lo w r esis t ance me t al eleme n t r esis t or s l ob series ultr a l o w r esis t ance v alues (0.005 t o 0.1) a v ail a ble in 1, 3 and 5 r a t ed pack ag es t oler ances fr om 1% t o 5% inher en tly (.02h a t 0.5mhz) lo w t empe r a tur e of r esis t ance high s t ability o v er li f e * power dissipation - the maximum wattage rating depends upon the amount of heat which can be transferr ed to the surr oundings w hile not exceeding the maximum element temperatur e. ambient air temperatur e, velocity of cooling air , thermal r esistance of heat and the temperatur e of surr ounding ob jects will af fect this transfer , this must be taken into account when selecting a r esistor . l o w res i sta n c e m e t a l e l e m e n t res i sto r s l o b s e r i e s ? ultra low r esistance values (0.005 to 0.1 ) ? a vailable in 1, 3 and 5 watt rated packages ? t olerances fr om 1% to 5% ? inher ently non-inductive ( .02h at 0.5mhz) ? low temperatu r e coef ficient of r esistance ? high stability over life dimensions (mm) t ype l max. d max. f min. d nom. c lob-1 9.90.3 3.60.2 38.13. 2 0.8130.0 5 33.27 lob-3 14.220.2 5 5.330.25 34.933.1 8 0.810.05 33.27 lob-5 23.370.2 5 8.380.25 31.753.1 8 1.020.05 42.42 general note w elwyn components r eserves the right to make changes in pr oduct specification without notice or liabilit y . all information is subject to w elwyn? s own data and is conside r ed accurate at time of going to print. ? 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 lob-1 lob-3 lob-5 continuous power dissipation at 25c in fr ee air watts 1 3 5 5 2 5 1 5 s t t a w s d n o c e s 5 r o f r e w o p d a o l r e v o s t l o v e g a t l o v g n i k r o w m u m i x a m 1xr 3xr 5xr -55 to 175 -55 to 175 -55 to 175 c operating temperature e l e c t r i c a l d a t a phy s i c a l d a t a issue b 03.02 a subsidiary of tt electr onics plc w elwyn components 104 l c d f d contact point contact point description lob series power pr ecision metal element r esistors featur e r esistance values down to 0.005 with virtually no inductance. a vailable in 1, 3 and 5 watt rated axial leaded packages, these r esistors ar e compatible with automatic insertion equipment. applications ? switchmode and linear power supplies. ? automotive curr ent-sensing cir cuits. ? instrumentation. construction lob series r esistors featur e tinned copper leads welded dir ectly to a low temperatur e coef ficient r esistance element in a highly automated pr oprietary pr ocess. the leaded r esistor elements ar e then encapsulated in a moulding compound. r esis t or s all pb- fr ee parts c omply with eu 2011/65/eu (r ohs2) low resistance metal element resistors lob series ww w .bitechnologies.com ww w .i r ctt.com ww w .welwyn-tt.com general note tt elect r onics r eserves the right to make changes in p r oduct speci?cation without notice or liabilit y . all information is subject to tt elect r onics? own data and is conside r ed accurate at time of going to print. ? tt elect r onics plc 11. 11 ultra low r esistance values (0.005 to 0.1 ) a vailable in 1, 3 and 5 watt rated packages t olerances f r om 1% to 5% inhe r ently non-inductive ( .02h at 0.5mhz) low temperatu r e coef?cient of r esistance high stability over life * power dissipation - the maximum wattage rating depends upon the amount of heat which can be transfer r ed to the sur r oundings w hile not exceeding the maximum element temperatu r e. ambient air temperatu r e, velocity of cooling ai r , thermal r esistance of heat and the temperatu r e of sur r ounding ob jects will a this transfe r , this must be taken into account when selecting a r esisto r . l o w r e s i s t a n c e m e t a l e l e m e n t r e s i s t o r s l o b s e r i e s ? ultra low r esistance values (0.005 to 0.1 ) ? a vailable in 1, 3 and 5 watt rated packages ? t olerances f r om 1% to 5% ? inhe r ently non-inductive ( .02h at 0.5mhz) ? low temperatu r e coe of r esistance ? high stability over life dimensions (mm) t yp e l max . d max . f min . d nom . c lob-1 9.90. 3 3.60. 2 38.13. 2 0.8130.0 5 33.27 lob-3 14.220.2 5 5.330.2 5 34.933.1 8 0.810.0 5 33.27 lob-5 23.370.2 5 8.380.2 5 31.753.1 8 1.020.0 5 42.42 general note w elwyn components r eserves the right to make changes in p r oduct without notice or liabilit y . all information is subject to w elwyn ? s own data and is conside r ed accurate at time of going to print. ? 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: ww w .welwyn-tt.com lob-1 lob-3 lob-5 continuous power dissipation at 25c in f r ee air watts 1 3 5 overload power for 5 seconds watts 5 15 25 maximum working voltage volts 1xr 3xr 5xr maximum storage temperatu r e c 175 175 175 e l e c t r i c a l d a t a p h y s i c a l d a t a issue b 03.02 a subsidiary of t t elect r onics plc w elwyn components 104 l c d f d contact point contact point description lob series power p r ecision metal element r esistors featu r e r esistance values down to 0.005 with virtually no inductance. a vailable in 1, 3 and 5 watt rated axial leaded packages, these r esistors a r e compatible with automatic insertion equipment. applications ? switchmode and linear power supplies. ? automotive cur r ent-sensing ci r cuits. ? instrumentation. construction lob series r esistors featu