? 2015 littelfuse, inc. specifcations are subject to change without notice. revised: 11/11/15 251/253 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 253 series agency file number 251 series ampere range n/a e10480 0.062a - 15a n/a 29862 0.062a - 15a ps e n/a jet1896-31007- 1004 1a - 5a n/a j50158379 0.500a - 10a qp l fm10 n/a 0.062a - 15a n/a 2009010207366577 0.500a, 1a, 2a, 2.5a, 3a, 4a, 5a features electrical characteristics for series % of ampere rating ampere rating opening time 100% 0.062a - 15a 4 hours, min. 200% 0.062a - 7a 1 second, max. 10a 3 seconds, max. 12 - 15a 10 seconds, max. 275% 0.500a, 1a, 2a, 2.5a, 3a, 4a, 5a, 7a, 10a 300 msecs., max. 400% 0.05a, 1a, 2a, 2.5a, 3a, 4a, 5a, 7a, 10a 30 msecs., max. 1000% 0.500a, 1a, 2a, 2.5a, 3a, 4a, 5a, 7a, 10a 4 msecs., max. applications ps e ? flatCpanel display tv ? lcd monitor ? lcd backlight inverter ? offce machines ? power supply ? audio/video system ? lighting system ? medical equipment secondary protection for space constrained applications qp l ? very fast-acting ? small size ? wide current rating range (0.062a- 15a) ? halogen-free available ? wide operating temperature range ? low temperature re-rating application testing is strongly recommended. additional information datasheet samples resources datasheet samples resources 251 series 253 series 251 series 253 series 251 series 253 series axial lead & cartridge fuses pico ? ll > very fast-acting fuse > 251/253 series
? 2015 littelfuse, inc. specifcations are subject to change without notice. revised: 11/11/15 electrical specifcations by item note: higher ampere ratings are available. please contact littelfuse technical support or your littelfuse products representative for assistance. 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 (v) agency approvals ps e tuv qp l .062 .062 251.062 253.062 125 300 a @ 125vdc 50a@125vac for ccc 7a: 70a@125vac for ccc 10a: 100a@ 125vac 7.000 0.000113 1. 4 x x x .125 .125 251.125 253.125 125 1.700 0.00174 0.285 x x x .200 .200 251.200 253.200 125 0.895 0.0048 0.345 x x .250 .250 251.250 253.250 125 0.665 0.0116 0.24 x x x .375 .375 251.375 253.375 125 0.395 0.0296 0.215 x x x .500 .500 251.500 253.500 125 0.302 0.0598 0.2165 x x x x x .630 .630 251.630 125 0.205 0.08 0.188 x x .750 .750 251.750 253.750 125 0.175 0.153 0.176 x x x x 1. 0 0 0 01. 251001. 253001. 125 0.128 0.256 0.194 x x x x x x 1.25 1.25 2511.25 125 0.100 0.390 0.2 x x x 1.50 01. 5 25101.5 25301.5 125 0.0823 0.587 0.21 x x x x x 2.00 002. 251002. 253002. 125 0.0473 0.405 0.141 x x x x x x 2.50 02.5 25102.5 125 0.0360 0.721 0.132 x x x x x 3.00 003. 251003. 253003. 125 0.0295 1. 19 0.131 x x x x x x 3.50 03.5 25103.5 125 0.0240 1.58 0.1205 x x x x 4.00 004. 251004. 253004. 125 0.0204 2.45 0.114 x x x x x x 5.00 005. 251005. 253005. 125 0.0158 4.14 0.11 x x x x x x 7. 0 0 0 0 7. 251007. 253007. 125 0.0107 10.4 0.102 x x x x 10.0 010. 251010. 253010. 125 0.0072 25.5 0.1 x x x x 12.0 012. 251012. 32 0.0059 45.2 0.0878 x x 15.0 015. 251015. 253015. 32 0.00446 68.8 0.071 x x x 300a@32vdc & 50a@32vac 253 series only axial lead & cartridge fuses pico ? ll > very fast-acting fuse > 251/253 series
