33 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses 429 series thin film > 1206 size > very fast-acting > 429 series please refer to www.littelfuse.com/series/429.html for current information. 429 series 429 series fuse description the 429 series fast-acting 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 halogen-free, lead-free and meets the requirements of the rohs directive. agency approvals agency agency file number ampere range e 10480 7a lr29862 7a electrical characteristics for series features ? rohs compliant and lead-free 7a device available-add l suffx to part number. ? halogen-free 7a device available-add hf suffx to the part number ? for new designs up to 5a please consult the 433 or 466 series % of ampere r ating opening time at 25 o c 100% 4 hours, minimum 200% 5 sec., maximum 300% 0.2 sec., maximum applications 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) agency approvals 7.00 007. 24 35 amperes @ voltage, vac/vdc 0.00925 3.6000 x x electrical specifcations by item 1. measured at 10% of rated current, 25oc. 2. measured at rated voltage. ? 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 34 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses 429 series thin film > 1206 size > very fast-acting > 429 series please refer to www.littelfuse.com/series/429.html for current information. average time current curves 7 a ti m e i n sec o n d s curre nt i n am per es 0. 01 0. 1 0. 1 1 1 10 10 0 10 10 0 0. 00 1 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 180 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
35 ? 2009 littelfuse, inc. specifcations are subject to change without notice. surface mount fuses 429 series thin film > 1206 size > very fast-acting > 429 series please refer to www.littelfuse.com/series/429.html for current information. 429 series materials body: epoxy substrate terminations, rohs compliant device (429l): 100% tin over nickel over copper element cover coat: conformal coating note: do not use alcohol-based cleaners or solvents with 429 series thin-film fuses as it may damage the coating. operating temperature C 55 o c to 90 o c. consult temperature rerating chart. for operation above 90c contact littelfuse. thermal shock withstands 5 cycles of C 55 o c to 125 o c humidity mil-std-202f, method 103b condition d vibration withstands 10 C 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 re fl ow so ld er re co mme nde d p ad la yo ut s 3. 81 ( . 150" ) 1. 52 ( . 060" ) 2. 03 ( . 080" ) . 635 ( . 025" ) 1. 14 ( . 045" ) 2. 49 ( . 098" ) re f. 1. 52 ( . 060" ) 3. 18 ( . 125" ) 1. 14 ( . 045" ) 1. 12 ( . 044" ) re f. part numbering system packaging part marking system p ackaging option p ackaging specifcation quantity quantity & p ackaging code tape & reel C 8mm tape eia-481 rev. d (iec 60286, part 3) 3000 wrm series marking code 429l 7 0429 007. wrm l hf series amp code qu antit y code l = l ead-free device and rohs compliant device refer to amp code column of electrical characteristics table wrm = 3000 pieces, tape and reel h alogen-free item
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