P-CHANNEL JFET, VOLTAGE CONTROLLED RESISTOR < Back LS26VPS_ P-CHANNEL JFET, VOLTAGE CONTROLLED RESISTOR The LS26VPS is a P-Channel Single JFET voltage-controlled resistor. It has a drain-source resistance that is controlled by a DC bias voltage (VGS) applied to a high impedance gate terminal. Minimum RDS of 20 Ω occurs when VGS = 3.0V. As VGS approaches the pinch-off voltage of 7.5V, RDS rapidly increases to the maximum value or RDS = 50 Ω. For the N-Channel version, please see our LS26VNS. Both the N and P-channel parts are made from the same die geometry, making them complimentary. This part is available in the TO-92 3L RoHS, SOT-23 3L RoHS and DFN 8L 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: LS26VPS TO-92 3L RoHS LS26VPS SOT-23 3L RoHS LS26VPS DFN 8L RoHS Datasheet Spice Model Application Notes

N-CHANNEL JFET, VOLTAGE CONTROLLED RESISTOR < Back LS26VNS N-CHANNEL JFET, VOLTAGE CONTROLLED RESISTOR The LS26VNS N-Channel Single JFET voltage controlled resistor has a drain-source resistance that is controlled by a DC bias voltage (VGS) applied to a high impedance gate terminal. Minimum RDS of 14 Ω occurs when VGS = -1.0V. As VGS approaches the pinch-off voltage of -6.0V RDS rapidly increases to the maximum value or RDS = 38 Ω. For the P-Channel version, please see our LS26VPS. Both the N and P-channel parts are made from the same die geometry, making them complimentary. This part is available in the TO-92 3L RoHS, SOT-23 3L RoHS and DFN 8L 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: LS26VNS TO-92 3L RoHS LS26VNS SOT-23 3L RoHS LS26VNS DFN 8L RoHS Datasheet Spice Model Application Notes

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

< Back LSK389 App Note Introduction The LSK389 is the industry’s lowest noise Dual N-Channel JFET, 100% tested, guaranteed to meet 1/f and broadband noise specifications, while eliminating burst (RTN or popcorn) noise entirely. The product displays high transconductance and very good matching. It is the JFET of choice for low noise applications, especially those requiring a differential amplifier input stage. Read More

Linear Systems designs and manufactures the highest-performance line of monolithic dual JFETs in the industry. Contact us for a quote! Back 2N/LS3954 Series LOW NOISE, LOW DRIFT, MONOLITHIC DUAL, N-CHANNEL JFET The 2N/LS3954 Series Low Noise, Low Drift, Monolithic Dual, N-Channel JFETs are ideal for amplifier applications. The series is a pin-for-pin replacement for National & Siliconix-Vishay 2N3954 Series. These devices are available in TO-71 6L, PDIP 8L and SOIC 8L RoHS package types, 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: LS3954A TO-71 6L RoHS LS3954 TO-71 6L RoHS LS3955 TO-71 6L RoHS LS3956 TO-71 6L RoHS LS3958 TO-71 6L RoHS LS3954A PDIP 8L RoHS LS3954 PDIP 8L RoHS LS3955 PDIP 8L RoHS LS3956 PDIP 8L RoHS LS3958 PDIP 8L RoHS LS3954A SOIC 8L RoHS LS3954 SOIC 8L RoHS LS3955 SOIC 8L RoHS LS3956 SOIC 8L RoHS LS3958 SOIC 8L RoHS LS3954A Die LS3954 Die LS3955 Die LS3956 Die LS3958 Die Datasheet Spice Model Application Notes

