vitreous enamelled wirewound resistors w20 series cecc approved suitable for harsh environments impervious lead free vitreous enamel coating overload characteristics ideal for protection circuits high stability and reliability high power dissipation for size dimensions (mm) and weight (g) type l max d max f min d nom wt.nom w21 12.7 5.6 22.75 0.8 1 w215 22.0 7.0 23.1 0.8 2 w22 22.0 8.0 23.1 0.8 2 w23 38.0 8.0 - 0.8 3.5 w24 53.5 8.0 - 0.8 5 general note welwyn components reserves the right to make changes in product specification without notice or liability. all information is subject to welwyn s own data and is considered accurate at time of going to print. ?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 commercial w21 w215 w22 w23 w24 power rating at 25? watts 3.0 5.0 7.0 10.0 14.0 resistance range at 1% tolerance ohms 1r to 10k 1r to 15k 1r to 22k 1r to 60k 1r to 100k 2% tolerance ohms 0r5 to 10k 0r5 to 15k 0r5 to 22k 1r to 60k 1r to 100k 5% tolerance ohms 0r1 to 10k 0r1 to 15k 0r1 to 22k 0r15 to 60k 0r2 to 100k tcr (-55 to 200?) pp/? typically: <+ -75 maximum: +-200 approved bs cecc 40-201-002 style jb hb kb lb mb power rating at 25? watts 2.9 5.0 7.0 10.0 14.0 power rating at 70? watts 2.5 4.3 6.0 9.0 12.0 resistance range at 1% tolerance ohms 1r to 10k 1r to 15k 1r to 20k 1r to 56k 1r to 100k 2% tolerance ohms 0r5 to 10k 0r5 to 15k 0r5 to 20k 1r to 56k 1r to 100k 5% tolerance ohms 0r1 to 10k 0r1 to 15k 0r1 to 20k 0r15 to 56k 0r2 to 100k tcr (-55 to 200?) ppm/? 5 ohms < 10 ohms: ?00 10 ohms: ?00 applicable to commercial and approved ranges limiting element voltage volts 100 160 200 500 750 standard values e24 preferred. other values to special order thermal impedance ?/watt 88 58 44 29 22 ambient temperature range ? -55 to 200 electrical data physical data issue c ?04.03 a subsidiary of tt electronics plc welwyn components 85 l d f d construction a high purity ceramic substrate is assembled with interference fit end caps to which are welded the termination wires. the resistive element is wound on the substrate and welded to the caps; the vitreous enamel protective coating is then applied. terminations material copper clad steel wire, nickel plated and solder-coated. strength the terminations meet the requirements of iec 68.2.21. solderability the terminations meet the requirements of iec 115-1,?clause 4.17.3.2. length w23 s and w24 s are not supplied on tape. minimum lead length is 30 mm. marking the resistors are legend marked with type reference, resistance va lue and tolerance. values are marked in accordance with iec 62. 0 5 10 15 20 w21 w215 w22 w24 w23 400 300 200 100 0 dissipation ?watts temperature rise c w20_c.qxd 28/4/03 10:19 am page 1
v it r eous enamelle d w i r ewound resistor s w20 serie s ? 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 86 issue c 04.03 w elwyn components cecc 40201-00 2 actual performance requi r ements maximu m t ypical load at comme r cial rating: 1000 hrs at 25c ? 5 . 3 5 % r load at cecc rating: 1000 hours at 25c ? r % 5 5 3.5 dry heat: 1000 hours at 200c ? r % 5 2 1 shelf life: 12 months at r oom temperatu r e ? r % not specifie d 0.0 3 0.02 derating see derating curve short term overload ? r % 1 1. 0 0.2 climatic ? r % 5 0. 5 0.2 climatic category ? r % 55/200/56 long term damp heat ? r % 5 0.0 5 0.02 t emperatu r e rapid change ? r % 1 0. 5 0.2 resistance to solder heat ? r % 1 0.2 5 0.03 v ibration and bump ? r % 1 0.2 5 0.05 o r e z o r e z d e i f i c e p s t o n v / v ) y c n e u q e r f f o e d a c e d n i ( e s i o n robustness ? r % 1 0. 4 0.05 m h o g 1 . > m h o g 1 . > d e i f i c e p s t o n s m h o e c n a t s i s e r n o i t a l u s n i n i m 0 0 5 n i m 0 0 5 d e i f i c e p s t o n s t l o v f o o r p e g a t l o v pulse handling data available by r equest performance dat a flammability all materials used in the construction of ?w? series r esistors a r e inorganic and inhe r ently non bu r ning. b f 1 f 2 6 6 10 f 1 ? f 2 1.4 mm application note s the termination should not be bent closer than 1.6mm f r om the bod y , and the r ecommended minimum bend radius is 1.2mm. the terminations a r e solderable to within 4mm f r om the bod y . when cold, vit r eous enamel has excellent insulation r esistance. in common with all insulants the specific r esistance of the enamel dec r eases with inc r ease in temperatu r e. the r efo r e, r esistors operated at near maximum temperatu r e cannot be classed as insulated and should not be used in contact with any conducting material. ca r e must be taken when determining clearance distance between the r esistor body and the printed ci r cuit boa r d or other components to ensu r e these a r e not over heated. resistance is measu r ed 6mm f r om bod y . 25 70 200 315 116 100 54 0 ambient temperature c derating curve % of rated power t yp e b w21 632 w215 732 w22 732 packaging for w21 and w215 the standa r d method of packaging is taped in ammo packs. for w22 the standa r d method of packaging is taped and r eeled. alte r natives available by special r equest a r e detailed in the table belo w . w23 ? s and w24 ? s a r e available only as loose packed in boxes. w series r esistors can be supplied p r eformed. contact factory for details. solvent resistance the body p r otection and marking a r e r esistant to all normal industrial cleaning solvents suitable for printed ci r cuits. w20_c.qxd 28/4/03 10:19 am page 2
v i t r eo us en am e l l e d w i r ewo und r e s i st o r s w 2 0 serie s ? 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 86 issue c 04.03 w elwyn components w20_c.qxd 28/4/03 10:19 am page 2 o r d e r i n g p r o ce d ur e e x a m p l e : w 2 2 a t 3 . 3 k il o h m s and 5% t o l e r an c e on a r ee l o f 70 0 p i e c e s ? w 2 2 ? 3 k 3 j i t y pe v a l ue ( u s e i e c62 c ode ) t o l e r an c e ( u s e i e c62 c ode ) f 1 % j 5 % g 2 % p a ck i ng i a m m o w 2 1 , w 21 5 100 0 / bo x s t and a r d t ap e w 2 2 7 00 / r ee l b u l k w 2 3 , w 2 4 50 / bo x t 1 t ap e w 2 1 , w 21 5 100 0 / r ee l a 0 5 a m m o w 2 2 500 / bo x f o r c e cc r e l ea s ed p r odu c t s t a t e on o r d e r t h e c e c c nu m b e r a n d s t y l e . e x a m p l e : w 2 2 - 3 k 3 j i c e c c 4 0 2 01 - 0 0 2 j b f o r s n p b f i n i s h i n s t ea d o f p b - f r e e r ep l a c e t h e p a c k i n g s u ff i x w i t h pb . e x a m p l e : w 2 2 - 3 k 3j pb
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