Purchase Directly from Linear Systems Linear Systems offers direct sales to customers as well as through our network of authorized distributors, each with its own unique benefits. Contact us at (510) 490-9160 or sales@linearsystems.com for assistance with price quotes, samples, custom part discussions, drawing evaluations, and valuable insights. Contact Us! Purchase Directly from Authorized Distributors Customers have the option to order through Linear Systems' authorized distributors, ensuring access to our high-quality parts worldwide. Some distributors provide additional services such as design support, product screening, and testing. Purchasing directly from Linear Systems, or through our authorized distributors guarantees you receive genuine components and exceptional support tailored to your needs. Global Distributors Below are our International Distributors, shipping to locations worldwide. Linear Systems' Authorized Distributor, Micross Linear Systems' Authorized Distributor, NAC Semi Linear Systems' Authorized Distributor, Trendsetter Electronics Linear Systems' Authorized Distributor, Mouser Electronics Linear Systems Authorized Distributor, DigiKey Electronics Regional Distributors Should you wish to order from a distributor nearer to your location, kindly consult the following list, as we have distributors located around the world. Italy Schurter Electronics S.p.A. Email info.it@schurter.com Phone # +39 02 3046 5311 Website Germany, Switzerland & Austria SEMITRON W. Röck GmbH Distribution + Testhaus Email sales@semitron.de Phone # +49 7742 800-10 Website United States Trendsetter Electronics Email sales@trendsetter.com Phone # (512) 310-8858 Website United States NAC Semi Email sales@nacsemi.com Phone # (727) 828-0187 Website France CATS (Solutec & Microel) Email contact@cats-france.fr Phone # +33-1-69070824 or +33-1-69592150 Website India Electronic Enterprises (India) Private Limited Email eehyd@eeipl.in Phone # 040-23243352, 23240817 Website Germany AMU Electronics GmbH Email patrick.mueller@amu-electronics.com Phone # 05602/91947-59 Website Japan Kyokuto Boeki Kaisha Ltd. (KBK) Email eldv@kbk.co.jp Phone # +81-03-3244-3783 Website United Kingdom Micross Components - United Kingdom Email Darren.George@micross.com Phone # +44 (0)1603 788967 Website Finland Elgood Oy Email info@elgood.fi Phone # +358 207 981 140 Website Israel Gitronics/Boran Email support@boran.co.il Phone # +972-3-9274738 Website Austria IKE-Electronic E.U. Email office@ike-electronic.at Phone # +43 7448 21643 11 Website United States Micross Components Email sales@micross.com Phone # (855) 426-6766 Website United States NAC Semi Email sales@nacsemi.com Phone # (727) 828-0187 Website United Kingdom; Europe (excluding Germany, Austria, Switzerland) Anglia Email Info@anglia.com Phone # +44 (0) 1945 474747 Website Purchase Order Terms & Conditions Privacy Policy

MONOLITHIC DUAL, N-CHANNEL, JFET VOLTAGE CONTROLLED RESISTOR < Back VCR11N MONOLITHIC DUAL, N-CHANNEL, JFET VOLTAGE CONTROLLED RESISTOR The VCR11N Monolithic Dual, N-Channel, JFET Voltage Controlled Resistor is a direct Siliconix VCR11 Series. It is Ideal for Variable Resistor and Grain Control Applications. This part is available in the TO-71 4L 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: VCR11N TO-71 6L VCR11N SOT-23 6L VCR11N DFN 8L VCR11N Die Datasheet Spice Model Application Notes

< Back JFETs for VC Circuits Introduction Linear Integrated Systems manufactures a variety of FETs (Field Effect Transistors). In particular they have a variety of matched dual products. There are advantages in having matched devices. For example, if you are building a twochannel stereo audio product, having two or four devices in the same package allows for the two audio channels to be more closely matched. This paper will explore using FETs in voltage controlled circuits. Several approaches will be shown: 1. Using FETs as voltage controlled resistors. 2. Using FETs as voltage controlled amplifiers and active mixers. 3. Using FETs as voltage controlled phase shifters for processing music. 4. Using FETs as voltage controlled band pass filters. We will also explore ways to reduce nonlinearities or distortions and automatically bias the FETs. Read More

< 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 Linear Systems Capabilities Statement Linear Systems Jun 3, 2024 Who we are and what we do Founded in 1987, Linear Systems is a U.S.-owned, U.S.-based precision discrete semiconductor company. We specialize in developing and manufacturing high-quality, small-signal discrete devices for a variety of high-end applications, including test/measurement, instrumentation, space, military, medical, audio, and sensors. With a wide range of proprietary and standard components, we are committed to providing top-tier solutions to meet the demands of our diverse clientele. Download our Capabilities Statement to read the full document and discover how Linear Systems can meet your semiconductor needs. 2024 Capabilities Statement .pdf Download PDF • 378KB

