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| ? 2012 littelfuse, inc. speci?cations are subject to change without notice. axial lead & cartridge fuses 251/253 series please refer to www.littelfuse.com/series/251.html or /253.html for current information. pico ? ll > very fast-acting > 251/253 series 251/253 series revised: september 6, 2012 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 lr 29862 62ma - 15a ps e jet 1896-31007-1001 1a - 5a tuv j50158379 500ma - 10a qp l fm10 62ma - 15a 2009010207366577 C 500ma to 5a 500ma, 1a, 2a, 2.5a, 3a, 4a, 5a features electrical characteristics for series % of ampere rating ampere rating opening time 100% 62ma - 15a 4 hours, min. 20 0% 62ma - 7a 1 second, max. 10a 3 seconds, max. 12 - 15a 10 seconds, max. 275% 500ma, 1a, 2a, 2.5a, 3a, 4a, 5a, 7a, 10a 300 msecs., max. 400% 500ma, 1a, 2a, 2.5a, 3a, 4a, 5a, 7a, 10a 30 msecs., max. 1000% 500ma, 1a, 2a, 2.5a, 3a, 4a, 5a, 7a, 10a 4 msecs., max. applications ps e t ' m b u o q b o f m e 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 4 f d p o e b s z q s p u f d u j p o g p s t q b d f d p o t u s b j o f e b q q m j d b u j p o t tuv qp l 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 range (62ma- 15a) t 3 p ) 4 d p n q m j b o u t ) b m p h f o g s f f b w b j m b c m f 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 rerating
? 2012 littelfuse, inc. speci?cations are subject to change without notice. axial lead & cartridge fuses 251/253 series please refer to www.littelfuse.com/series/251.html or /253.html for current information. pico ? ll > very fast-acting > 251/253 series 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 @ rated w p m u b h f % $ 50 a @ rated w p m u b h f " $ for ccc 7a: 70 a @ rated w p m u b h f " $ for ccc 10a: 100 a @ rated w p m u b h f " $ 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 .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 0.280 0.0598 0.2165 x x x x x .630 .630 251.630 125 0.205 0.094 0.188 x x .750 .750 251.750 253.750 125 0.175 0.153 0.176 x x x x 1.00 001. 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 0.0290 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 0.0155 4.14 0.11 x x x x x x 7.00 007. 251007. 253007. 125 0.0105 10.4 0.102 x x x x 10.0 010. 251010. 253010. 125 0.00705 25.5 0.1 x x x x 12.0 012. 251012. 32 0.0055 45.2 0.0878 x x 15.0 015. 251015. 253015. 32 0.00446 68.8 0.071 x x x electrical speci?cations by item note: ) j h i f s b n q f s f s b u j o h t b s f b w b j m b c m f 1 m f b t f d p o u b d u - j u u f m g v t f 5 f d i o j d b m 4 v q q p s u p s z p v s - j u u f m g v t f q s p e v d u t s f q s f t f o u b u j w f g p s b t t j t u b o d f ? 2012 littelfuse, inc. speci?cations are subject to change without notice. axial lead & cartridge fuses 251/253 series please refer to www.littelfuse.com/series/251.html or /253.html for current information. pico ? ll > very fast-acting > 251/253 series 251/253 series average time current curves soldering parameters 100 10 1 0.1 0.01 0.001 .062a 0.05 0.1 1 10 100 1000 .125a .250a .375a .500a .750a .630a 1a 1.5a 2a 2.5a 3a 3.5a 4a 5a 7a 10a 12a 15a time in seconds current in amperes 1.25a wave parameter lead-free recommendation preheat: % f q f o e t p o ' m v y " d u j w b u j p o 5 f n q f s b u v s f 5 z q j d b m * o e v t u s z 3 f d p n n f o e b u j p o 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 soldering parameters: 4 p m e f s * s p o 5 f n q f s b u v s f ? $ ? $ heating time: 5 seconds max. note: these devices are not recommended for ir or convection re?ow process recommended process parameters: note: 1. rerating depicted in this curve is in addition to the standard rerating of 25% for continuous operation. temperature rerating curve ? 2012 littelfuse, inc. speci?cations are subject to change without notice. axial lead & cartridge fuses 251/253 series please refer to www.littelfuse.com/series/251.html or /253.html for current information. pico ? ll > very fast-acting > 251/253 series materials & o d b q t v m b u f e & q p y z $ p b u f e body: 1 v s f 5 j o d p b u f e $ p q q f s x j s f m f b e t solderability . * - 4 5 % . f u i p e lead pull force . * - 4 5 % . f u i p e 5 f t u $ p o e j u j p o " x j m m x j u i t u b o e b m c t b y j b m q v m m u f t u fuses to mil spec 4 f s j f t j t b w b j m b c m f j o ' . p o qpl for mil-prf-23419. to order, change 251 to 253 product characteristics operating temperature o ? $ u p ? $ shock . * - 4 5 % . f u i p e 5 f t u condition i (100 gs peak for 6 msecs.) vibration . * - 4 5 % . f u i p e o ) [ . f u i p e 5 f t u $ p o e j u j p o $ o ) [ b u ( t 1 f b l moisture resistance . * - 4 5 % . f u i p e resistance to soldering heat 8 j u i t u b o e t t f d p o e t b c p w f o c and up to 260oc, maximum flammability rating ul 94vC0 dimensions packaging part numbering system packaging option packaging speci?cation quantity & packaging code 5 n n 5 b q f b o e 3 f f m 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 5 n n h 5 b q f b o e 3 f f m eia 296 0251 xxxx n r t1 l lead length type of packaging quantity current rating series the default lead length for ammo pack and loose pack is now t1 for 251 series, and remains t3 for 253 series, therefore: t1 = 52.4mm (2.062), 251 series only* blank = 52.4mm (2.062) for 251 series* or 73mm (2.874) for 253 series** r = reel a = ammo pack x = loose pack n = 5000 p = 2000 m = 1000 h = 100 refer to amp code column of electrical specifications table 251 = standard type 253 = military type option codes l = rohs + hf 5 i f e f g b v m u m f b e m f o h u i g p s c p u i b n n p q b d l b o e m p p t f q b d l j t 5 g p s b o e j t 5 g p s / 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 t1 length is for 251 series only. 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 w t3 length is for 253 series only. wire diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 15 amp wire diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 12-15 amp 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 (rohs version) markings (t3 lead length) l l 73.0 (2.874")** l l 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 (rohs and halogen-free version) markings (t1 lead length) wire diameter: 0.64 (.025") for 0.62-10.0 amp, 0.81 (.032") for 12-15 amp f l l 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 (rohs version) markings (t1 lead length) f f f |
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