37 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses 468 series thin film > 1206 size > slo-blo ? > 468 series please refer to www.littelfuse.com/series/468.html for current information. 468 series 468 series fuse description agency approvals agency agency file number ampere range e10480 500ma - 3a lr29862 500ma - 3a electrical characteristics for series features ? complies with electronic industry environmental standards for lead reduction. ? product is compatible with lead-free solders and higher temperature profles. ? time delay feature withstands high inrush currents and prevents nuisance openings. ? package is visually distinct from fast- acting version for easy identifcation. ? top side marking allows visual verifcation of amperage rating. % of ampere rating opening time at 25 o c 100% 4 hours, minimum 200% 1 sec., min.; 120 sec., max. 300% 0.05 sec., min.; 1.5 sec., max 800% 0.0015 sec., min.; .05 sec., max. applications ampere rating (a) amp code max voltage rating (v) interrupting rating nominal cold resistance (ohms) nominal melting i 2 t (a 2 sec) nom voltage drop (mv) nom power dissipation (w) agency approvals 0.50 .500 63 50 amperes @63 vac/vdc 0.27000 0.0310 156.77 0.0784 x x 1.00 001. 63 0.08250 0.1270 94.70 0.0947 x x 1.50 01.5 63 0.04750 0.2880 82.32 0.1235 x x 2.00 002. 63 35 amperes @63 vac 50 amperes @63 vdc 0.03240 0.5060 77.27 0.1545 x x 2.50 02.5 63 0.02240 1.0110 73.92 0.1848 x x 3.00 003. 32 50 amperes @32 vac/vdc 0.01950 1.2700 72.95 0.2189 x x electrical specifcations by item 1. measured at 10% of rated current, 25?c. 2. measured at rated voltage. the 468 series time-lag (slo-blo ? ) smf is a small (1206 size) thin-flm device designed for secondary protection of circuits used in space constrained applications such as hand-held portable electronic devices. this series is 100% lead-free and meets the requirements of the rohs directive. new halogen-free 468 series fuses are availableCto order use the hf suffx. see part numbering section for additional information. ? cell phones ? battery packs ? digital cameras ? dvd players ? hard disk drives. secondary protection for space constrained applications: revised: october 4, 2011
introduction to circuit protection introduction to circuit protection transientology 38 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses 468 series thin film > 1206 size > slo-blo ? > 468 series please refer to www.littelfuse.com/series/468.html for current information. average time current curves 0.001 0.01 0.1 1 10 100 0 0 1 0 1 1 0 current in amperes ti me in seconds 3a 2a 2. 5a 1a 1. 5a .5 a temperature rerating curve refow 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 180 secs average ramp up rate ( l iquidus temp (t l ) to peak 5c/second max t s(max) to t l - ramp-up rate 5c/second max refow - 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 ramp-down rate 5c/second max time 25 c to peak temperature (t p ) 8 minutes max. do not exceed 260c soldering parameters 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
39 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses 468 series thin film > 1206 size > slo-blo ? > 468 series please refer to www.littelfuse.com/series/468.html for current information. 468 series materials body: epoxy substrate terminations: 100% tin over nickel over copper element cover coat: conformal coating operating temperature C55 o c to 90 o c. consult temperature rerating curve chart. for operation above 90c please contact littelfuse thermal shock withstands 5 cycles of C 50 o c to 125 o c humidity mil-std-202f, method 103b, condition d vibration withstands 10-55 hz per mil-std- 202f, method 201a and 10-2000 hz at 20 gs per mil-std- 202f, method 204d, condition d insulation resistance (after opening) greater than 10,000 ohms. resistance to soldering heat mil-std-202g, method 210f, condition d product characteristics dimensions part marking system marking code v aries with ampera ge ra ting (see char t) .58 (.023") coating .66 (.026") 2.03 (.080") 2.03 (.080") wa ve solder inf ared solder 3.81 (.150") 1.52 (.060") 1.14 (.045") 4.83 (.190") 1.65 (.065") 1.52 (.060") 3.18 (.125") 1.52 (.060") 1.27 (.050") part numbering system packaging packaging option packaging specifcation quantity quantity & packaging code tape & reel C 8mm tape eia-481 rev. d (iec 60286, part 3) 5000 nr amp code marking code .500 tf 001. th 01.5 tk 002. tn 02.5 to 003. tp 0468002.nrhf series amp c ode hf suffix halogen free item packa ging c ode the dot is poisitioned before the pack - aging suffx with whole ratings and within the numbering sequence for fractional ratings. refer to amp code column in the electrical specifcations table. nr = tape and reel, 5000 pcs example: 1.5 amp product is 0468 01.5 nrhf (2 amp product shown above).
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