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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.


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Fremont, CA 94538-6540

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