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< Back LSK389 Press Release Linear Systems Mar 17, 2023 Ultra-Low Noise, Monolithic Dual, N-Channel JFET NEWS RELEASE FOR INFORMATION CONTACT: Linear Systems, Inc. Sales Department Phone: (510) 490-9160 Email: sales@linearsystems.com Industry’s First 100% Noise Tested, Ultra-Low Noise, Monolithic Dual, N-Channel JFET FREMONT, CA – 01/21/2020 – Linear Systems announces the re-release of their most popular part, the LSK389 Series, Ultra-Low Noise, Monolithic Dual, N-Channel JFET, now 100% tested to meet or exceed noise specifications. The LSK389 is the lowest noise Junction Field Effect Transistor (JFET) in its class and has been used in ultra-high-end applications for over a decade. The LSK389 enables developers to create the lowest noise signal chains possible for sensors, professional audio equipment, and other applications. Linear Systems is releasing the LSK389 after developing the capability for individual screening of small-signal discrete components to levels below a billionth of a volt (nV/√Hz) of noise in quantities up to tens of thousands of parts. This testing capability – the only one in existence worldwide – ensures all LSK389s leaving the factory produce no burst (RTN or popcorn) noise and meet or exceed 1/f and broadband noise specifications. The LSK389, Ultra-Low Noise, Monolithic Dual, N-Channel JFET provides designers with a better-performing solution for obtaining tighter IDSS matching and better thermal tracking than using individual JFETs or non-monolithic dual JFETs. The part is an ideal combination of high transconductance, ultra-low noise, and relatively low input capacitance. The LSK389 is the lead part of Linear Systems’ family of low-noise JFETs. The LSK170 is the N-channel single version of the LSK389, and the LSJ74 is the P-channel counterpart to the LSK170. The N-channel dual LSK489 has slightly higher noise but lower input capacitance than the LSK389, and the LSJ689 is its P-channel dual counterpart. All Linear Systems’ JFET standard products have substantially lower noise than those made by other manufacturers and are marketed under the Improved Standard Products® trademark. Summary of Features: - Ultra-Low Noise: en = 1.3nV/√Hz (typ), f = 1.0kHz and NBW = 1.0Hz - Four grades of IDSS: 2.6-6.5mA, 6.0-12.0mA, 10.0-20.0mA, and 17-30mA, with an IDSS match of 10% - Tight Matching: IVGS1-2I = 15mV max - High Breakdown Voltage: BVGSS = 40V max - High Gain: Gfs = 20mS (typ) - Relatively Low Capacitance: 25pF (typ) - Available in surface mount SOIC 8L and thru-hole TO-71 6L packages Benefits: - Improved Signal Chain Noise Performance - Better Matching and Thermal Tracking Due to Unique Monolithic Interleaved Dual Design Construction - Better Performance for Battery-Operated Applications by Providing a Wide Output Swing Applications: - Ultra-Sensitive Sensor Applications - Audio Amplifiers and Preamps - Discrete Low-Noise Operational Amplifiers - Battery-Operated Audio Preamps - Audio Mixer Consoles - Sonic Imaging - Instrumentation Amplifiers - Microphones - Sonobuoys - Hydrophones - Chemical and Radiation Detectors Pricing and Availability: - 1,000+ pieces of the LSK389A SOIC 8L package are priced at $4.67 (USD) each. - 1,000+ pieces of the LSK389A TO-71 6L package are priced at $6.70 (USD) each. Prices vary based on grade (A, B, C, and D) and quantity. -Availability: Production quantities are available now. -Delivery: Factory stock to 8 weeks. For more information: Phone: (510) 490-9160 Email: sales@linearsystems.com Website: www.linearsystems.com

< Back Design Specs for JFETs Introduction Junction field effect transistors (JFETs) are used and are useful in many different circuit topologies. Because these devices function as voltage controlled current sources (VCCS) as opposed to current controlled current sources (CCCS), they offer designers certain flexibilities in designs not available when using bipolar transistors (which are CCCS devices). JFETs can also be used as voltage controlled variable resistors and voltage-controlled switches. JFETs have extremely high input impedances (on the order of giga-ohms) and extremely low input leakage currents (on the order of pico-amps). Selected parts are designed to have excellent performance in high and very high frequency (VHF) circuits. Read More

