v itr eous enamelled w i r ewound resistors w20 series ? cecc appr oved ? suitable for harsh envir onments ? impervious lead fr ee vitr eous enamel coating ? overload characteristics ideal for pr otection cir cuits ? high stability and r eliability ? high power dissipation for size dimensions (mm) and w eight (g) t ype 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 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 this table indicates the cecc specification requirements, and these are met or exceeded by the corresponding w20 series products 4 2 w 3 2 w 2 2 w 5 1 2 w 1 2 w l a i c r e m m o c 0 . 4 1 5 . 0 1 0 . 7 0 . 5 0 . 3 s t t a w c 5 2 t a g n i t a r r e w o p k 0 0 1 o t r 1 k 0 6 o t r 1 k 2 2 o t r 1 k 5 1 o t r 1 k 0 1 o t r 1 s m h o e c n a r e l o t % 1 t a e g n a r e c n a t s i s e r k 0 0 1 o t r 1 k 0 6 o t r 1 k 2 2 o t 5 r 0 k 5 1 o t 5 r 0 k 0 1 o t 5 r 0 s m h o e c n a r e l o t % 2 k 0 0 1 o t 2 r 0 k 0 6 o t 5 1 r 0 k 2 2 o t 1 r 0 k 5 1 o t 1 r 0 k 0 1 o t 1 r 0 s m h o e c n a r e l o t % 5 + < : y l l a c i p y t c / p p ) c 0 0 2 o t 5 5 - ( r c t -75 maximum: +-200 bs cecc 40-201-002 requirements style jb hb kb lb mb 0 . 4 1 5 . 0 1 0 . 7 0 . 5 9 . 2 s t t a w c 5 2 t a g n i t a r r e w o p 0 . 2 1 0 . 9 0 . 6 3 . 4 5 . 2 s t t a w c 0 7 t a g n i t a r r e w o p k 0 0 1 o t r 1 k 6 5 o t r 1 k 0 2 o t r 1 k 5 1 o t r 1 k 0 1 o t r 1 s m h o e c n a r e l o t % 1 t a e g n a r e c n a t s i s e r k 0 0 1 o t r 1 k 6 5 o t r 1 k 0 2 o t 5 r 0 k 5 1 o t 5 r 0 k 0 1 o t 5 r 0 s m h o e c n a r e l o t % 2 k 0 0 1 o t 2 r 0 k 6 5 o t 5 1 r 0 k 0 2 o t 1 r 0 k 5 1 o t 1 r 0 k 0 1 o t 1 r 0 s m h o e c n a r e l o t % 5 c / m p p ) c 0 0 2 o t 5 5 - ( r c t 5 ohms < 10 ohms: 400 10 ohms: 200 applicable to commer cial and appr oved ranges 0 5 7 0 0 5 0 0 2 0 6 1 0 0 1 s t l o v e g a t l o v t n e m e l e g n i t i m i l r e d r o l a i c e p s o t s e u l a v r e h t o . d e r r e f e r p 4 2 e s e u l a v d r a d n a t s 2 2 9 2 4 4 8 5 8 8 t t a w / c e c n a d e p m i l a m r e h t 0 0 2 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 electrical data physical data a subsidiary of tt electr onics plc w elwyn components l d f d construction a high purity ceramic substrate is assembled with interfer ence fit end caps to which ar e welded the termination wir es. the r esistive element is wound on the substrate and welded to the caps; the vitr eous enamel pr otective coating is then applied. t erminations material copper clad steel wir e, nickel plated and solder -coated. 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. length w23? s and w24? s ar e not supplied on tape. minimum lead length is 30 mm. marking the r esistors a r e legend marked with type r efer ence, r esistance v a lue and tolerance. v alues a r e marked in accor dance with iec 62. 0 5 10 15 20 w21 W215 w22 w24 w23 400 300 200 100 0 dissipation ? w atts t emperature rise c w20_c.qxd 28/4/03 10:19 am page 1
v itr eous enamelled wir ewound resistors w20 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 welwyn components cecc 40201-002 actual performance requirements maximum typical load at commercial 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% 521 shelf life: 12 months at room temperature ? r% not specified 0.03 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 0.05 0.02 temperature rapid change ? r% 1 0.5 0.2 resistance to solder heat ? r% 1 0.25 0.03 vibration and bump ? r% 1 0.25 0.05 orez orez deificeps tonv/v )ycneuqerf fo edaced ni( esion robustness ? r% 1 0.4 0.05 mho g1.> mho g1.> deificeps tonsmho ecnatsiser noitalusni nim 005 nim 005 deificeps tonstlov foorp egatlov pulse handling data available by request performance data flammability all materials used in the construction of ?w? series resistors are inorganic and inherently non burning. b f 1 f 2 6 6 10 f 1 ? f 2 1.4 mm application notes the termination should not be bent closer than 1.6mm from the body, and the recommended minimum bend radius is 1.2mm. the terminations are solderable to within 4mm from the body. when cold, vitreous enamel has excellent insulation resistance. in common with all insulants the specific resistance of the enamel decreases with increase in temperature. therefore, resistors operated at near maximum temperature cannot be classed as insulated and should not be used in contact with any conducting material. care must be taken when determining clearance distance between the resistor body and the printed circuit board or other components to ensure these are not over heated. resistance is measured 6mm from body. 25 70 200 315 116 100 54 0 ambient temperature c derating curve % of rated power type b w21 632 W215 732 w22 732 packaging for w21 and W215 the standard method of packaging is taped in ammo packs. for w22 the standard method of packaging is taped and reeled. alternatives available by special request are detailed in the table below. w23?s and w24?s are available only as loose packed in boxes. w series resistors can be supplied preformed. contact factory for details. solvent resistance the body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. w20_c.qxd 28/4/03 10:19 am page 2
v i t reous ename l l e d w i rewound r e s i sto r s w 2 0 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 86 07.11 w elwyn components w20_c.qxd 28/4/03 10:19 am page 2 or d e r in g p r o ced ure ex a m p l e : w 2 2 a t 3 . 3 k ilo h m s and 5% to l e rance on a reel o f 700 p i e ce s ? w 2 2 ? 3 k 3 j i t ype va l ue (u s e iec62 code) t o l e rance (u s e iec62 code) f 1 % j 5 % g 2 % pa cki ng i a m m o w 2 1 , w 215 1000 / box s t anda r d t ape w 2 2 7 00/ r eel b u l k w 2 3 , w 2 4 50/ box f o r c ecc r e l eas ed p r oduc t s t a t e on o rd e r t h e c ec c num 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 ec c 4 0 2 01- 0 0 2 k b f o r s n p b f i n i s h i n s t ead o f p b -f r e e r epl a c e t h e p a c k i n g s u ffi x w i t h pb . e x a m p l e : w 2 2 - 3 k 3jpb
|
