constructon a high purity ceramic rod is assembled with interference ft end caps to which are welded the terminatons. the surge withstanding resistve element is wound on the rod and welded to the caps. flameproof fusible cement coatng is applied prior to marking with indelible ink. the components are then leadformed if required and packed. marking ULW2, ULWp2r & ULW3 resistors are marked with fve colour bands. the frst four indicate value and tolerance in conformance with iec62. the ffh yellow band denotes defned fusibility. ULW4 and ULW5 resistors are legend marked with type, value and tolerance. ULW2 / ULWp2r ULW3 ULW4 ULW5 power ratng at 25c wats 2 3 4 5 5 second overload ratng at 25c wats 10 15 20 25 inrush / surge performance see pulse performance graphs resistance range ohms 1r0 to 100r tcr ppm/c 200 isolaton voltage volts 250 350 500 resistance tolerance % 5 ul recognised standard values ohms any value in the range 1r0 to 100r is recognised. e24 preferred thermal impedance c/wat 110 82 62 54 ambient temperature range c -55 to +155 ul recognised wirewound resistors ULW series physical data ul1412 recognised fusible resistor * failsafe mains fusing at 120 / 240vrms inrush and surge withstanding ul94-v0 fameproof coatng surface mount zi-form opton * ul fle number e234469. electrical data dimensions (mm) and weight (g) type l max d max f min d nom pcb mount centres min bend radius wt. nom ULW2 9.0 3.8 19.8 0.8 12.7 1.2 0.5 ULW3 14.5 5.8 24.6 20.3 1.1 ULW4 13 5.6 22.8 18.9 1.0 ULW5 16.5 7.2 23.6 22.9 1.8 note - no limitng element voltage applies; maximum contnuous voltage is (p.r) d f l d resistors all pb-free parts comply with eu directve 2011/65/eu (rohs2) bi technologies irc welwyn 09.17 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.ttelectronics.com/resistors
ul recognised wirewound resistors ULW series terminatons material: hot tn dipped copper wire strength: the terminatons meet the requirements of iec 68.2.21 solderability: the terminatons meet the requirements of iec 115-1 clause 4.17.3.2 solvent resistance the body protecton and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. flammability the resistor coatng will not burn or emit incandescent partcles under any conditon of applied temperature or power overload. * additon of 0.01 applies maximum* typical load at rated power (1000 hours @ 25c) r% 5 3 short term overload (5 x pr for 5 seconds) r% 5 1 pulse (see pulse performance graphs) r% 5 2 climatc r% 5 2 long term damp heat (56 days) r% 5 1 climatc category 55/200/56 temperature rapid change r% 5 1 dry heat (1000 hours @ 200c) r% 5 3 vibraton r% 5 1 robustness & solder heat r% 5 1 performance data thermal performance body temperature rise 0 50 100 150 200 250 300 0 1 2 3 4 5 power (w) temperature rise (c) derating curve 0 20 40 60 80 100 0 50 100 150 200 250 300 ambient temperature (c) proportion of rated power (%) ULW2 / ULWp2r ULW3 ULW4 ULW5 bi technologies irc welwyn 09.17 general note ng gggg letron l
0 2 4 6 8 10 12 14 16 18 20 0 10 20 30 40 50 60 70 80 90 100 energy (j) value (ohms) pulse energy limit (single or low repetition rate, r<5% ) . ULW2 & ULWp2r ULW3 & 4 ULW5 0 1 2 3 4 5 6 0 10 20 30 40 50 60 70 80 90 100 peak voltage (kv) value (ohms) 1.2/50 s peak voltage limit (10 pulses at 10s intervals, r<5% ) note the voltage show n is the nett voltage across the resistor. the generator open circuit voltage w ill be higher due to the generator's internal impedance. ULW2 & ULWp2r ULW3 & 4 ULW5 pulse performance &pw(u ul recognised wirewound resistors ULW series bi technologies irc welwyn 09.17 77 77