Linear Systems designs and manufactures the highest-performance line of monolithic dual JFETs in the industry. Contact us for a quote! Back LSJ689 LOW NOISE, LOW CAPACITANCE MONOLITHIC DUAL P-CHANNEL JFET The LSJ689 High Performance, P-Channel, Monolithic Dual JFET features extremely low noise, tight offset voltage and low drift over temperature. It is targeted for use in a wide range of precision instrumentation applications. The SOT-23 6L, TO-71 6L, SOIC 8L and DFN 8L packages provide ease of manufacturing and the symmetrical pinouts prevent improper orientation. The LSJ689 is also available in die form. SOT-23 6L, SOIC 8L and DFN 8L packages are available in tape & reel, compatible with automatic assembly methods. 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: LSJ689 TO-71 6L RoHS LSJ689 SOIC 8L RoHS LSJ689 SOT-23 6L RoHS 689 DFN 8L RoHS LSJ689 Die Datasheet Spice Model Application Notes

GENERAL PURPOSE < Back LS190 GENERAL PURPOSE The LS190 is a General Purpose Single N-Channel JFET Amplifier. This part is available in the TO-92 3L package, as well as the SOT-89 3L package. 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. Datasheet Spice Model Application Notes

< Back Interfacing Sensors & Transducers Introduction Abstract: A discussion of methods of amplifying and signal-conditioning for sensors with low level outputs in the presence of high ambient electrical noise sources. Advantages and disadvantages of some common amplifier circuits are considered. Read More

< Back LTspice Press Release Linear Systems Mar 17, 2023 Linear Systems' JFETs in LTspice NEWS RELEASE FOR INFORMATION CONTACT: Linear Systems, Inc. Sales Department Phone: (510) 490-9160 Email: sales@linearsystems.com LTspice® Designers Now Have Access to Industry's Lowest Noise Part s FREMONT, Calif., March 3, 2020 – Linear Systems is announcing the inclusion of models for its JFET, bipolar, and small-signal MOSFETs in the LTspice® embedded library. Linear Systems' JFETs are now the primary selection option in LTspice®, and the company's other parts are also among the highest-performance options available in the simulation program's library. LTspice® is the premiere circuit simulation software, and Linear Systems' parts enable designers to create the lowest noise signal chains possible. Being included in the embedded library showcases these parts within LTspice®, making it easier for engineers to design the best possible products. Linear Systems specializes in the development and manufacture of precision, ultra-low-noise small-signal discrete components. Its parts, such as the LSK389 and LSK489, are used in highly demanding sensor systems ranging from the Large-Scale Synoptic Telescope to piezoelectric devices to sonobuoys. These parts also provide the front-end amplification for high-end test and measurement, medical, and audio equipment. SPICE models for Linear Systems' parts have been available previously, but users of LTspice® and other simulation software needed to manually add the models. Including the models in the LTspice® embedded library enables designers to use them in new designs with a simple mouse click. 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, MOSFETs, PhotoFETS, and Voltage-Controlled Resistors. Datasheets, application notes, SPICE models, and additional information can be downloaded at www.linearsystems.com. For customer service, contact Linear Systems at sales@linearsystems.com or call (510) 490-9160. LTspice® is owned by Analog Devices, Inc. For more information, please visit: [LTspice® at Analog Devices](https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html)

SD211DE SINGLE, HIGH-SPEED N-CHANNEL LATERAL DMOS FET SWITCH < Back SD/SST211 Series SD211DE SINGLE, HIGH-SPEED N-CHANNEL LATERAL DMOS FET SWITCH The SD/SST211 Series is a Single, High-Speed N-Channel Lateral DMOS FET Switch with Zener Diode Protection, ideal for Ultra-High Speed Switching Applications. Linear Systems acquired the Siliconix Lateral DMOS FET Switch product line, so our version is the same maskset, same process and is an exact pin-for-pin replacement. The series is available in the TO-72 4L RoHS and SOT-143 4L 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: SD211DE TO-72 4L RoHS SD213DE TO-72 4L RoHS SD215DE TO-72 4L RoHS SST211 SOT-143 4L RoHS SST213 SOT-143 4L RoHS SST215 SOT-143 4L RoHS Datasheet Spice Model Applicaton Notes

