1 cartridge, axial lead, and socket fuses ?2008 littelfuse, inc. speci?cations are subject to change without notice. please refer to www.littelfuse.com for the most current information revised: april 23, 2008 251/253 series pico ? ii > very fast-acting > 251/253 series speci?cations are subject to change without notice. please refer to http://www.littelfuse.com/series/251.html or /253.html for current information. 251/253 series, pico ? ii, very fast-acting fuse description the pico ? ii very fast-acting fuse is designed to meet an extensive array of performance characteristics in a space-saving subminiature package. agency approvals agency agency file number ampere range ? e10480 62ma - 15a ? ps e jet 1896-31007-1001 1a - 5a tuv j02037794 500ma - 10a features electrical characteristics t 7 f s z g b t u b d u j o h t 4 n b m m t j [ f t 8 j e f d v s s f o u s b u j o h s b o h f (62ma- 15a) t 3 p ) 4 d p n q m j b o u t 8 j e f p q f s b u j o h temperature range t - p x u f n q f s b u v s f e f s b u j o h % of ampere rating ampere rating opening time 100% 1/16C15 4 hours, minimum 200% 1/16C7 1 sec., maximum 10 3 sec., maximum 12-15 10 sec., maximum applications ampere rating (a) amp code ordering number (std.) ordering number (mil.) max voltage rating (v) interrupting rating nominal cold resistance (ohms) nominal melting i 2 t (a 2 sec) nom voltage drop (mv) agency approvals ? ? ps e tuv 1/16 .062 251.062 253.062 125 300 amperes at rated voltage vdc 50 amperes at rated voltage vac 7.000 0.000113 1. 4 x x 1/8 .125 251.125 253.125 125 1.700 0.00174 0.285 x x 1/4 .250 251.250 253.250 125 0.665 0.0116 0.24 x x 3/8 .375 251.375 253.375 125 0.395 0.0296 0.215 x x 1/2 .500 251.500 253.500 125 0.280 0.0598 0.2165 x x x 3/4 .750 251.750 253.750 125 0.175 0.153 0.176 x x x 1 001. 251001. 253001. 125 0.128 0.256 0.194 x x x x 11/4 1.25 2511.25 125 0.100 0.390 0.2 x x x x 11/2 01.5 25101.5 25301.5 125 0.0823 0.587 0.21 x x x x 2 002. 251002. 253002. 125 0.0473 0.405 0.141 x x x x 21/2 02.5 25102.5 125 0.0360 0.721 0.132 x x x x 3 003. 251003. 253003. 125 0.0290 1.19 0.131 x x x x 31/2 03.5 25103.5 125 0.0240 1.58 0.1205 x x x x 4 004. 251004. 253004. 125 0.0204 2.45 0.114 x x x x 5 005. 251005. 253005. 125 0.0155 4.14 0.11 x x x x 7 007. 251007. 253007. 125 0.0105 10.4 0.102 x x x x 10 010. 251010. 253010. 125 0.00705 25.5 0.1 x x x x 12 012. 251012. 32 0.0055 45.2 0.0878 x x x 15 015. 251015. 253015. 32 0.00446 68.8 0.071 x x x electrical characteristics note: higher ampere ratings are available. please contact littelfuse technical support or your littelfuse products representat ive for assistance. rohs ? ps e t ' m b u 1 b o f m % j t q m b z 5 7 t - $ % n p o j u p s t - $ % c b d l m j h i u j o w f s u f s t 0 g m d f n b d i j o f t t 1 p x f s t v q q m z t " v e j p 7 j e f p t z t u f n t - j h i u j o h t z t u f n t . f e j d b m f r v j q n f o u secondary protection for space constrained applications tuv ?
2 cartridge, axial lead, and socket fuses ?2008 littelfuse, inc. speci?cations are subject to change without notice. please refer to www.littelfuse.com for the most current information revised: april 23, 2008 251/253 series pico ? ii > very fast-acting > 251/253 series speci?cations are subject to change without notice. please refer to http://www.littelfuse.com/series/251.html or /253.html for current information. average time current curves temperature rerating curve soldering parameters - wave soldering 100 10 1 0.1 0.01 0.001 1/16a 0.05 0.1 1 10 100 1000 1/8a 1/4a 3/8a 1/2a 3/4a 1a 1 1/2a 2a 2 1/2a 3a 3 1/2a 4a 5a 7a 10a 12a 15a time in seconds current in amperes 1 1/4a dwell t ime 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 0 10 20 30 40 5 0 60 70 80 90 100 110 120 130 140 1 5 0 160 170 180 190 200 210 220 230 240 t ime (seconds) t emperature (c) - measured on bottom side of board cooling t ime preheat t ime wave parameter lead-free recommendation preheat: (depends on flux activation temperature) (typical industry recommendation) temperature minimum: 100 c temperature maximum: 150 c preheat time: 60-180 seconds solder pot temperature: 260 c maximum solder dwell time: 2-5 seconds recommended hand-solder parameters: solder iron temperature: 350 c +/- 5c heating time: 5 seconds max. note: these devices are not recommended for ir or convection re?ow process. recommended process parameters:
3 cartridge, axial lead, and socket fuses ?2008 littelfuse, inc. speci?cations are subject to change without notice. please refer to www.littelfuse.com for the most current information revised: april 23, 2008 251/253 series pico ? ii > very fast-acting > 251/253 series speci?cations are subject to change without notice. please refer to http://www.littelfuse.com/series/251.html or /253.html for current information. materials encapsulated, epoxy-coated body: wire leads. pure tin coated copper wire leads solderability mil-std-202, method 208 lead pull force mil-std-202. method 211. test condition a (will withstand a 7 lb. axial pull test). moisture sensitivity level j-std 020 msl rating 2 product characteristics operating temperature C55 o c to 125 o c shock mil-std-202, method 213, test condition i (100 gs peak for 6 milliseconds) vibration mil-std-202, method 201 (10C55 ) [
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5 f t u $ p o e j u j p o $ o ) [ b u ( t 1 f b l
moisture resistance mil-std-202, method 106 resistance to soldering heat withstands 60 seconds above 200 o c and up to 260 o c, maximum flammability rating ul 94v0 f l f l 1 a f l 1 a 1 a 27.78 (1.094") 27.78 (1.094") 7.11 (.280") 62.7 (2.468") 52.4 (2.062")* 253 series markings 251 series markings **0.64 (.025") 2.80 (.11") 6.35 (.25") tape 5.0 (.197") 6.35 (.25") tape dimensions packaging part numbering system packaging option packaging speci?cation quantity & packaging code *t1: 52.4mm (2.062") tape and reel eia 296 1 m f b t f s f g f s u p b w b j m b c m f r v b o u j u j f t above in "part numbering system 0251 xxxx n r t1 l rohs lead length type of packaging quantity current rating series t1: 52.4mm (2.062)* r = reel a = ammo pack x = loose pack n = 5000 p = 2000 m = 1000 h = 100 v = 5 refer to amp code column of electrical characteristics table 251 = standard type 253 = military type / p u f t 5 e j n f o t j p o j t e f m o f e b t u i f m f o h u i p g u i f d p n q p o f o u c f u x f f o u i f u x p u b q f t 5 i f g v m m d p n q p o f o u m f o h u i j t n n
** .025 diameter for 1/16C10a, .032 diameter for 12C15a.
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