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< Back App Note by Dimitri Danyuk ​ Mar 17, 2023 Headphone Amplifier Evaluation Board Linear Integrated Systems headphone amplifier evaluation board is a complete, low-power stereo audio amplifier for high-fidelity line-level output and headphone applications. It consists of Linear Integrated Systems JFETs along with a number of other parts mounted on a circuit board. 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

< 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

Back 2N/LS5905 Series LOW-LEAKAGE, LOW-DRIFT, MONOLITHIC DUAL, N-CHANNEL JFET AMPLIFIER The 2N/LS5905 Series Low Leakage, Low Drift, Monolithic Dual N-Channel JFET Amplifier features tight matching and low drift over temperature specifications. The series is targeted for use in a wide range of precision instrumentation applications where tight tracking is required. Linear Systems’ version of this part series is a direct, pin-for-pin replacement of the Intersil part. Available in the TO-78 7L 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: LS5905 TO-78 7L RoHS LS5906 TO-78 7L RoHS LS5907 TO-78 7L RoHS LS5908 TO-78 7L RoHS LS5909 TO-78 7L RoHS 2N5905 TO-78 7L RoHS 2N5906 TO-78 7L RoHS 2N5907 TO-78 7L RoHS 2N5908 TO-78 7L RoHS 2N5909 TO-78 7L RoHS LS5905 SOIC 8L RoHS LS5906 SOIC 8L RoHS LS5907 SOIC 8L RoHS LS5908 SOIC 8L RoHS LS5909 SOIC 8L RoHS Datasheet Spice Model Application Notes

< Back 3N163 App Note Introduction Wireless real-time radiation sensors networks offer the general public and those that work in high radiation areas greater protection against radiation hazards. Combined with real-time localized and global heat mapping of radiation levels, these radiation networks will help give government and environmental agencies the ability to understand the radiation landscape and respond quickly to radiation changes before they become life-threatening. Low-cost, low-power and no-power radiation sensors, also known as RADFETs (radiation field effect transistors) or dosimeters, are necessary for the implementation of these networks. The RADFET is unique because it does not need a power source to detect radiation. It is also unique in that it records the amount of actual radiation exposure and, as a non-volatile analog memory device, stores the level of radiation exposure as a change in threshold voltage. RADFETs are relatively simple circuits, consisting of only a PMOS transistor. The LS 3N163 PMOS (P-Channel) MOSFET transistor can be used to design RADFETs to meet different design requirements like cost, sensitivity, linearity, and power. The ability to optimize a RADFET for these different design requirements give network designers the ability to construct wireless radiation sensor networks that can also be optimized for cost and performance on a wide scale. Radiation detector principles PMOS MOSFET radiation detectors work on the principle that electron-hole pairs form when radiation or an ionizing particle strikes the MOSFET. This in turn results in shifts to the threshold voltage and drain current parameters of the MOSFET device. Because the change in threshold voltage with radiation exposure is highly linear in a PMOS device, PMOS devices such as the LS 3N163 are commonly used as a radiation detector. In a typical application, the LS 3N163 is operated in unbiased mode (no-power mode) and exposed to radiation. The change in threshold voltage is then measured and the corresponding radiation exposure level determined. In another application, where higher levels of sensitivity are needed, the LS 3N163 is operated in biased mode (power mode). Read More

Our Products Linear Systems is committed to providing a variety of quality merchandise for customers. By using the latest technologies and applying strict quality control procedures, we’ve become known for having the best products in the industry. Take a look at our products and get in touch to order or learn more. JFET Amplifiers Duals JFET Amplifiers Singles JFET Switches DMOS High Speed Switches Low Leakage Diodes Current Regulating Diodes Bipolar Transistors MOSFETs Voltage Controlled Resistors BIFET Amplifier Sample Boxes

