Linear Integrated Systems (LIS), a leading full-service manufacturer of specialty linear semiconductors, announces
series of 1nV
Dual JFETs. The LSK389 series is a monolithic dual version of the recently released
LSK170 Single N-Channel JFET. This family of ultra low noise dual JFETs was
specifically designed to provide users a
better performing, less time consuming,
and cheaper solution for obtaining tighter
IDSS matching, and better thermal tracking, than matching individual JFETs. Available packaged in surface mount, ROHS
compliant versions, the LSK389 is an
ideal improved functional replacement
for the through-hole Toshiba 2SK389,
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The LSK389’s features incorporate
three grades of IDSS: 2. 6-6. 5 mA, 6.0-12
mA, 10-20 mA, with an IDSS match of
10%, a gate threshold offset of 20 mV, a
voltage noise (en) of 1 nv/Hz @ 1 kHz, 2
nv/Hz @ 10 Hz typical, with a gain of 22
ms, and 22 pf of capacitance.
The LSK389 series helps to maximize battery operated applications by
providing a wide output swing and a
high signal-to-noise ratio as a result of
the LSK389’s tightly matched gate
threshold voltages and low gate threshold voltages. The uniquely linear VGS
transfer function is highly desirable for
producing low intermodulation in audio
front-ends. The 40 volt breakdown provides maximum linear headroom in high
transient program content amplifiers.
The LSK389 provides a low input noise
to capacitance product that has nearly
zero popcorn noise. The narrow ranges
of the IDSS electrical grades combined
with the matching performance of the
LSK389’s monolithic dual construction
promote ease of device tolerancing in
low voltage applications, as compared
to matching single JFETs. Additionally,
LIS offers custom screening for users
who require different ranges of IDSS,
VGS, or other DC parameters that are
not covered in the datasheet.
The LSK389 series is packaged in
surface mount SOIC- 8 and thru-hole
TO- 71 six lead packages and lead-free,
ROHS compliant versions are available.
“Our new LSK389 series features
a unique design construction of
interleaving both JFETs on the same
piece of silicon that provides
excellent matching and thermal tracking, as well a low noise profile having
nearly zero popcorn noise,” says Dr.
John Hall, Linear Integrated Systems
founder and president.
Linear Integrated Systems
domestic in-factory stock provides
short lead times, helping to ensure no
disruption in production schedules.
Applications include audio amplifiers and preamps, discrete low-noise
operational amplifiers, battery-operated audio preamps, audio mixer
consoles, acoustic sensors, sonic
imaging, instrumentation amplifiers,
microphones, sonobouys, hydro-