dimensions (mm) and weight (g) t ype l d d 1 k w eight max max max min wrm 0102 2.2 1.1 1.1 0.35 0.01 wrm 0204 3.6 1.4 1.4 0.5 0.02 wrm 0207 6.0 2.2 2.2 1.1 0.08 melf resistors wrm series ? high r eliability ? pr edictable pulse handling capability ? t olerances down to 0.1% ? tcr down to 5 ppm/c 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 wrm 0102 wrm 0204 wrm 0207 4 . 0 5 2 . 0 2 . 0 s t t a w c 0 7 t a g n i t a r r e w o p 2 m 8 ? 2 2 r m 0 1 ? 2 2 r 1 2 m 2 ? 2 2 r s m h o e g n a r e c n a t s i s e r 0 5 2 0 0 2 0 5 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 0 5 , 5 2 0 5 , 5 2 , 5 1 , 5 0 5 , 5 2 , 5 1 c / m p p r c t 5 , 2 , 0 . 1 , 5 . 0 , 5 2 . 0 , 1 . 0 % e c n a r e l o t e c n a t s i s e r standar d values e24 & e96 0 4 1 0 0 2 0 5 2 w / k e c n a d e p m i l a m r e h t 5 2 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 0 1 > s m h o e c n a t s i s e r n o i t a l u s n i 10 electrical data physical data 07. 08 a subsidiary of tt electr onics plc w el wyn components l k l 1 d d 1 construction a metal film is deposited onto a high dissipation ceramic former to which tin plated teminating caps ar e fitted. the r esistor is adjusted to value by a helical cut in the film and the body is pr otected by a lacquer coating. marking resistance values are colour coded with four bands, three indicating value and one indicating the multiplier. (note this describes standard marking, but certain values may still be supplied with the addition of a tolerance band following the multiplier.) t erminations material plated steel cap. solderability the pur e tin finish pr oduces ageing fr ee contacts on which low melting solders can be used. dipped ar ea shall be cover ed with a smooth and bright solder coating after 3 seconds immersion at 215c. solvent resistance the body pr otection and marking ar e r esistant to all normal industrial cleaning solvents suitable for printed cir cuit boar ds.
melf resistors wrm 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 07. 08 w el wyn components tcr and t olerance range * tc 10ppm & 5ppm is specified over the temperatur e range -10c to +85c. * resistors to be mounted on a pc-boar d accor ding to iec 115-1, clause 4.27.1 performance data e c n a r e l o t r c t e p y t refer ence 5% 2% 1.0% 0.5% 0.25% 0.1% wrm0102 50ppm r22 ? r91 iro ? 9r1 10r ? 2.21m 47rs ? 221k 100r ? 221k ? wrm0102 25ppm ? ? 10r ? 221k 47r5 ? 221k 100r ? 221k 100r ? 100k wrm0102 15ppm ? ? ? 100r ? 100k 100r ? 100k 100r ? 100k wrm0102 10ppm ? ????? wrm0102 05ppm ? ????? wrm0204 50ppm r22 ? r91 ? 1r ? 10m 10r ? 475k 22r ? 332k 43r ? 332k wrm0204 25ppm ? ? 10r ? 475k 10r ? 475k 22r ? 332k 43r ? 332k wrm0204 15ppm ? ? ? 10r ? 221k 22r ? 221k 43r ? 221k wrm0204 10ppm ? ??? 22r ? 221k 43r ? 221k wrm0204 05ppm ? ??? 100r ? 100k 100r ? 100k wrm0207 50ppm r22 ? r91 ? 1r ? 8.2m 10r ? 1m ? ? wrm0207 25ppm ? ? ? 10r ? 1m ? ? wrm0207 15ppm ? ????? wrm0207 10ppm ? ????? wrm0207 05ppm ? ????? t est results ? r/r stability class 0 . 1 5 . 0 5 2 . 0 n o i t p i r c s e d 10 ? <75 0.22 ? <10 75 ? <100 k >100 k ? 332 k >332 k ? 10 m short time overload* 0.05% + 0.01 0.1% + 0.01 0.25% + 0.05 bending test* 0.05% + 0.01 0.1% + 0.01 0.25% + 0.05 resistance to soldering heat 0.05% + 0.01 0.1% + 0.01 0.25% + 0.05 t emperatur e rapid change 0.05% + 0.01 0.1% + 0.01 0.25% + 0.05 endurance* load life 1000h 0.25% + 0.05 0.25% + 0.05 0.5% + 0.05 8000 h 0.5% + 0.05 0.5% + 0.05 1.0% + 0.05 climatic sequence* 0.25% + 0.05 0.5% + 0.05 1.0% + 0.05 damp heat steady state* 0.25% + 0.05 0.5% + 0.05 1.0% + 0.05 v / v 3 < v / v 5 2 . 0 < v / v 5 0 . 0 < e s i o n t n e r r u c h t o o m s a h t i w d e r e v o c e b l l a h s a e r a d e p p i d y t i l i b a r e d l o s and bright solder coating of at least 96% 0 1 . 5 . 0 < t n e i c i f f e o c e g a t l o v 6 /v f o o r p e g a t l o v 200v 300v 500v
melf resistors wrm 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 07. 08 w el wyn components 100 10 1 0,1 10 s 100 s 1 ms 10 ms 100 ms 1 s 10 s pulse duration t i pulse load p max wrm 0102 wrm 0204 wrm 0207 w 100 10 1 0,1 10 s 100 s 1 ms 10 ms 100 ms 1 s 10 s pulse duration t i continuous pulse load p max wrm 0102 wrm 0204 wrm 0207 w single pulse maximum pulse load continuous pulses maximum pulse load t ype wrm 0204 c - 1k0 f i size tcr v alue (use iec62 code) t olerance (use iec62 code) packing c 50ppm/oc t 10ppm/oc d 25ppm/oc v 5ppm/oc y 15ppm/oc b 0.1% d 0.5% g 2% c 0.25% f 1% j 5% 0102 3000 / r eel (7?) i t ape 0204 3000 / r eel (7?)* standar d 0207 1500 / r eel (7?) o r dering p r ocedur e example: wrm0204 at 1 kilohm, 1% tolerance and 50ppm/oc tcr on a r eel of 3000 pieces - * high pr ecision parts may be supplied on 1000 piece r eels ? please enquir e packaging the wrm 0102 and 0204 r esistors ar e supplied r eeled on 8mm blister tape. wrm 0207 r esistors ar e supplied on 12mm blister tape. packaging complies with the r equir ements of iec 286-3.
|