fusing performance ul w5 fusing characteristic 0 10 20 30 40 50 60 80 1001 20 1401 60 1802 00 initial power (w ) maximum fusing time (s ) notes: 1. typical fusing times are around 1/3 of the maximum fgures. 2. after fusing the resistance value is >100 times the initial nominal value, provided the initial power is at least 20 x rated power. 3. suitable for fusing at voltages up to 264vrms. ul recognised wirewound resistors ULW series bi technologies irc welwyn 09.17 general note ng gggg letron l
ULWp2r radial taped dimensions (mm) dimension notaton nominal tolerance component body length l 10.0 max component body diameter d 4.0 max terminal lead diameter d 0.8 nom component pitch p 12.7 0.5 pitch of holes po 12.7 0.2 distance between hole & component p1 3.85 0.3 p2 5.85 0.5 lead pitch f 5.0 +0.75 -0.34 width of backing strip w 18.0 0.3 positon of hole w1 9.0 0.25 diameter of hole do 4.0 0.3 height to lead form ho 16.0 0.3 height from lead form ho1 21.7 max height to resistor ho2 18.0 max width of adhesive tape w2 15.0 0.5 length of protrusion l <2.5 form dimensions k1 2.0 0.3 k2 3.0 0.5 k3 1.5 0.25 k4 1.0 0.2 ul recognised wirewound resistors ULW series applicaton notes 1. if the resistors are to dissipate full rated power, it is recommended that the terminatons should not be soldered closer than 4mm from the body. 2. due to operatng temperature limits imposed by some pcb materials, deratng may be necessary. an estmate of the temperature rise to be expected can be calculated using the thermal impedance fgures given under electrical data. 3. for the purposes of ul approval, the following points should be observed: 3.1 to protect against fre under all conditons of overload, a positve clearance of at least 13mm should be provided between the body of the resistor and any combustble materials. 3.2 a positve clearance of 13mm should be provided between the resistor body or terminatons and uninsulated parts of opposite polarity or uninsulated dead metal parts. 3.3 limited short circuit testng should be performed in the complete appliance. 4. ULW resistors can also be supplied with radial, goalpost or lancet pre-formed leads. in partcular ULW2, ULW3, ULW4 and ULW5 are available in zi-form smd format packed in blister tape C see htp://www.telectronics.com/sites/default/fles/resistors-datasheets/zi-form.pdf also a 2w radial taped version* is available as shown below *although body dimensions difer slightly, ULWp2r performance and electrical data are identcal to those of ULW2 1. if the r esistors ar e to dissipate full rated power , it is r ecommended that the terminations should not be solder ed closer th an 4mm fr om the body . 2. due to operating temperatur e limits imposed by some pcb materials, derating may be necessary . an estimate of the temperatur e rise to be expected at the center of the body can be calculated using the thermal impedance figur es given under electrical data. 3. wp-s r esistors can also be supplied with radial, goalpost or lancet pr e-formed leads. in particular, wp2s, wp3s, wp4s and wp5s are available in zi-form smd format packed in blister tape - see http://www.ttelectronicsresistors.com/pdf/datasheet/zi-form.pdf application notes m r o f i- z t e c n a l t s o p l a o g l a i d a r compact flamepr oof power w i r ewound resistors wp-s series w elwyn components ? 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 08.10 the standar d packaging for wp-s is taped. the critical dimensions ar e shown in figur e 1. the component wir es will not pr otrude beyond the outside edge of the tapes. t aped pr oduct is then packed into boxes or onto r eels; see or dering pr ocedur e for details. alter native packaging is available by r equest. pr e-formed r esistors ar e supplied loose packed in plastic bags or b oxes. packaging dimensions (mm) b c wp1s 52 5 wp2s 52 5 wp25s 52 5 wp3s 67 10 wp4s 63 10 wp5s 63 10 figure 1 6 6 c b f1 f2 body