< Back SD5400/SD5000 Linear Systems Mar 17, 2023 Introducing Family of Quad N-channels NEWS RELEASE FOR INFORMATION CONTACT: Linear Systems, Inc. Sales Department Phone: (510) 490-9160 Email: sales@linearsystems.com Linear Systems Announces the Immediate Availability of SD5400 / SD5000 Family of Quad N-Channel Enhancement Mode Lateral DMOS Analog Switches FREMONT, CA – Linear Systems is announcing the immediate availability of the 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 a unique combination of 70 ohms "ON" resistance and a reverse transfer capacitance of 0.5 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 include gate ESD protection with zener diodes. The surface mount versions, SD5400 / SD5401, are available in 14 and 16 pin narrow body SOIC packages. The thru-hole versions, SD5000N / SD5001N, are available in 16 pin DIP packages. 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 - Vision Systems Delivery: Factory Stock For more information, contact Linear Systems at sales@linearsystems.com or call (510) 490-9160. 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.

< Back Jaime Cook: VP of Operations & Market Development Linear Systems Nov 21, 2024 Jaime Cook Appointed VP of Operations & Market Development at Linear Systems, Inc. Fremont, CA – October 1, 2024 – Linear Integrated Systems, Inc. is pleased to announce the appointment of Jaime L. Cook as Vice President of Operations and Market Development. In this pivotal role, Jaime will oversee all operational functions and spearhead market development initiatives. Jaime Cook has been a valued member of the Linear Systems team since 2009. Before stepping into her new role, Jaime served as Sales Manager, Director of Sales, and VP of Operations, gaining extensive experience across multiple facets of the company. Jaime brings a wealth of knowledge and expertise to her position as VP of Operations & Market Development. She holds bachelor's degrees in Real Estate and Land Use, as well as Strategic Management. Her education, certifications, and work experience have honed her skills in strategic planning, negotiation, and relationship building—qualities that significantly contribute to her expanded responsibilities at Linear Systems. “I’m incredibly proud to have built my career at Linear Systems and to be part of a team of exceptional individuals committed to producing the industry’s best specialty linear semiconductors while consistently meeting the highest standards of performance and reliability,” said Cook. “I am excited to expand my responsibilities, drive operational excellence, and lead efforts to explore new market opportunities.” Cindy L. Johnson, CEO of Linear Systems, stated, “Jaime’s leadership in operations and market development is pivotal as we aim to expand our product reach and strengthen customer relationships. Her strategic vision is vital to our mission of delivering ultra-reliable JFETs and other components that enable our clients to achieve outstanding performance in their designs.” Founded 37 years ago 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 .

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 JFETs for VC Circuits Introduction Linear Integrated Systems manufactures a variety of FETs (Field Effect Transistors). In particular they have a variety of matched dual products. There are advantages in having matched devices. For example, if you are building a twochannel stereo audio product, having two or four devices in the same package allows for the two audio channels to be more closely matched. This paper will explore using FETs in voltage controlled circuits. Several approaches will be shown: 1. Using FETs as voltage controlled resistors. 2. Using FETs as voltage controlled amplifiers and active mixers. 3. Using FETs as voltage controlled phase shifters for processing music. 4. Using FETs as voltage controlled band pass filters. We will also explore ways to reduce nonlinearities or distortions and automatically bias the FETs. Read More

SINGLE, HIGH FREQUENCY, N-CHANNEL JFET AMPLIFIER < Back 2N/PN/SST4416 Series SINGLE, HIGH FREQUENCY, N-CHANNEL JFET AMPLIFIER The 2N/PN/SST4416 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. 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: 2N4416 TO-72 4L RoHS 2N4416A TO-72 4L RoHS PN4416 TO-92 3L RoHS PN4416A TO-92 3L RoHS SST4416 SOT-23 3L RoHS SST4416A SOT-23 3L RoHS 2N4416 Die 2N4416A Die Datasheet Spice Model Application Notes

< Back LSJ689 App Note Introduction The dual monolithic P-channel LSJ689 is the complement to the N-channel LSK489. Both devices feature low offset, low noise and low capacitance. They enable the efficient implementation of fully complementary input stages without many of the device matching requirements when pairs of discrete devices are employed. Used alone, the LSJ689 also enables the implementation of more traditional differential input stages in applications where P-channel devices are preferred. Features of the LJ689 include: Low noise on the order of 2 nV/Hz Low gate-drain capacitance, typically 3pF Low gate leakage current typically 3pA (Vds = 15V, Id = 1mA) Breakdown voltage of 50V o IDSS range of 5-20 mA Typical transconductance of 3mS at Id = 1mA This note covers the full-complementary input stage application for the LSJ689 in combination with the LSK489. Read More

