57 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 451/453 series nano 2? > very fast-acting > 451/453 series 451/453 series please refer to www.littelfuse.com/series/451.html or /453.html for current information. 451/453 series fuse description the nano 2 smf fuse is a very small, wire-in-air (wia) square shape surface mount fuse which is very suitable for the secondary side circuit over-current protection applications and is designed for pcb using surface mount technology. agency approvals agency agency file number ampere range e10480 6.3a - 15a lr29862 62ma - 15a ps e nbk030205-e10480b nbk101105-e184655 1a - 5a 6.3a - 10a e10480 62ma - 5a electrical characteristics for series features t 7 f s z g b t u b d u j o h t 4 n b m m t j [ f t 8 j e f s b o h f p g d v s s f o u rating available (62ma to 15a) t 8 j e f p q f s b u j o h temperature range t - p x u f n q f s b u v s f de-rating t 3 p ) 4 d p n q m j b o u t ) b m p h f o ' s f f % of ampere rating ampere rating opening time 100% 1/16 C15 4 hours, minimum 200% 1/16 C10 5 sec., maximum 12 C15 20 sec., maximum ps e applications t / p u f c p p l 1 $ t - $ % 1 % 1 5 7 t - $ % n p o j u p s t - $ % 1 % 1 q b o f m t - $ % c b d l m j h i u j o w f s u f s t 1 p s u b c m f % 7 % q m b z f s t 1 p x f s t v q q m z t / f u x p s l j o h t 1 $ t f s w f s t $ p p m j o h g b o t z t u f n t 4 u p s b h f t z t u f n t 5 f m f d p n t z t u f n t 8 j s f m f t t c b t f t u b u j p o t 8 i j u f h p p e t t ( b n f d p o t p m f t 0 g ? d f " v u p n b u j p o equipment t # b u u f s z d i b s h j o h d j s d v j u protection t * o e v t u s j b m f r v j q n f o u t . f e j d b m f r v j q n f o u t " v u p n p u j w f revised: june 1, 2009
introduction to circuit protection introduction to circuit protection transientology 58 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 451/453 series nano 2? > very fast-acting > 451/453 series please refer to www.littelfuse.com/series/451.html or /453.html for current information. electrical specifications by item ampere rating (a) amp code max voltage rating (v) interrupting rating nominal cold resistance (ohms) nominal melting i 2 t (a 2 sec) agency approvals ps e 0.062 .062 125 b n q f s f t ! 7 " $ 7 % $ b n q f s f t ! 7 % $ pse: 100 amperes ! 7 " $ 5.5000 0.00019 x x 0.080 .080 125 4.0500 0.00033 x x 0.100 .100 125 3.1000 0.00138 x x 0.125 .125 125 1.7000 0.00286 x x 0.160 .160 125 1.2157 0.0048 x x 0.200 .200 125 0.8372 0.0089 x x 0.250 .250 125 0.5765 0.0158 x x 0.315 .315 125 0.3918 0.0311 x x 0.375 .375 125 0.6100 0.0425 x x 0.400 .400 125 0.5600 0.0484 x x 0.500 .500 125 0.4200 0.0795 x x 0.630 .630 125 0.3050 0.143 x x 0.750 .750 125 0.2450 0.185 x x 0.800 .800 125 0.2120 0.271 x x 1.00 001. 125 0.1530 0.459 x x x 1.25 1.25 125 0.0780 0.664 x x x 1.50 01.5 125 0.0630 0.853 x x x 1.60 01.6 125 0.0580 1.060 x x x 2.00 002. 125 0.0367 0.530 x x x 2.50 02.5 125 0.0286 1.029 x x x 3.00 003. 125 0.0227 1.650 x x x 3.15 3.15 125 0.0215 1.920 x x x 3.50 03.5 125 0.0200 2.469 x x x 4.00 004. 125 0.0160 3.152 x x x 5.00 005. 125 0.0125 5.566 x x x 6.30 06.3 125 0.0096 9.170 x x x 7.00 007. 125 0.0090 10.32 x x x 8.00 008. 125 0.0077 20.23 x x x 10.0 010. 125 b n q f s f t ! 7 " $ b n q f s f t ! 7 % $ b n q f s f t ! 7 % $ pse: 100 amperes ! 7 " $ 0.0056 26.46 x x x 12.0 012. 65 b n q f s f t ! 7 " $ 7 % $ b n q f s f t ! 7 % $ 0.0049 47.97 x x 15.0 015. 65 0.0037 97.82 x x notes: - l 2 t calculated at 8ms. - resistance is measured at 10% of rated current, 25oc