location f1 - f2 1.4mm < application notes application notes 1. if the resistors are to dissipate full rated power, it is recommended that the terminations should not be soldered closer than 4mm from the body. 2. due to operating temperature limits imposed by some pcb materia ls, derating may be necessary. an estimate of the temperature rise to be expected at the center of the body can be calculated using the thermal impedance figures given under electrical data. 3. for the purpose of ul approval, the following points should b e observed: 3.1 to protect against fire under all conditions of overload, a positive clearance of at least 13mm should be provided between the body of the resistor and any combustible materials. 3.2 a positive clearance of 13mm should be provided between t he resistor body or terminations and uninsulated parts of opposite polarity or uninsulated dead metal parts. 3.3 limited short circuit testing should be performed in the complete appliance. 4. ULW resistors can also be supplie d with radial, goalpost or l ancet pre - formed leads. in particular ULW2, ULW3, ULW4 and ULW5 are available in zi - form smd format packed in blister tape C see http://www.ttelectronics.com/sites/default/files/resistors - datasheets/zi - form.pdf also a 2w r adial t aped version * is availabl e as show n below. * although body dimensions differ slightly, ULWp2 r perfo rmance and electrical d ata are identical to those of ULW2 ULWp 2r radial taped dimensions (mm) dimension notation nominal tolerance component body length l 10.0 m ax component body diameter d 4.0 m ax terminal lead diameter d 0.8 n om component pitch p 5 0.5 pitch of holes po 10 0 .2 distance between hole & component p1 3.85 0.3 p2 5.85 0.5 lead pitch f 5.0 +0.75 - 0.34 width of backing strip w 18.0 0.3 position of hole w1 9.0 0.25 diameter of hole do 4.0 0.3 height to lead form ho 16.0 0.3 height from lead f orm ho1 17.0 max height to resistor ho2 18.0 min width of adhesive tape w2 15.0 0.5 length of protrusion l <2.5 form dimensions k1 2.0 0.3 k2 3.0 0.5 k3 1.5 0.25 k4 1.0 0.2 (delete redundant sub title) (this diagram exists on wp - s, so just copy it) bi technologies irc welwyn 09.17 eneral 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. www.ttelectronics.com/resistors
dimensions (mm) type b c ULW2 52 5 ULW3 67 10 ULW4 63 10 ULW5 packaging the standard packaging for ULW is taped. the critcal dimensions are shown in figure 1. the component wires will not protrude beyond the outside edge of the tapes. taped product is then packed into ammo boxes for ULW2, 3 and 4 or onto reels for ULW5. alternatve packaging is available by request. the standard packaging for ULWp2r is tape and reel. pre-formed radial, goalpost & lancet resistors are supplied loose packed in plastc bags or boxes. zi-form smd are packed in blister tape C see htp://www.telectronics.com/sites/default/fles/resistors-datasheets/zi-form.pdf f1 f2 6 6 c body location f1 - f2 < 1.4mm figure 1 b ul recognised wirewound resistors ULW series ordering procedure example: ULW2 - 33rja25 ( ULW2, 33 ohms 5 % , pb - free) example: ULWp2r - 33rjt15 ( ULWp2r radially formed & taped, 33 ohms 5 % , pb - free) u l w 2 - 3 3 r j a 2 5 1 2 3 4 5 1 2 3 4 5 type leadforming value tolerance packing ULW2 optional code 3/4 characters j = 5% a25 ULW2 ammo pack, 2500/box ULW3 r = ohms a1 ULW3, ULW4 ammo pack, 1000/box ULW4 t075 ULW5 tape & reel, 750/reel ULW5 u l w p 2 r - 3 3 r j t 1 5 1 2 3 4 5 1 2 3 4 5 type leadforming value tolerance packing ULWp2 r = radial taped 3/4 characters j = 5% t15 tape & reel, 1500/reel r = ohms bi technologies irc welwyn 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.ttelectronics.com/resistors
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