 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| varistor products ?2010 littelfuse, inc. revision: january 10, 2011 sm7 series varistor surface mount varistors > sm7 series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/sm7.html for current information. sm7 series rohs description the littelfuse sm7 series is a plastic-encapsulated surface-mount metal oxide varistor (mov) transient voltage surge suppressor that is designed to be operated continuously across ac power lines. the series comprises a nylon molded package with tin plated lead frame for soldering to board. the surface mount sm7 series is based on radial 7mm internal varistor element with similar characteristics to the littelfuse la / za series of varistor. features t & m f d u s j d b m f r v j w b m f o u to leaded types la/za series t " $ 7 p m u b h f 3 b u j o h 7 u p 7 " $ s n t t / p % f 3 b u j o h v q u p ? $ b n c j f o u t ( p p e t p m e f s b c j m j u z t " w b j m b c m f j o u b q f and reel t " q q m j d b u j p o p g " $ power meters agency approvals absolute maximum ratings t ' p s s b u j o h t p g j o e j w j e v b m n f n c f s t p g b t f s j f t
t f f % f w j d f 3 b u j o h t b o e 4 q f d j m d b u j p o t d i b s u agency agency file number & continuous sm7 series units steady state applied voltage: " $ 7 p m u b h f 3 b o h f 7 . " $ 3 . 4 ) u p v % $ 7 p m u b h f 3 b o h f 7 . % $ ) u p v transients: peak pulse current (i tm ) ' p s t $ v s s f o u 8 b w f 4 f f ' j h v s f a 4 j o h m f 1 v m t f & o f s h z 3 b o h f ' p s s current wave (w tm ) u p j 0 q f s b u j o h " n c j f o u 5 f n q f s b u v s f 3 b o h f 5 a ) u p o c 4 u p s b h f 5 f n q f s b u v s f 3 b o h f 5 4 5 ( ) u p o c 5 f n q f s b u v s f $ p f g m d j f o u b v ) of clamping voltage (v c b u 4 q f d j m f e 5 f t u $ v s s f o u %/ o c ) j 1 p u & o d b q t v m b u j p o $ 0 " 5 * / ( * t p m b u j p o 7 p m u b h f $ b q b c j m j u z % j f m f d u s j d n v t u x j u i t u b o e j o e j d b u f e % $ w p m u b h f g p s p o f n j o v u f q f s . * - 4 5 % . f u i p e v $ 0 " 5 * / ( * o t v m b u j p o 3 f t j t u b o d f m caution: stresses above those listed in absolute maximum ratings may cause permanent damage to the device. this is a stress o nly rating and operation of the device at these or any other conditions above those indicated in the operational sections of this s peci?cation is not implied. sm7 varistor series varistor products ?2010 littelfuse, inc. revision: january 10, 2011 sm7 series varistor surface mount varistors > sm7 series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/sm7.html for current information. / 0 5 & 4 . t f s j f t e f w j d f t b s f s f d p h o j [ f e v o e f s 6 - m m f & sm7 series ratings & speci?cations maximum rating (85c) speci?cations (25c) continuous transient varistor voltage at 1ma dc test current maximum clamping voltage 8 x 20 s typical capacitance f = 1mhz v 3 . 4 v % $ energy 10 x 1000 s peak current 8 x 20 s part number v m(ac) v . % $ w tm i tm v nom min v nom max v c i pk c (v) (v) (j) (a) (v) (v) (v) (a) (pf) 7 4 . 7 4 . 7 4 . 7 4 . 7 4 . 7 4 . 7 4 . 7 4 . ' p s b q q m j d b u j p o t f y d f f e j o h ? $ b n c j f o u u f n q f s b u v s f u i f q f b l surge current and energy ratings must be reduced as shown below peak pulse current test waveform for clamping voltage peak current, energy and power derating curve = virtual origin of wave 5 5 j n f g s p n u p p g 1 f b l t 3 j t f 5 j n f y 5 t % f d b z 5 j n f example ' p s b o t $ v s s f o u 8 b w f g p s n 8 s = t 3 j t f 5 j n f s = t % f d b z 5 j n f percent of peak value test 0 5 0 100 tim e t 1 t t o 1 pulse rating curves 1 10 100 1000 10000 10 100 1000 10000 impulse duration (s) surge current (a) 1 2 10 10 2 10 3 10 4 10 5 10 6 / 0 5 & if pulse ratings b s f f y d f f e f e b t i j g u p g v / % $ b u t q f d j m f e d v s s f o u p g n p s f u i b o ? d p v m e s f t v m u 5 i j t u z q f p g t i j g u x i j d i o p s n b m m z s f t v m u t j o b e f d s f b t f p g v / % $ n b z s f t v m u j o u i f e f w j d f o p u n f f u j o h u i f p s j h j o b m q v c m j t i f e t q f d j m d b u j p o t c v u j u e p f t o p u q s f w f o u u i f e f w j d f g s p n d p o u j o v j o h u p g v o d u j p o b o e u p q s p w j e f b n q m f q s p u f d u j p o v-i limit curves 0 500 1000 1500 2000 0.001 0.01 0.1 1 10 100 1000 current(a) voltage(v) v510sm7 v480sm7 V460SM7 v420sm7 v385sm7 v320sm7 v300sm7 100 90 80 70 60 50 40 30 20 10 0 -55 50 60 70 80 90 100 110 120 130 140 150 ambient temperature ( o c) percent of rated value varistor products ?2010 littelfuse, inc. revision: january 