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< 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

< 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

Linear Systems designs and manufactures the highest-performance line of monolithic dual JFETs in the industry. Contact us for a quote! Back LS844 Series ULTRA-LOW NOISE, LOW-DRIFT, MONOLITHIC DUAL N-CHANNEL JFET AMPLIFIER The LS844 Series Ultra-Low Noise, Low-Drift, Monolithic Dual N-Channel JFET Amplifier is a pin-for-pin replacement for the Fairchild, Motorola, National and Siliconix-Vishay part series. Available in the TO-71 6L, TO-78 6L, PDIP 8L 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: LS844 TO-71 6L RoHS LS845 TO-71 6L RoHS LS844 TO-78 6L RoHS LS845 TO-78 6L RoHS LS844 PDIP 8L RoHS LS845 PDIP 8L RoHS LS844 SOIC 8L RoHS LS845 SOIC 8L RoHS LS844 Die LS845 Die Datasheet Spice Model Application Notes

< Back Mike Ansberry: VP of Manufacturing and General Manager Linear Systems Jan 13, 2025 Mike Ansberry Named VP of Manufacturing and General Manager at Linear Systems FOR IMMEDIATE RELEASEContact: Sales@linearsystems.com Phone: (510) 490-9160Website: www.linearsystems.com ANSBERRY NAMED VP OF MANUFACTURING AND GENERAL MANAGER AT LINEAR INTEGRATED SYSTEMS FREMONT, CA – January 13, 2025 – Linear Integrated Systems, Inc. , is excited to announce the promotion of Michael Ansberry to Vice President of Manufacturing and General Manager. Ansberry will oversee all aspects of the company’s semiconductor fabrication operations, driving strategy, innovation, and efficiency across the organization. In this expanded role, Ansberry will lead the development of strategies to select, allocate resources, and prioritize fabrication partners and vendors. He will conduct periodic SWOT analyses to ensure alignment with the company’s goals and reallocate projects based on agreed-upon metrics. Additionally, he will prioritize New Product Introduction (NPI) efforts, assigning resources to support project success, while spearheading continuous improvement initiatives to meet Linear Systems’ financial objectives. Ansberry joined Linear Systems in 2018 as Vice President of Manufacturing, bringing extensive experience in semiconductor operations. His new responsibilities as General Manager reflect his outstanding contributions and leadership. Before joining Linear Systems, Ansberry served as Director of Operations at Lumileds, a global leader in LED technology for automotive, general, and specialty lighting applications. His career also includes process engineering roles at Sipex, Micro Power Systems, and other Silicon Valley semiconductor companies, showcasing a deep understanding of both operations and engineering. “This new role is an exciting opportunity to help Linear Systems reach new heights,” said Ansberry. “I’m looking forward to strengthening our relationships with fabrication partners, streamlining operations, and continuing to deliver the world-class semiconductors our customers rely on.” Linear Systems CEO Cindy L. Johnson expressed confidence in Ansberry’s expanded role. “Mike has proven himself to be an invaluable leader in our organization. His extensive experience and dedication to excellence have been pivotal to our success. In his new role, I’m confident Mike will continue to drive innovation and operational efficiency.” Founded in 1987 by John M. Hall, Cindy L. Johnson, and John H. Hall, Linear Integrated Systems, Inc. is a privately held designer and manufacturer of small-signal discrete semiconductors based in Fremont, CA. John H. Hall, a co-founder of Intersil and the founder of Micro Power Systems, brought significant expertise and innovation to the company. Linear Systems offers a diverse product line, including Dual JFET Amplifiers , Single JFET Amplifiers , JFET Switches , DMOS High Speed Switches , Low Leakage Diodes , Current Regulating Diodes , Bipolar Transistors , MOSFETs , Voltage Controlled Resistors and BIFET Amplifiers . Visit www.linearsystems.com to download our 2024 Data Book , Cross Reference Guide , datasheets, SPICE models, application notes , and more. Stay connected and join our growing LinkedIn community for updates and insights. You can also follow us on YouTube , Facebook , Instagram and X . Contact: sales@linearsystems.com Phone: (510) 490-9160 Website: www.linearsystems.com

SINGLE P-CHANNEL JFET SWITCH < Back LSJ/SST94 SINGLE P-CHANNEL JFET SWITCH The LSJ/SST94 Single, Ultra-Low noise, P-Channel JFET Amplifier is a direct replacement for the Toshiba 2SJ94. It is ideal for Ultra-Low Noise Audio/Acoustic Applications. Available in the TO-92 3L RoHS, SOT-89 3L RoHS, 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: LSJ94 TO-92 3L RoHS SST94 SOT-23 3L RoHS LSJ94 Die Datasheet Spice Model Application Notes

