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< Back LS310 Series TIGHTLY MATCHED, MONOLITHIC DUAL, NPN TRANSISTOR The LS310 Series, Tightly Matched, Monolithic Dual, NPN Transistor is a direct replacement for Analog Devices MAT series and National LM3494 series. It is ideal for Tight Matching, Small Signal Transistor Amplifier & Switching Applications. It is available the in TO-71 6L, TO-78 6L, PDIP 8L, SOIC 8L, SOT-23 6L and DFN 8L 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: LS310 TO-71 6L RoHS LS311 TO-71 6L RoHS LS312 TO-71 6L RoHS LS313 TO-71 6L RoHS LS310 TO-78 6L RoHS LS311 TO-78 6L RoHS LS312 TO-78 6L RoHS LS313 TO-78 6L RoHS LS310 PDIP 8L RoHS LS311 PDIP 8L RoHS LS312 PDIP 8L RoHS LS313 PDIP 8L RoHS LS310 SOIC 8L RoHS LS311 SOIC 8L RoHS LS312 SOIC 8L RoHS LS313 SOIC 8L RoHS LS310 SOT-23 6L RoHS LS311 SOT-23 6L RoHS LS312 SOT-23 6L RoHS LS313 SOT-23 6L RoHS 311 DFN 8L RoHS 312 DFN 8L RoHS LS310 Die LS311 Die LS312 Die LS313 Die Datasheet Spice Model Application Notes

< Back Millions of Devices in Stock! Laura Madonna Mar 17, 2023 LS844 monolithic dual small-signal JFET, 3N163 small-signal MOSFET, LS320 BiFET and many more! FREMONT, Calif., Aug. 26, 2021 /PRNewswire/ -- Linear Systems, a world class producer of ultra low noise JFETS and other small-signal discrete semiconductors, has announced the large-scale availability of five of its world-class components. These parts – which range from low-noise monolithic dual JFETs to small-signal MOSFETs – are available in wafer form in quantities ranging from one million to ten million for immediate packaging and shipment. "All these parts meet our industry-leading datasheet specifications," said Linear Systems President Timothy McCune. "We've been aggressive in the past in building up substantial buffer stocks of wafers, and this enables us to provide these quantities of parts now." "We've been aggressive building up substantial buffer stocks of wafers for five world-class components to ship now." Parts available from Linear Systems for shipment after packaging in quantities over a million include: 1) the LS844 monolithic dual small signal JFET, with one million dice in wafer form in stock; 2) the 3N163 small-signal MOSFET, with three million dice in wafer form in stock; 3) the LS320 BiFET, with 1.3 million dice in wafer form in stock; 4) the LS/2N4391 N-channel JFET Series, with 2.5 million dice in wafer form in stock; 5) the LS/2N4117 N-channel JFET Series, with 14.3 million dice in wafer form in stock. These parts are also available in bare die and sorted wafer form. The LS844 monolithic dual, small-signal, low-drift N-channel JFET is a low-noise front-end amplifier with high Common Mode Rejection Ratio and excellent matching over a wide range of temperatures. Download Data Sheet. The 3N163 is a small-signal MOSFET used in sensor applications ranging from gas detection to piezo devices. Linear Systems' 3N163s typically have half the noise of those made by other companies. Download Data Sheet . The LS320 Single, Monolithic high Input Impedance, BiFET Amplifier is a direct replacement for Amperex equivalent part. It is ideal for High Impedance Sense Amplifier Applications. Download Data Sheet . The 2N/PN/SST4391 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. Download Data Sheet . The 2N/PN/SST4117A 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. It is ideal for High Input Impedance Application. Download Data Sheet . Aside from million-plus parts inventories, Linear Systems keeps on hand significant quantities of all its parts, including its industry sector-leading LSK389 monolithic dual N-channel ultra-low-noise JFET. About Linear Integrated Systems: 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; Hydrophone/Sonobuoys; Industrial Controls; and Hybrids. For these and other parts, download Linear Systems' Product Selection Guide and Linear Systems' Databook . For more information, visit www.linearsystems.com . Media Contact: Laura Madonna (202) 441-0791 laura@linearsystems.com

