high v oltage p r ecision thick film resistors t series s w orking voltage up to 100kv s resistances up to 50g s tcr down to 25ppm s t ermination variants s sets of r esistors with matched characteristics t43 t44 t48 notes power rating at 20c * contact factory for 25 or 50ppm/c watts 1.5 3.5 10 resistance range ohms 1k to 10g 1k to 50g 1k to 50g limiting element voltage volts 4k 14k 50k in air 8k 28k 100k in oil tcr ppm/c 100 * v alues > 1g: tcr is 250ppm/c resistance tolerance % 1, 2, 5 closer tolerances over r estricted range v alues e24 pr eferr ed values any value to special or der thermal impedance c/watt 31 27 13 ambient temperatur e range c -55 to 150 general note w elwyn components r eserves the right to make changes in pr oduct specification without notice or liability . all information is subject to w elwyn? s own data and is consider 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 electrical data 02 . 08 a subsidiary of tt electr onics plc w elwyn components dimensions (mm) & w eight (g) pcb min mounting bend t ype l max d max f min d nom centr es radius wt. nom t43d 25.4 8.4 32.0 0.8 31.8 1.2 3.1 t44d 50.8 8.4 32.0 0.8 57.2 1.2 5.6 t48d 150.0 8.4 32.0 0.8 156.4 1.2 18.5 t43ku 9 . 3 8 . 0 0 . 2 3 5 . 8 2 . 0 3 t44ku 4 . 7 8 . 0 0 . 2 3 5 . 8 2 . 3 5 t48ku 3 . 9 1 8 . 0 0 . 2 3 5 . 8 2 . 2 5 1 t43tu 8 . 5 5 . 8 6 . 2 3 t44tu 2 . 8 5 . 8 6 . 5 5 t48tu 2 . 0 2 5 . 8 8 . 4 5 1 physical data l d f d l l t44d t44tu t44ku
high v oltage p r ecision thick film resistors t series ? 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 02 . 08 w elwyn components 194 matched sets matched sets can be supplied for use as pr ecision voltage dividers. these may be scr ewed together to form sticks and, by selecting the ku type of termination, a wir e connection can be pr ovided at each end of the stick. enquiries ar e welcomed for special r esistors and sets when r esistor length, operating voltage or r esistance value ar e outside the catalogued range. application notes due to the high voltage which can appear between the end cap and any adjacent metal part, r esistors should be mounted at an adequate distance fr om other conductors. an appr opriate number of r esistors may be scr ewed together as a stick to pr ovide an assembly which will be capable to withstanding any desir ed voltage, pr oviding no individual r esistor is subject to a gr eater str ess or power dissipation than is r ecommended in this data sheet, and that appr opriate anti- cor ona devices ar e fitted. the axial termination should not be bent closer than twice the diameter of the terminal wir e fr om the body of the r esistor . construction a ruthenium oxide based r esistive film is fir ed onto the surface of a high quality former . t ur ned brass end caps ar e fitted. a helical cut is made into the film to adjust its r esistive value and finally a pr otective sleeve is fitted to pr ovide mechanical pr otection and electrical insulation. resistors for use in oil or sf6, can be supplied with a lacquer pr otection instead of the sleeve. t erminations thr ee styles of termination ar e available to permit r esistors to be scr ewed together in a series chain, with the end members having axial wir es for soldering. wir e t erminations: styles d and ku. non standar d terminations available upon r equest. material: solder coated copper wir e. str ength: the terminations meet the r equir ements of iec 68.2.21 solderability: the terminations meet the r equir ements of iec 115-1, clause 4.17.3.2. scr ew t erminations: styles tu and ku. material: t ur ned brass. scr ew thr ead: all caps ar e tapped unf ? 10 x 4.2 deep. unf ? 10 is 32 tpi, 60c thr ead angle, 4.720.07 mm outside diameter , 3.83 mm cor e diameter . coupling stud: all ku & tu r esistors ar e supplied with 8 mm long scr ewed brass studs. marking t ype r efer ence, r esistance value, tolerance and date code ar e legend marked. the r esistance value conforms to iec 62. solvent resistance the lacquer and the pr otective sleeve pr ovide excellent r esistance to all normal industrial cleaning solvents suitable for printed cir cuits. standar d quantities per box all t ypes 10 or 20 per box maximum t ypical load at rated power: 1000 hours at 20c ? r% 3 . 0 5 : g i > , 3 : g i shelf life: 12 months at r oom temperatur e ? r% 0.3 0.1 derating fr om rated power at 20c zer o at 150c noise (in a decade of fr equency) v/v <2.5 v oltage coef ficient of r esistance ppm/v <1 performance data when r esistors ar e r equir ed to be potted, the pr eferr ed encapsulant is a silicone compound. for voltage dividers with a low r esistance section below the minimum available value of 1k , it is normal practice to use a w elwyn r esistor , rc series, obtainable down to 1 ohm. oil immersion for some high voltage applications it is r equir ed to immerse the components in oil or gas to r educe the ef fects of cor ona and surface tracking. a special lacquer pr otected version of the r esistor is available, suitable for immersion in transformer oil or sf6. packaging resistors ar e supplied packed in boxes.
high v oltage p r ecision thick film resistors t series ? 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 02 . 08 w elwyn components or d e r in g p r o ced u r e ex a m p l e : t44 w i re -ended and s l e e v ed a t 4 . 7 g i goh m s and 5% to l e rance - t 4 4 d ? 4 g 7 j i t yp e t e r mi nat i o n d w i r e / wir e k u w i r e / sc r e w t u s cr e w / sc r e w pro t e ct i o n lacque r e d & s l eev e d h lacque r e d onl y ( f o r u se i n o i l o r s f 6 ) va l ue (u s e iec62 code) t o l e rance (u s e iec62 code) f 1 % g 2 % j 5 % pa cki ng i b o x 10 o r 2 0 / box s t anda r d n o t e : st a nda rd t cr i s 1 0 0 p p m / c . c o n t a c t f a c t o r y f o r 5 0 a n d 2 5 ppm / c g r a d e s .
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