LOW NOISE N-CHANNEL JFET GENERAL PURPOSE AMPLIFIER < Back J/SST210 Series LOW NOISE N-CHANNEL JFET GENERAL PURPOSE AMPLIFIER The J/SST210 Series Single, Low Noise, N-Channel JFET, General Purpose Amplifier is a direct replacement for Fairchild, NXP and Siliconix-Vishay equivalent part. It is ideal for General Purpose and Low Noise Applications. Available in the TO-92 3L RoHS, 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: J210 TO-92 3L RoHS J211 TO-92 3L RoHS J212 TO-92 3L RoHS SST210 SOT-23 3L RoHS SST211 SOT-23 3L RoHS SST212 SOT-23 3L RoHS J210 Die J211 Die J212 Die Datasheet Spice Model Application Notes

SD5000 SERIES QUAD, HIGH SPEED N-CHANNEL, LATERAL DMOS FET SWITCH < Back SD5000 Series SD5000 SERIES QUAD, HIGH SPEED N-CHANNEL, LATERAL DMOS FET SWITCH The SD5000 is a Quad, 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 parts are the same maskset, process and are an exact pin-for-pin replacement. This series is available in the PDIP 16L RoHS, SOIC 14L RoHS and S/B DIP 16L 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: SD5000I PDIP 16L RoHS SD5000N PDIP 16L RoHS SD5001N PDIP 16L RoHS SD5400CY SOIC 14L RoHS SD5401CY SOIC 14L RoHS SD5000I S/B DIP 16L RoHS SD5000 Die SD5001 Die SD5400 Die SD5401 Die Datasheet Spice Model Applicaton Notes

