aluminium housed wirewound resistors wh series www.bitechnologies.com www.irctt.com www.welwyn-tt.com 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 07. 12 high power dissipation up to 300w all welded construction suitable for severe environments designed for excellent thermal conductivity to heatsink spade terminal option rohs compliant alu m i n i u m h oused w i r e w ound r e si st o r s w h s er i e s ? h i gh pow e r d i ss i p a t i on up t o 300 w ? a l l w e l d e d c ons t r u c t i on ? s u i t a b l e f o r s e v e r e e n v i r onm e n ts ? d e s i gne d f o r e x ce ll e n t t h e r m a l c onduc t i v i t y t o h ea t s i nk ? s p a d e t e r m i n a l opt i on ? r o h s c o m p l i a nt e l ect r i ca l d a ta w h 5 w h 10 w h 25 w h 50 n o t es p o w e r r a t i n g a t 25 c w a tt s 10 15 25 2 50 1 , 2 o n st and a r d h e a t si n k r e si st an ce r ang e o h m s 0 r 01 t o 1 0 k 0 r 01 t o 2 0 k 0 r 01 t o 4 4 k 0 r 015 t o 120 k t cr ( - 55 t o 200 c ) p p m / c <10 r : 7 5 10 r t o <100 r : 5 0 1 00 r : 2 5 r e si st an ce t o l e r an ce % 1 ( f ) , 2 ( g ) , 5 ( j) an d 10 ( k ) lo w va l u e lim i t s o h m s 1 r a t 1 % 0 r 5 a t 2 % 0 r 05 a t 5 % 0 r 01 a t 1 0 % w h 50 0 r 01 5 a t 1 0 % i so l a t i o n vo l t ag e vo l t s 1500 1500 3000 3000 dc o r a c p e a k n o t e 1 : f o r l oad a t f u l l r a t in g m ount on alu m i n i u m h eat s i n k 3 0 . 5 c m x 3 0 . 5 c m x 1 . 5 mm n o t e 2 : w h 25t & w h 50t a r e a d dit i o n all y r a t ed a t 1 5 a c e cc 4020 3 - 00 6 r e qui r e m e n t s * aa ba ca da n o t es p o w e r r a t i n g a t 25 c w a tt s 10 15 25 40 o n st and a r d h e a t si n k r e si st an ce r ang e o h m s 0 r 05 t o 3 k 4 0 r 05 t o 1 5 k 0 r 05 t o 3 3 k 0 r 05 t o 8 2 k t cr ( - 55 t o 200 c ) p p m / c 5 r t o 10 r : 10 0 >10 r : 5 0 r e si st an ce t o l e r an ce % 1 ( f ) , 2 ( g ) , an d 5 ( j) lo w va l u e lim i t s o h m s 1 r a t 1 % 0 r 5 a t 2 % 0 r 05 a t 5 % i so l a t i o n vo l t ag e vo l t s 1000 1000 2000 2000 dc o r a c p e a k * t his t abl e i n d i c a t e s t h e c e cc s p e c i f i c a t i o n r equ i r e m e n t s w hic h a r e m e t o r e x c eed e d b y t h e c o rr e s p o n din g w h s e ri e s p r oduc t s . l i m i t i ng e l e m e n t vo l t a g e vo l t s 150 250 500 1250 dc o r a c r m s s t and a r d va l u e s e 24 p r e f e rr e d r ang e o t h e r va l u e s t o o r d e r t h e r m a l i m p e dan ce c / w a t t 16 . 0 10 . 0 6 . 0 3 . 5 o n st and a r d h e a t si n k a m b i e n t t e m p e r a t u r e r ang e c - 55 t o 200 w h 100 w h 200 w h 300 n o t es p o w e r r a t i n g a t 25 c w a tt s 100 200 300 o n st and a r d h e a t si n k r e si st an ce r ang e o h m s 0 r 01 t o 7 0 k 0 r 01 t o 5 0 k 0 r 01 t o 6 8 k t cr ( - 55 t o 200 c ) p p m / c 1 k 0 : 1 00 >1k 0 : 25 r e si st an ce t o l e r an ce % s t and a r d 5 ( j ) and 10 ( k ) . a l so a va i l a b l e : 1 ( f ) a nd 2 ( g ) lo w va l u e lim i t s o h m s t yp i c a l l y 0 r 0 5 : 5 % 0 r 04 7 : 1 0 % i so l a t i o n vo l t ag e vo l t s 6360 7070 7070 dc o r a c p e a k l i m i t i ng e l e m e n t vo l t a g e vo l t s 1900 1900 2500 dc o r a c r m s s t and a r d va l u e s e 24 p r e f e rr e d r ang e o t h e r va l u e s t o o r d e r t h e r m a l i m p e dan ce c / w a t t 1 0 . 