31 revision: february 13, 2008 surface mount fuses ?2008 littelfuse, inc. speci?cations are subject to change without notice. please refer to www.littelfuse.com for the most current information thin film > 0603 size > very fast acting > 434 series 434 series 434 series fuse description agency approvals agency agency file number ampere range ? e10480 250ma - 3a ? lr29862 250ma - 3a electrical characteristics for series features t 5 i f 4 m j n - j o f fuse is an extremely small, low pro?le design (0603 chip size) utilizing thin-?lm technology to achieve precise control of electrical characteristics. t 5 i f m p x f s i f j h i u q s p m m f produces a ?at surface for improved performance in pick-and-place operations and an alternate solution for height critical applications. applications ? ? % of ampere rating opening time at 25 o c 100% 4 hours, minimum 200% 5 seconds, maximum. 300% 0.2 seconds, maximum the 434 series fast-acting surface mount fuse series is an ultra small (0603 size) thin-?lm device designed for secondary protection of circuits used in space constrained applications such as hand-held portable electronic devices. for rohs compliant and lead-free design, please refer to the littelfuse 467 series thin ?lm fuse. ampere rating (a) amp code max voltage rating (v) interrupting rating nominal cold resistance (ohms) nominal melting i 2 t (a 2 sec) agency approvals ? ? 0.250 .250 32 50a @32 v ac/dc 0.3750 0.0030 x x 0.375 .375 32 0.2650 0.0053 x x 0.500 .500 32 0.1903 0.0087 x x 0.680 .680 32 0.1250 0.0109 x x 0.750 .750 32 0.1140 0.0171 x x 1.00 001. 32 0.0720 0.0212 x x 1.25 1.25 32 35a @32 v ac/dc 0.0540 0.0320 x x 1.50 01.5 32 0.0480 0.0526 x x 1.75 1.75 32 0.0390 0.0661 x x 2.00 002. 32 0.0360 0.1040 x x 2.50 02.5 32 0.0280 0.1750 x x 3.00 003. 32 0.0230 0.1980 x x 3.50 03.5 32 0.0190 0.2650 x x 4.00 004. 32 0.0170 0.3520 x x 5.00 005. 32 0.0130 1.2970 x x electrical speci?cations by item 1. measured at 10% of rated current, 25oc. 2. measured at rated voltage. t $ f m m q i p o f t t # b u u f s z q b d l t t % j h j u b m d b n f s b t t % 7 % q m b z f s t t ) b s e e j t l e s j w f t secondary protection for space constrained applications such as:
32 revision: february 13, 2008 surface mount fuses ?2008 littelfuse, inc. speci?cations are subject to change without notice. please refer to www.littelfuse.com for the most current information thin film > 0603 size > very fast acting > 434 series 434 series average time current curves time in seconds current in amperes 0.01 0.1 0.1 1 1 10 100 10 100 0.001 3a 2.5a 2a 1.5a 1a .75a .5a .375a .25a 3.5a 4a 5a .68a re?ow 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 (liquidus temp (t l ) to peak 5c/second max t s(max) to t l - ramp-up rate 5c/second max re?ow - temperature (t l ) (liquidus) 217c - temperature (t l ) 60 C 150 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 ) 8 minutes max. do not exceed 260c soldering parameters - wave soldering temperature rerating curve
33 revision: february 13, 2008 surface mount fuses ?2008 littelfuse, inc. speci?cations are subject to change without notice. please refer to www.littelfuse.com for the most current information thin film > 0603 size > very fast acting > 434 series 434 series 1.09 (.043") reflow solder 1.60 (.063") .127 (.005") marking code varies with amperage rating (see chart) 1.02 (.040") .762 (.030") 2.54 (.100") 1.09 (.043") wave solder 3.20 (.126") 1.09 (.043") 1.02 (.040") .813 (.032") .305 (.012") .279 (.011") .254 (.010") sn/pb sn/pb cu sn/pb coating 0 4 3 4 1.7 5 nr amp code series quantity code materials body: epoxy substrate terminations: 100% tin over nickel over copper element cover coat: conformal coating operating temperature C 55 o c to 90 o c. consult temperature rerating curve chart. for operation above 90c contact littelfuse. humidity mil-std-202f method 103b condition d thermal shock withstands 5 cycles of C 55 o c to 125 o c vibration per mil-std-202f insulation resistance (after opening) greater than 10,000 ohms resistance to soldering heat withstands 60 seconds above 200 o c and up to 260 o c, maximum product characteristics dimensions packaging part numbering system part marking packaging option packaging speci?cation quantity quantity & packaging code 8mm tape and reel eia rs-481-2 (iec 286, part 3) 5000 nr amp code marking code .250 d .375 e .500 f .680 x .750 g 001. h 1.25 j 01.5 k 1.75 l 002. n 02.5 o 003. p 03.5 r 004. s 005. t
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