LSK489 Press Release

Linear Systems
Mar 17, 2023
Low-Capacitance Dual N-Channel JFET
NEWS RELEASE
FOR INFORMATION CONTACT:
Linear Systems, Inc.
Sales Department
Phone: (510) 490-9160
Email: sales@linearsystems.com
Linear Systems Announces the Availability of the LSK489 Low-Noise, Low-Capacitance Dual N-Ch JFET Designed for All (Audio & Non-Audio) Low-Noise Applications
FREMONT, CALIFORNIA – December 10, 2012 – Linear Systems, a leading full-service manufacturer of specialty linear semiconductors, announces the immediate availability of its LSK489 1.8 nV/√Hz @ 1kHz, low-capacitance, N-Channel Monolithic Dual JFET. This is part of a family of ultra-low-noise dual JFETs specifically designed to provide users with better-performing, less-time-consuming, and cost-effective solutions for obtaining tighter IDSS matching and better thermal tracking than matching individual JFETs.
Available in surface-mount and RoHS-compliant versions, the LSK489 is an ideal improved functional replacement for similar JFETs with inferior noise characteristics and higher gate-to-drain capacitance, making it suitable for space-limited circuits in audio and instrumentation applications.
The LSK489 offers designers a significant increase in capabilities for a wide range of low-noise applications. Its lower capacitance, 4pF compared to 25pF in similar products, enables simpler circuit designs without the need for a cascode configuration, which can introduce higher circuit noise.
Like the LSK389, the LSK489 features a unique design construction of interleaving both JFETs on the same piece of silicon, providing excellent matching, thermal tracking, and nearly zero popcorn noise.
The LSK489 is available in surface-mount SOIC-8, thru-hole TO-71, and smaller SOT23-6 packages. Lead-free, RoHS-compliant versions are available. Linear Systems' domestic factory stock guarantees short lead times, ensuring no disruption in production schedules.
Summary of Features:
- Low Noise (typically 1.8 nV/√Hz @ 1kHz)
- Nearly Zero Popcorn Noise
- IDSS matching to 10% max
- Low Offset/Tight Matching (|Vgs1 - Vgs2| = 20mV max)
- Low Capacitance (CISS = 4pF)
- High Input Impedance
- High Breakdown Voltage (BVGSS = 40V Min)
- Low-noise, reduced device count alternative for the classic Dual JFET Cascode Configuration
- Improved replacement for Siliconix U401 series and the Linear Systems 844 series
- Available in surface-mount SOIC-8, smaller SOT23-6 packages
- Lead-Free/RoHS Compliant versions available
Applications:
- Microphone amplifiers
- Phono preamplifiers
- Audio amplifiers and preamps
- Discrete low-noise operational amplifiers
- Battery-operated audio preamps
- Audio mixer consoles
- Acoustic sensors
- Sonic imaging
- Instrumentation amplifiers
- Wideband differential amplifiers
- High-speed comparators
- Impedance converters
Pricing and Availability:
- Price: $5.38 each (1,000 pcs)
- Availability: Sampling now in SOIC-8, TO-71, and SOT23-6 package options
- Delivery: Factory Stock
About Linear Systems
Founded in 1987, Linear Systems is a full-service, privately-held designer and manufacturer of small-signal discrete semiconductors. The Fremont, CA-based company was founded by John H. Hall, co-founder of Intersil and founder of Micro Power Systems.
Linear Systems' product line includes Ultra-Low-Noise N-Channel and P-Channel Dual and Single JFETs, High-Speed Lateral DMOS Switches, Bipolar Transistors, BIFET Amplifiers, Current-Regulating Diodes, Low-Leakage Diodes, and MOSFETs. Datasheets, application notes, SPICE models, and additional information can be downloaded at www.linearsystems.com.
For more information, contact Linear Systems at sales@linearsystems.com or call (510) 490-9160.