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SINGLE, LOW NOISE, LOW CAPACITANCE, HIGH INPUT IMPEDANCE, N-CHANNEL JFET AMPLIFIER < Back LSK170 Series SINGLE, LOW NOISE, LOW CAPACITANCE, HIGH INPUT IMPEDANCE, N-CHANNEL JFET AMPLIFIER The LSK170 Single, Low Noise, Low Capacitance, High Input Impedance, N-Channel JFET Amplifier is a direct replacement for Toshiba 2SK170. It is ideal for Ultra Low Noise Audio/Acoustic Applications. Available in the TO-92 3L RoHS, SOT-23 3L RoHS and SOT-89 3L RoHS package, as well as in die form. Advanced screening options are available for our diverse product lineup, featuring JFETS, Bipolar transistors, MOSFETs, current regulators, and Diodes. Our special screening covers all the parameters listed in the standard datasheet, including comprehensive package pin-out. Connect with our experienced technical team to discuss your specific needs and tailor your requirements—email us at support@linearsystems.com or call (510) 490-9160. MOQ applies to these specialized services. Ordering Information Below are the options you have when ordering this part series: LSK170A TO-92 3L RoHS LSK170B TO-92 3L RoHS LSK170C TO-92 3L RoHS LSK170D TO-92 3L RoHS LSK170A SOT-23 3L RoHS LSK170B SOT-23 3L RoHS LSK170C SOT-23 3L RoHS LSK170D SOT-23 3L RoHS LSK170A SOT-89 3L RoHS LSK170B SOT-89 3L RoHS LSK170C SOT-89 3L RoHS LSK170D SOT-89 3L RoHS LSK170A Die LSK170B Die LSK170C Die LSK170D Die Datasheet Spice Model Application Notes

MONOLITHIC DUAL, NPN TRANSISTOR < Back IT124 MONOLITHIC DUAL, NPN TRANSISTOR The IT124 Monolithic Dual, NPN Transistor, Super Beta is a direct replacement for th Intersil IT124. It is ideal for Small Signal Transistor, Super Beta, Amplifier & Switching Applications. It is available the in TO-71 6L RoHS, TO-78 6L RoHS, PDIP 8L ROHS and SOIC 8L RoHS package, as well as bare die. Advanced screening options are available for our diverse product lineup, featuring JFETS, Bipolar transistors, MOSFETs, current regulators, and Diodes. Our special screening covers all the parameters listed in the standard datasheet, including comprehensive package pin-out. Connect with our experienced technical team to discuss your specific needs and tailor your requirements—email us at support@linearsystems.com or call (510) 490-9160. MOQ applies to these specialized services. Ordering Information Below are the options you have when ordering this part series: IT124 TO-71 6L RoHS IT124 TO-78 6L RoHS IT124 PDIP 8L RoHS IT124 SOIC 8L RoHS IT124 Die Datasheet Spice Model Application Notes

< Back Ansberry Named VP Linear Systems Mar 17, 2023 Michael Ansberry - VP for Process Engineering. Ansberry Named VP NEWS RELEASE FOR INFORMATION CONTACT: Laura Madonna, Marketing Analyst Linear Integrated Systems, Inc. Phone: (510) 490-9160 Email: laura@linearsystems.com ANSBERRY NAMED VP FOR PROCESS ENGINEERING AT LINEAR INTEGRATED SYSTEMS FREMONT, CA – 06/27/2018. Linear Integrated Systems, Inc., is proud to announce and welcome Michael Ansberry as the company’s Vice President for Process Engineering. Ansberry will be responsible for all aspects of the company’s semiconductor fabrication operations. Ansberry joins Linear Integrated Systems (Linear Systems) from Lumileds, where he was Director of Operations. Lumileds is a lighting company that designs and manufactures LEDs for automotive, general and specialty lighting applications. Prior to Lumileds, he worked in process engineering at Sipex, Micro Power Systems and other Silicon Valley semiconductor companies. While Ansberry’s most recent experience is in managing large-scale LED production, he has extensive process engineering experience with the types of world-class semiconductors produced by Linear Systems. “Linear Systems makes the best parts in their class, and I’m very glad to be joining the team here,” Ansberry said. “Ultra-low-noise discrete components are critical for a wide range of applications and joining Linear Systems during this period of growth is exciting.” Linear Systems CEO Cindy L. Johnson said Ansberry's hiring is a key part of the company’s program to expand to meet a growing demand for its products. “Efforts to produce more precise and capable sensors are leading designers to incorporate our ultra-low-noise JFETs and other parts into their devices,” Linear Integrated Systems, Inc., is a full-service, privately-held, 30-year-old designer and manufacturer of small-signal discrete semiconductors. The Fremont, CA company was founded by John H. Hall, co-founder of Intersil and founder of Micro Power Systems. Linear Systems’ product line consists of: 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, MOSFETs, PhotoFETS, and Voltage Controlled Resistors. Data sheets can be downloaded at linearsystems.com .

