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< 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 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.

< 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)

SD/SST210 SINGLE, HIGH SPEED N-CHANNEL LATERAL DMOS FET SWITCH < Back SD/SST210 Series SD210 SINGLE, HIGH SPEED N-CHANNEL LATERAL DMOS FET SWITCH The SD/SST210 Series is a Single, High Speed N-Channel Lateral DMOS FET Switch, 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 . It 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: SD210DE TO-72 4L RoHS SD214DE TO-72 4L RoHS SST210 SOT-143 4L RoHS SST214 SOT-143 4L RoHS Datasheet Spice Model Applicaton Notes

< Back Military Sensors White Paper Linear Systems Mar 17, 2023 Linear Systems' White Paper Describes Lowest Noise Amplification for Sensor Signal Chains FREMONT, Calif., May 27, 2021 /PRNewswire/ -- Linear Systems, a world class producer of ultra low noise JFETS and semiconductors, has released an application note on creating low-noise signal chains for military sensors. The paper, "Military Higher-Performance Sensor Signal Chains," offers engineers solutions using ultra-low-noise discrete components added to an IC-based circuit to produce the better-performing signal chains in sensitive applications. Included are key applications with reference designs such as: Piezoelectric Element Preamps; Hydrophones; Accelerometers; Photodiode Preamps; and other types of sensors where discrete components are uniquely capable of performing critical initial amplification of sensor signals. "Better sensor systems enable earlier threat detection and more effective countermeasures, " Mr. Tim McCune said. "Our ultra-low-noise JFETS enable designers to build more sensitivity and capability into their sensor systems. This improved capability translates directly into greater value to the end users of these sensors." Linear Systems is a designer, manufacturer and seller of precision, high-performance, small-signal discrete semiconductors. A Silicon Valley company founded in 1987, it produces ultra-low-noise, monolithic dual and single JFETs and bipolar transistors, along with high-speed DMOS switches, small-signal MOSFETs, ultra-low leakage diodes and BiFET amplifiers. These parts have been designed into world-class products in the areas of: Test & Measurement, Audio, Scientific Optical, Military Sensor; Industrial Controls; and Hybrids. The White Paper can be downloaded at: High-Performance Military Sensor Signal Chains Data sheets, applications notes, SPICE models and other information can be downloaded at www.linearsystems.com . For More Information: Call Linear Systems toll free phone number: (800) 359-4023, regular business line: (510) 490-9160 or fax: (510) 353-0261. Email: sales@linearsystems.com Website: www.linearsystems.com SOURCE Linear Integrated Systems

DFN PACKAGE, SINGLE N-CHANNEL JFET SWITCH < Back 4391DFN Series DFN PACKAGE, SINGLE N-CHANNEL JFET SWITCH 4391DFN Series Single, Low Noise, N-Channel JFET Switch is a direct replacement for the Siliconix-Vishay equivalent part. It is ideal for Low Noise, High Gain, Low resistance Switching and Amplifier Applications. Available in the DFN 8L RoHS, TO-92 3L RoHS, TO-18 3L RoHS and SOT-23 3L 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: PN4391 TO-92 3L RoHS PN4392 TO-92 3L RoHS PN4393 TO-92 3L RoHS 2N4391 TO-18 3L RoHS 2N4392 TO-18 3L RoHS 2N4393 TO-18 3L RoHS SST4391 SOT-23 3L RoHS SST4392 SOT-23 3L RoHS SST4393 SOT-23 3L RoHS 2N4391 DIE 2N4392 DIE 2N4393 DIE Datasheet Spice Model Application Notes

J111 SERIES LOW LEAKAGE, N-CHANNEL JFET SWITCH < Back J/SST111 Series J111 SERIES LOW LEAKAGE, N-CHANNEL JFET SWITCH The J/SST111 Series Low Leakage, N-Channel JFET Switch is a direct replacement for the Siliconix-Vishay equivalent part. It is ideal for fast switching, low leakage, switching applications. Available in the TO-92 3L RoHS and SOT-23 3L RoHS package, as well as in die from. 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: J111 TO-92 3L RoHS J112 TO-92 3L RoHS J113 TO-92 3L RoHS SST111 SOT-23 3L RoHS SST112 SOT-23 3L RoHS SST113 SOT-23 3L RoHS J111 Die J112 Die J113 Die Datasheet Spice Model Application Notes

