49 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 448 series nano 2? > very fast-acting > 448 series please refer to www.littelfuse.com/series/448.html for current information. 448 series 448 series fuse description the lead-free nano 2 smf fuse is a very small, square surface mount fuse that is rohs compliant, halogen free and 100% lead-free. this product is fully compatible with lead-free solder alloys and higher temperature profiles associated with lead-free assembly. agency approvals features ps e electrical characteristics for series % 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 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 t - f b e g s f f b o e ) b m p h f o free 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 s b u j o h b w b j m b c m f n " u p "
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 agency agency file number ampere range e10480 62ma - 15a lr29862 62ma - 15a ps e nbk030205 1a - 10a revised: december 17, 2010
introduction to circuit protection introduction to circuit protection transientology 50 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 448 series nano 2? > very fast-acting > 448 series please refer to www.littelfuse.com/series/448.html for current information. 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 50 amperes ! 7 " $ 7 % $ 300 amperes ! 7 % $ 1 4 & b n q f s f t ! 7 " $ 5.50 0.00023 x x 0.080 .080 125 4.42 0.00043 x x 0.100 .100 125 2.90 0.00082 x x 0.125 .125 125 2.58 0.00130 x x 0.160 .160 125 1.76 0.00280 x x 0.200 .200 125 1.40 0.00380 x x 0.250 .250 125 1.05 0.01520 x x 0.315 .315 125 0.7900 0.02650 x x 0.375 .375 125 0.7300 0.02400 x x 0.400 .400 125 0.4895 0.04160 x x 0.500 .500 125 0.3800 0.1 0000 x x 0.630 .630 125 0.2821 0.121 x x 0.750 .750 125 0.2475 0.206 x x 0.800 .800 125 0.1907 0.272 x x 1.00 001. 125 0.08630 0.441 x x x 1.25 1.25 125 0.06619 0.900 x x x 1.50 01.5 125 0.06514 0.900 x x x 1.60 01.6 125 0.06261 1.122 x x x 2.00 002. 125 0.03529 0.812 x x x 2.50 02.5 125 0.02934 1.156 x x x 3.00 003. 125 0.02445 1.720 x x x 3.15 3.15 125 0.02300 1.810 x x x 3.50 03.5 125 0.02100 2.300 x x x 4.00 004. 125 0.01577 3.970 x x x 5.00 005. 125 0.01531 4.490 x x x 6.30 06.3 125 0.01044 12.10 x x x 7.00 007. 125 0.00900 13.92 x x x 8.00 008. 125 0.00780 18.33 x x x 10.00 010. 125 35 amperes ! 7 " $ 50 amperes ! 7 % $ 300 amperes ! 7 % $ 1 4 & b n q f s f t ! 7 " $ 0.00700 28.00 x x x 12.00 012. 65 50 amperes ! 7 " $ 7 % $ 300 amperes ! 7 % $ 0.00533 47.59 x x 15.00 015. 65 0.00394 96.10 x x electrical specifications by item notes: - l 2 t calculated at 8ms. - resistance is measured at 10% of rated current, 25oc
51 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 448 series nano 2? > very fast-acting > 448 series please refer to www.littelfuse.com/series/448.html for current information. 448 series average time current curves reflow condition 1 c o ' s f f b t t f n c m z pre heat - temperature min (t s(min) ) ? $ - temperature max (t s(max) ) ? $ - time (min to max) (t s ) 60 C 120 secs average ramp up rate (liquidus temp (t l ) to peak ? $ t f d p o e n b y t s(max) to t l - ramp-up rate ? $ t f d p o e n b y reflow - temperature (t l ) (liquidus) ? $ - temperature (t l ) 60 C 90 seconds peak temperature (t p ) 250 +0/-5 ? $ time within 5c of actual peak temperature (t p ) 20 C 40 seconds ramp-down rate ? $ t f d p o e n b y time 25c to peak temperature (t p ) 8 minutes max. do not exceed ? $ wave soldering parameters ? $ 1 f b l temperature, 10 seconds max. soldering parameters temperature rerating curve 0.001 0.01 0.1 1 10 100 0 0 0 1 0 0 1 0 1 1 1 . 0 current in amps time in seconds .062 a .080 a .100 a .12 5 a .160 a .200 a .2 5 0 a .31 5 a .37 5 a .40 a . 5 0 a .63 a .7 5 a .80 a 1.00 a 1.2 5 a 1. 5 0 a 1.60 a 2.00 a 2. 5 0 a 3.00 a 3.1 5 a 3. 5 0 a 4.00 a 5 .00 a 6.30 a 7 a 8 a 10 a 12 a 1 5 a / p u f % 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. 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 52 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 448 series nano 2? > very fast-acting > 448 series please refer to www.littelfuse.com/series/448.html for current information. materials # p e z $ f s b n j d 5 f s n j o b u j p o t ( p m e q m b u f e $ b q t product marking # s b o e
" n q f s b h f 3 b u j o h operating temperature -55 o $ u p o $ 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 "
p i n t n j o j n v n
thermal shock . * - 4 5 %
. f u i p e
5 f t u $ p o e j u j p o #
d z d m f t
o $ u p 125 o $
n j o v u f t ! f b d i f y u s f n f 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 $ p o e j u j p o # i s t
resistance to soldering heat . * - 4 5 %
. f u i p e
5 f t u d p o e j u j p o # t f d b u o $
product characteristics 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 dimensions packaging part numbering system packaging option packaging specification quantity quantity & packaging code 12mm tape and reel & * " 3 4 * & $
q b s u
1000 mr 0448 001. m r series amp code * quantity code packaging code refer to electrical characteristics table m = 1000 pcs r = tape and reel *example: 1.5 amp product is 044801.5mr b n q q s p e v d u t i p x o b c p w f
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