? 2015 littelfuse, inc. specifcations are subject to change without notice. revised: 11/11/15 average time current curves soldering parameters 10 0 10 1 0.1 0.0 1 0.0 01 .062a 0.05 0.1 11 01 00 1 000 .1 25a .250a .375a .50 0a .750a .630a 1a 1 .5a 2a 2.5a 3a 3.5a 4a 5a 7a 10 a 12 a 15 a time in seconds current in amperes 1 .25a recommended hand soldering parameters: solder iron temperature: 350c +/- 5c heating time: 5 seconds max. note: these devices are not recommended for ir or convection refow process recommended process parameters: note: 1. re-rating depicted in this curve is in addition to the standard derating of 25% for continuous operation. temperature re-rating curve wave parameter lead-free recommendation for 251 series only 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 axial lead & cartridge fuses pico ? ll > very fast-acting fuse > 251/253 series
? 2015 littelfuse, inc. specifcations are subject to change without notice. revised: 11/11/15 materials encapsulated, epoxy-coated body: 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 7lbs. axial pull test) fuses to mil spec for fuses to mil-prf-23419, fm10 change the series number from 251 to 253 operating temperature C55oc to +125oc (consider re-rating) product characteristics vibration mil-std-202, method 201 (10C55 hz); method 204, test condition c (55C2000 hz at 10 gs peak) shock mil-std-202, method 213, test condition i (100 gs peak for 6 msecs.) insulation resistance (after opening): mil-std-202, method 302, test condition a (10,000 ohms minimum at 100 volts) moisture resistance mil-std-202, method 106 resistance to soldering heat withstands 60 seconds above 200 o c and up to 260oc, maximum flammability rating ul 94vC0 dimensions packaging part numbering system packaging option packaging specifcation quantity & packaging code *t1: 52.4mm (2.062") tape and reel eia 296 please refer to available quantities above in "part numbering system **t3: 73mm (2.874') tape and reel eia 296 0251 xxxx n r t1 lead length type of packaging quantity current rating series t he def ault lead length f or ammo pac k and l oose pac k is no w t1 f or 251 series, and remains t3 f or 253 series, theref ore: t1 = 52.4mm (2.062?), 251 series only* blank = 52.4mm (2.062?) f or 251 series* or 73mm (2.87 4?) f or 253 series** r = r eel a = ammo pa ck x = l oose pa ck n = 50 00 p = 20 00 m = 1 000 h = 10 0 re f er to amp code column of electrical speci?cations t able 251 = st andard t ype 253 = milit ar y t ype option codes l l = r ohs + hf (only applies to 251 series) the default lead length for both ammo pack and loose pack is t1 for 251 and is t3 for 253. notes: * t1 dimension is defned as the length of the component between the two tapes. the full component length is 62.7mm (2.468"). t1 length is for 251 series only. ** t3 dimension is defned as the length of the component between the two tapes. the full component length is 83.3.7mm (3.28). t3 length is for 253 series only. wire diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 15 am p wire diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 12-15 am p 2.61 (.103") max 6.35 (.25") tape 5.0 (.197") 6.35 (.25") tape 38.1 (1.5") 38.1 (1.5") 7.11 (.280") 83.31 (3.28") 253 series markings (t3 lead length) l 1 a l 1 a 73.0 (2.874")** l 1 a f l 1 a 27.78 (1.094") 27.78 (1.094") 7.11 (.280") 62.7 (2.468") 52.4 (2.062")* 2.80 (.11") max 6.35 (.25") tape 5.0 (.197") 6.35 (.25") tape 251 series (halogen-free version) markings (t1 lead length) wire diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 12-15 am p f l 1 a f l 1 a 27.78 (1.094") 27.78 (1.094") 7.11 (.280") 62.7 (2.468") 52.4 (2.062")* 2.80 (.11") max 6.35 (.25") tape 5.0 (.197") 6.35 (.25") tape 251 series markings (t1 lead length) f f f axial lead & cartridge fuses pico ? ll > very fast-acting fuse > 251/253 series
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