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 ? ultra ? low ? noise ? e n ? = ? 0.9nv ? / ?? hz ? (typ) ? tight ? matching ? |v gs1 \ 2 |= ? 20mv ? max ? high ? breakdown ? voltage ? bv gss ? = ? 40v ? max ? high ? gain ? y fs ? = ? 20ms ? (typ) ? low ? capacitance ? 25pf ? (typ) ? improved ? second ? source ? replacement ? for ? 2sk389 ? absolute ? maximum ? ratings ? 1 ? @ ? 25c ? (unless ? otherwise ? noted) ? maximum ? temperatures ? storage ? temperature ?\ 65c ? to ? +150c ? operating ? junction ? temperature ?\ 55c ? to ? +135c ? maximum ? power ? dissipation ? continuous ? power ? dissipation ? @ ? + ? 125c ? 400mw ? maximum ? currents ? gate ? forward ? current ? i g ( f ) ? = ? 10ma ? maximum ? voltages ? gate ? to ? source ? v gss ? = ? 40v ? gate ? to ? drain ? v gds ? = ? 40v ? for ? equivalent ? single ? version, ? see ? lsk170a ? www.micross.com/pdf/lsm_lsk170a_sot \ 23.pdf ? ?? matching ? characteristics ? @ ? 25c ? (unless ? otherwise ? stated) ? symbol ? characteristic ? min ? typ ? max ? units ? conditions ? |v gs1 ? ? ? v gs2 ? | ? differential ? gate ? to ? source ? cutoff ? voltage ? \\? \\ ? 20 ? mv ? v ds ? = ? 10v, ?? i d ? = ? 1ma ? i dss1 ?? / ? i dss2 ? gate ? to ? source ? saturation ? current ? ratio ? 0.9 ? \\? \\? \\? v ds ? = ? 10v, ??? v gs ? = ? 0v ? ? electrical ? characteristics ? @ ? 25c ? (unless ? otherwise ? noted) symbol ? characteristics ? min. ? typ. ? max. ? units ? conditions ? bv gss ? gate ? to ? source ? breakdown ? voltage ? 40 ? \\? \\? v ? v ds ? = ? 0, ?? i d ? = ? 100a ? v gs ( off ) ? gate ? to ? source ? pinch \ off ? voltage ? 0.15 ? \\? 2 ? v ? v ds ? = ? 10v, ?? i d ? = ? 0.1a ? ? i dss ? drain ? to ? source ? saturation ? current ? 2sk389a ? / ? LSK389a ? 2.6 ? \\? 6.5 ?? ma ? ? ? v ds ? = ? 10v, ??? v gs ? = ? 0v ? 2sk389b ? / ? LSK389b ? 6 ? \\? 12 ? 2sk389c ? / ? LSK389c ? 10 ? \\? 20 ? i gss ? gate ? to ? source ? leakage ? current ? \\? \\? 200 ? pa ? v gs ? = ?\ 30v, ??? v ds ? = ? 0v ? y fs ? full ? conduction ? transconductance ? 8 ? 20 ? \\? ms ? v ds ? = ? 10v, ??? v gs ? = ? 0v, ??? i dss ? = ? 3ma, ?? f ? = ? 1khz ??? e n ? noise ? voltage ? \\? 0.9 ? 1.9 ? nv/ hz ? v ds ? = ? 10v, ?? i d ? = ? 2ma, ?? f ? = ? 1khz, ?? nbw ? = ? 1hz ???? e n ? noise ? voltage ? \\? 2.5 ? 4 ? nv/ hz ? v ds ? = ? 10v, ?? i d ? = ? 2ma, ?? f ? = ? 10hz, ?? nbw ? = ? 1hz ???? c iss ? common ? source ? input ? capacitance ? \\? 25 ? \\? pf ? v ds ? = ? 10v, ??? v gs ? = ? 0v, ???? f ? = ? 1mhz ???? c rss ? common ? source ? reverse ? transfer ? capacitance ? \\? 5.5 ? \\? pf ? v dg ? = ? 10v, ??? i d ? = ? 0v, ???? f ? = ? 1mhz ???? notes: ? 1. ? absolute ? maximum ? ratings ? are ? limiting ? values ? above ? which ? serviceability ? may ? be ? impaired ? ? ? ? ? LSK389 ultra low noise dual n-channel j-fet replace discontinued toshiba 2sk389 with LSK389 the 2sk389 / LSK389 is a 1nv/ hz single chip dual jfet available packages: LSK389 in soic-a LSK389 available as bare die please contact micross for fu ll package and die dimensions: email: chipcomponents@micross.com web: www.micross.com/distribution.aspx 2sk389 / LSK389 applications: ? audio ? amps, effects boxes, microphones ? instrumentation? input stages ? acoustic sensors ? sonobouys ? military ? antisubmarine, personnel vehicle detectors, sonar, radiation detectors why use monolithic dual jfet instead of 2 single jfets? 2sk389 / LSK389 removes si gnificant cost for test screening time needed to match i dss on 2 individual jfets and offers zero yield loss. 2sk389 / LSK389 on-chip i dss matching gives closest possible synchronous electrical performance and also offers better matched performance when the chip is subjected to temperature. the 8 pin soic-a provides ease of manufacturing, and the symmetrical pinout prev ents improper orientation. ( see packa g in g information ) . soic-a (top view)
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