< Back LSK170 Press Release Linear Systems Mar 17, 2023 Direct Replacement for Toshiba 2SK170 LINEAR INTEGRATED SYSTEMS NEW ULTRA LOW NOISE JFETs TARGET AUDIO, INSTRUMENTATION, MEDICAL AND SENSORS LSK170 SERIES DELIVERS DIRECT PIN FOR PIN REPLACEMENT OF TOSHIBA'S 2SK170 FREMONT, Calif. January 25, 2005 Linear Integrated Systems, a leading full-service manufacturer of specialty linear semiconductors, announces the immediate availability of its LSK170 series of JFETs, optimized to provide low noise at both high and low frequency with a narrow range of IDSS and low capacitance. The LSK170's low noise to capacitance ratio and narrow range of low value IDSS provide solutions for low noise applications which cannot tolerate high values of capacitance or wide ranges of IDSS. The LSK170 offers a voltage noise (en) of 1nv/hz @ 1khz, 2nv/hz @ 10hz typical and a High Gain (yfs, 22ms), with only 22pf of capacitance (Ciss). This series has three grades of IDSS range: 2.6-6mA, 6.0-12mA, and 10-20mA. The narrow ranges of IDSS binning with the LSK170 promote ease of design tolerancing, particularly in low voltage applications. The LSK170 is ideal for portable battery operated applications, and features high BVDSS for maximum linear headroom in high transient program content amplifiers. The series has a uniquely linear VGS transfer function for a stability that is highly desirable, particularly for audio front-end preamplifiers. The device is available in surface mount SOT-23 and thru-hole TO-92 packages. The surface mount version of the LSK170 series creates new opportunities for engineers seeking to design lower noise circuits in compact embeddable applications where shielding and space is critical and are not supported with the traditional TO-92 package. The LSK170 series is a pin for pin replacement of the Toshiba 2SK170 and improved functional replacement for the Interfet IF1320, IF1330, IF1331, and IF4500. Superior Performance, Domestic Source The LSK170 is specifically designed for low noise, high input impedance applications within the audio, instrumentation, medical and sensors markets. Our new LSK170 series feature a unique low noise profile having nearly zero popcorn noise," says Dr. John Hall, Linear Integrated Systems founder and president. "Utilizing large scale integrated circuit technology to build the LSK170 series allows LIS to achieve the goals of high transconductance, low noise and a low value of gate to drain capacitance. This combined with recent developments in Ion Implant technology optimized for low noise has allowed the creation of this state-of-the-art product." Linear Integrated Systems domestic in-factory stock guarantees short lead times, ensuring no disruption in production schedules. Summary of Features: Low Noise (en <1 nv/hz @ 1khz, 2 nv/hz @ 10hz typ) Low Capacitance (20pf typ) High Input Impedance Availability in narrow IDSS grades/ranges (2.6-6mA, 6.0=12mA and 10-20mA) High Gain (Yfs = 22mS typ) High Breakdown Voltage (BVGSS = 40V Min) Improved pin for pin replacement for Toshiba 2SK170 Surface mount SOT23 version (not offered by Toshiba 2SK170) Improved functional replacement for Interfet IF1320, IF1330, IF1331, and IF4500 Applications: Audio amplifiers and preamps, discrete low-noise operational amplifiers, battery-operated audio preamps, guitar pickups, effects pedals, microphones, audio mixer consoles, acoustic sensors, sonobouys, hydrophones, chemical and radiation detectors, instrumentation amplifiers, accelerometers, CT scanners input stages, oscilloscope input stages, electrometers and vibrations detectors. Price: LSK170A TO-92 3L = $4.46 (1,000+ pieces), LSK170A SOT-23 3L = $4.62 (1,000+ pieces) Availability: Sampling now in SOT-23 and TO-92 package options Delivery: Factory Stock About Linear Integrated Systems Linear Integrated Systems, Inc. is a U.S.-based, full service manufacturer of specialty linear products founded in 1987 with headquarters in Fremont, California. The company's small-signal discrete product lines are specifically designed to service the new design and second-source requirements of customers in the audio, hybrid, medical, space, test and measurement markets. Linear Integrated Systems supplies pin for pin replacements for more than 2,000 discrete devices currently offered or discontinued by Interfet, Intersil, Micro Power Systems, Motorola, National, Fairchild, Toshiba, and Siliconix-Vishay. Linear Integrated Systems has more than 35 years of design and process expertise in JFET and transistor manufacturing. The company’s founder, Dr. John Hall, has an established track record of leadership within various segments of the semiconductor industry, including the founding of Intersil and Micro Power Systems, development of the first 1 Volt CMOS digital watch and numerous related semiconductor patents. Engineers are invited to contact Linear Integrated Systems for assistance with application or special testing issues. Phone 510-490-9160 Fax: 510-353-0261 Email: sales@linearsystems.com Website: www.linearsystems.com