MONOLITHIC DUAL, PNP TRANSISTOR < Back IT130 Series MONOLITHIC DUAL, PNP TRANSISTOR Previous Next

SINGLE, LOW LEAKAGE PICO-AMP DIODES < Back J/SST/PAD Series SINGLE, LOW LEAKAGE PICO-AMP DIODES The PAD Series Ultra-Low Leakage, Protection Diode is a direct replacement for the Siliconix-Vishay part series. It is ideal for Pico Amp, Ultra-Low Leakage, Protection Diode Applications. This part series is available in the TO-72 3L RoHS, TO-92 2L RoHS and SOT-23 3L RoHS package, as well as die form. Advanced screening options are available for our diverse product lineup, featuring JFETS, Bipolar transistors, MOSFETs, current regulators, and Diodes. Our special screening covers all the parameters listed in the standard datasheet, including comprehensive package pin-out. Connect with our experienced technical team to discuss your specific needs and tailor your requirements—email us at support@linearsystems.com or call (510) 490-9160. MOQ applies to these specialized services. Ordering Information Below are the options you have when ordering this part series: PAD1 TO-72 3L RoHS PAD2 TO-72 3L RoHS PAD5 TO-72 3L RoHS PAD10 TO-72 3L RoHS PAD20 TO-72 3L RoHS PAD50 TO-72 3L RoHS PAD100 TO-72 3L RoHS JPAD5 TO-92 2L RoHS JPAD10 TO-92 2L RoHS JPAD20 TO-92 2L RoHS JPAD50 TO-92 2L RoHS JPAD100 TO-92 2L RoHS SSTPAD1 SOT-23 3L RoHS SSTPAD2 SOT-23 3L RoHS SSTPAD5 SOT-23 3L RoHS SSTPAD10 SOT-23 3L RoHS SSTPAD20 SOT-23 3L RoHS SSTPAD50 SOT-23 3L RoHS SSTPAD100 SOT-23 3L RoHS PAD1 Die PAD2 Die PAD5 Die PAD10 Die PAD20 Die PAD50 Die PAD100 Die Datasheet Spice Model Application Notes

< Back DFN Sample Kit Overview Now it’s easier than ever to test-drive Linear Systems’ most popular parts in one of the industry’s smallest leadless packages. This kit includes a sampling of discretes in the near chip scale footprint, DFN 8L package. The DFN package is a plastic encapsulated package with a copper lead frame substrate. It offers a thin profile, low weight and good thermal and electrical performance. Electrical contact to the PCB is made by soldering perimeter leads to PCB. There is no die attach pad exposed on the bottom surface of the package, which provides more flexible PCB level circuitry routing and in some cases, more thermal resistance for the heat conduction from PCB to component. In this kit you will receive 3 pieces of each of the following parts: 174 DFN 8L RoHS: P-Channel, Single, JFET Switch 4392 DFN 8L RoHS: Low Noise, N-Channel JFET Switch PAD5 DFN 8L RoHS: Low Leakage, Single, Pico-Amp Diode 589 DFN 8L RoHS: Monolithic Dual, N-Channel JFET 489 DFN 8L RoHS: Low Noise, Low Capacitance, Monolithic Dual, N-Channel JFET 689 DFN 8L RoHS: Low Noise, Low Capacitance, Monolithic Dual, P-Channel JFET 352 DFN 8L RoHS: Tightly Matched, Monolithic Dual, PNP Transistor 312 DFN 8L RoHS: Tightly Matched, Monolithic Dual, NPN Transistor Ordering Information When ordering this kit please use the following part call out: DFN SAMPLE BOX