TIGHT MATCHING, MONOLITHIC DUAL, PNP TRANSISTOR < Back LS350 Series TIGHT MATCHING, MONOLITHIC DUAL, PNP TRANSISTOR Previous Next

< Back LSJ689 App Note Introduction The dual monolithic P-channel LSJ689 is the complement to the N-channel LSK489. Both devices feature low offset, low noise and low capacitance. They enable the efficient implementation of fully complementary input stages without many of the device matching requirements when pairs of discrete devices are employed. Used alone, the LSJ689 also enables the implementation of more traditional differential input stages in applications where P-channel devices are preferred. Features of the LJ689 include: Low noise on the order of 2 nV/Hz Low gate-drain capacitance, typically 3pF Low gate leakage current typically 3pA (Vds = 15V, Id = 1mA) Breakdown voltage of 50V o IDSS range of 5-20 mA Typical transconductance of 3mS at Id = 1mA This note covers the full-complementary input stage application for the LSJ689 in combination with the LSK489. Read More

< Back Bipolar Transistors Linear Systems Jul 16, 2024 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. Bipolar Transistors by Linear Systems Bipolar transistors are electronic devices that can amplify or switch electric signals. They consist of three layers of a semiconductor material, each with different properties. The two most common types of bipolar transistors are NPN and PNP. Linear Systems is a company known for producing high-quality bipolar transistors. Founded in 1984, it has become one of the leading manufacturers in the industry. In this article, we will discuss the features and benefits of using bipolar transistors by Linear Systems. Features One of the key features of bipolar transistors by Linear Systems is their low noise and high gain characteristics. This makes them ideal for use in audio amplifiers and other applications where low distortion is critical. Another feature of Linear Systems' bipolar transistors is their high current handling capability. They are designed to handle large currents, making them suitable for power electronics applications. Benefits The low noise and high gain properties of Linear Systems' bipolar transistors result in improved signal quality and better performance in electronic circuits. This is especially important in communication systems, where even the slightest amount of distortion can cause significant issues. Furthermore, due to their high current handling capability, these transistors provide efficient power management in electronic devices. This leads to lower power consumption and longer battery life. Applications Linear Systems' bipolar transistors have a wide range of applications in various industries. Some common uses include: Audio amplifiers and preamplifiers Power supplies Switching circuits Motor control circuits LED drivers These transistors are also used in communication systems, such as cell phones, radios, and televisions. Conclusion In conclusion, Linear Systems' bipolar transistors offer superior performance and reliability compared to other options on the market. Their low noise and high gain characteristics make them ideal for critical applications where signal quality is essential. Additionally, their high current handling capability allows for efficient power management and longer battery life. With a track record of excellence in the industry, it is no surprise that Linear Systems' bipolar transistors are trusted and widely used in a variety of electronic devices and systems. So, these transistors are an excellent choice for engineers and designers looking for high-quality components for their electronic projects. So, next time you need a bipolar transistor, consider using one from Linear Systems to ensure optimal performance and reliability in your circuit design. With their advanced technology and commitment to quality, you can trust that Linear Systems' bipolar transistors will meet your needs and exceed your expectations. Overall, these transistors offer numerous benefits and have a wide range of applications, making them an essential component in many electronic systems. View our Bipolar Transistors