Welcome to our Literature page, where you can delve into a treasure trove of white papers and application notes covering our range of parts. Explore insights on ultra-low noise JFETs, DMOS, Current Regulating Diodes, JFET Switches, and low-leakage diodes, all designed to empower your understanding of our products. Literature Linear Systems offers an extensive library of technical resources tailored for analog circuit designers. Our collection includes detailed data books, product selection guides, cross-references, datasheets, original application notes, and white papers. This comprehensive literature serves as an invaluable reference for engineers, students, and hobbyists seeking to optimize their signal chain designs. By providing in-depth insights into small-signal discrete semiconductors and JFET applications, our materials empower you to create efficient and innovative analog circuits. Explore our resources to enhance your design process and stay at the forefront of analog technology. Datasheets Linear Systems provides detailed datasheets summarizing our components’ performance in ways to assist designers seeking to find the right part quickly. Our data sheets include typical/minimum/maximum performance data, along with an array of curves illustrating part performance so designers understand how these devices will contribute to overall system performance. Cross Reference Linear Systems continues to produce a wide range of JFET, DMOS and other standard products also previously manufactured by Siliconix, Fairchild and other companies. This cross reference provides buyers with a tool to quickly find replacements for discontinued standard products. Application Notes Linear Systems has a wide range of application notes written by top industry professionals to assist designers in making optimal use of our components in their products.

< Back FETs for Sensor Applications Introduction Linear Systems provides a variety of FETs (Field Effect Transistors) suitable for use in low noise amplifier applications for photo diodes, accelerometers, transducers, and other types of sensors. In particular, low noise JFETs exhibit low input gate currents that are desirable when working with high impedance devices at the input or with high value feedback resistors (e.g., ≥1MΩ). Operational amplifiers (op amps) with bipolar transistor input stages have much higher input noise currents than FETs. In general, many op amps have a combination of higher noise and input capacitance when compared to some discrete FETs. For example, a typical FET input op amp may have input capacitances of about 20 pF, whereas many discrete FETs have input capacitances of less than 5 pF. Also, there are few low noise FET input op amps that have equivalent input noise voltages density of less than 4 nV/ 𝐻𝑧. However, there are a number of discrete FETs rated at ≤ 2 nV/ 𝐻𝑧 in terms of equivalent Input noise voltage density. For those op amps that are rated as low noise, normally the input stages use bipolar transistors that generate much greater noise currents at the input terminals than FETs. These noise currents flowing into high impedances form added (random) noise voltages that are often much greater than the equivalent input noise. Read More

< Back BIFET Amplifiers Linear Systems Sep 26, 2024 BIFET amplifiers are a type of operational amplifier (op-amp) that use bipolar junction field-effect transistors (BJFETs) as their input stage. Introduction BIFET amplifiers are a type of operational amplifier (op-amp) that use bipolar junction field-effect transistors (BJFETs) as their input stage. These types of amplifiers have been popular for many years because they offer low bias currents, high input impedance and excellent linearity. In this article, we will discuss the key features of BIFET amplifiers, how they differ from other op-amps, and some common applications where they are used. What is a BIFET Amplifier? As mentioned earlier, BIFET amplifiers use BJFETs as their input stage instead of traditional MOSFETs or BJTs. BJFETs are known for their high input impedance and low noise, making them suitable for use in audio amplifiers and other sensitive applications. One of the main advantages of BIFET amplifiers is their low bias currents, which can be as low as a few femtoamps (10^-15 amps). This allows for higher precision in measuring small signals without introducing additional error. How do BIFET Amplifiers Differ from Other Op-Amps? BIFET amplifiers have several key differences compared to traditional op-amps. These include: Input Stage: As mentioned earlier, BIFET amplifiers use BJFETs instead of MOSFETs or BJTs as their input stage. This allows for higher input impedance and lower bias currents. Biasing: BIFET amplifiers typically use a single positive power supply, unlike other op-amps which may require dual supplies. This makes them more convenient to use in certain applications. Output Stage: The output stage of a BIFET amplifier is usually a MOSFET or BJT, providing high output current and low output impedance. This allows for driving larger loads without significant signal loss. Applications of BIFET Amplifiers BIFET amplifiers are commonly used in audio applications due to their low noise and high linearity. They are also popular in medical and scientific instrumentation where precision measurements are required. Other applications of BIFET amplifiers include: Sensor Signal Conditioning: The high input impedance and low bias currents make BIFET amplifiers ideal for conditioning signals from sensors such as thermocouples, strain gauges, and photodiodes. Active Filters: BIFET amplifiers can be used to create active filters with better performance compared to traditional op-amps. They also have lower power consumption, making them suitable for battery-powered applications. Data Acquisition Systems: BIFET amplifiers are commonly used in data acquisition systems due to their low noise and high precision. They can amplify small signals from sensors before being digitized for processing. Conclusion BIFET amplifiers offer several advantages over traditional op-amps, making them suitable for a variety of applications. They provide high input impedance, low bias currents, and high output current capabilities. These features make BIFET amplifiers ideal for use in audio, sensor signal conditioning, active filters, and data acquisition systems. As technology continues to advance, we may see further improvements in BIFET amplifier design and their application in various industries. So, it is important to stay updated with the latest developments in this field to fully utilize the potential of BIFET amplifiers.