Linear Systems designs and manufactures the highest-performance line of monolithic dual JFETs in the industry. Contact us for a quote! Back 2N5564 Series LOW NOISE, MONOLITHIC DUAL, N-CHANNEL JFET The 2N5564 Series is a Low Noise, Monolithic Dual, N-Channel JFET. These matched pairs of JFETs are mounted in a TO-71 package. The two-chip design reduces parasitics for good performance at high frequency while ensuring extremely tight matching. This series features high breakdown voltage, high gain, and <5 mV offset between the two die. It is a Pin-for-Pin Replacement for Siliconix-Vishay 2N5564 Series, available in the TO-71 6L RoHS package, as well as bare die. Advanced screening options are available for our diverse product lineup, featuring JFETS, Bipolar transistors, MOSFETs, current regulators, and Diodes. Our special screening covers all the parameters listed in the standard datasheet, including comprehensive package pin-out. Connect with our experienced technical team to discuss your specific needs and tailor your requirements—email us at support@linearsystems.com or call (510) 490-9160. MOQ applies to these specialized services. Ordering Information Below are the options you have when ordering this part series: 2N5564 TO-71 6L RoHS 2N5565 TO-71 6L RoHS 2N5566 TO-71 6L RoHS 2N5564 Die 2N5565 Die 2N5566 Die Datasheet Spice Model Application Notes

LS3250 Single NPN High-Speed Switching Transistor < Back LS3250S - Single LS3250 Single NPN High-Speed Switching Transistor Previous Next

SINGLE, HIGH FREQUENCY, N-CHANNEL JFET AMPLIFIER < Back J/SST/U308 Series SINGLE, HIGH FREQUENCY, N-CHANNEL JFET AMPLIFIER The J/SST/U308 Series Single, High Frequency, N-Channel JFET Amplifier is a direct replacement for the Fairchild, NXP and Siliconix-Vishay equivalent part. It is ideal for High Frequency Applications. The series is available in the TO-92 3L RoHS, TO-18 3L RoHS and SOT-23 3L RoHS package, as well as in die form. Advanced screening options are available for our diverse product lineup, featuring JFETS, Bipolar transistors, MOSFETs, current regulators, and Diodes. Our special screening covers all the parameters listed in the standard datasheet, including comprehensive package pin-out. Connect with our experienced technical team to discuss your specific needs and tailor your requirements—email us at support@linearsystems.com or call (510) 490-9160. MOQ applies to these specialized services. Ordering Information: Below are the options you have when ordering this part series: J308 TO-92 3L RoHS J309 TO-92 3L RoHS J310 TO-92 3L RoHS U308 TO-18 3L RoHS U309 TO-18 3L RoHS U310 TO-18 3L RoHS SST308 SOT-23 3L RoHS SST309 SOT-23 3L RoHS SST310 SOT-23 3L RoHS U308 Die U309 Die U310 Die Datasheet Spice Model Application Notes

< Back LSK489 App Note Introduction For circuits designed to work with high impedance sources, ranging from electrometers to microphone preamplifiers, the use of a low-noise, high-impedance device between the input and the op amp is needed in order to optimize performance. At first glance, one of Linear Systems’ most popular parts, the LSK389 ultra-low-noise dual JFET would appear to be a good choice for such an application. The part’s high input impedance (1 TΩ) and low noise (1 nV/√Hz at 1kHz and 2mA drain current) enables power transfer while adding almost no noise to the signal. But further examination of the LSK389’s specification shows an input capacitance of over 20pF. This will cause intermodulation distortion as the circuit’s input signal increases in frequency if the source impedance is high. This is because the JFET junction capacitances are nonlinear. This will be especially the case where common source amplifier arrangements allow the Miller effect to multiply the effective value of the gate-drain capacitance. Further, the LSK389’s input impedance will fall to a lower value as the frequency increases relative to a part with lower input capacitance. A better design choice is Linear Systems’ new offering, the LSK489. Though the LSK489 has slightly higher noise (1.5 nV/√Hz vs. 1.0 nV/√Hz) its much lower input capacitance of only 4pF means that it will maintain its high input impedance as the frequency of the input signal rises. More importantly, using the lower-capacitance LSK489 will create a circuit that is much less susceptible to intermodulation distortion than one using the LSK389. The LSK489’s lower gate-to-drain capacitance enables more effective, elegant audio circuit designs. The relatively high capacitance of the LSK389 often requires designers to use a cascode circuit to provide the ability to handle higher bandwidths without intermodulation distortion. The cascode does this by eliminating the Miller effect that can multiply the effective gate-drain capacitance and its associated nonlinear effects. However, the cascode adds complexity and noise contributed by the cascode transistors. The LSK489 is an N-channel dual low-noise, low-capacitance, tightly matched monolithic field effect transistor. It features: • 3ms transconductance at 2mA drain current • 1000 GΩ input impedance • 60V breakdown voltage • gate-drain capacitance of only 1.5pF • 4pF input capacitance • 1.5 nV/√Hz noise at 1kHz • best low-noise/low-capacitance combination in the industry • lowest input capacitance per unit gate length in the industry • lowest noise for a given gate length in the industry • tight Vgs matching at operating bias Read More