< Back What are Current Regulating Diodes Linear Systems Oct 7, 2024 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. 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. How do they work? A standard diode allows current to flow freely in one direction and blocks it in the other direction. In contrast, a current regulating diode has a larger depletion region and a lower reverse breakdown voltage, which allows for more precise control of the current flow. When used in series with a load, the current regulating diode maintains a stable voltage drop across itself by varying its own resistance depending on the current flow. This means that as the load resistance changes, the voltage drop across the diode remains constant and therefore maintains a consistent current flow. Applications Current regulating diodes are commonly used in circuits where stable and precise current control is necessary, such as in LED lighting systems, battery charging circuits, and laser diode drivers. They can also be used as protection devices to limit the amount of current flowing through sensitive components. In addition, these diodes are often utilized in adjustable power supplies to regulate the output current and prevent damage to connected devices. Types of Current Regulating Diodes There are two main types of current regulating diodes: Zener diodes and avalanche diodes. Zener diodes operate in the reverse breakdown region, where they maintain a constant voltage despite changes in current flow. This makes them ideal for use as voltage regulators. Avalanche diodes, on the other hand, operate in the avalanche breakdown region and are used for higher voltage applications. They have a steeper current-voltage characteristic compared to Zener diodes, allowing for more precise control of the current flow. Advantages and Disadvantages The main advantage of using current regulating diodes is their ability to provide stable and accurate current control without the need for additional external components. This saves space and simplifies circuit design. However, one disadvantage is that these diodes can be sensitive to changes in temperature, which can affect their current regulation capabilities. In addition, they have a limited maximum current handling capacity, so they may not be suitable for high power applications. Conclusion In conclusion, current regulating diodes are essential components in many electronic circuits where precise and stable current control is necessary. They come in various types and offer advantages such as simplicity of use and compact size. However, care must be taken when using these diodes to ensure proper operation under different conditions. With continued advancements in technology, it is likely that we will see further improvements and developments in the field of current regulating diodes. So next time you encounter a circuit that requires precise current control, consider using a current regulating diode to achieve optimal performance. With their unique properties and benefits, these diodes are sure to play a significant role in the future of electronics. With the ever-growing demand for more efficient and reliable electronic devices, it is important to have a thorough understanding of different electronic components such as current regulating diodes. By having knowledge about their operation, advantages and limitations, you can make informed decisions when designing circuits for various applications. So keep exploring and learning about these fascinating components and discover new ways to incorporate them into your designs.

< Back DMOS Product Line Linear Systems Mar 17, 2023 DMOS Product Line Acquired from Vishay/Siliconix DMOS Product Line Linear Systems Re-Launches DMOS Product Line Acquired from Siliconix FREMONT, CA - 04/02/2020 Linear Systems announces the re-release of the SD-Series lateral DMOS switch product line acquired from Vishay/Siliconix in 2001. Built using the industry-leading proprietary DMOS process developed by Siliconix and transferred to Linear Systems, the SD-series uses lateral construction to achieve low capacitance and ultra-fast switching speeds (1ns max). “Our lateral DMOS products continue the tradition established by Siliconix with its design and production of these devices,” Mr. Tim McCune said. “The DMOS parts we produce meet every specification established by Vishay/Siliconix when they made them. The customers who relied on Siliconix for these parts transitioned smoothly to using ours, and we’ve welcomed many new customers since then.” These lateral DMOS switches are key components in a variety of high-performance analog circuits where ultra-fast, nano-second switching times are critical. Linear Systems is the only company to build these lateral DMOS parts using Siliconix’ proprietary polysilicon gate technology and is the only Vishay/Siliconix-approved replacement manufacturer. This fabrication process is key to the unique combination of speed and reliability of these parts. Linear Systems in 2001 reached an agreement with Vishay/Siliconix to produce these lateral DMOS parts after Vishay decided to exit that business. Under that agreement, LIS received mask sets, and process and technical information for the SD210, SD214, SST211, SST213, SST215, SD5000, SD5001, SD5400, and SD5401 product families from Siliconix. These parts are available in thru-hole, surface mount, die, ROHS, and Non-ROHS(Lead) for medical and military applications. Special testing is also available. “This line of lateral DMOS has been critical to a large number of high-end product developers, and it was important to Vishay that these customers not be forced to design these parts out, or use inferior ones,” McCune said. McCune noted Linear Systems’ lateral DMOS parts are used in a wide variety of military applications that require Non-ROHS parts as well as civilian applications. “The key performance parameters – switching time, low capacitance– are important in all applications,” he said. This product line is supported by an in-depth application note, detailed data sheets and recently developed SPICE models in the LTspice® format. For the application note, please visit: http://www.linearsystems.com/lsdata/others/DMOSAnalogSwitchIntroduction.pdf . For data sheets and SPICE models, please visit: http://www.linearsystems.com/product.html?category=dmoshss . 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 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, applications 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