su bject to TT Electronics own da ta and is considered accu rate at time of going to print. 1 2 3 4 5 www.t telectronics.com/resistors 03.17 1 2 3 4 5 Type TCR Value Tolerance Packing TT Electronics plc Type TCR Value Tolerance Packing Y = 15ppm/C B = 0.1% 03.17 WRM0204HP T3 0204 3000 / 7 reel 3/4 characters WRM0207HP D = 25ppm/C C = 0.25% T2 0207 2000 / 7 reel WRM0204HV D = 25ppm/C R = ohms B = 0.1% T3 0204 3000 / 7 reel 3/4 characters K = kilohms C = 50ppm/C D = 0.5% General Note C = 0.25% General NoteWRM0207HV C = 50ppm/C T2 0207 2000 / 7 reel K = kilohms BI Technologies IRC Welwyn BI Technologies IRC Welwyn M = megohms Z = 100ppm/C F = 1% TT Electronics 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. M = megohms D = 0.5% All information is subject to TT Electronics own dat a and is considered accur ate at time of going to print. J = 5% All information is subject to TT Electronics own data and is considered accurate at time of going to print. F = 1% www.ttelectronics.com/resistors www.ttelectronics.com/resistors TT Electronics plc TT Electronics plc 09.17 06.18 General Note 03.17 BI Technologies IRC Welwyn All in formation is su bject to TT Electronics own da ta and is considered accu rate at time of going to print. www.t telectronics.com/resistors 03.17 TT Electronics plc 03.17 Peak Voltage (V) Peak Voltage (V) Peak Voltage (V) Peak Voltage (V) Peak Voltage (V) Peak Voltage (V)