< Back High Temp Products Linear Systems Mar 17, 2023 High Temp Discrete Products High Temperature Product Capability Original Post: https://www.prnewswire.com/news-releases/linear-systems-to-showcase-high-temperature-product-capability-at-the-offshore-technology-conference-2019-300839508.html FREMONT, Calif., April 29, 2019 /PRNewswire/ -- Linear Integrated Systems, Inc. (Linear Systems) will be showcasing its High Temperature Products capability at the Trendsetter Electronics Booth #4728 , at the Offshore Technology Conference (OTC) being held May 7 through May 9 at the NGR Park, Houston, Texas. These High Temperature Discrete Products enable designers to create custom discrete operational amplifiers when seeking a solution to improve the performance of their applications, when off the shelve operational amplifiers are not good enough. The Linear Systems' JFET product line is one of the largest in the industry and continues to expand. The unique Linear Systems' monolithic dual construction allows for two JFETs to be located on one piece of silicon, as compared to two individual pieces of silicon. The result is improved room temperature matching as well as improved matching/tracking over high temperature. Linear Systems' JFETs are available in various types: Ultra Low Noise (1.9nv-typ), High Impedance, Pico Amp Leakage, and High Frequency. The JFET product line includes both N-Channel Monolithic Duals and Singles and P-Channel Monolithic Duals and Singles for Amplifier and Switching Applications. Linear Systems will be available to discuss this capability and its line of precision small-signal discrete components at the OTC event. The event showcases offshore drilling, exploration, production and environmental protection manufacturers. Linear Systems specializes in the development and manufacture of precision, ultra-low-noise small-signal discrete components. Its parts, such as the LSK389 and LSK489, are used in highly demanding sensor systems ranging from the Large-Scale Synoptic Telescope to piezoelectric devices to sonobuoys. These parts also provide the front-end amplification for down hole, high-end test and measurement, sensor, medical and professional audio equipment. Linear Systems is a full-service, privately-held, 32-year-old 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 consists of: Ultra-Low-Noise JFETs: N-Channel and P-Channel Monolithic Dual and Single, High-Speed Lateral DMOS Switches, Bipolar Transistors : Monolithic Dual and Single, BIFET Amplifiers, Current-Regulating Diodes, Pico Amp-Leakage Diodes, MOSFETs: N-Channel and P-Channel Monolithic Dual and Single, PhotoFETS, and Voltage Controlled Resistors. Data sheets, application notes, SPICE models and other information can be downloaded at linearsystems.com . For more information about Linear Systems please contact Ms. Laura Madonna at laura@linearsystems.com . For customer service, please contact Linear Systems at sales@linearsystems.com or call (510) 490-9160. SOURCE Linear Integrated Systems Related Links www.linearsystems.com

MONOLITHIC DUAL, NPN TRANSISTOR < Back IT124 MONOLITHIC DUAL, NPN TRANSISTOR Previous Next