7 0 . 6 o n st and a r d h e a t si n k a m b i e n t t e m p e r a t u r e r ang e c - 55 t o 200 g e n e r a l n o t e w e l w y n c o m p o n ent s r e s e r v e s t h e ri g h t t o m a k e c h a ng e s i n p r oduc t s p e c i f i c a t i o n w i t h out n o t i c e o r l i a b i l i t y . a ll in f o r m a t i on i s s u bj e c t t o w e l w y n s o w n t e s t d a t a a n d i s c ons id e r e d a cc u r a t e a t t i m e o f p ri n t. ? w e l w y n c o m p o n e n t s l i m i t ed w e l w y n e l e c t r o n i cs p a r k , b e d l i n g t on, n o rt h u m b e r l and, n e 22 7 aa , e ngl a n d . t el: 0 16 70 8 2 2 18 1 f a x : 01 6 7 0 8 2 94 65 w e b : www . w e l w y n -t t . c om
aluminium housed wirewound resistors wh series www.bitechnologies.com www.irctt.com www.welwyn-tt.com 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 07. 12 alum i niu m h o u s e d w i r e w ound r e s i s t o r s p h y s i c a l d a ta dim e n s i on s (m m ) & w e i g h t ( g ) w h 5 , 1 0 , 2 5 & 50 a b c e f g h l m n d t w t . t yp e m ax 0 . 3 0 . 3 m i n m ax m ax d i a 0 .2 m ax 0 . 5 m ax m i n n o m w h 5 30 12 . 4 11 . 3 1 . 9 17 9 2 . 4 17 . 0 4 . 3 1 . 8 2 . 5 3 . 6 w h 10 36 . 5 15 . 9 14 . 3 1 . 9 21 11 2 . 4 21 . 0 5 . 2 2 . 2 2 . 9 5 . 6 w h 25 51 1 19 . 8 18 . 3 2 . 8 28 15 3 . 3 29 . 0 7 . 2 2 . 6 4 . 3 13 w h 50 72 . 5 2 21 . 4 39 . 7 2 . 8 30 16 3 . 3 51 . 0 7 . 9 2 . 6 5 . 1 29 w h 100 , 2 0 0 & 300 a m ax b m ax c m ax d m ax e m ax f 0 . 3 g 0 . 3 h m ax j m ax k m ax l n o m 3 m m ax d t m i n w t . n o m w h 100 47 . 5 88 24 . 1 27 . 3 65 . 2 35 37 11 . 8 15 . 4 3 . 7 4 . 4 - 7 . 0 115 w h 200 72 . 5 145 . 7 41 . 8 45 . 5 89 . 7 70 57 . 2 20 . 5 10 . 4 5 . 5 5 . 1 103 . 4 15 475 w h 300 72 . 5 184 . 4 41 . 8 45 . 5 127 . 7 104 59 20 . 5 12 . 4 5 . 5 6 . 6 141 . 4 15 700 n o t e 1 : a m ax f o r w h 25t i s 7 1 . 3 n o t e 2 : a m ax f o r w h 50t i s 9 5 . 5 n o t e 3 : w h 100: 0 . 2 5 , w h 2 0 0 & 3 0 0 : 0 . 4 5 g e n e r a l n o t e w e l w y n c o m p o n ent s r e s e r v e s t h e ri g h t t o m a k e c h a ng e s i n p r oduc t s p e c i f i c a t i o n w i t h out n o t i c e o r l i a b i l i t y . a ll in f o r m a t i on i s s u bj e c t t o w e l w y n s o w n t e s t d a t a a n d i s c ons id e r e d a cc u r a t e a t t i m e o f p ri n t. ? w e l w y n c o m p o n e n t s l i m i t ed w e l w y n e l e c t r o n i cs p a r k , b e d l i n g t on, n o rt h u m b e r l and, n e 22 7 aa , e ngl a n d . t el: 0 16 70 8 2 2 18 1 f a x : 01 6 7 0 8 2 94 65 w e b : www. w e l w y n -t t . c om c o n s t r u c t i on cap and l ead a ss e m b li e s a re f i tt ed t o a h i gh pu ri t y ce ra mi c s ub s t ra t e . t he re s i s t i v e e l e m en t i s w ound on t o t he s u b s t ra t e an d w e l ded t o t he ca p s . t he w ou n d r od i s t hen m ou l ded and f i t t ed i n t o a l u mi n i u m hou s i ng t o g i ve op t i m u m s t ab i lit y and re l i abi l i t y. m a r k i ng t he re s i s t o rs a re l egend m a rk ed w i t h t y pe re f e r en ce , re s i s t an ce v a l ue and t o l e r an ce w h i ch w ill w i t h s t and a l l a cc ep t ed i ndu s t ri a l c l ean i ng f l u i d s . va l ue s a re m a rke d i n a cco r dan ce w i t h i ec 62 en d f a c e tr a c k in g d i s t anc e = d t w h100 w h200 & 300 w h5 , 10 , 25 & 50 sp a d e t e rm i n al o n w h 25t & w h 50t n o m i n a l d i m s in mm