< Back SD5400/SD5000 ​ Mar 17, 2023 Introducing Family of Quad N-channels LINEAR INTEGRATED SYSTEMS announces the immediate availability of SD5400 / SD5000 Family of Quad N-channel Enhancement Mode Lateral DMOS Analog Switches, specifically designed for high speed switching applications. These ultra-fast switches offer improved accuracy, speed and throughput, with less glitching or distortion than JFETs or multiplexers. Designed for high frequency RF operation, they provide switching speeds of 1ns with the unique combination of 70ohms "ON" resistance, and a reverse transfer capacitance of .5 pf. A maximum threshold of 1.5 volts permits simple TTL and CMOS driving for small signal applications. The SD5400 / SD5000 can switch analog signals up to +/- 10 volts, while the SD5401 / SD5001 can switch signals up to +/- 5 volts. All versions have gate ESD protection zener diodes. The surface mount versions SD5400 / SD5401 are available in a 14 and 16 pin narrow body SOIC packages. The thru-hole versions SD5000N / SD5001N are available in a 16 pin DIP package. All package types are available with special electrical selection, including bare die form. Summary of Features: High Speed Switching (td (ON) / (OFF) = 1ns max) Ultra Low Reverse Capacitance (Crss = 0.5 pF max) Low Turn-On Threshold Voltage (Vgs(th) = 1.5V max) Switches Analog Signals up to +/- 10 volts CMOS and TTL Compatible Second Source replacement for Calogic and Siliconix SD5400 / SD5000 Families Available in Surface Mount SOIC-14,16 pin, PDIP-16 Packages, and Bare Die Applications: ATE (Automatic Test Equipment) Analog Switch, Analog to Digital and Digital to Analog Converters, Laser Drivers, Medical Imaging, Multiplexer, Sample and Hold, Switch Driver and Vision Systems Delivery: Factory Stock FOR INFORMATION CONTACT: Linear Integrated Systems Phone: 510-490-9160 Fax: 510-353-0261 Email: sales@linearsystems.com Website: www.linearsystems.com

< 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 IT120 Series MONOLITHIC DUAL, NPN TRANSISTOR The IT120 Series Monolithic Dual, NPN Transistor is a direct replacement for the Intersil IT120 Series. It is ideal for Small Signal 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: IT120A TO-71 6L RoHS IT120 TO-71 6L RoHS IT121 TO-71 6L RoHS IT122 TO-71 6L RoHS IT120A TO-78 6L RoHS IT120 TO-78 6L RoHS IT121 TO-78 6L RoHS IT122 TO-78 6L RoHS IT120A PDIP 8L RoHS IT120 PDIP 8L RoHS IT121 PDIP 8L RoHS IT122 PDIP 8L RoHS IT120A SOIC 8L RoHS IT120 SOIC 8L RoHS IT121 SOIC 8L RoHS IT122 SOIC 8L RoHS IT120A Die IT120 Die IT121 Die IT122 Die Datasheet Spice Model Application Notes