Insights and Updates March 31, 2025 at 6:45:00 PM Jagdev Bariana: Chief Product Officer Linear Systems Promotes Jagdev Bariana to Chief Product Officer Read More January 13, 2025 at 8:00:00 PM Mike Ansberry: VP of Manufacturing and General Manager Mike Ansberry Named VP of Manufacturing and General Manager at Linear Systems Read More December 25, 2024 at 8:00:00 PM Linear Integrated Systems Expands Custom Testing Services to Provide Designers Greater Optimization and Flexibility Linear Integrated Systems (Linear Systems) is pleased to announce the immediate availability of Expanded Custom Testing Services for all its Small Signal Discrete Products. These services allow designers to tailor product specifications to meet specific design requirements, empowering them to optimize performance and enhance flexibility. Read More November 21, 2024 at 8:00:00 PM Jaime Cook: VP of Operations & Market Development Jaime Cook Appointed VP of Operations & Market Development at Linear Systems, Inc. Read More October 7, 2024 at 7:00:00 PM What are Current Regulating Diodes Current regulating diodes, also known as constant current diodes or current limiting diodes, are electronic components that control the amount of electrical current flowing through a circuit. They work by maintaining a constant voltage across themselves despite changes in the load resistance. Read More October 7, 2024 at 7:00:00 PM Specialty Semiconductor - Linear Systems Linear Systems has designed, manufactured and distributed the best specialty semiconductors in their respective classes since 1987. Working in three Silicon Valley fabrication facilities, our components are world leaders in applications ranging from military underwater listening to the largest space telescope camera in existence. Read More September 26, 2024 at 7:00:00 PM BIFET Amplifiers BIFET amplifiers are a type of operational amplifier (op-amp) that use bipolar junction field-effect transistors (BJFETs) as their input stage. Read More July 25, 2024 at 2:45:00 PM Designing Audio Circuits and Systems Exploring Phono Preamp Circuits with Bob Cordell’s New Book Read More July 16, 2024 at 6:45:00 PM Bipolar Transistors Linear Systems’ Monolithic Dual NPN and PNP transistors consist of two transistors on the same piece of silicon resulting in better matching and better performance over temperature. These parts are designed for general purpose amplifier and switching applications. Read More July 9, 2024 at 7:45:00 PM MOSFETs Linear Systems’ small signal MOSFETs consist of two MOSFETs on the same piece of silicon resulting in better matching and better performance over temperature. Read More June 17, 2024 at 7:20:00 PM DMOS High Speed Switches by Linear Systems The Linear Systems family of DMOS devices is designed to handle a wide range of video, fast ATE, telecom and other analog switching applications. These components are capable of ultrafast switching speeds (tr = 1 ns, tOFF = 3 ns) and excellent transient response. Thanks to reduced parasitic capacitances, our DMOS can handle wideband signals with high off-isolation and minimum crosstalk. Read More June 10, 2024 at 7:15:00 PM FAST SAMPLE AND HOLD In this interesting design, a strobe pulse sets the sample mode. Here's how it works: Read More June 3, 2024 at 6:45:00 PM Linear Systems Capabilities Statement Who we are and what we do Read More May 30, 2024 at 7:00:00 PM What is a JFET? JFETs are three-terminal semiconductor devices that can be used as electronically controlled switches or resistors, or to build amplifiers. Read More March 17, 2023 at 3:00:00 PM Military Sensors White Paper Linear Systems' White Paper Describes Lowest Noise Amplification for Sensor Signal Chains Read More March 17, 2023 at 3:00:00 PM LSK170 Press Release Direct Replacement for Toshiba 2SK170 Read More March 17, 2023 at 3:00:00 PM John H. Hall In Remembrance of Linear Systems' Founder Read More March 17, 2023 at 3:00:00 PM Cloud Microphones Keeping the Family Business Going Read More March 17, 2023 at 3:00:00 PM LTspice Press Release Linear Systems' JFETs in LTspice Read More March 17, 2023 at 3:00:00 PM SD5400/SD5000 Introducing Family of Quad N-channels Read More March 17, 2023 at 3:00:00 PM Testing Capability New Low-Noise Semiconductor Testing Capability Read More March 17, 2023 at 3:00:00 PM LSK389 Press Release Ultra-Low Noise, Monolithic Dual, N-Channel JFET Read More March 17, 2023 at 3:00:00 PM Largest Digital Camera Engineering the World’s Largest Digital Camera Read More March 17, 2023 at 3:00:00 PM LSJ689 Press Release Ultra Low Noise P-Channel Dual JFET Read More March 17, 2023 at 3:00:00 PM LS26VPS/VNS Press Release New JFET Voltage-Controlled Resistors Read More March 17, 2023 at 3:00:00 PM High Temp Products High Temp Discrete Products Read More March 17, 2023 at 3:00:00 PM DMOS Product Line DMOS Product Line Acquired from Vishay/Siliconix Read More March 17, 2023 at 3:00:00 PM App Note by Dimitri Danyuk Headphone Amplifier Evaluation Board Read More March 17, 2023 at 3:00:00 PM Ansberry Named VP Michael Ansberry - VP for Process Engineering. Read More March 17, 2023 at 3:00:00 PM LSK489 Press Release Low-Capacitance Dual N-Channel JFET Read More March 17, 2023 at 3:00:00 PM Burning Amp Festival Burning Amp Festival - A DIY Audio Gathering Read More March 17, 2023 at 3:00:00 PM AEA AEA’s Ribbon Microphones & Linears’ JFETs Read More March 17, 2023 at 3:00:00 PM Millions of Devices in Stock! LS844 Monolithic Dual Small-Signal JFET, 3N163 Small-Signal MOSFET, LS320 BiFET and Many More! Read More

