compact flamepr oof power w i r ewound resistors wp-s series ? small size for power rating ? enhanced pulse handling capability ? flamepr oof pr otection ? smd z-form available ? rohs compliant with pb-fr ee terminations 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 01.09 a subsidiary of tt electr onics plc w elwyn components dimensions (mm) & w eight (g) t ype l max d max f min d nom pcb min wt. mount bend nom centr es 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 wp3s 14. 5.2 24.55 20.30 1.10 wp4s 13 5.6 22.75 18.90 1.00 wp5s 16.5 7.0 3.55 22.86 1.75 a high purity ceramic substrate is assembled with interfer ence fit end caps to which ar e welded the terminations. the r esistive note 1: 5.4 for values 0r1 note 2: 5.8 for values 0r1 note 3: 7.2 for values 0r1 element is wound on the substrate and welded to the caps. flamepr oof silicone cement coating is applied prior to marking with indelible ink. the components ar e then leadformed if r equir ed and packed. electrical data physical data construction d d l f wp1s wp2s wp25s wp3s wp4s wp5s power rating at 25 c watts 1 2 2.5 3 4 5 5s overload rating at 25oc watts 5 10 12.5 15 20 25 s h p a r g e c n a m r o f r e p e s l u p e e s e c n a m r o f r e p e s l u p t r o h s 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 0 5 3 : r 1 < c / m p p r c t 1r: 200 0 0 5 0 5 3 0 5 2 s t l o v e g a t l o v n o i t a l o s i resistance t olerance % standar d v alues e24 pr eferr ed thermal impedance c/watt 140 110 90 82 62 54 5 5 1 + o t 5 5 - c e g n a r e r u t a r e p m e t t n e i b m a <20r: 5 20r: 1, 2, 5 <20r: 5 20r: 1, 2, 5 compact flamepr oof power w i r ewound resistors wp-s series w elwyn components performance data maximum t ypical change load at rated power: 1000hrs @ 25c ? r% 5 +0.001 3 dry heat: 1000hrs @ 200c ? r% 5 +0.001 3 short term overload (5 x pr for 5s) ? r% 5 +0.001 1 c 0 8 2 t a o r e z c 5 2 @ r e w o p d e t a r m o r f g n i t a r e d climatic ? r% 5 +0.001 2 climatic category 55/200/56 trc & v ibration ? r% 5 +0.001 1 robustness & solder heat ? r% 5 +0.001 1 long term damp heat (56 days) ? r% 5 +0.001 1 material: hot tin dipped 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 t erminations wp1s, wp2s, wp25s and wp3s r esistors r10 and above ar e marked with four or five colour bands in conformance with iec62. values below r10 ar e marked with thr ee bands (two digits indicating value in milliohms, and tolerance); ther e is no multiplier band. wp4s and wp5s r esistors ar e legend marked with type r efer ence, r esistance value and tolerance. marking the body pr otection and marking ar e r esistant to all normal industrial cleaning solvents suitable for printed cir cuits. solvent resistance the r esistor coating will not bur n or emit incandescent particles under any condition of applied temperatur e or power overload. flammability the pulse energy capacity limits in the graph below r elate to pulses below 100ms duration, low mean power dissipation and at 25oc. pulse performance ? 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 01.09 100 wp-s short pulse energy capacity v alue (ohms) 10 1 0.1 0.1 1 10 100 1000 10000 energy (joules) wp5s wp4s wp3s wp2s wp1s wp25s
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. wp2s, wp3s, wp4s and wp5s ar e also available in an smd format with z formed leads and packed in blister tape. consult factory for details. application notes m r o f - 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 01.09 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 <
compac t flam e p r o o f p o w e r w i r e wound r e sisto r s w p-s s e rie s w elwyn components example: wp2s at 680 ohms and 5% tolerance in ammo pack box of 2500 pieces - o r d e r i n g p r oce d u r e ? 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 01.09 t ype wp2s ? 680r j a25 v alue (use iec 62 code) t olerance (use iec 62 code) packing f 1% g 2% j 5% a5 wp1s 5000/box a25 wp2s 2500/box a15 ammo wp25s 1500/box a1 wp3s 1000/box standar d a1 wp4s 1000/box t07 t ape wp5s 750/r eel 5
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