< 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

< Back AEA ​ Mar 17, 2023 AEA’s Ribbon Microphones & Linears’ JFETs AEA When John Kurlander sought to capture the vast array of sound for the Lord of the Rings movies, he turned to Wes Dooley and his ribbon microphones. And for years, when Wes needed ultra-low-noise semiconductors to build and amplify those microphones, he turned to Linear Systems, Inc. “Linear Systems has kept that tradition going of making parts that are competitive with the [discontinued Toshiba] SK170s and 389s,” Dooley said in a recent interview. “And that gives us the ability to make compact, high-performance audio products.” “We make the quietest ribbon mic in the world, the A440, and the higher SPL A840. Both of them use the [Linear Systems] LSK389, for the output drivers and their current supply,” Dooley said. Dooley's company, Audio Engineering Associates (AEA), also uses the LSK389 in front ends of its RPQ and RPQ 500 preamplifiers, which were designed for use with ribbon microphones. AEA's microphone business started with ribbon mics for classical music used as movie scores. “John Kurlander did all three Lord of the Rings using AEA mics on strings left and right almost as strong in the mix as the main orchestra mics,” Dooley said. “When you work with such people, one really learns to be of service.” AEA's customer list reads like a Who's Who of Grammy and Academy Award-winning recording engineers and artists. Among the many examples, sound engineer Michael Bishop, winner of eight Grammy awards, extensively uses AEA's A840 microphones and AEA preamps for his recordings. Shawn Murphy, who's worked on over 330 films and won an Academy award for Jurassic Park, also relies on AEA's preamps and microphones. One of the best parts of AEA's website is the long list of reviews and mentions by users . Dooley, a lifelong ribbon microphone enthusiast and developer, got into the business by repairing ribbon mics built by RCA during the golden age of radio. “We started servicing mics in '76 when RCA shut down making them,” he said. “Many of our favorite RCA designs were from the mid '30s, when a designer's foremost tool was listening to live music. Critical listening was the gold standard as acoustical measurements were cumbersome.” “We've adopted that approach, which is: musicality trumps metrics. The mic has to sound good to people in the music business,” Dooley said. “If it doesn't sound good, measurements don't matter. Once you have a mic that sounds good to people who have experienced ears, then measurements are very important, as they are the key to consistent production.” “So we first strive to make sure it sounds musical, and then we measure what it does,” Dooley said. “Because, as one of my mentors, Richard Heyser, said, if it measures well but doesn't sound right, then you're measuring the wrong things. Often you find you don't know what the right thing to measure is. Over time you discover what those metrics might be. Ultimately, it's a matter of how it sounds. Since we come from an acoustic music tradition, it's pretty simple: you put the mic in front of live music, and compare that live sound with the reproduction, to see how close it is.” Dooley told the story of working with legendary bluegrass fiddle player/violinist Richard Greene. Greene, along with his wife, a violinist with the LA Chamber Orchestra, recorded samples using over 20 microphones. “The next day, when they had 'fresh ears,' they listened to all the recordings and said the one made using our ribbon microphones was the best,” Dooley said. “And that's what we try for, for the musicians to experience that this is the closest they've ever heard to an actual performance.” Asked to comment for this article, Greene had high praise for Dooley and his microphones. “Silky, smooth, best violin sound I ever heard, Wes is amazing and his tech support and other free maintenance are over the top,” Greene wrote. “I will never have any use for any other mic on my violin. I have the AEA 440.” Dooley said this close interaction with artists drives how he builds microphones and preamps. “The whole thing,” he said, “is to build tools they need. That is the key to survival for a small business doing high-performance products.” The LSK389 “is a very good part for manufacturing,” Dooley said. AEA uses the “C” grade of the LSK389. “We started with the 'A' [grade], but then we realized it didn't make any difference for what we were doing,” he said. The LSK389 is graded by IDSS ; all three grades have the same ultra-low-noise characteristics. The Linear Systems LSK389 part used by AEA is an ultra-low-noise junction field effect transistor. Linear System Founder and CEO John H. Hall began working on a JFET similar to Toshiba's 2SK389 about the time that the Japanese company began to discontinue the device 10 years ago. “Toshiba kept its production process for the 389 secret, so we had to figure out on our own how to build something to the same specification, which was extremely difficult,” Hall said. Expertise brought to Linear Systems is based on processes and products Hall developed since 1962 at Amelco, Union Carbide, Intersil, and Micro Power Systems. Hall, a protégé of Silicon Valley legend Dr. Jean Hoerni, was the director of IC Development at Union Carbide, co-founder and vice president of R&D at Intersil, and founder/president of Micro Power Systems. Much of Linear Systems' current development work focuses on lower-noise JFETs. The production techniques Hall conceived to squeeze the last bit of noise out of the 389 led to development of another part, the LSK489. The LSK489 has less transconductance than the 389, and though this increases noise slightly, it makes the part easier to design into new circuits. “While the 389 is the perfect part for some users, such as Wes Dooley, who need the lowest noise levels in existence, we found that the high gate-to-drain capacitance of the 389 caused problems for some of our other customers,” Hall said. “Building a high transconductance part, such as the 389, formed part of the basis for providing ultra-low-noise levels, but the high input capacitance causes intermodulation distortion in some higher-frequency applications,” Hall said. “Since we had created some advanced processing techniques to make the 389, we decided to go back and look at creating a part with lower capacitance using the same processes.” Though Dooley's ribbon microphone and other devices take advantage of the 389's low noise level, other developers could tolerate a slightly higher noise level in a part that has much lower input capacitance due to a lower transconductance, Hall said. The lower capacitance and other features make the LSK489 a lower-noise, functional replacement for Linear Systems' LS840-series of JFETs, as well as the Siliconix U401-403 series. Dooley's precision ribbon microphones are perfect applications of the LSK389, Hall said. “Both ribbon microphones and JFETs are very difficult to design and build, but there's really no other way to achieve the level of performance needed than to do the work this way.” The circuit design work using the LSK389s was done for AEA by Fred Forssell of http://www.forsselltech.com . For more on Dooley's microphones, go to: http://www.ribbonmics.com Data sheets for the LSK389 and LSK489, the application notes for the LSK489, and a good paper on general JFET theory and use can be downloaded at: http://linearsystems.com .