10, 2011 sm7 series varistor surface mount varistors > sm7 series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/sm7.html for current information. sm7 series lead (pb) soldering recommendations 5 i f q s j o d j q b m u f d i o j r v f t v t f e g p s u i f t p m e f s j o h p g d p n q p o f o u t j o t v s g b d f n p v o u u f d i o p m p h z b s f * 3 3 f n p x b o e 8 b w f t p m e f s j o h 5 z q j d b m q s p m m f t b s f t i p x o p o u i f s j h i u 5 i f u f s n j o b m t p g 4 . t f s j f t e f w j d f t b s f u j o q m b u f e d p q q f s b o e u i f s f d p n n f o e f e t p m e f s j t 4 o 1 c " h 4 o 1 c p s 4 o 1 c - j u u f m g v t f b m t p s f d p n n f o e t b o 3 . " t p m e f s n v y wave soldering is the most strenuous of the processes. to avoid the possibility of generating stresses due to u i f s n b m t i p d l b q s f i f b u t u b h f j o u i f t p m e f s j o h q s p d f t t j t s f d p n n f o e f e b o e u i f q f b l u f n q f s b u v s f p g u i f t p m e f s process should be rigidly controlled. 8 i f o v t j o h b s f n p x q s p d f t t d b s f t i p v m e c f u b l f o u p ensure that the sm7 chip is not subjected to a thermal h s b e j f o u t u f f q f s u i b o e f h s f f t q f s t f d p o e u i f j e f b m h s b e j f o u c f j o h e f h s f f t q f s t f d p o e % v s j o h u i f t p m e f s j o h q s p d f t t q s f i f b u j o h u p x j u i j o e f h s f f t p g u i f t p m e f s h t q f b l u f n q f s b u v s f j t f t t f o u j b m u p n j o j n j [ f u i f s n b m t i p d l 0 o d f u i f t p m e f s j o h q s p d f t t i b t c f f o d p n q m f u f e j u j t still necessary to ensure that any further thermal shocks are avoided. one possible cause of thermal shock is hot printed circuit boards being removed from the solder process and subjected to cleaning solvents at room temperature. the boards must be allowed to cool gradually u p m f t t u i b o ? $ c f g p s f d m f b o j o h leadCfree (pb-free) soldering recommendations 5 i f u f s n j o b m t p g 4 . t f s j f t e f w j d f t b s f u j o q m b u f e d p q q f s b o e u i f s f d p n n f o e f e - f b e g s f f t p m e f s j t 4 o " h $ v x j u i b o 3 . " n v y u i p v h i u i f s f j t b x j e f t f m f d u j p o p g q b t u f t b o e n v y f t b w b j m b c m f u i b u t i p v m e c f compatible. 5 i f s f n p x q s p m m f n v t u c f d p o t u s b j o f e c z u i f n b y j n v n t j o u i f - f b e o g s f f 3 f n p x 1 s p m m f ' p s - f b e o g s f f 8 b w f t p m e f s j o h u i f 8 b w f 4 p m e f s 1 s p m m f t u j m m b q q m j f t / p u f u i f - f b e o g s f f q b t u f n v y b o e q s p m m f x f s f v t f e g p s f w b m v b u j p o q v s q p t f t c z - j u u f m g v t f c b t f e v q p o j o e v t u s z standards and practices. there are multiple choices of all u i s f f b w b j m b c m f j u j t b e w j t f e u i b u u i f d v t u p n f s f y q m p s f t u i f optimum combination for their process as processes vary considerably from site to site. preheat zone preheat dwell ramp rate <2c/s maximum temperature 230c temperature c time (minutes) 250 200 150 100 50 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 40-80 seconds above 183c time (minutes) 300 250 200 150 100 50 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 maximum wave 260c second preheat first preheat temperature c maximum temperature 250?c, time within 5?c of peak 20 seconds maximum preheat zone ramp rate <3?c/s 60 - 150 sec > 217?c temperature c time (minutes) 300 250 200 150 100 50 0 0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 re?ow solder pro?le wave solder pro?le leadCfree re-?ow solder pro?le varistor products ?2010 littelfuse, inc. revision: january 10, 2011 sm7 series varistor surface mount varistors > sm7 series speci?cations are subject to change without notice. please refer to www.littelfuse.com/series/sm7.html for current information. part numbering system for varistor v m(ac) (three digits -- 275v to 510v) v 275 sm7 sm7 series tape & reel speci?cations mm w ? t ? a0 ? b0 ? k0 ? e ? f ? p0 ? p1 ? p2 ? d0 ? d1 ? all dimensions shown in milimeters 3.00.3 1.50.3 0.3 max 6.5 13.1 3.5 soldering pad layout 11.50.3 8.30.3 6.00.3 product dimensions / 0 5 & 4 " m m e j n f o t j p o t q f s & * " d q j u d i f t d v n v m b u j w f u p m f s b o d f p o u b q f ? n n 2 v b o u j u z q f s j o d i n n s f f m q d t a-a b-b a0 11.30 b0 3.60 t 120 r1 ?210.8 20.5 ?130.2 detail h detail h ?330 ?100 16.5 21.50.4 5 2 k0 plastic reel carrier tape 5 6.2 10 f e w p1 d0 p0 p2 d1 b a b a |
Price & Availability of V460SM7
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |