click to buy information furnished by linear integrated systems and micross components is believed to be accurate and reliable. however, no responsibility is assumed for its use; nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of linear integrated systems. features ? low ? drift ? | ?? v gs1 \ 2 ? / ? t|= ? 5v/c ? max. low ? leakage ? i g ? = ? 20pa ? typ. ? low ? noise ? e n ? = ? 10nv/ hz ? typ. ? absolute ? maximum ? ratings ?? @ ? 25c ? (unless ? otherwise ? noted) ? maximum ? temperatures ? storage ? temperature ?\ 65c ? to ? +200c ? operating ? junction ? temperature ? +150c ? maximum ? voltage ? and ? current ? for ? each ? transistor ? ? ? note ? 1 ? \ v gss ? gate ? voltage ? to ? drain ? or ? source ? 60v ? \ v dso ? drain ? to ? source ? voltage ? 60v ? \ i g ( f ) ? gate ? forward ? current ? 50ma ? maximum ? power ? dissipation ? device ? dissipation ? @ ? free ? air ? ? ? total ????????????????? 400mw ? @ ? 25c ? ? matching ? characteristics ? @ ? 25c ? unless ? otherwise ? noted symbol ? characteristics ? value ? units ? conditions ? | ? v ? gs1 \ 2 ? / ? t| ? max. ? drift ? vs. ? temperature ? 25 ? v/c ? v dg =20v, ? i d =200a ? t a = \ 55c ? to ? +125c ? | ? v ? gs1 \ 2 ? | ? max. ? offset ? voltage ? 10 ? mv ? v dg =20v, ? i d =200a ? electrical ? characteristics ? @ ? 25c ? (unless ? otherwise ? noted) symbol ? characteristics ? min. ? typ. ? max. ? units ? conditions ? bv gss ? breakdown ? voltage ? 60 ? \\? \\? v ? v ds ? = ? 0 ?????????????????? i d =1a ? bv ggo ? gate \ to \ gate ? breakdown ? 60 ? \\? \\? v ? ?????? i ? g = ? 1na ??????????????? i d = ? 0 ??????????????? i s = ? 0 ? ? y fss ? transconductance ? full ? conduction ? ? 1000 ? ? 2000 ? ? 3000 ? ? mho ? ? v dg = ? 20v ????????? v gs = ? 0v ?????? f ? = ? 1khz ? y fs ? typical ? operation ? 500 ? 700 ? 1000 ? mho ? ????? v dg = ? 20v ????????? i d = ? 200a ????? |y fs1 \ 2 ? / ? y ? fs | ? mismatch ? \\? 0.6 ? 3 ? % ?? ? i dss ? drain ? current ? full ? conduction ? ? 0.5 ? ? 2 ? ? 5 ? ? ma ? ? v dg = ? 20v ?????????????? v gs = ? 0v ? |i dss1 \ 2 ? / ? i dss | ? mismatch ? at ? full ? conduction ? \\? 1 ? 5 ? % ?? ? v gs (off) ? or ? v p ? gate ? voltage ? pinchoff ? voltage ? ? 1 ? ? 2 ? ? 4.5 ? ? v ? ? v ds = ? 20v ??????????????? i d = ? 1na ? v gs (on) ? operating ? range ? 0.5 ? \\? 4 ? v ? ?????????????? v ds =20v ????????????????? i d =200a ? ? \ i g ? gate ? current ? operating ? ? \\? ? 20 ? ? 50 ? ? pa ? ? v dg = ? 20v ?????????? i d = ? 200a ? \ i g ? high ? temperature ? \\? \\? 50 ? na ? t a = ? +125c ? \ i g ? reduced ?? v dg ? \\? 5 ? \\? pa ? v dg = ? 10v ????????? i d = ? 200a ? \ i gss ? at ? full ? conduction ? \\? \\? 100 ? pa ? v dg = ? 20v ?????????????? v ds = ? 0 ? ? y oss ? output ? conductance ? full ? conduction ? ? \\? ? \\? ? 5 ? ? mho ? ? v dg = ? 20v ?????????????? v gs = ? 0v ? y os ? operating ? \\? 0.1 ? 1 ? mho ? v dg = ?? 20v ??????????? i d = ? 200a ? |y os1 \ 2 | ? differential ? \\? 0.01 ? 0.1 ? mho ? ? cmr ? common ? mode ? rejection ? \ 20 ? log ? | ? v gs1 \ 2 / ? v ds | ? ? \\? ? 100 ? ? \\? ? db ? ? ? v ds ? = ? 10 ? to ? 20v ???????? i d =200a ? cmr ?\ 20 ? log ? | ? v gs1 \ 2 / ? v ds | ? \\? 75 ? \\? db ?? v ds ? = ? 5 ? to ? 10v ???????? i d =200a ? ? nf ? noise ? figure ? ? \\? ? \\? ? 0.5 ? ? db ? v ds = ? 20v ?????? v gs = ? 0v ??????? r g = ? 10m ? f= ? 100hz ??????????? nbw= ? 6hz ? e n ? voltage ? \\? \\? 15 ? nv/ hz ? v ds =20v ??? i d =200a ??? f=10hz ?? nbw=1hz ? ? c iss ? capacitance ? input ? ? \\? ? \\? ? 6 ? ? pf ? ? v ds = ? 20v ??????? v gs = ? 0v ??????? f= ? 1mhz ? c rss ? reverse ? transfer ? \\? \\? 2 ? pf ? c dd ? drain \ to \ drain ? \\? 0.1 ? \\? pf ? v dg = ?? 20v ??????????? i d = ? 200a ? the LS3955 is a low noise, low dri ft, monolithic dual n-channel jfet LS3955 monolithic dual n-channel jfet note 1 ? these ratings are limiting values above which the serviceability of any semiconductor may be impaired LS3955 applications: ? wideband differential amps ? high input impedance amplifiers the LS3955 family are matched jfet pairs for differential amplifiers. the LS3955 family of general purpose jfets is characterized for low and medium frequency differential amplifiers requiring low offset voltage, drift, noi se and capacitance the LS3955 family exhibits low capacitance - 6pf max and a spot noise figure of - 0.5db max. the part offers a superior tracking ability. the 8 pin p-dip and 8 pin soic provide ease of manufacturing, and the symm etrical pinout prevents improper orientation. (see packaging information). pdip / soic (top view) available packages: LS3955 in pdip / soic LS3955 available as bare die please contact micross for full package and die dimensions micross components europe tel: +44 1603 788967 email: chipcomponents@micross.com web: http://www.micross.com/distribution
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