< 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

Back SST/U440 Series WIDEBAND HIGH GAIN MONOLITHIC DUAL N-CHANNEL JFET AMPLIFIER The SST/U440 Series Wideband, High-Gain, Monolithic Dual N-Channel JFET Amplifier is targeted for use in a wide range of precision instrumentation and sensor applications. The series is available inThe SST/U440 Series Wideband, High-Gain, Monolithic Dual N-Channel JFET Amplifier is targeted for use in a wide range of precision instrumentation and sensor applications. The series is available in the TO-71 6L and SOIC 8L RoHS package, as well as in die form. Advance d 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: U440 TO-71 6L RoHS U441 TO-71 6L RoHS SST440 SOIC 8L RoHS SST441 SOIC 8L RoHS Datasheet Spice Model Application Notes

< Back FETching Discrete Amplifier Introduction Low-noise amplifiers for photodiode, piezoelectric, and other instrumentation applications typically call for circuit parameters such as extremely high input impedance, low 1/f noise, or subpicoamp bias currents that cannot be met with available integrated products. This article discusses the requirements and challenges of designing a low-noise amplifier using discrete components, with particular emphasis on input-referred noise and offset voltage trimming. Read More

< Back LS350 Series TIGHT MATCHING, MONOLITHIC DUAL, PNP TRANSISTOR The LS350 Series, Tight Matching, Monolithic Dual, PNP Transistor is a direct replacement for the Analog Devices MAT series and Micro Power Systems MP350, MP351, and MP352 Series. It is ideal for Tight Matching, Small Signal, Transistors Amplifier & Switching Applications. It is available the in TO-71 6L, TO-78 6L, PDIP 8L, SOIC 8L, SOT-23 6L and DFN 8L 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: LS350 TO-71 6L RoHS LS351 TO-71 6L RoHS LS352 TO-71 6L RoHS LS350 TO-78 6L RoHS LS351 TO-78 6L RoHS LS352 TO-78 6L RoHS LS350 PDIP 8L RoHS LS351 PDIP 8L RoHS LS352 PDIP 8L RoHS LS350 SOIC 8L RoHS LS351 SOIC 8L RoHS LS352 SOIC 8L RoHS LS350 SOT-23 6L RoHS LS351 SOT-23 6L RoHS LS352 SOT-23 6L RoHS 351 DFN 8L RoHS 352 DFN 8L RoHS 353 DFN 8L RoHS LS350 Die LS351 Die LS352 Die Datasheet Spice Model Application Notes

< 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