< Back Millions of Devices in Stock! Linear Systems Mar 17, 2023 LS844 Monolithic Dual Small-Signal JFET, 3N163 Small-Signal MOSFET, LS320 BiFET and Many More! NEWS RELEASE FOR INFORMATION CONTACT: Linear Systems, Inc. Sales Department Phone: (510) 490-9160 Email: sales@linearsystems.com Linear Systems Announces Large-Scale Availability of Ultra Low Noise JFETs and Small-Signal Semiconductors FREMONT, Calif. – August 26, 2021 – Linear Systems, a world-class producer of ultra-low-noise JFETs and other small-signal discrete semiconductors, announces the large-scale availability of five of its top-performing components. These components, ranging from low-noise monolithic dual JFETs to small-signal MOSFETs, are available in wafer form in quantities ranging from one million to ten million for immediate packaging and shipment. All parts meet Linear Systems' industry-leading datasheet specifications and are available for fast delivery due to substantial buffer stock of wafers. Parts available for shipment include : 1. LS844 Monolithic Dual Small-Signal JFET: One million dice in wafer form in stock. This low-noise front-end amplifier features high Common Mode Rejection Ratio and excellent matching over a wide range of temperatures. [Download Data Sheet] 2. 3N163 Small-Signal MOSFET : Three million dice in wafer form in stock. Ideal for sensor applications such as gas detection and piezo devices, with half the noise of competitors' parts. [Download Data Sheet] 3. LS320 BiFET Amplifier: 1.3 million dice in wafer form in stock. A high-input impedance, single monolithic amplifier, designed as a direct replacement for Amperex equivalent parts. Perfect for high impedance sense amplifier applications. [Download Data Sheet] 4. 2N/PN/SST4391 N-Channel JFET Series: 2.5 million dice in wafer form in stock. This single, low-noise N-channel JFET switch is ideal for low-noise, high-gain, low-resistance switching and amplifier applications. [Download Data Sheet] 5. 2N/PN/SST4117A N-Channel JFET Series: 14.3 million dice in wafer form in stock. This single, low-capacitance, ultra-high-input-impedance N-channel JFET amplifier is a direct replacement for Fairchild, NXP, and Siliconix-Vishay parts. [Download Data Sheet] These parts are also available in bare die and sorted wafer form. In addition to these million-plus parts inventories, Linear Systems keeps substantial quantities of all its parts on hand, including the industry-leading LSK389 monolithic dual N-channel ultra-low-noise JFET. About Linear Systems Founded in 1987, Linear Systems is a Silicon Valley-based designer, manufacturer, and seller of precision, high-performance, small-signal discrete semiconductors. Linear Systems produces ultra-low-noise monolithic dual and single JFETs, bipolar transistors, high-speed DMOS switches, small-signal MOSFETs, ultra-low-leakage diodes, and BiFET amplifiers. These parts are designed into world-class products in fields such as Test & Measurement, Audio, Scientific Optical, Military Sensor, Hydrophone/Sonobuoys, Industrial Controls, and Hybrids. For these and other parts, download Linear Systems' [Product Selection Guide] and [Databook]. For more information, visit www.linearsystems.com .

< Back FAST SAMPLE AND HOLD Linear Systems Jun 10, 2024 In this interesting design, a strobe pulse sets the sample mode. Here's how it works: When the strobe pulse s —Strobe pulse will turn on JFET Q1 which allows the signal to be sampled to charge capacitor C1. When the strobe pulse returns to 0 V, JFET Q1 is turned off and capacitor C1 holds the voltage value of the sampled signal plus the offset voltage of MOSFET Q 2. The JFET used could be anyone of Linear Integrated Systems switch JFETs. Ideally the lower the drain -to-source voltage the better to reduce the offset voltage of the JFET. The output signal decays at a rate of 1 mV/s. From logic input of 531 op-amp IC2 turns on JFET Q1 to complete feedback loop to IC1, Q1, and Q2. Capacitor C1 charges to voltage equal to that of input signal plus gate-to-source offset voltage of Q2. At end of strobe time, feedback loop is broken and C1 holds voltage until time of next strobe pulse. Decay in output voltage between samplings is 1 mV/s.—"Signetics Analog Data Manual," Signetics, Sunnyvale, CA, 1977, p 643-644.

Linear Systems typically doesn't require visitors to provide personal information for website use. However, in certain cases, we may ask for it to facilitate future communications, purchases, or material requests. We reserve the right to collect and share personal information in response to violations, fraud, or actions that may harm our company, but otherwise, we do not share your information with third parties. Privacy Policy Collection of Personal Information Visitors to the Linear Integrated Systems' website are not required to reveal any personal information in order to use many of the features of the site. However, in some instances, Linear Systems requests that users provide certain personal information in order to facilitate future communications, make a purchase of Linear Systems' products, or receive other materials from Linear Systems. What does Linear Systems do with my personal information? Linear Systems will use the information you provide for legitimate business purposes which may include sharing some information with Linear Systems' authorized distributors. These legitimate business purposes may include facilitating future communications with you, assisting you in making a purchase of Linear Systems' products, or responding to your request for Linear Systems' information or samples. Linear Systems also reserves the right to collect and share personal information as part of an investigation or response to a violation of Linear Systems' terms and conditions, fraud, illegal activities or other actions or threats which may damage Linear Systems. Except the aforementioned instances, Linear Systems will never share your personal information with third parties. Rev. A 03202023 Home

