1 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses please refer to www.littelfuse.com/series/440.html for current information. 440 series ceramic fuse > 440 series 440 series 440 series, 1206 high i 2 t fuse description the 440 series is a 100% lead-free, rohs compliant and halogen-free fuse series designed specifcally to provide over-current protection to circuits that operate under high working ambient temperatures up to 150oc and high inrush currents. the general design ensures excellent temperature stability and performance reliability. this high i 2 t fuse series is designed to have ultra high inrush current withstand capability to avoid nuisance fuse open. agency approvals agency agency file number ampere range e 10480 .25a - 8a lr 29862 .25a - 8a features electrical characteristics for series ? operating temperature from -55oc to +150oc ? 100% lead-free, rohs compliant and halogen- free ? suitable for both leaded and lead-free refow / wave soldering ? ultra high i 2 t values % of ampere r ating ampere r ating opening time at 25o c 100% 0.25a - 8a 4 hours, minimum 350% 0.25a - 8a 5 secs., maximum applications ampere r ating (a) amp code max. voltage r ating (v) i nterrupting r ating (a c/dc) 1 nominal r esistance (ohms) 2 nominal melting i 2 t (a 2 sec.) 3 n ominal voltage drop at r ated c urrent (v) 4 nominal p ower dissipation at r ated c urrent (w) agency approvals 0.25 .250 125 50 a @ 125 v ac/dc 2.140 0.00649 0.5260 0.132 x x 0.375 .375 125 1.216 0.01455 0.4993 0.187 x x 0.5 .500 63 50 a @ 63 v ac/dc 0.8140 0.02642 0.4831 0.242 x x 0.75 .750 63 50 a @ 63 v ac/dc 0.4624 0.09312 0.3983 0.299 x x 1 0 01. 50 50 a @ 50 v dc 50 a @ 50 v ac 0.3096 0.21054 0.3457 0.346 x x 1.25 1.25 50 0.2268 0.40200 0.3240 0.405 x x 1.5 01.5 50 0.1759 0.50652 0.3215 0.482 x x 1.75 1.75 32 50 a @ 32 v ac/dc 0.04518 0.3312 0.0777 0.136 x x 2 002. 32 0.03802 0.4326 0.0792 0.158 x x 2.5 02.5 32 0.02850 0.8191 0.0747 0.187 x x 3 003. 32 0.02252 1.232 0.0742 0.223 x x 3.5 03.5 32 0.01845 1.789 0.0757 0.265 x x 4 004. 32 0.01553 2.601 0.0709 0.284 x x 5 005. 32 0.01164 4.761 0.0654 0.327 x x 7 007. 32 0.00753 8.464 0.0696 0.487 x x 8 008. 32 0.00634 12.95 0.0655 0.524 x x electrical specifcations by item notes: 1. ac interrupting rating tested at rated voltage with unity power factor. dc interrupting rating tested at rated voltage with time constant < 0.8 msec. 2. nominal resistance measured with < 10% rated current. 3. nominal melting i2t measured at 1 msec. opening time. 4. nominal voltage drop measured at rated current after temperature has stabilized. ? automotive electronics ? lcd displays ? servers ? notebook computers ? printers ? scanners ? data modems ? hard disk drives devices designed to carry rated current for 4 hours minimum. it is recommended that devices be operated continuously at no more than 80% rated current. see temperature derating curvefor additional derating information. devices designed to be mounted with marking code facing up. revised: june 23, 2011
introduction to circuit protection introduction to circuit protection transientology 2 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses please refer to www.littelfuse.com/series/440.html for current information. 440 series ceramic fuse > 440 series average time current curves 0.001 0.1 1.0 10.0 100.0 1000. 0.01 0.1 1 10 100 time in seconds current in amperes r efow condition pb-free assembly p re heat - temperature min (t s(min) ) 150c - temperature max (t s(max) ) 200c - time ( min to max) (t s ) 60 180 seconds average r amp-up r ate (l iquidus temp (t l ) to peak) 3c/second max. t s(max) to t l - r amp-up r ate 5c/second max. r efow - temperature (t l ) (liquidus) 21c - temperature (t l ) 60 150 seconds p eak temperature (t p ) 260 0/-5 c time within 5 c of actual peak temperature (t p ) 10 30 seconds r amp-down r ate 6c/second max. time 25 c to peak temperature (t p ) 8 minutes max. do not exceed 260c soldering parameters temperature derating curve 40 60 80 10 0 12 0 14 0 -6 5 -45 -25 -5 15 35 55 75 95 115 135 15 5 te m per at ur e ( c) pe rc en t of ra ti ng ti me te mperature 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 example: wave soldering 260c 10 seconds max.
3 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses please refer to www.littelfuse.com/series/440.html for current information. 440 series ceramic fuse > 440 series 440 series materials body: advanced ceramic terminations: ag / ni / sn (100% lead-free) element cover coating: lead-free glass moisture sensitivity level ipc/jedec j-std-020c, level 1 solderability ipc/eca/jedec j-std-002b, condition c humidity test mil-std-202, method 103b, conditions d resistance to solder heat mil-std-202, method 210f, condition b product characteristics moisture resistance mil-std-202, method 106g thermal shock mil-std-202, method 107g, condition b mechanical shock mil-std-202, method 213b, condition a vibration mil-std-202, method 201a vibration, high frequency mil-std-202, method 204d, condition d dissolution of metallization ipc/eca/jedec j-std-002c, condition d terminal strength iec 60127-4 dimensions 3.200 .1778 [.126 .007] 1.000 [.039] x 1.500 [.059] 1.800 [.071] 3.500 [.138] 1.000 [.039] .8179 +.046/ -.076 [.0322 +.0018/ -.003] 0.520 .200 [.020 .008] termina tion 1.63 + .10/ -.20 [.064 + .004/ -.008] packaging part marking system p ackaging option p ackaging specication quantity quantity p ackaging code 8mm tape and reel eia-481, iec 60286, part 3 3000 wr part numbering system 0440 008. w r series amp code qu antit y code w = 3000 pcs pac king code r = reel pack .250 d .375 e .500 f .750 g 0 01. h 1.25 j 01.5 k 1.75 l 002. n 02.5 o 003. p 03.5 r 004. s 005. t 007. w 008. x
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