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 ? high ? input ? impedance ? i g ? = ? 0.25pa ? max ? high ? gain ? gfs ? = ? 120mho ? min ? low ? power ? operation ? v gs ( off ) ? = ? 2v ? max ? absolute ? maximum ? ratings ?? @ ? 25c ? (unless ? otherwise ? noted) ? maximum ? temperatures ? storage ? temperature ?\ 65c ? to ? +150c ? operating ? junction ? temperature ? +150c ? maximum ? voltage ? and ? current ? for ? each ? transistor ? ? ? note ? 1 ? \ v gss ? gate ? voltage ? to ? drain ? or ? source ? 40v ? \ v dso ? drain ? to ? source ? voltage ? 40v ? \ i g ( f ) ? gate ? forward ? current ? 10ma ? maximum ? power ? dissipation ? device ? dissipation ? @ ? free ? air ? ? ? total ????????????????? 400mw ? @ ? +125c ? matching ? characteristics ? @ ? 25c ? unless ? otherwise ? noted symbol ? characteristics ? value ? units ? conditions ? | ? v ? gs1 \ 2 ? / ? t|max. ? drift ? vs. ? temperature ? 10 ? v/c ? v dg =10v, ? i d =30a ? t a = \ 55c ? to ? +125c ? | ? v ? gs1 \ 2 ? | ? max. ? offset ? voltage ? 10 ? mv ? v dg =10v, ? i d =30a ? electrical ? characteristics ? @ ? 25c ? (unless ? otherwise ? noted) symbol ? characteristics ? min. ? typ. ? max. ? units ? conditions ? bv gss ? breakdown ? voltage ? 40 ? 60 ? \\? v ? v ds ? = ? 0 ?????????????????? i g =1na ? bv ggo ? gate \ to \ gate ? breakdown ? 40 ? \\? \\? v ? ?????? i g ? = ? 1a ??????????????? i d = ? 0 ??????????????? i s = ? 0 ? ? y fss ? transconductance ? full ? conduction ? ? 300 ? ? \\? ? 1500 ? ? mho ? ? v ds ? = ? 10v ????????? v gs = ? 0v ?????? f ? = ? 1khz ? y fs ? typical ? operation ? 120 ? 200 ? 350 ? mho ? ????? v dg ? = ? 10v ?????????? i d = ? 30a ???? f ? = ? 1khz ? ? i dss ? drain ? current ? full ? conduction ? ? 60 ? ? \\? ? 1000 ? ? a ? ? v ds ? = ? 10v ?????????????? v gs = ? 0v ? ? v gs ( off ) ? gate ? voltage ? pinchoff ? voltage ? ? \\? ? \\? ? 2.0 ? ? v ? ? v ds ? = ? 10v ??????????????? i d = ? 1na ? v gs ? operating ? range ? \\? \\? 1.8 ? v ? ???????????? v dg ? = ? 10v ????????????????? i d = ? 30a ? ? i g max. ? gate ? current ? operating ? ? \\? ? \\? ? .25 ? ? pa ? ? ?? v dg ? = ? 10v ??????????????? i d = ? 30a ? \ i g max. ? high ? temperature ? \\? \\? 250 ? pa ? t a ? = ? +125c ? i gss max. ? at ? full ? conduction ? \\? \\? 1.0 ? pa ? v ds ? = ? 0v ????????????? v gs = ? 20v ? \ i gss max. ? high ? temperature ? \\? \\? 1.0 ? na ? t a ? = ? +125c ?? ? y oss ? output ? conductance ? full ? conduction ? ? \\? ? \\? ? 10 ? ? mho ? ? v ds ? = ? 10v ?????????????? v gs = ? 0v ? y os ? operating ? \\? 0.1 ? 3.0 ? mho ?? v dg ? = ?? 10v ????????????? i d = ? 30a ? ? cmr ? common ? mode ? rejection ? \ 20 ? log ? | ?? v ? gs1 \ 2 / ?? v ds | ? ? \\? ? 90 ? ? \\? ? db ? ? ? v ds ? = ? 10 ? to ? 20v ???????? i d = ? 30a ? ?\ 20 ? log ? | ?? v ? gs1 \ 2 / ?? v ds | ? \\? 90 ? \\? db ?? v ds ? = ? 5 ? to ? 10v ?????????? i d = ? 30a ? ? nf ? noise ? figure ? ? \\? ? \\? ? 1 ? ? db ? v dg ? = ? 10v ????? i d ? = ? 30a ????? r g ? = ? 10m ? f ? = ? 10hz ???????????? e n ? voltage ? \\? 20 ? 70 ? nv/ hz ? ???? v dg ? = ? 10v ????? i d ? = ? 30a ?????? f ? = ? 10hz ??? ? ? \\? 10 ? \\? ? ???? v dg ?? = ? 10v ???? i d ? = ? 30a ?????? f ? = ? 1khz ??? ? c iss ? capacitance ? input ? ? \\? ? \\? ? 3.0 ? ? pf ? ? v ds = ? 10v ??????? v gs = ? 0 ????? f ? = ? 1mhz ? c rss ? reverse ? transfer ? \\? \\? 1.5 ? pf ?? the u424 is a high input impedance monolithic dual n-channel jfet u424 high input impedance monolithic dual n-channel jfet available packages: u424 in to-71 & to-78 u424 in pdip & soic u424 available as bare die please contact micross for full package and die dimensions email: chipcomponents@micross.com u424 applications: ? ultra low input current differential amps ? high-speed comparators ? impedance converters the u424 monolithic dual n-channel jfet is designed to provide very high input impedance for differential amplification and impedance matching. among its many unique features, this series offers operating gate current specified at -500 fa. the u424 is a direct replacement for discontinued siliconix u424. the hermetically sealed to-71 & to-78 packages are well suited for military applications. the 8 pin p-dip and 8 pin soic provide ease of manufacturing, and the symmetrical pinout prevents improper orientation. (see packaging information). linear s y stems re p laces discontinued siliconix u424 to-71 / to-78 (top view) p-dip / soic (top view) note 1 ? these ratings are limiting values above which the serviceability of any semiconductor may be impaired
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