45 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses 435 series thin film > 0402 size > very fast-acting > 435 series please refer to www.littelfuse.com/series/435.html for current information. 435 series 435 series fuse description agency approvals agency agency file number ampere range e 10480 0.250 - 5.0a lr 29862 0.250 - 5.0a electrical characteristics for series features ? 35a interrupt rating at 32vdc ? small size with current ratings of 0.25 to 5.0 amperes ? rohs compliant, lead- free and halogen-free ? maximum protection of sensitive circuits as fuses are designed to open consistently in <5sec at 200% overload. ? enhanced breaking capacity, high l 2 t % of ampere r ating ampere r ating opening time at 25 o c 100% 0.250a - 5a 4 hours, minimum 200% 0.375a - 5a 5 secs., maximum 300% 0.250a 5 secs., maximum 300% 0.375a - 5a 0.2 sec., maximum ampere r ating (a) amp code max voltage r ating (v) i nterrupting r ating nominal cold r esistance (ohms) nominal melting i 2 t (a 2 sec) nom voltage drop (mv) nom p ower dissipation (w) agency approvals 0.250 .250 32 35a @32v dc 0.2265 0.0025 60.67 0.01517 x x 0.375 .375 32 0.1930 0.0035 84.64 0.03174 x x 0.500 .500 32 0.1600 0.0053 93.35 0.04668 x x 0.750 .750 32 0.1050 0.0120 101.84 0.07638 x x 1.00 001. 32 0.0730 0.0200 87.45 0.08745 x x 1.25 1.25 32 0.0600 0.0350 96.37 0.12046 x x 1.50 01.5 32 0.0470 0.0560 86.70 0.13005 x x 1.75 1.75 32 0.0390 0.0750 81.13 0.14198 x x 2.00 002. 32 0.0300 0.1000 70.62 0.14120 x x 2.50 02.5 32 0.0185 0.1560 55.25 0.13813 x x 3.00 003. 32 0.0165 0.2032 60.58 0.18740 x x 3.50 03.5 32 0.0135 0.3017 57.84 0.20244 x x 4.00 004. 32 0.0115 0.3084 57.00 0.22800 x x 5.00 005. 32 0.0085 0.5310 52.44 0.26220 x x electrical specifcations by item 1. measured at 10% of rated current, 25oc. 2. measured at rated voltage. the 435 series are fast-acting surface mount thin-flm fuses. their ultra-small size (0402 size) makes them ideal for secondary protection of circuits used in space constrained applications such as hand-held portable electronic devices. this series is 100% lead-free and meet the requirements of the rohs directive. new halogen-free 435 series fuses are availableCto order use the hf suffx. see part numbering section for additional information. applications ? cell phones ? battery packs ? digital cameras ? dvd players ? hard disk drives. secondary protection for space constrained applications such as: revised: jun 16, 2011
introduction to circuit protection introduction to circuit protection transientology 46 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses 435 series thin film > 0402 size > very fast-acting > 435 series please refer to www.littelfuse.com/series/435.html for current information. average time current curves 0.001 0.01 0.1 1 10 100 0.1 1.0 10.0 100.0 time in seconds current in amperes 1.5a 1.25a 1.75a 2a 2.5a 3a 3.5a 4a 5a 1a .25a .375 a .5 a .75a r efow condition pb C free assembly p re 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 ( l iquidus temp (t l ) to peak 5c/second max t s(max) to t l - r amp-up r ate 5c/second max r efow - temperature (t l ) (liquidus) 217c - temperature (t l ) 60 C 150 seconds p eak temperature (t p ) 250 +0/-5 c time within 5 c of actual peak temperature (t p ) 20 C 40 seconds r amp-down r ate 5c/second max time 25 c to peak temperature (t p ) 8 minutes max. do not exceed 260c soldering parameters temperature rerating curve wave soldering 260c, 10 seconds max. note: 1. derating depicted in this curve is in addition to the standard derating of 25% for continuous operation. example: for continuous operation at 70 degrees celsius, the fuse should be deratedas follows: i = (0.75)(0.80)i rat = (0.60)i rat 2. the temperature derating curve represents the nominal conditions. for questions about temperature derating curve, please consult littelfuse technical support for assistance. 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
47 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses 435 series thin film > 0402 size > very fast-acting > 435 series please refer to www.littelfuse.com/series/435.html for current information. 435 series refer to amp code column in the electrical specifcations table. the dot is positioned at the end of the number sequence with whole ratings and within for fractional ratings. example: 1.5 amp product is 0435 01.5krhf (2 amp product shown) materials body: epoxy / glass substrate; parts with hf suffx: halogen free epoxy / glass terminations: 100% tin over nickel over copper device weight: 0.316mg terminal strength mil-std-202f, method 211a, test condition a insulation resistance after opening: greater than 10,000ohms operating temperature C55c to 90c. consult temperature rerating curve chart. for operation above 90c please contact littelfuse. thermal shock withstands 5 cycles of C55c to 125c vibration mil-std-202f product characteristics .558 (.022") r e ow solder recommended mounting pad dimensions .991 +/- .051 (.039" +/- .002") mark ing code varies with amperage . ref er to p ar t mark ing system char t. c u .508 +/- .051 (.020" +/- .002") .229 +/- .102 (.009" +/- .004") 0.330 +/- .102 (.013" +/- .004") .381 (.015") 1.55 (.061") .584 (.023") 0.292 +/- .102 (.012" +/- .004") .2159 +/- .0889 (.0085" +/- .0035") sn a b c d dimensions packaging part numbering system part marking system p ackaging option p ackaging specifcation quantity quantity & p ackaging code 8mm tape and reel eia-481 rev. d (iec 60286, part 3) 10000 kr a b c d inch min 0.037 0.018 0.008 0.005 inch max 0.041 0.022 0.016 0.012 mm min 0.94 0.457 0.190 0.127 mm max 1.04 0.559 0.394 0.305 0435 002. k r hf s series amp code hal ogen free item s - for .250a only packa ging code r = tape and reel qu antit y code k = 10,000 pieces amp code marking code .250 .375 .500 .750 001 . 1.25 01. 5 1.75 002 . 02.5 003 . 03.5 004 . 005 . x
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