aluminium housed wirewound resistors wh series www.bitechnologies.com www.irctt.com www.welwyn-tt.com 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 07. 12 alum i niu m h o u s e d w i r e w ound r e s i s t o r s p e r f o rm a n c e d a ta w h 5 , 1 0 , 2 5 & 50 w h 10 0 , 2 0 0 & 300 a ct u a l c e cc 4020 3 - 006 r e qu i r e m e n t s m a x i m u m t yp i c a l m a x i m u m load a t co mm e r c i a l r a t i n g : 100 0 h r s a t 25 c ? r % 1 1 0 . 4 2 load a t c e c c r a t i n g : 1 000h r s a t 25 c ? r % 1 1 0 . 4 n / a d r y h e a t : 1000 h r s a t 200 c ? r % 1 1 0 . 4 2 d e r a t i n g f r o m 25 c z e r o a t 200 c , s ee d e r a t i n g g r a ph s ho r t - t e r m o ve r l o ad ? r % 1 1 0 . 2 c l i m a t i c se qu e n ce ? r % 1 1 0 . 4 c l i m a t i c ca t e go r y 55 / 20 0 / 56 long - t e r m d a m p h e a t ? r % 1 0 . 5 0 . 2 t e m p e r a t u r e r ap i d c hang e ? r % 0 . 25 0 . 25 0 . 1 0 . 25 r e si st an ce t o so l d e r h e a t ? r % 0 . 25 0 . 25 0 . 05 w h 10 0 : 0 . 5 v i b r a t i o n an d b u m p ? r % 0 . 25 0 . 25 0 . 025 n o i se ( i n d e c ad e o f f r e qu e n cy) v / v n o t s p e ci f i e d 0 0 0 i n su l a t i o n r e si st an ce o h m s 1 g m i n 10 g m i n p u l se an d o ve r l oa d p e r f o r m an ce n o t s p e ci f i e d s e e g r aph s n o t e : a 0 . 0 5 ohm add i t i o n i s t o b e a dd ed t o t h e p e rf o r m anc e o f a l l r e s i s t o rs < 1 0 ohm s . a pp licat i o n n o t es a f t e r s o l de r i ng , ca re s hou l d be ta k en to en s u re t ha t th e re a re no f l u x re s i due s on t he end f a ce s o f t he m o u l d i n g co m pound , o t he rw i s e i n s u l a t i on re s i s t an ce w i l l be r ed u c ed . t he mi n i m u m s u rf a ce tra ck i ng d i s t an ce s f ro m te r mi na t i on t o ca s i ng a re s hown i n t he ph ys i c al dat a t ab l e s a s di m en s i on d t. it i s re co mm ended t ha t t he re s i s t o r ba s e s hou l d be c oa t ed th i n l y w i t h hea t s i n k co m pound b e f o re m oun t i n g to o b t a i n t he s t a t ed ope ra t i ng c ha ra c t e ri s t i cs . t he hea t s i n k co m p ound i n cr ea s e s t he rm a l c ondu ct i v i t y t o t he hea t s i n k . g e n e r a l n o t e w e l w y n c o m p o n ent s r e s e r v e s t h e ri g h t t o m a k e c h a ng e s i n p r oduc t s p e c i f i c a t i o n w i t h out n o t i c e o r l i a b i l i t y . a ll in f o r m a t i on i s s u bj e c t t o w e l w y n s o w n t e s t d a t a a n d i s c ons id e r e d a cc u r a t e a t t i m e o f p ri n t. ? w e l w y n c o m p o n e n t s l i m i t ed w e l w y n e l e c t r o n i cs p a r k , b e d l i n g t on, n o rt h u m b e r l and, n e 22 7 aa , e ngl a n d . t el: 0 16 70 8 2 2 18 1 f a x : 01 6 7 0 8 2 94 65 w e b : www . w e l w y n -t t . c om 1 10 0 .1 1 10 100 1000 o ve r lo a d d u r a t ion ( s) m u l ti p l e o f r a te d p o w e r w h 5 & 10 w h 100 - 300 w h 25 - 300 w h 5 - 50 0 .1 1 10 100 1000 1 0000 0 . 01 0 .1 1 10 100 1000 100 0 0 100000 v a l ue ( oh m s) e n e r g y ( j o u l e s ) w h5 w h 10 w h 25 w h 50 w h 100 w h 200 w h 300 p ul se a n d o ver l o a d p er fo rma n ce f o r s ho r t du r a t i on s o f 0 . 