r e tinned copper leads welded di r ectly to a low temperatu r e coe r esistance element in a highly automated p r oprietary p r ocess. the leaded r esistor elements a r e then encapsulated in a moulding compound. * power dissipation - the maximum wattage rating depends upon the amount of heat which can be transfer r ed to the sur r oundings w hile not exceeding the maximum element temperatu r e. ambient air temperatu r e, velocity of cooling ai r , thermal r esistance of heat and the temperatu r e of sur r ounding ob jects will a this transfe r , this must be taken into account when selecting a r esisto r . l o w r e s i s t a n c e m e t a l e l e m e n t r e s i s t o r s l o b s e r i e s ? ultra low r esistance values (0.005 to 0.1 ) ? a vailable in 1, 3 and 5 watt rated packages ? t olerances f r om 1% to 5% ? inhe r ently non-inductive ( .02h at 0.5mhz) ? low temperatu r e coe of r esistance ? high stability over life dimensions (mm) t yp e lob-1 9.90. 3 l d f d c nom 33.27 0.8130.0 5 38.13. 2 3.60. 2 lob-3 14.220.2 5 5.330.2 5 34.933.1 8 33.27 0.810.0 5 lob-5 23.370.2 5 42.42 1.020.0 5 31.753.1 8 8.380.2 5 general note w elwyn components r eserves the right to make changes in p r oduct without notice or liabilit y . all information is subject to w elwyn ? s own data and is conside r ed accurate at time of going to print. ? 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: ww w .welwyn-tt.com lob-1 lob-3 lob-5 continuous power dissipation at 25c in f r ee air watts 1 3 5 overload power for 5 seconds watts 5 15 25 maximum working voltage volts 1xr 3xr 5xr c e l e c t r i c a l d a t a p h y s i c a l d a t a issue b 03.02 a subsidiary of t t elect r onics plc w elwyn components 104 l c d f d contact point contact point description lob series power p r ecision metal element r esistors featu r e r esistance values down to 0.005 with virtually no inductance. a vailable in 1, 3 and 5 watt rated axial leaded packages, these r esistors a r e compatible with automatic insertion equipment. applications ? switchmode and linear power supplies. ? automotive cur r ent-sensing ci r cuits. ? instrumentation. construction lob series r esistors featu r e tinned copper leads welded di r ectly to a low temperatu r e coe r esistance element in a highly automated p r oprietary p r ocess. the leaded r esistor elements a r e then encapsulated in a moulding compound. -55 to 175 operating temperature 08.16 gener al not e all inf ormation is sub ject to tt electronics? own dat a and is considered accur at e at time of going to print. ? tt electronics plc www.tt electronicsresistors.com bi t echnologies ir c w elwyn
low resistance metal element resistors lob series low resistance metal element resistors lob 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 11. 11 0 25 50 75 100 400 300 200 100 0 resistance (ohms x 10 -3 ) temperature coefficient of resistance (ppm/ c) low resistance metal element resistors lob 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 105 issue b 03.02 welwyn components % x am 202 dts - l im t set ? t i nu *r % %1 801 doh t em ) s r uoh 0002 ( e f i l dao l ? r % %1 701 doh t em k coh s l amr eht ? r % %5.0 402 doh t em noi tarbiv ? r % %5.0 312 doh t em kcohs l ac i nahcem ? r % %5.0 103 doh t em htgnerts ci rtceleid ? r 01> 203 doh t em ecnats i ser noi talusni 11 ohms 0 25 50 75 100 125 150 175 100 90 80 70 60 50 40 30 20 10 0 ambient temp ( c) rated power (%) power derating percentage vs free air ambient temperature temperature coefficient of resistance vs resistance value *0.0005 ohm allowance for test/contact error. packaging resistors are supplied taped and reeled. bulk packaging available. ordering procedure example: lob3 at 10 milliohms and 5% tolerance on a reel of 1250 pieces - l o b 3 ? r 0 1 j i type value (use iec62 code) tolerance (use iec62 code) f 1% j 5% h 3% note: 1% & 5% preferred packing i tape lob1 3500/reel standard lob3 1250/reel lob5 800/reel lob1 lob3 lob5 08.16 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 bi technologies irc welwyn
low resistance metal element resistors lob series o r d e r ing pr o cedur e t h i s p ro d u c t h a s t w o v a lid p a rt num bers : e u r opean ( w e lw y n ) p a r t nu m b e r: l o b3- r0 1ji ( l o b 3 , 10 m ill i o h m s 5 % , p b - f r ee) l o b 3 - r 0 1 j i 1 2 3 4 us a ( irc) p a r t nu m b e r : l o b - 3 r010flfslt ( l o b 3 , 1 0 m illio h m s 5% , p b - f r e e ) l o b - 3 r 0 1 0 f l f s l t 1 2 3 4 5 1 2 3 4 t y p e va lue tole r a n c e packing & t e r m i n a tion finis h l o b1 r = ohm s f * = 1 % i = st a n dard pac k i ng & pb - f re e l o b3 h = 3 % pb = st and a rd p a c k i n g & sn p b l o b5 j * = 5 % l o b1 t aped, 3 5 00/ re e l * p re f e rre d l o b3 t aped, 1 2 50/ re e l l o b5 t aped, 8 0 0 / re e l 1 2 3 4 5 t y p e va lue tole r a n c e t e r m ina ti on fin i s h packing l o b - 1 r = ohm s f = 1 % o m i t fo r s n pb slt = lead t ape* l o b - 3 h = 3 % l f = pb - f r e e l o b - 1 3500/ r eel l o b - 5 j = 5 % l o b - 3 1250/ r eel l o b - 5 800/ re e l bl k = bu l k * p re f e rre d lob-1 1500/box 800/box 200/box lob-3 lob-5 08.16 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 bi technologies irc welwyn
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