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< 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 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

HIGH INPUT IMPENDANCE, SINGLE, BIFET AMPLIFIER < Back LS320 HIGH INPUT IMPENDANCE, SINGLE, BIFET AMPLIFIER The LS320 Single, high Input Impedance, BIFET Amplifier is a direct replacement for Amperex equivalent part. It is ideal for High Impedance Sensor Amplifier Applications. Available in the TO-72 4L RoHS, TO-92 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: LS320 TO-72 4L RoHS LS20 TO-92 3L RoHS LS320 SOT-23 3L RoHS LS320 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 - DFN < Back 4117DFN SERIES SINGLE, LOW CAPACITANCE, ULTRA-HIGH INPUT IMPEDANCE N-CHANNEL JFET AMPLIFIER - DFN 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. This series is available in the DFN 8L RoHS miniature/non/magnetic package, as well as the TO-72 4L RoHS, TO-92 3L RoHS, SOT-23 3L RoHS package and 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: 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

< 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 P-CHANNEL JFET SWITCH < Back 174DFN Series DFN PACKAGE, SINGLE P-CHANNEL JFET SWITCH The 174DFN Series Low On-Resistance, P-Channel JFET Switch is a direct replacement for the Fairchild and Siliconix-Vishay part series. It is ideal for low resistance, low operating current switching applications. Available in the DFN 8L RoHS, TO-92 3L RoHS and SOT-23 3L RoHS package, as well as in die form. Advanced screening options are available for our diverse product lineup, featuring JFETS, Bipolar transistors, MOSFETs, current regulators, and Diodes. Our special screening covers all the parameters listed in the standard datasheet, including comprehensive package pin-out. Connect with our experienced technical team to discuss your specific needs and tailor your requirements—email us at support@linearsystems.com or call (510) 490-9160. MOQ applies to these specialized services. Ordering Information Below are the options you have when ordering this part series: 174DFN 8L RoHS 175DFN 8L RoHS 176DFN 8L RoHS 177DFN 8L RoHS J174 TO-92 3L RoHS J175 TO-92 3L RoHS J176 TO-92 3L RoHS J177 TO-92 3L RoHS SST174 SOT-23 3L RoHS SST175 SOT-23 3L RoHS SST176 SOT-23 3L RoHS SST177 SOT-23 3L RoHS J174 Die J175 Die J176 Die J177 Die Datasheet Spice Model Application Notes

Linear Systems designs and manufactures the highest-performance line of monolithic dual JFETs in the industry. Contact us for a quote! Back LS830 Series ULTRA-LOW LEAKAGE, LOW DRIFT, MONOLITHIC DUAL N-CHANNEL JFET The LS830 Series of Ultra-Low Leakage, Low Drift, Monolithic Dual N-Channel JFETs 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: LS830 TO-71 6L RoHS LS831 TO-71 6L RoHS LS832 TO-71 6L RoHS LS833 TO-71 6L RoHS LS830 TO-78 6L RoHS LS831 TO-78 6L RoHS LS832 TO-78 6L RoHS LS833 TO-78 6L RoHS LS830 PDIP 8L RoHS LS831 PDIP 8L RoHS LS832 PDIP 8L RoHS LS833 PDIP 8L RoHS LS830 SOIC 8L RoHS LS831 SOIC 8L RoHS LS832 SOIC 8L RoHS LS833 SOIC 8L RoHS LS831 Die LS832 Die LS833 Die Datasheet Spice Model Application Notes

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

SINGLE, N-CHANNEL ENHANCEMENT MODE MOSFET < Back 2N4351 Series SINGLE, N-CHANNEL ENHANCEMENT MODE MOSFET The 2N4351 Series Single, N-Channel Enhancement Mode MOSFET is a direct replacement for Intersil and Siliconix-Vishay part. It is ideal for Amplifier and Switching Applications. The part series is available in the TO-72 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 series: 2N4351 TO-72 4L RoHS 2N4352 TO-72 4L RoHS 2N4351 Die 2N4352 Die Datasheet Spice Model Application Notes

TIGHTLY MATCHED, MONOLITHIC DUAL, NPN TRANSISTOR < Back LS3250 Series - Dual TIGHTLY MATCHED, MONOLITHIC DUAL, NPN TRANSISTOR Previous Next

LOG CONFORMANCE, MONOLITHIC DUAL, NPN TRANSISTOR < Back LS318 LOG CONFORMANCE, MONOLITHIC DUAL, NPN TRANSISTOR Previous Next