GENERAL PURPOSE, LOW-NOISE, LOW-COST, SINGLE N-CHANNEL JFET, REPLACEMENT FOR THE BF510 < Back LSBF510 GENERAL PURPOSE, LOW-NOISE, LOW-COST, SINGLE N-CHANNEL JFET, REPLACEMENT FOR THE BF510 The LSBF510 is a low-cost N-Channel JFET. Features include low leakage, very low noise, low cutoff voltage (VGS(off) ≤ 2.5V) and high Gain (AV = 80 V/V) for use with low-level power supplies. The LSBF510 is excellent for battery powered equipment and low current amplifiers. The TO-236 (SOT-23) package provides surface-mount capability. The LSBF510 is available in tape-and-reel for automated assembly and in die form for automated assembly. 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: LSBF510 SOT-23 3L RoHS LSBF510 Die Datasheet Spice Model Application Notes

< 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.

SINGLE, LOW CAPACITANCE, ULTRA-HIGH INPUT IMPEDANCE, N-CHANNEL JFET AMPLIFIER < Back 2N/PN/SST4117 Series SINGLE, LOW CAPACITANCE, ULTRA-HIGH INPUT IMPEDANCE, N-CHANNEL JFET AMPLIFIER The 2N/PN/SST4117 Series Single, Low Capacitance, Ultra-High Input Impedance, N-Channel JFET Amplifier is a direct replacement for the Fairchild, NXP and Siliconix-Vishay equivalent part series. It is ideal for high input impedance applications. Available in the TO-72 4L, TO-92 3L 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: 2N4117 TO-72 4L RoHS 2N4118 TO-72 4L RoHS 2N4119 TO-72 4L RoHS PN4117 TO-92 3L RoHS PN4118 TO-92 3L RoHS PN4119 TO-92 3L RoHS SST4117 SOT-23 3L RoHS SST4118 SOT-23 3L RoHS SST4119 SOT-23 3L RoHS 2N4117 Die 2N4118 Die 2N4119 Die Datasheet Spice Model Application Notes

Linear Systems designs and manufactures the highest-performance line of monolithic dual JFET amplifiers in the industry. JFET Amplifiers Dual Linear Systems designs and manufactures the highest-performance line of monolithic dual JFETs in the industry. The largest line of dual JFETs in the industry, these components use our unique monolithic design that weaves the two devices together over a common substrate. This approach provides the highest possible matching over a wide ranges of temperatures and very high Common-Mode Rejection Ratios. Our design eliminates parasitic capacitance issues that arise with composite dual JFET devices. LSK389 Series LOW NOISE, MONOLITHIC DUAL, N-CHANNEL JFET Read More LSJ689 LOW NOISE, LOW CAPACITANCE MONOLITHIC DUAL P-CHANNEL JFET Read More LS5911 Series WIDEBAND, HIGH GAIN, MONOLITHIC DUAL, N-CHANNEL JFET Read More 2N/LS3954 Series LOW NOISE, LOW DRIFT, MONOLITHIC DUAL, N-CHANNEL JFET Read More 2N/LS5905 Series LOW-LEAKAGE, LOW-DRIFT, MONOLITHIC DUAL, N-CHANNEL JFET AMPLIFIER Read More LSK489 Series: Precision Dual JFETs LOW CAPACITANCE MONOLITHIC DUAL N-CHANNEL JFET Read More SST/U421 Series LOW LEAKAGE, LOW DRIFT, MONOLITHIC DUAL N-CHANNEL JFET Read More LS840 Series LOW-NOISE, LOW-DRIFT, LOW CAPACITANCE, MONOLITHIC DUAL N-CHANNEL JFET AMPLIFIER Read More SST/U401 Series LOW-NOISE, LOW-DRIFT, MONOLITHIC DUAL N-CHANNEL JFET AMPLIFIER Read More SST/U440 Series WIDEBAND, HIGH GAIN, MONOLITHIC DUAL N-CHANNEL JFET AMPLIFIER Read More LSK589 LOW NOISE, LOW CAPACITANCE MONOLITHIC DUAL N-CHANNEL JFET Read More LS844 Series ULTRA-LOW NOISE, LOW-DRIFT, MONOLITHIC DUAL N-CHANNEL JFET AMPLIFIER Read More LS830 Series ULTRA-LOW LEAKAGE, LOW DRIFT, MONOLITHIC DUAL N-CHANNEL JFET Read More 2N5564 Series LOW NOISE, MONOLITHIC DUAL, N-CHANNEL JFET Read More