1 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 494 series thin film > 0603 size > fast-acting > 494 series please refer to www.littelfuse.com/series/494.html for current information. 494 series 494 series fuse, nra special series integrated circuit protector description agency approvals agency agency file number ampere range ? e10480 250ma - 5a lr29862 250ma - 5a electrical characteristics for series features t $ p n q b u j c m f x j u i m f b e g s f f t p m e f s t b o e i j h i f s u f n q f s b u v s f q s p ? m f t t ) j h i q f s g p s n b o d f n b u f s j b m t q s p w j e f j n q s p w f e q f s g p s n b o d f j o f m f w b u f e b n c j f o u u f n q f s b u v s f b q q m j d b u j p o t t . b s l f e p o u p q t v s g b d f x j u i d p e f u p b m m p x b n q f s f s b u j o h j e f o u j ? d b u j p o x j u i p v u u f t u j o h t - p x q s p ? m f g p s i f j h i u t f o t j u j w f b q q m j d b u j p o t t ' m b u u p q t v s g b d f g p s q j d l b o e q m b d f p q f s b u j p o t t & m f n f o u d p w f s j o h n b u f s j b m j t s f t j t u b o u u p j o e v t u s z t u b o e b s e d m f b o j o h p q f s b u j p o t t . p v o u j o h q b e b o e f m f d u s j d b m q f s g p s n b o d f b s f j e f o u j d b m u p - j u u f m g v t f b o e 4 f s j f t q s p e v d u t t " m m p z c b t f e f m f n f o u d p o t u s v d u j p o q s p w j e f t t v q f s j p s j o s v t i x j u i t u b o e d i b s b d u f s j t u j d t * 2 u
p w f s d f s b n j d p s h m b t t c b t f e g v t f q s p e v d u t % of ampere rating opening time at 25 o c i p v s t
. j o j n v n t f d
. b y j n v n t f d
. b y j n v n applications ? 5 i f 94 4 f s j f t ' b t u " d u j o h 4 . ' j t b o v m u s b t n b m m t j [ f
u i j o ? m n e f w j d f e f t j h o f e g p s t f d p o e b s z q s p u f d u j p o p g d j s d v j u t v t f e j o 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 t v d i b t i b o e i f m e q p s u b c m f f m f d u s p o j d e f w j d f t 5 i j t t f s j f t j t m f b e g s f f b o e n f f u t u i f s f r v j s f n f o u t p g u i f 3 p ) 4 e j s f d u j w f / f x ) b m j e f ' s f f 4 f s j f t g v t f t b s f b w b j m b c m f u p p s e f s v t j o h u i f i ) ' w t v g ? y 4 f f 1 b s u / v n c f s j o h t f d u j p o g p s b e e j u j p o b m j o g p s n b u j p o 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 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 ampere rating (a) amp code max voltage rating (v) interrupting rating nominal cold resistance (ohms) nominal melting i 2 t (a 2 sec) nom voltage drop (mv) nom power dissipation (w) agency approvals ? " ! 7 " $ % $ y y y y y y y y y y " ! 7 " $ % $ y y y y y y y y y y y y y y y y y y electrical specifications by item 1. measured at 10% of rated current, 25oc. 2. measured at rated voltage. revised: july 6, 2009
introduction to circuit protection introduction to circuit protection transientology 2 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 494 series thin film > 0603 size > fast-acting > 494 series please refer to www.littelfuse.com/series/494.html for current information. average time current curves time in seconds current in amperes 0.01 0.1 0.1 1 1 10 100 10 100 0.001 3.50 a 3.00 a 2.50 a 2.00 a 1.75 a 1.50 a 1.25 a 1.00 a 0.750 a 0.500 a 0.375 a 0.250 a 4.00 a 5.00 a temperature rerating curve reflow condition 1 c o g s f f b t t f n c m z pre heat - temperature min (t s(min) ) ? $ - temperature max (t s(max) ) ? $ - time (min to max) (t s ) o t f d p o e t average ramp-up rate (liquidus temp (t l ) to peak) ? $ t f d p o e n b y t s(max) to t l - ramp-up rate ? $ t f d p o e n b y reflow - temperature (t l ) (liquidus) ? $ - temperature (t l ) o t f d p o e t peak temperature (t p ) ? $ time within 5c of actual peak temperature (t p ) o t f d p o e t ramp-down rate ? $ t f d p o e n b y time 25c to peak temperature (t p ) n j o v u f t n b y do not exceed ? $ soldering parameters time temperature t p t l t s(max) t s(min) 25 t p t l t s time to peak temperature (t 25oc to peak) ramp-down ramp-up preheat critical zone t l to t p
3 ? 2009 littelfuse, inc. specifications are subject to change without notice. surface mount fuses 494 series thin film > 0603 size > fast-acting > 494 series please refer to www.littelfuse.com/series/494.html for current information. 494 series materials body: " e w b o d f e ) j h i 5 f n q f s b u v s f 4 v c t u s b u f terminations: 5 j o p w f s / j d l f m p w f s $ p q q f s element cover coat: $ p o g p s n b m $ p b u j o h operating temperature o ? $ u p ? $ $ p o t v m u u f n q f s b u v s f s f s b u j o h d v s w f d i b s u ' p s p q f s b u j p o b c p w f ? $ d p o u b d u - j u u f m g v t f humidity . * - 4 5 % '
. f u i p e #
$ p o e j u j p o % thermal shock 8 j u i t u b o e t d z d m f t p g o ? $ u p ? $ vibration 1 f s . * - 4 5 % ' insulation resistance (after opening) ( s f b u f s u i b o
p i n t 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 ? $ b o e v q u p ? $
n b y j n v n product characteristics dimensions part marking system 1.09 (.043") reflow solder 1.60 (.063") .305 (.012") .279 (.011") .18 (.007") .127 (.005 ") marking code varies with amperage rating (see chart) r ref. 1.02 (.040") .762 (.030") 2.5 4 (.100") 1.09 (.043") wave solder 3.20 (.126") 1.09 (.043") 1.02 (.040") .813 (.032") sn sn cu sn coating amp code marking code d e f g h j k l n o p r s t part numbering system packaging packaging option packaging specification quantity quantity & packaging code n n 5 b q f b o e 3 f f m & * " 3 4 * & $
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/ 3 0494002.nrhf series amp code hf suffix halide free item packaging code 3 f g f s u p " n q $ p e f d p m v n o j o u i f & m f d u s j d b m 4 q f d j ? d b u j p o t u b c m f / 0 5 & 5 i f e p u j t q p j t j u j p o f e c f g p s f u i f 1 b d l b h j o h 4 v g ? y x j u i x i p m f s b u j o h t b o e x j u i j o u i f o v n c f s j o h t f r v f o d f g p s g s b d u j p o b m s b u j o h t / 3 5 b q f b o e 3 f f m
q d t
introduction to circuit protection introduction to circuit protection transientology 4 ? 2009 littelfuse, inc. specifications are subject to change without notice.
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