99 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 157t series nano 2? > 157t fuse and holder combination please refer to www.littelfuse.com/series/157t.html for current information. 157t series 157t series C standard nano fuse and clip assembly description the 157t series fuse/clip assembly is a small, square, time-lag, surface mount fuse that is assembled in surface mountable fuse clips. 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. the fuse clip and pre-installed fuse combination can be automatically placed in pc board in one efficient manufacturing operation. it permits quick and easy replacement of fuses without performing desoldering process, even in the field and without exposing the pc board to detrimental effects of rework solder heat. agency approvals agency agency file number ampere range e14721 0.375a ~ 5a ps e nbk030205-e10480a nbk030205-e10480b 1a 1.5a-5a features electrical characteristics for series t 4 v s g b d f . p v o u b c m f
time-lag fuse. t ' v m m z d p n q b u j c m f x j u i rohs/pb-free solder alloys and higher temperature profiles associated with leadfree assembly. t & b t j m z s f q m b d f b c m f on pc board (field replaceable) t 3 p ) 4 $ p n q m j b o u b o e halogen-free t " w b j m b c m f j o s b u j o h t p g _ " n q f s f t % of ampere rating % of ampere rating opening time at 25oc 100% " _ " i p v s t
. j o j n v n 200% " _ " t f d . j o j n v n
t f d t . b y j n v n 300% " _ " t f d t . j o j n v n
t f d t . b y j n v n 800% " _ " t f d t . j o j n v n
t f d t . b y j n v n applications ampere rating (a) amp code max voltage rating (v) interrupting rating (a) fuse furnished nominal cold resistance (ohms) nominal melting i 2 t (a 2 sec) agency approvals ps e 0.375 .375 125 " ! 7 " $ 7 % $ 0454.375 1.2214 0.101 x 0.500 .500 125 0454.500 0.7047 0.240 x 0.750 .750 125 0454.750 0.3602 0.904 x 1.00 001 125 0454001. 0.2245 1.98 x x 1.50 01.5 125 045401.5 0.0934 3.65 x x 2.00 002 125 0454002. 0.0629 8.20 x x 2.50 02.5 125 045402.5 0.0452 15.0 x x 3.00 003 125 0454003. 0.0342 20.16 x x 3.50 03.5 125 045403.5 0.0226 26.53 x x 4.00 004 125 0454004. 0.0188 34.40 x x 5.00 005 125 0454005. 0.0138 53.72 x x electrical specifications by item 1. cold resistance measured at less than 10% of rated current at 23oc. 2. i 2 t values stated for 8ms opening time. " h f o d z " q q s p w b m 5 b c m f , f z 9 " q q s p w f e p s $ f s u j ? f e
1 1 f o e j o h b o e # m b o l / p u " q q s p w f e 4. have special electrical characteristic needs? contact littelfuse to learn more about application specific options t * o t u s v n f o u b u j p o t t # b t f 4 u b u j p o t t 5 f m f d p n n v o j d b u j p o t ps e revised: february 19, 2010
introduction to circuit protection introduction to circuit protection transientology 100 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 157t series nano 2? > 157t fuse and holder combination please refer to www.littelfuse.com/series/157t.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 ) n j o v u f t . b y do not exceed 260c soldering parameters temperature rerating curve 0.001 0.01 0.1 1 10 100 0.1 1 10 100 current in amps time in seconds .37 5 a . 5 0a .7 5 a 1.0a 3.0a 2. 5 a 2.0a 1. 5 a 3. 5 a 4a 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
101 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 157t series nano 2? > 157t fuse and holder combination please refer to www.littelfuse.com/series/157t.html for current information. 157t series materials body: ceramic cap: ' p s " _ " o 4 j m w f s q m b u f e # s b t t clip plating: . b u u f 5 j o product marking body: brand logo, current rating, t for time-lag clip retention force applied at fuse center, perpendicular to u i f m p o h b y j t ! m c t . * /
solderability . * - 4 5 %
. f u i p e * 1 $ & * " + & % & $ + 4 5 % #
5 f t u $ p o e j u j p o " humidity test . * - o 4 5 %
. f u i p e ! ? $ 3 )
1000 hours resistance to solvents . * - 4 5 %
. f u i p e t p m w f o u u z q f t
product characteristics operating temperature -55oc to 125oc with proper derating thermal shock . * - 4 5 %
. f u i p e
test condition b (5 cycles -65oc to +125oc) vibration . * - 4 5 %
. f u i p e (10-55 hz) moisture resistance . * - 4 5 %
. f u i p e
10 cycles salt spray/ atmosphere . * - 4 5 %
. f u i p e
5 f t u $ p o e j u j p o # i s t
/ b $ m j o % f j p o j [ f e 8 b u f s shock . * - 4 5 %
. f u i p e
test condition i (100 gs peak for 6 milliseconds) dimensions 6.10 [0.240] 1. 4 5 [0.0 5 7] 2.69 [0.106] 2.69 [0.106] 3.7 0.13 [0.146] l 1 a f 6. 5 0 0.20 [0.2 5 6] t 3.90 0.13 [0.1 5 4] 2. 5 0 0.2 [0.098] 3.70 [0.146] 3.40 [0.134] "a" "b" 0.10 7.26 [0.29] 3.00 [0.12] 2.46 [0.10] 2.40 [0.09] packaging packaging option packaging specification quantity quantity & packaging code tape and reel 4 v s g b d f . p v o u 1500 % 3 5 part numbering system 0157 005. d r t series amp code quantity code packing option % q d t 3 5 b q f b o e 3 f f m pcb recommendation for thermal management . j o j n v n $ p q q f s - b z f s 5 i j d l o f t t v n . j o j n v n $ p q q f s 5 s b d f 8 j e u i n n / p u f " m u f s o b u f n f u i p e t p g u i f s n b m n b o b h f n f o u n b z c f v t f e * o t v d i d b t f t
v o e f s o p s n b m operations, the maximum temperature of the fuse body should not exceed 80oc in a 25oc ambient environment. time-lag fuse
introduction to circuit protection introduction to circuit protection transientology 102 ? 2009 littelfuse, inc. specifications are subject to change without notice.
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