< Back DMOS High Speed Switches by Linear Systems Linear Systems Jun 17, 2024 The Linear Systems family of DMOS devices is designed to handle a wide range of video, fast ATE, telecom and other analog switching applications. These components are capable of ultrafast switching speeds (tr = 1 ns, tOFF = 3 ns) and excellent transient response. Thanks to reduced parasitic capacitances, our DMOS can handle wideband signals with high off-isolation and minimum crosstalk. Linear Systems is a leading manufacturer of DMOS high speed switches , providing innovative solutions for a wide range of applications. Our advanced DMOS technology allows for faster switching times, lower power consumption and improved reliability. In this article, we will explore the features and benefits of our DMOS high speed switches in more detail. Introduction to DMOS High Speed Switches DMOS (Double-Diffused Metal-Oxide-Semiconductor) technology is a type of power MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) commonly used in high speed switching applications. It offers several advantages over traditional bipolar junction transistors, such as higher breakdown voltage, faster switching times and lower on-resistance. This makes DMOS high speed switches ideal for use in a variety of industries, including telecommunications, automotive and aerospace. Features of DMOS High Speed Switches DMOS high speed switches offer several key features that make them stand out from other types of power MOSFETs. These include: Higher breakdown voltage: DMOS technology allows for higher breakdown voltage compared to other MOSFETs. This means that DMOS high speed switches can handle higher voltages without being damaged, making them suitable for use in high power applications. Faster switching times: Due to the low capacitance and on-resistance of DMOS high speed switches, they are able to switch on and off much faster than traditional bipolar junction transistors. This results in improved overall system performance and efficiency. Lower power consumption: DMOS technology offers lower on-resistance, which translates to less power being wasted as heat. This makes DMOS high speed switches a more energy-efficient option for systems that require frequent switching. Benefits of Using DMOS High Speed Switches The use of DMOS high speed switches can bring a number of benefits to various applications, including: Improved performance: With their faster switching times and lower on-resistance, DMOS high speed switches can help improve the overall performance and efficiency of electronic systems. Higher power handling capabilities: The higher breakdown voltage of DMOS technology allows for higher power handling capabilities, making DMOS high speed switches suitable for use in high power applications such as motor control and power supplies. Cost-effectiveness: Due to their lower power consumption and improved performance, the use of DMOS high speed switches can result in cost savings over time. Compact size: The low on-resistance of DMOS high speed switches allows for them to be made in smaller sizes, making them ideal for use in compact electronic devices and systems. Reliability: DMOS technology has been extensively researched and developed, resulting in highly reliable high speed switches that can operate efficiently over a wide range of temperatures and voltages. Overall, the use of DMOS high speed switches offers a number of advantages over other types of switches, making them a popular choice for various applications in industries such as automotive, aerospace, and consumer electronics. With ongoing advancements in DMOS technology, these high speed switches are expected to continue improving and becoming more versatile for use in a wide range of electronic systems. So, it is clear that DMOS high speed switches play an important role in the advancement of modern technology and will continue to do so in the future. DMOS high speed switches are also compatible with various control methods, such as pulse width modulation (PWM) and pulse frequency modulation (PFM), making them suitable for use in a variety of electronic systems that require precise control over switching frequency and duty cycle. They can also be easily integrated into existing electronic circuits, making them a versatile choice for design engineers. Moreover, DMOS high speed switches offer low switching losses and fast response times, which helps reduce electromagnetic interference (EMI) in electronic systems. This is especially beneficial for applications that require high levels of efficiency and minimal noise, such as power converters and motor controllers. In addition to these advantages, DMOS high speed switches also have a high current handling capability, making them ideal for high power applications. This is due to their low on-resistance and efficient heat dissipation properties, allowing them to handle large currents without overheating. Furthermore, DMOS high speed switches are designed with built-in protection features such as overcurrent protection (OCP) and thermal shutdown (TSD), ensuring safe and reliable operation even under harsh conditions. Overall, the continued advancements in DMOS technology have led to the development of high speed switches that offer a wide range of benefits for various electronic systems. With their versatility, efficiency, and reliability, these switches are expected to play a crucial role in driving the progress of modern technology. From consumer electronics to industrial applications, DMOS high speed switches are paving the way for more efficient, compact, and reliable electronic systems. As technology continues to evolve, it's likely that DMOS high speed switches will continue to be a key component in driving innovation and progress in the electronic industry. So whether you're designing a power converter for renewable energy sources or a motor controller for electric vehicles, consider using DMOS high speed switches to take advantage of their numerous benefits and contribute to the advancement of technology. With these high speed switches, the possibilities for electronic applications are endless. The future is bright for DMOS technology and we can expect even more exciting developments in the years to come. In conclusion, DMOS high speed switches have revolutionized the field of power electronics by offering a unique combination of speed, efficiency, and reliability. Through continuous advancements in technology, these switches have become an integral part of modern electronic systems and are expected to play a crucial role in the future of technology. So whether you're an engineer working on cutting-edge technologies or a consumer benefiting from the convenience of electronic devices, DMOS high speed switches have helped make it all possible. As we continue to push the boundaries of what is possible, DMOS technology will undoubtedly continue to play a pivotal role in driving innovation and progress. So let's embrace the potential of DMOS high speed switches and see where they take us next in our technological journey. The possibilities are limitless! So why wait? Start incorporating DMOS high speed switches into your designs today and be a part of the exciting future of technology. Happy switching! #DMOS #highspeedswitches #technology #innovation Why DMOS High Speed Switches Are Crucial for Driving Innovation in the Electronic Industry The electronic industry is constantly evolving and pushing the boundaries of what is possible, and a key component in this progress has been the development of DMOS high speed switches. These switches have become essential in various electronic applications, from power supplies and motor drives to telecommunications and consumer electronics. But what sets DMOS high speed switches apart from other switch technologies? Let's take a closer look at why these switches are crucial for driving innovation in the electronic industry. Speed One of the most significant advantages of DMOS high speed switches is their speed. These switches are capable of switching on and off at incredibly high speeds, making them ideal for use in applications that require rapid switching. This speed is essential for efficient operation and precise control in electronic devices. Efficiency Efficiency is another critical factor in the electronic industry, and DMOS high speed switches excel in this aspect as well. These switches have a low on-resistance, meaning they can handle high currents without significant power losses. This efficiency not only helps to reduce energy consumption but also allows for the design of smaller and more compact electronic devices. Reliability Reliability is crucial in any electronic device, and DMOS high speed switches have proven to be highly reliable over the years. These switches are designed to withstand harsh environments and high operating temperatures, making them suitable for use in a wide range of applications. This reliability ensures that electronic devices equipped with DMOS high speed switches can perform consistently and without failure. Versatility One of the most significant advantages of DMOS high speed switches is their versatility. These switches can be used in a variety of electronic applications, from low voltage to high voltage applications. They are also suitable for both AC and DC circuits, making them a popular choice among electronic design engineers. Innovation The constant need for innovation in the electronic industry drives the development of new technologies, and DMOS high speed switches play a crucial role in this process. These switches provide designers with more options and flexibility when it comes to creating innovative electronic devices. With their high-speed performance and efficiency, DMOS switches enable the development of cutting-edge products such as smartphones, laptops, and electric vehicles. Sustainable Development In recent years, there has been an increasing focus on sustainable development in the electronic industry. DMOS high speed switches contribute to this cause by being energy-efficient and environmentally friendly. With reduced power consumption and fewer emissions, these switches help to minimize the overall environmental impact of electronic devices. This makes them a vital component in the development of more sustainable and eco-friendly technology. Conclusion In conclusion, DMOS high speed switches are a crucial component in modern electronic devices. With their reliability, versatility, innovative capabilities, and contribution to sustainable development, these switches play a significant role in driving the advancement of the electronic industry. As technology continues to evolve, it is certain that DMOS high speed switches will continue to play a crucial role in shaping the future of electronic devices. So, it is important for electronic design engineers to stay updated with the latest developments and advancements in DMOS high speed switch technology to unlock its full potential in their designs. With this powerful tool at their disposal, designers can push the boundaries of what is possible in the electronic world and create truly groundbreaking products. So, let's embrace DMOS high speed switches and continue to innovate and improve the way we interact with technology. The possibilities are endless! So go ahead and explore all that DMOS has to offer for your next electronic design project.

