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| revised: march 11, 2009 ? 2009 littelfuse, inc. specifications are subject to change without notice. axial lead & cartridge fuses 491 series ec3051v1e-0902-cust please refer to www.littelfuse.com for current information. pico ? ll > very fast-acting > 491 series 491 series 491 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 125ma - 10a lr 29862 125ma - 10a ps e jet 1896-31007-1001 1a - 5a 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 range (125ma - 10a) 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 e f rating % of ampere rating ampere rating opening time 100% 1/8-10 ) p v s t
min. 300% 1/8-10 4 f d p o e t
max. applications ampere rating (a) amp code ordering number (std.) max voltage rating (v) interrupting rating nominal cold resistance (ohms) agency approvals ps e .125 0.125 0491.125 125 50a at 125vac and vdc 1.7000 x x .200 0.200 0491.200 125 0.8950 x x .250 0.250 0491.250 125 0.6650 x x .315 0.315 0491.315 125 0.5000 x x .400 0.400 0491.400 125 0.3230 x x .500 0.500 0491.500 125 0.3020 x x .630 0.630 0491.630 125 0.2050 x x .750 0.750 0491.750 125 0.1750 x x .800 0.800 0491.800 125 0.1480 x x 1.00 001. 0491 001. 125 0.1280 x x x 1.25 1.25 0491 1.25 125 0.1000 x x x 1.50 01.5 0491 01.5 125 0.0823 x x x 1.60 01.6 0491 01.6 125 0.0700 x x x 2.00 002. 0491 002. 125 0.0473 x x x 2.50 02.5 0491 02.5 125 0.0360 x x x 3.00 003. 0491 003. 125 0.0295 x x x 3.15 3.15 0491 3.15 125 0.0275 x x x 3.50 03.5 0491 03.5 125 0.0240 x x x 4.00 004. 0491 004. 125 0.0204 x x x 5.00 005. 0491 005. 125 0.0158 x x x 7.00 007. 0491 007. 86 0.0107 x x 10.00 010. 0491 010. 86 0.0072 x x electrical characteristics 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 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 ? 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
revised: march 11, 2009 introduction to circuit protection introduction to circuit protection transientology ? 2009 littelfuse, inc. specifications are subject to change without notice. axial lead & cartridge fuses 491 series ec3051v1e-0902-cust please refer to www.littelfuse.com for current information. pico ? ll > very fast-acting > 491 series average time current curves temperature rerating curve soldering parameters 1000 100 10 1 0.1 0.01 1000 100 10 1 0.1 .25a .125a .2a .375a .4a .5a .63a .75a .8a 1a 1.25a .315a 1.5a 1.6a 2a 2.5a 3a 3.15a 3.5a 4a 5a time in seconds current in amperes 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 5 f n q f s b u v s f . j o j n v n 100 c 5 f n q f s b u v s f . b y j n v n 150 c preheat time: 60-180 seconds solder pot temperature: 260 $ . b y j n v n solder dwell time: 2-5 seconds recommended hand-solder parameters: 4 p m e f s * s p o 5 f n q f s b u v s f ? $ ? $ ) f b u j o h 5 j n f t f d p o e t n b y note: these devices are not recommended for ir or convection reflow process. recommended process parameters: note: % f s b u j o h e f q j d u f e j o u i j t d v s w f j t j o b e e j u j p o u p u i f t u b o e b s e e f s b u j o h p g g p s continuous operation. revised: march 11, 2009 ? 2009 littelfuse, inc. specifications are subject to change without notice. axial lead & cartridge fuses 491 series ec3051v1e-0902-cust please refer to www.littelfuse.com for current information. pico ? ll > very fast-acting > 491 series 491 series materials & o d b q t v m b u f e & q p y z $ p b u f e # p e z 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 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 n j m m j t f d p o e t 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 260 ? $ n b y j n v n flammability rating 6 - 7 o wire diameter: 0.64 (.025") 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 491 series (rohs and halogen-free version) markings (t1 lead length) wire diameter: 0.64 (.025") f l 0.5 f l f l f l 0.5 0.5 0.5 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 491 series (rohs version) markings (t1 lead length) dimensions packaging part numbering system packaging option packaging specification 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 b c p w f j o 1 b s u / v n c f s j o h 4 z t u f n w 0491 xxxx n r t1 hf series lead length the default lead length for ammo pack and loose pack is now t1 t1 = 52.4mm (2.062) type of packaging r = reel a = ammo pack quantity n = 5000 m = 1000 current rating refer to amp code column of electrical characteristics table option codes blank = rohs hf = rohs and halo g en-free / p u f t 5 e j n f o t j p o j t e f ? 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 revised: march 11, 2009 introduction to circuit protection introduction to circuit protection transientology ? 2009 littelfuse, inc. specifications are subject to change without notice. |
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