World-Class Products Start With World-Class Parts Products Linear Systems has designed, manufactured and distributed the best semiconductors in their respective classes since 1987. Working in three Silicon Valley fabrication facilities, our components are world leaders in applications ranging from military underwater listening to the largest space telescope camera in existence. Grammy-winning musicians rely on microphones using our components, and some of the best audio gear in existence rely on our parts to hear this music. Systems ranging from airliners to spacecrafts base their sensors on our semiconductors. Our staff is committed to producing the best parts and ensuring the right ones arrive on time, every time. Speed & Security Flexibility & Scalability Precision With the Right Chip, Great Things Can Happen Products Linear Systems’ components are usually at the very front end of a system, a critical position in any circuit. Our ultra-low-noise amplification and high common-mode rejection ration (in our dual components) enable designers to create the lowest-noise signal chains possible. In applications ranging from military underwater listening to recording studio microphones, our semiconductors provide the best possible design solution. JFET Amplifiers Our Leading Products Our leading products are the LSK series of ultra-low-noise N-Channel monolithic dual and single JFETs such as the LSK389 and the LSK170 that are designed into the world’s most demanding applications. Our LS series of low-noise N-Channel monolithic dual and single JFETs provide extraordinary performance at consumer-market prices. We also produce a large line of high-performance standard JFET products sold under the Improved Standard Products. ​ Our line of high-speed lateral DMOS switches are the best-performing devices of their type. These include single and quad nanosecond switches, with and without protection diodes. ​ The Linear Systems PAD/JPAD/SSTPAD series of extremely low-leakage diodes provides a superior alternative to other diodes when reverse current must be minimized and design engineers are seeking protect circuit input sections from over-current and over-voltage conditions. We feature leakage currents ranging from -1 pA (PAD1) to -100 pA (SSTPAD100) to support a wide range of applications. Op-amps, ADC analog inputs, analog multiplexers, and [RS485] line receivers represent classes of devices that need protection. ​ The SST500 series of is a family of current-regulating diodes designed for demanding applications in test equipment, medical devices and instrumentation. These devices use JFET techniques to produce parts that are extremely simple to incorporate into circuit designs. Low-Noise JFETS Linear Systems’ ultra-low-noise and low-noise JFETs are the result of decades of focused R&D. Our lithography and fabrication techniques provide not only noise performance, but also low Idss and other important parametric conformance. Our dual JFETs are tightly matching over temperature ranges for high common mode noise rejection. Electrical selections of these parts are available. Low Leakage Diodes Current Regulating Diodes Linear Systems’ low-leakage picoamp diodes (PADs) and current-regulating diodes provide options when design engineers must protect the input section from over-current and over-voltage conditions. We provide these components in a wide range of electrical characteristics and packages. DMOS 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. Trusted Among Industry Leaders Linear Systems provides components and technical support to world-class designers enabling them to make world-class products. We fabricate and hold in inventory large quantities of wafers to minimize or eliminate supply chain risk for our production partners. Since 1987, we’ve established a world-class reputation for making sure the right parts get built and delivered on time, every time. Explore Our Products Linear Systems’ small-signal discrete components provide the basis for thousands of world-class designs. Please click below to see the full range of semiconductors we provide. Datasheets

< Back LSJ/SST74 Series SINGLE, ULTRA-LOW NOISE, P-CHANNEL JFET AMPLIFIER The LSJ/SST74 Single, Ultra-Low noise, P-Channel JFET Amplifier is a direct replacement for the Toshiba 2SJ74. 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: LSJ74A TO-92 3L RoHS LSJ74B TO-92 3L RoHS LSJ74C TO-92 3L RoHS LSJ74D TO-92 3L RoHS SST74A SOT-23 3L RoHS SST74B SOT-23 3L RoHS SST74C SOT-23 3L RoHS SST74D SOT-23 3L RoHS Datasheet Spice Model Application Notes

< Back J/SST/U308 Series SINGLE, HIGH FREQUENCY, N-CHANNEL JFET AMPLIFIER The J/SST/U308 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. The series is available in the TO-92 3L RoHS, TO-18 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: J308 TO-92 3L RoHS J309 TO-92 3L RoHS J310 TO-92 3L RoHS U308 TO-18 3L RoHS U309 TO-18 3L RoHS U310 TO-18 3L RoHS SST308 SOT-23 3L RoHS SST309 SOT-23 3L RoHS SST310 SOT-23 3L RoHS U308 Die U309 Die U310 Die Datasheet Spice Model Application Notes

< Back LS190 GENERAL PURPOSE The LS190 is a General Purpose Single N-Channel JFET Amplifier. This part is available in the TO-92 3L package, as well as the SOT-89 3L package. 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. Datasheet Spice Model Application Notes

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< Back LS846 SINGLE, LOW-LEAKAGE, LOW-NOISE, N-CHANNEL JFET AMPLIFIER The LS846 Single, Low-Leakage, Low-Noise, N-Channel JFET Amplifier is a single version of LS844 Series. It is ideal for Low Noise and Low Leakage 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: LS846 TO-72 4L RoHS LS846 TO-92 3L RoHS LS846 SOT-23 3L RoHS LS846 Die Datasheet Spice Model Application Notes

< 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