The LSK489 is a monolithic N-Channel JFET designed and built by Linear Integrated Systems, Inc.LIS Inc, a Fremont, CA company.
The company also has an in-house fab which is an indication that it can maintain good process control over production lots by tweaking the process as needed in real time as well as monitoring production to increase it for high volume demand customer needs.
[citation needed]The LSK489 is an N-channel monolithic dual JFET with 1.8 nV per square root Hz noise at 1 kHz and low-capacitance (Ciss= 4pF).
These two parts are the only complementary dual JFETs pair currently in production.
[13] The part is also used in high-end sensor systems ranging from hydrophones to the front end of the Large Synoptic Survey Telescope (LSST) being developed by SLAC National Accelerator Laboratory.