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CURRENT REGULATING DIODE < Back SST500 Series CURRENT REGULATING DIODE The SST500 Series Current Regulating Diode is a direct replacement for the Siliconix-Vishay SST500 Series. It is ideal for current-limiting and constant-current applications. It is available in the 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: SST500 SOT23 3L RoHS SST501 SOT23 3L RoHS SST502 SOT23 3L RoHS SST503 SOT23 3L RoHS SST504 SOT23 3L RoHS SST505 SOT23 3L RoHS SST506 SOT23 3L RoHS SST507 SOT23 3L RoHS SST508 SOT23 3L RoHS SST509 SOT23 3L RoHS SST510 SOT23 3L RoHS SST511 SOT23 3L RoHS J500 Die J501 Die J502 Die J503 Die J504 Die J505 Die J506 Die J507 Die J508 Die J509 Die J510 Die J511 Die Datasheet Spice Model Application Notes

LOG CONFORMANCE, MONOLITHIC DUAL, PNP TRANSISTOR < Back LS358 LOG CONFORMANCE, MONOLITHIC DUAL, PNP TRANSISTOR The LS358 Log Conformance, Monolithic Dual, PNP Transistor is a direct replacement for Micro Power Systems MP358 Series. It is ideal for Log Conformance, Transistor Amplifier & Switching Applications. It is available the in TO-71 6L RoHS, TO-78 6L RoHS, PDIP 8L ROHS 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: LS358 TO-71 6L RoHS LS358 TO-78 6L RoHS LS358 PDIP 8L RoHS LS358 SOIC 8L RoHS LS358 Die Datasheet Spice Model Application Notes

< 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

< 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)

< 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.

SINGLE P-CHANNEL JFET SWITCH < Back J/SST174 Series SINGLE P-CHANNEL JFET SWITCH The J/SST174 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 Jagdev Bariana: Chief Product Officer Linear Systems Mar 31, 2025 Linear Systems Promotes Jagdev Bariana to Chief Product Officer Linear Systems Promotes Jagdev Bariana to Chief Product Officer Fremont, California – April 1, 2025 – Linear Integrated Systems, Inc. , a leading designer and manufacturer of high-performance, small-signal discrete semiconductors, is proud to announce the promotion of Jagdev Bariana to Chief Product Officer (CPO). In this elevated role, Bariana will continue to oversee all product-related activities, ensuring efficient production processes, maintaining high product quality, and aligning product strategies with customer needs and market demand. Bariana's tenure at Linear Systems has been marked by significant contributions to product management and development. His expertise in data analysis, testing, quality assurance, and new product development has been instrumental in advancing the company's product offerings. His leadership in managing and training teams has fostered a culture of excellence and continuous improvement. Bariana's commitment to customer support and collaboration with engineering and marketing teams has ensured that Linear Systems consistently meets and exceeds market demands. Prior to joining Linear Systems, Bariana amassed 15 years of experience as a Product Engineer at Supertex, where he honed his skills in product development and engineering. In his new role as CPO, Bariana will leverage his extensive experience to drive product innovation and operational excellence, ensuring that Linear Systems continues to deliver high-quality products that meet the evolving needs of its customers. About Linear Systems: 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: Jaime Cook VP of Operations & Market Development Linear Integrated Systems, Inc. jaimecook@linearsystems.com Let's connect on LinkedIn! www.linearsystems.com

SINGLE, LOW NOISE, HIGH GAIN, N-CHANNEL JFET AMPLIFIER < Back J/SST201 Series SINGLE, LOW NOISE, HIGH GAIN, N-CHANNEL JFET AMPLIFIER The J/SST201 Series Single, Low Noise, High Gain, N-Channel JFET Amplifier is a direct replacement for the Fairchild, NXP, and Siliconix-Vishay equivalent part. It is ideal for High Gain, Low Noise Applications. Available in the 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: J201 TO-92 3L RoHS J202 TO-92 3L RoHS J204 TO-92 3L RoHS SST201 SOT-23 3L RoHS SST202 SOT-23 3L RoHS SST204 SOT-23 3L RoHS J201 Die J202 Die J204 Die Datasheet Spice Model Application Notes

< Back Headphone Amp Eval Board Introduction Linear Integrated Systems headphone amplifier evaluation board includes the following features: Stereo, single‐ended input and single‐ended output 400 mW output power into 100Ω Wide frequency response (10Hz‐200kHz; ‐1dB) Voltage gain 5 (14dB) Low distortion (THD+N is less than 1% at 10Hz‐20kHz at 5Vrms into 100Ω and less than 0.1% from 10 Hz to 20 kHz at 1Vrms into 100Ω load) Short‐circuit protection Pop reduction (slow start) circuit Defeatable cross‐feed circuit Volume control Overvoltage and reverse polarity power protection Audio input and output connections: left and right RCA phono jack inputs, ¼” stereo phone jack output External 9V–16V supply input External power supply connector: power jack, inside diameter 2.1mm, outside diameter 5.5mm Read More

SINGLE, LOW-NOISE, LOW-LEAKAGE, N-CHANNEL JFET AMPLIFIERS < Back LSK189 SINGLE, LOW-NOISE, LOW-LEAKAGE, N-CHANNEL JFET AMPLIFIERS The LSK189 Single, Low Noise, Low Leakage, N-Channel JFET Amplifiers is a single version of LSK489 Series. It is ideal for Ultra Low Noise Audio/Acoustic Applications. Available in TO-92 3L ROoHS, 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: LSK189 TO-92 3L RoHS LSK189 SOT-23 3L RoHS LSK189 Die Datasheet Spice Model Application Notes

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

Linear Systems designs and manufactures the highest-performance line of monolithic dual JFETs in the industry. Contact us for a quote! Back LSK389 Series LOW NOISE, MONOLITHIC DUAL, N-CHANNEL JFET T he LSK389A, B, C and D grades of high performance monolithic dual JFETs feature extremely low noise, tight offset voltage and low drift over temperature specifications, and is targeted for use in a wide range of precision instrumentation applications. This series has a wide selection of offset and drift specifications. This high-performance, ultra-low-noise dual N-Channel JFET amplifier is the only 100-percent noise tested JFET available and provides the optimal balance between very low noise (en =1.3nV/√Hz) and input capacitance (Ciss = 25pF). Available in TO-71 6L, SOIC 8L, as well as die form. Advanced screening options are available for our diverse product lineup, featuring JFETS, Bipolar transistors, Mosfet, current regulators, and Diodes. Our special screening covers all the parameters listed in the standard data sheet, 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: LSK389A TO-71 6L RoHS LSK389B TO-71 6L RoHS LSK389C TO-71 6L RoHS LSK389D TO-71 6L RoHS LSK389A SOIC 8L RoHS LSK389B SOIC 8L RoHS LSK389C SOIC 8L RoHS LSK389D SOIC 8L RoHS LSK389A Die LSK389B Die LSK389C Die LSK389D Die Datasheet Spice Model Application Notes