Discover an extensive array of application notes and white papers authored by the talented minds at Linear Systems, as well as contributions from our esteemed colleagues and friends. Immerse yourself in our carefully curated selection to stay informed and inspired. Articles & Books This is a space to tell users about yourself and your business. Let them know who you are, what you do, and what this website is all about. Double click to start editing. Articles FET Principles and Circuits, Part 1 to 4, by Ray Martson, Nuts and Volt 5/2000 Ray Marston Read More JFETs The New Frontier Part 1 Erno Borbely Read More Books Designing with Field Effect Transistors (Second Edition) 1990 ISBN 007057537-1 FET Technology and Applications 1989 ISBN 0824780507 View Read More Analog Circuit Design - A Tutorial Guide to Applications and Solution Analog Circuit Design, Volume 2 – Immersion in the Black Art of Analog Design Analog Circuit Design, Volume 3 – Design Note Collection View Read More An Introduction to Field Effect Transistors-by J. Watson PHD, University of Wales, Swansea-1970 Designing with Field Effect Transistors (First Edition) 1981 ISBN 9780070574496 View Read More Some Tips on Making a FETching Discrete Amplifier View Read More Designing Audio Power Amps, 2010, ISBN 007164024X The Audio Power Amplifier Design Handbook (Fifth Edition) View Read More Designing Audio Power Amps, 2010, ISBN 007164024X View Read More Piezoelectric Accelerometers with Integral Electronics includes noise analysis of JFET and MOSFET amplifier circuits ISBN 978-331908-0772 View Read More