< Back MOSFETs Linear Systems Jul 9, 2024 Linear Systems’ small signal MOSFETs consist of two MOSFETs on the same piece of silicon resulting in better matching and better performance over temperature. In the world of electronics, MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) are a type of field-effect transistor that have become increasingly popular due to their ability to handle high power and voltage levels. They are an essential component in many electronic devices and systems, making them an important topic for anyone interested in electrical engineering. Linear Systems, a renowned electronics company, is well-known for its production of high-quality MOSFETs. In this article, we will explore the basics of MOSFETs and dive into the specific features and advantages offered by Linear Systems' MOSFETs. What is a MOSFET? A MOSFET is a type of transistor that works by controlling the flow of current between the source and drain terminals using an electric field. The electric field is created by applying a voltage to the gate terminal, which is separated from the channel (where the current flows) by a thin layer of insulating material. There are two main types of MOSFETs: N-channel and P-channel. In an N-channel MOSFET, a negative voltage applied to the gate creates an electric field that allows current to flow between the source and drain terminals. In a P-channel MOSFET, a positive voltage applied to the gate has the same effect. Features of Linear Systems' MOSFETs Linear Systems takes pride in producing high-quality MOSFETs that offer a range of features and advantages. Here are some notable ones: High Power Handling: Linear Systems' MOSFETs can handle high power levels, making them suitable for use in various applications such as power supplies and motor drivers. Low On-State Resistance: The on-state resistance (RDS(on)) is an important parameter that determines the efficiency of a MOSFET. With its advanced design and manufacturing processes, Linear Systems' MOSFETs have low RDS(on) values, leading to reduced power losses and improved performance. Fast Switching Speed: Another critical factor in MOSFET performance is switching speed. Linear Systems' MOSFETs have fast switching speeds, allowing for efficient control of current flow and reducing the risk of thermal damage. Low Gate Threshold Voltage: The gate threshold voltage is the minimum voltage required to turn on a MOSFET. With low gate threshold voltages, Linear Systems' MOSFETs can be easily controlled by lower voltage signals, making them suitable for use in low-power applications. High Temperature Operation: Linear Systems' MOSFETs are designed to operate at high temperatures without sacrificing performance or reliability. This makes them ideal for use in harsh environments where other components may struggle to function properly. Advantages of Using Linear Systems' MOSFETs In addition to their features, Linear Systems' MOSFETs also offer several advantages over other types of transistors: Lower Cost: Compared to bipolar junction transistors (BJTs), MOSFETs are typically less expensive to produce. This cost-saving is passed onto customers, making Linear Systems' MOSFETs a more economical option for many applications. Less Power Consumption: MOSFETs have lower power consumption compared to BJTs due to their high input impedance and low leakage currents. This results in lower operating costs and improved energy efficiency for devices that use them. Smaller Size: Due to their small size and simplified manufacturing process, MOSFETs can be made in much smaller packages compared to BJTs. This makes them ideal for use in compact devices or applications where space is limited. High Reliability: Linear Systems' MOSFETs are highly reliable and have a long lifespan, making them suitable for use in critical systems that require continuous operation. They also have built-in protection features such as overvoltage and overcurrent protection, further increasing their reliability. Applications of Linear Systems' MOSFETs Due to their numerous advantages, Linear Systems' MOSFETs find use in various applications across different industries: Power Electronics: MOSFETs are commonly used in power electronics, such as motor drives and power supplies. Their high switching speed and low on-resistance make them well-suited for these applications. Automotive Industry: MOSFETs are also used extensively in the automotive industry due to their ability to handle high currents and voltages. They can be found in various components of vehicles, including ignition systems, electric windows, and electronic control units. Consumer Electronics: Many consumer electronics devices use MOSFETs, such as smartphones, laptops, and televisions. Their small size and low power consumption make them ideal for use in portable devices where space is limited. Industrial Automation: MOSFETs are commonly used in industrial automation systems, such as motor controllers and power inverters. Their high efficiency and reliability make them well-suited for these applications. Renewable Energy Systems: MOSFETs** play a crucial role in renewable energy systems, such as solar panels and wind turbines. They help regulate the flow of electricity by converting DC power to AC or vice versa, allowing for more efficient use of renewable energy sources.** Conclusion MOSFETs offer numerous advantages over traditional BJTs, making them an essential component in modern electronic devices and applications. With continued advancements in technology, MOSFETs will continue to play a vital role in increasing efficiency and reliability for various industries. As new developments in materials and design continue to emerge, MOSFETs will become even more versatile and play an even bigger role in powering the devices of tomorrow. So next time you power up your smartphone or use renewable energy, remember that MOSFETs are working hard behind the scenes to make it all possible! Additionally, researchers are constantly exploring new ways to improve MOSFET technology by experimenting with different materials, structures, and fabrication techniques. This ongoing research aims to further enhance the performance and efficiency of MOSFETs, making them an integral part of our future technological advancements. Moreover, as demand for low-power consumption continues to increase in various industries such as automotive, consumer electronics, and space exploration, MOSFETs will be crucial in meeting these energy-efficient requirements. This further highlights the significance of MOSFETs and their continued development in shaping our modern world. Future Possibilities: As technology advances and new applications emerge, there is no limit to what can be achieved with MOSFETs. With the potential for higher power densities, faster switching speeds, and improved reliability, MOSFETs have a promising future in various industries. From electric vehicles to smart grids, from medical devices to space missions, there are endless possibilities for using MOSFETs to improve efficiency and performance. As researchers continue to push the limits of what is possible with this technology, we can expect to see even more innovative uses of MOSFETs in the near future. Collaboration and Innovation: The development of MOSFET technology has been a collaborative effort between scientists, engineers, and manufacturers from around the world. This collaboration allows for the sharing of ideas, resources, and expertise leading to continuous innovation and improvement of MOSFETs. As we move towards a more interconnected global society, this collaborative approach will be crucial in driving advancements in MOSFET technology and its diverse applications. Impact on Society: The impact of MOSFETs goes beyond just technological advancement. These devices have also played a significant role in shaping our modern society. With their ability to improve energy efficiency and reduce power consumption, MOSFETs have contributed to reducing our carbon footprint and promoting sustainable living. Additionally, the use of MOSFETs in various electronic devices has made them more accessible and affordable for a wider demographic, enhancing connectivity and communication across the globe. Continued Development: Despite their success and widespread use, researchers are not slowing down in their efforts to improve MOSFET technology. As we continue to demand higher performance from our devices, the development of new materials, structures, and fabrication techniques will be crucial in meeting these demands. This continuous improvement ensures that MOSFETs remain at the forefront of technological innovation for years to come. View our MOSFETs.

SINGLE, HIGH FREQUENCY, N-CHANNEL JFET AMPLIFIER < Back 2N/PN/SST4416 Series SINGLE, HIGH FREQUENCY, N-CHANNEL JFET AMPLIFIER The 2N/PN/SST4416 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. 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: 2N4416 TO-72 4L RoHS 2N4416A TO-72 4L RoHS PN4416 TO-92 3L RoHS PN4416A TO-92 3L RoHS SST4416 SOT-23 3L RoHS SST4416A SOT-23 3L RoHS 2N4416 Die 2N4416A Die Datasheet Spice Model Application Notes

