? 2012 littelfuse, inc. speci?cations are subject to change without notice. surface mount fuses 449 series nano 2? > slo-blo ? > 449 series please refer to www.littelfuse.com/series/449.html for current information. 449 series 449 series fuse description the lead free nano 2 slo-blo ? fuse is rohs compliant, halogen free and 100% lead-free. this product is fully compatible with lead-free solder alloys and higher temperature pro?les associated with lead-free assembly. the slo-blo ? design has enhanced inrush withstand characteristics over the nano 2 fast-acting fuse. the unique time delay feature of this fuse design helps solve the problem of nuisance opening by accommodating inrush currents that normally cause a fast-acting fuse to open. agency approvals agency agency file number ampere range e10480 375ma - 5a ps e nbk030205 1a - 5a electrical characteristics for series features % of ampere rating opening time 100% 4 hours, minimum 20 0% 1 sec., min.; 60 sec., max. 300% 0.2 sec., min.; 3 sec., max 800% 0.02 sec., min.; 0.1 sec., max. electrical speci?cations 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 0.375 .375 125 50 amperes @125 vac/ vdc pse: 100 amperes @100 vac 1.5130 0.088 x 0.500 .500 125 0.7633 0.258 x 0.750 .750 125 0.4080 0.847 x 1.00 001. 125 0.2516 1.76 x x 1.50 01.5 125 0.1186 4.70 x x 2.00 002. 125 0.0708 6.76 x x 2.50 02.5 125 0.0400 13.18 x x 3.00 003. 125 0.0352 19.55 x x 3.50 03.5 125 0.0261 32.70 x x 4.00 004. 125 0.0227 40.80 x x 5.00 005. 125 0.0171 59.59 x x 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 m 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 secondary protection for space constrained applications: t - f b e g s f f b o e ) b m p h f o free t 4 m p # m p ? 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 ratings available 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 ps e ps e notes: - l 2 t calculated at 8ms. resistance is measured at 10% of rated current, 25oc revised: june 3, 2012
introduction to circuit protection introduction to circuit protection transientology ? 2012 littelfuse, inc. speci?cations are subject to change without notice. surface mount fuses 449 series nano 2? > slo-blo ? > 449 series please refer to www.littelfuse.com/series/449.html for current information. re?ow 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 3c/second max. t s(max) to t l - ramp-up rate 3c/second max. re?ow - 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 average time current curves temperature rerating curve time in seconds current in amperes 0.01 0.1 1 10 100 1000 0 1 10 100 3a 4a 5a 1.5a 1a .750a .500a .375a 2.5a 2a 3.5a note: 1. derating depicted in this curve is in addition to the standard derating of 25% for continuous operation. wave soldering parameters ? $ 1 f b l temperature, 3 seconds max. time temperature t p l s(max) s(min) 25 p l s imama (25a) amn am pa iian l p
? 2012 littelfuse, inc. speci?cations are subject to change without notice. surface mount fuses 449 series nano 2? > slo-blo ? > 449 series please refer to www.littelfuse.com/series/449.html for current information. 449 series 1 a t 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 f materials body: ceramic terminations: ( p m e q m b u f e $ b q t product marking brand, amperage rating 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 to 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 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 packaging option packaging speci?cation quantity quantity & packaging code 12mm tape and reel & * " 3 4 * & $
q b s u
1000 mr 0449 001. m r series amp code* quantity code packaging code refer to electrical charac- teristics table . q d t 3 5 b q f b o e 3 f f m *example: 0.375 amp product is 0449 .375mr (1 amp product shown above).
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