< Back Designing Audio Circuits and Systems Linear Systems Jul 25, 2024 Exploring Phono Preamp Circuits with Bob Cordell’s New Book At Linear Systems, we are always on the lookout for innovative and educational resources to share with our community of designers and engineers. This Friday, we are thrilled to spotlight a phono preamp circuit from our friend Bob Cordell’s excellent new book, “Designing Audio Circuits and Systems.” Bob Cordell is a respected authority in the field of audio electronics, and his latest book is a treasure trove of knowledge for anyone interested in audio circuit design. The book is packed with detailed explanations, practical insights, and a wide range of circuits that cater to both beginners and seasoned designers. One of the standout chapters for us is Chapter 15, which delves into the design of moving magnet phono preamps. Phono preamps are essential for amplifying the signal from a turntable to a level that can be processed by a standard audio system. The moving magnet preamp circuit featured in Chapter 15 is not only a fantastic educational tool but also a highly practical design for anyone looking to enhance their vinyl listening experience. To bring this design to life, we captured the schematic in QSPICE, our go-to tool for electronic circuit simulation. QSPICE allows us to create accurate simulations, enabling designers to tweak and optimize their circuits with ease. With just a few clicks, you can dive into simulations and start experimenting with the design parameters to see how they affect the performance of the preamp. Whether you are an audio enthusiast, a professional designer, or someone with a keen interest in electronics, Bob Cordell’s book and this phono preamp circuit offer a wealth of knowledge and a fun project to work on. We highly recommend adding “Designing Audio Circuits and Systems” to your library and exploring the many circuits it has to offer. Stay tuned for more exciting designs and insights from Linear Systems. Happy designing!