< Back What is a JFET? Linear Systems May 30, 2024 JFETs are three-terminal semiconductor devices that can be used as electronically controlled switches or resistors, or to build amplifiers. Linear Systems JFET (Junction Field-Effect Transistor) amplifiers are known for their exceptional performance in low-noise, high-input impedance applications. These amplifiers are particularly valued in audio, instrumentation, and signal processing systems due to their ability to amplify weak signals without adding significant noise. Dual JFET amplifiers incorporate two JFETs in a single package, which offers matched characteristics and improved thermal stability. This configuration enhances the performance and reliability of circuits that require closely matched transistors, simplifying the design and reducing component count. Such amplifiers find extensive use in differential amplifiers and other precision analog circuits, making them indispensable in high-fidelity audio equipment and sensitive measurement devices. JFET Basics JFETs are three-terminal semiconductor devices with a gate, source, and drain. They belong to the family of field-effect transistors (FETs), where the flow of current is controlled by an electric field applied to the device's gate terminal. In contrast to bipolar junction transistors (BJTs), which use a current-controlled base to control the collector-emitter current, JFETs utilize a voltage-controlled gate to regulate the source-drain current. This fundamental difference is what makes JFETs superior in high-impedance applications as they draw very little gate current, resulting in minimal loading and noise contributions. Common Source Amplifier The most widely used configuration for amplifying signals using a JFET is the common source (CS) amplifier. As the name suggests, the input signal is applied at the device's gate terminal and amplified output is obtained at its drain. The source terminal is common to both input and output circuits, hence the name. The CS amplifier offers high voltage gain, excellent linearity and good frequency response over a wide range. It also provides high input impedance and low output impedance, making it suitable for driving loads with varying impedances. Advantages of JFETs High Input Impedance: Because the gate is isolated from the source-drain path by a reverse-biased PN junction, JFETs have very high input impedance compared to BJTs or MOSFETs. This allows them to be used in high-impedance circuits without causing significant loading effects. Low Noise: Due to their low gate current and minimal internal resistance, JFETs exhibit very low noise performance, making them ideal for use in sensitive audio equipment and measurement devices. Good Linearity: The transconductance (gm) of a JFET is relatively constant over a wide range of input voltages, resulting in good linearity and low distortion compared to BJTs or MOSFETs. Simple Biasing: Unlike BJTs which require precise base biasing and MOSFETs which need complex circuitry for gate biasing, JFETs can be easily biased using a simple resistor or potentiometer. Reverse Bias Protection: The reverse-biased PN junction in the JFET acts as a natural diode, providing reverse bias protection and preventing damage to the device if the input voltage exceeds the specified limit. Applications of JFETs JFETs find applications in various electronic circuits such as: Low-Noise Amplifiers: Due to their low noise performance, JFETs are commonly used in audio amplifiers, radio receivers, and other sensitive applications where noise can be a major issue. Switching Circuits: JFETs can be used as simple on-off switches by connecting the gate to ground (for N-channel) or to the supply voltage (for P-channel) to control the flow of current between source and drain. Voltage-controlled Resistors : By varying the gate voltage, a JFET can be used as a variable resistor in circuits such as oscillators and filters. Sample-and-Hold Circuits: The high input impedance of JFETs makes them suitable for use in sample-and-hold circuits where the input voltage needs to be held constant for a short period of time. Constant Current Sources: JFETs can also be used as simple constant current sources, where the output current remains nearly constant despite changes in input voltage or load resistance. Other applications include use in high-frequency circuits, chopper amplifiers, and instrumentation equipment. With advancements in technology, JFETs are being increasingly replaced by other types of transistors such as MOSFETs. However, they still hold importance in certain specialized applications due to their unique characteristics and simplicity in biasing and operation. Conclusion JFETs are versatile electronic devices with numerous advantages over other types of transistors. These include high input impedance, low noise performance, and simplicity in biasing. They find widespread use in various applications such as amplifiers, switching circuits, voltage-controlled resistors, sample-and-hold circuits, and constant current sources. Despite being gradually replaced by other transistor types, JFETs still hold importance in certain specialized applications and continue to be an essential component in the field of electronics. With ongoing research and development, we can expect to see further advancements and improvements in JFET technology. These small but powerful devices will continue to play a significant role in shaping the electronic industry. So, it is important for any electronics enthusiast or professional to have a thorough understanding of the working principles and applications of JFETs in order to utilize them effectively in their circuit designs. With their versatile characteristics and unique advantages, JFETs have undoubtedly played a crucial role in the development of modern electronic systems and will continue to do so in the future. So next time you come across a JFET, remember their importance and versatility in the world of electronics.

LOW NOISE, LOW CAPACITANCE SINGLE P-CHANNEL JFET < Back LSJ289 LOW NOISE, LOW CAPACITANCE SINGLE P-CHANNEL JFET The LSJ289 is a Low Noise, Low Capacitance, Single P-Channel JFET. Available in the TO-92 3L 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: LSJ289 TO-92 3L RoHS LSJ289 SOT-23 3L RoHS LSJ289 Die Datasheet Spice Model Application Notes