59 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 451/453 series nano 2? > very fast-acting > 451/453 series 451/453 series please refer to www.littelfuse.com/series/451.html or /453.html for current information. average time current curves reflow condition pb C free assembly pre heat - temperature min (t s(min) ) 150c - temperature max (t s(max) ) 200c - time (min to max) (t s ) 60 C 120 secs average ramp up rate (liquidus temp (t l ) to peak 5c/second max. t s(max) to t l - ramp-up rate 5c/second max. reflow - temperature (t l ) (liquidus) 217c - temperature (t l ) 60 C 90 seconds peak temperature (t p ) 250 +0/-5 c time within 5c of actual peak temperature (t p ) 20 C 40 seconds ramp-down rate 5c/second max. time 25c to peak temperature (t p ) 8 minutes max. do not exceed 260c soldering parameters temperature rerating curve 100 10 1 0.1 0.01 0.001 .062a .125a .250a .375a .500a .750a 1a 1.5a 2a 2.5a 3a 3.5a 4a 5a 7a 10a 12a 15a 0.05 0.1 1 10 100 1000 time in seconds current in amperes 8a .160a .200a .315a note: % f s b u j o h e f q j d u f e j o u i j t d v s w f j t j o b e e j u j p o u p u i f t u b o e b s e e f s b u j o h p g g p s continuous operation. wave soldering parameters ? $ 1 f b l temperature, 10 seconds max. time temperature t p t l t s(max) t s(min) 25 t p t l t s time to peak temperature (t 25oc to peak) ramp-down ramp-up preheat critical zone t l to t p
introduction to circuit protection introduction to circuit protection transientology 60 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 451/453 series nano 2? > very fast-acting > 451/453 series please refer to www.littelfuse.com/series/451.html or /453.html for current information. materials body: ceramic terminations 5 j o - f b e " m m p z rohs compliant terminations: ( p m e q m b u f e $ b q t t f s j f t
silver-plated caps (453 series) product marking # s b o e
" n q f s f 3 b u j o h operating temperature -55c to 125c moisture sensitivity level - f w f m
+ 4 5 % $ solderability . * - 4 5 %
. f u i p e insulation resistance (after opening) . * - 4 5 %
. f u i p e
5 f t u $ p o e j u j p o a (10,000 ohms minimum) thermal shock . * - 4 5 %
. f u i p e
5 f t u condition b, 5 cycles, -65c / +125c, 15 minutes @ each extreme mechanical shock . * - 4 5 %
. f u i p e
5 f t u * % f f o f s h j [ f e ( t q l b n q m j u v e f
sawtooth wave 6ms duration, 3 d z d m f t 9 : ; y z [ t i p d l t vibration . * - 4 5 %
. f u i p e w b n q m j u v e f
) [ j o n j o i s t f b d i 9 : ; i s t moisture resistance . * - 4 5 %
. f u i p e
d z d m f t salt spray . * - 4 5 %
. f u i p e
5 f t u condition b (48hrs) resistance to soldering heat . * - 4 5 %
. f u i p e
5 f t u condition b (10 sec at 260c) product characteristics dimensions packaging part numbering system f 7 a 6.86 (.270") 3.15 (.124") 2.95 (.116") 1.96 (.077") 2.69 (.106") 2.69 (.106") 1.45 (.057") 6.10 (.240") recommended pad layout packaging option packaging specification quantity quantity & packaging code n n 5 b q f b o e 3 f f m & * " 3 4 * & $
q b s u
5000 / 3 n n 5 b q f b o e 3 f f m & * " 3 4 * & $
q b s u
1000 . 3 0451 001. m r l series amp code quantity code packaging code 3 f g f s u p & m f d u s j d b m characteristics table . q d t / q d t 3 5 b q f b o e 3 f f m rohs compliant & halogen free ( p m e 1 m b u f e $ b q t 4 j m w f s 1 m b u f e $ b q t note: l suffix applies to 451 series only t f s j f t n b z c f p s e f s f e b t f j u i f s i 3 p ) 4 b o e ) ' w i - w t v g ? y
p s o p o 3 p ) 4 o p t v g ? y
w f s t j p o t f s j f t j t b w b j m b c m f p o m z b t 3 p ) 4 d p n q m b j o u w f s t j p o b o e e p f t o p u s f r v j s f i - w t v g ? y 1 m f b t f e p o p u j o d m v e f i - w t v g ? y x j u i j o t f s j f t p s e f s j o h j o t u s v d u j p o t
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