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

HIGH VOLTAGE, SUPER BETA, MONOLITHIC DUAL, NPN TRANSISTOR < Back LS301 Series HIGH VOLTAGE, SUPER BETA, MONOLITHIC DUAL, NPN TRANSISTOR Previous Next

< Back Solving the Noise Puzzle Introduction Noise is one of the more important aspects of circuit design. Lower noise in audio amplifier design means better quality audio. Low-noise in instrument design means more reliable and accurate measurements at lower voltage and current levels. And low-noise in current source designs means less noise injected into the electronic system. One of the most basic approaches to reduce noise in an amplifier is to use low-noise components. This would include low-noise bipolar transistors and low-valued resistors. Although one can use low-noise operational amplifiers in the design of low-noise circuits or low-noise current sources it is often not done. This is because lower noise can be often be obtained with a well-thought out discrete design. And that’s because discrete transistors offer much more design customization capability for specific circuit applications – like optimized collector biasing. One must remember that monolithic chip designs are built for the most part for general purpose applications. It is hard to tailor a specific op amp or current source chip for a specific source resistance, specific power consumption requirement and a specific bandwidth that will lower the overall noise – that is unless you add-on more compensation components. Read More

Linear Systems designs and manufactures the highest-performance line of monolithic dual JFETs in the industry. Contact us for a quote! Back LS840 Series LOW-NOISE, LOW-DRIFT, LOW CAPACITANCE, MONOLITHIC DUAL N-CHANNEL JFET AMPLIFIER The LS840 Series Low-Noise, Low-Drift, Low-Capacitance, 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: LS840 TO-71 6L RoHS LS841 TO-71 6L RoHS LS842 TO-71 6L RoHS LS840 TO-78 6L RoHS LS841 TO-78 6L RoHS LS842 TO-78 6L RoHS LS840 PDIP 8L RoHS LS841 PDIP 8L RoHS LS842 PDIP 8L RoHS LS840 SOIC 8L RoHS LS841 SOIC 8L RoHS LS842 SOIC 8L RoHS LS840 Die LS841 Die LS842 Die Datasheet Spice Model Application Notes