1 s t h e e n e r g y g r aph s ho u l d b e u se d . f o r l ong e r du r a t i on s t h e o ve r l oa d g r aph app l i e s. t e rm i n a t i o ns w h5- 100 ma t er i a l pb - f r ee s o l de r d i pped , c oppe r cl a d s t ee l st re ng th t he te r mi na t i on s m e e t t he r equ i re m en t s o f iec 68 . 2 . 21 so l d era b i lity t he te r mi na t i on s m e e t t he r equ i re m en t s o f iec 115 -1 , c l au s e 4 . 17 . 3 . 2 w h25t & 5 0t 6 .3 5 mm ( ? ) s pade te r m i n al w h200 & 300 ma t er i al m6 th r eaded s t ee l te r mi n a l w i t h a s e t o f f ou r nu t s and w a s h e rs st re ng th t e r mi na t i on r obu s t ne ss 50n m a x t i gh t e n i ng to r que 5 n m m a x
aluminium housed wirewound resistors wh series www.bitechnologies.com www.irctt.com www.welwyn-tt.com 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 07. 12 al u m i n i u m h o u s e d w i r e w ound r e s i s t o r s t h e s t and a rd a l u m i n i u m he a t s i n ks a re d e f i ne d i n t h e t a b l e b e l o w . i f s m a l l e r he a t s i n ks a re u s e d t he n d e ra t i n g s ho u l d b e ap p l i e d a s i n d i ca t e d i n t h e g r ap h b e l o w . i f n o he a t s i n k i s e m p l o ye d , u s e t h e ra t i n g s f o r 1 c m 2 . p acka g i n g w h 5 , 1 0 , 2 5 , 5 0 & 10 0 re s i s t o rs a re p a cke d i n p l a s t i c b a g s an d b o x e d . w h20 0 & 30 0 a re i nd i v idua l l y b o x e d . o r d e r i n g p r o c e d u r e ex a m p l e : w h2 5 w i t h s pad e t e rmi n a l s a t 10 0 o h m s w i t h a 5 % t o l e ra n ce : w h 2 5 t ? 1 0 0 r j i t yp e t e r mi n a t i o n s t and a r d t s pad e t e r m i n a l va l u e (u s e i e c6 2 c od e ) t o l e ra n ce (u s e i e c6 2 c od e ) f 1 % j 5 % g 2 % k 1 0 % pa cki n g t h e f o l l o w i n g o p t i o n s a p p l y t o w h 5 , 1 0 , 2 5 & 5 0 o n l y : f o r c ec c r e l e a s e d p r od u c t s t a t e o n o rd e r t h e c ec c n u m b e r a n d s t y l e . e x a m p l e : w h 2 5 - 3 k 3 j i c e c c 4 0 2 0 3 - 0 0 6 c a f o r s n p b f i n i s h i n s t e a d o f p b -f r e e r e p l a c e t h e p a c k i n g s u f f i x w i t h pb . e x a m p l e : w h 2 5 - 3 k 3 j pb t y p e ( c e c c ) t h i c k n e s s ( mm) a r e a ( c m 2 ) w h 5 ( a a ) 1 410 w h 1 0 ( b a ) 1 410 w h 2 5 ( c a ) 1 544 w h 5 0 ( d a ) 1 544 w h 5 0 @ 5 0 w 1 . 5 930 w h 100 3 1000 w h 200 3 3800 w h 300 3 5800 r e f er e n c e h e a ts i n k d i m e n s i o n s 1 1 0 10 0 1 00 0 1 1 0 10 0 1 00 0 1 000 0 h e a ts i n k su r fa c e a r e a (c m 2 ) m a x i m u m d i s s i p a t i o n ( w ) w h 1 0 / b a 7 0 c w h 1 0 / b a 2 5 c w h 5 / a a 7 0 c w h 5 / a a 2 5 c w h 2 5 / c a 7 0 c w h 2 5 / c a 2 5 c d a 7 0 c d a 2 5 c w h 5 0 2 5 c w h 1 0 0 7 0 c w h 1 0 0 2 5 c w h 2 0 0 7 0 c w h 2 0 0 2 5 c w h 3 0 0 7 0 c w h 3 0 0 2 5 c 0 2 0 4 0 6 0 8 0 1 0 0 1 2 0 0 1 0 0 2 0 0 a m b i e n t t e m p e r a t u r e ( c ) p r o p o r t i o n o f p r ( % ) der a t in g fo r r e d u c e d h e a ts i n k d i m e n s i o n s der a t in g fo r a m b i e n t te m p er a tu r e i wh5, 10, 25, 50 bulk 10/box standard WH100, 200, 300 1/box
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