MONOLITHIC DUAL AND SINGLE, PNP TRANSISTOR < Back LS3550 Series MONOLITHIC DUAL AND SINGLE, PNP TRANSISTOR Previous Next

Linear Systems designs and manufactures the highest-performance line of monolithic dual JFETs in the industry. Contact us for a quote! Back LS844 Series ULTRA-LOW NOISE, LOW-DRIFT, MONOLITHIC DUAL N-CHANNEL JFET AMPLIFIER The LS844 Series Ultra-Low Noise, Low-Drift, 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: LS844 TO-71 6L RoHS LS845 TO-71 6L RoHS LS844 TO-78 6L RoHS LS845 TO-78 6L RoHS LS844 PDIP 8L RoHS LS845 PDIP 8L RoHS LS844 SOIC 8L RoHS LS845 SOIC 8L RoHS LS844 Die LS845 Die Datasheet Spice Model Application Notes

< Back J201 App Note Introduction Linear Systems products enable customers to build the lowest-noise signal chains possible. The J201 N-channel JFET is optimized for high gain. The part is particularly suitable for use in low power or high impedance amplifiers. Read More

< Back Cloud Microphones Linear Systems Mar 17, 2023 Keeping the Family Business Going Cloud Microphones Among the more lamented departures from the world of electronics was RCA's microphone business. A few years ago I visited the college radio station where I'd worked in the 80s, and one of my former professors was proudly showing off an RCA 44A ribbon microphone the school had acquired. Though it had a few dents and scratches, it was a work of art. Soon after I saw it, the university's music department borrowed the mic for recording sessions and never gave it back. A typical RCA 44A ribbon microphone(Source: Wikipedia) Like original McIntosh MC275 amps, old ribbon microphones are collected because, when used correctly, they produce sounds hard to get elsewhere. But eventually even the vintage electronics section of eBay runs dry.One of the companies helping to provide new ribbon microphones and preamps, Cloud Microphones, has been able to continue the work RCA did through collaboration between a musician/businessman, Rodger Cloud, and Stephen Sank, son of RCA's ribbon microphone designer Jon R. Sank.Jon Sank had done design work at RCA that included the BK-10A and the BK-11. When he passed away in 1998, he left Stephen with the knowledge and other tools to continue the ribbon microphone work that RCA had left behind.Cloud came to Tucson as a singer/songwriter and started getting involved with bands and recording music. Sank moved into an office suite next door to Cloud's studio, and in 2006 they started working together.“So we collaborated on the initial designs of some of the mics, and I worked with him first refurbishing the vintage mics and so forth, and I really fell in love with the technology as it was in the 1930s and 1940s. It was just pretty darn great,” Cloud told me. “However, there were certainly challenges with the technology, most notably those types of microphones had a really weak sensitivity and are really difficult to deal with in terms of amplifying them.”Cloud said that even with exceptional amplifiers, it was very difficult to use ribbon microphones to record some softer sounds because of the gain requirements. This led Sank and Cloud to develop the JRS-34 ribbon microphone, named in honor of Sank's father and noting the year he was born. Rodger Cloud with his version of the RCA mic “As we worked on it, I really felt the need for an active microphone,” Cloud said. “And we really pushed ourselves to come up with something. We weren't just coming up with something that was OK. It had to be absolutely audiophile quality.” The result was a ribbon microphone that uses a Linear Systems LSK389 monolithic dual n-channel JFET to amplify the signal. Cloud wanted a dual JFET that would provide common-mode rejection in his amplifier, and settled on the LSK389. “It's just the JFET that we like the best. The power requirements for the circuit are low. We tested all of them, and this is the one that seemed to give us the results we were looking for.”Wiley Ross, who runs the recording studio at the University of Arizona, is a big fan of the Cloud's gear. “I use the Cloudlifter almost always when recording from a passive microphone,” he wrote in a recent email to me.“I don't use it because I need the gain, I have plenty with my Millennia Media HV-3R, but because the sound is better; richer, more depth,” Ross wrote. “With the Cloudlifter Z it's like having your mic locker expand to do all the different sonic possibilities afforded.”Ross added that Cloud's JRS-34 is a “main-stay” ribbon microphone. “I love it on all wind and brass instruments. Listening tests with other fine ribbons with faculty, students, and staff confirm its superiority.” The Cloudlifter Using a JFET-based circuit wasn't an obvious solution at first, Cloud said. “We were looking at several options with the microphones, and I was the one who suggested that we try the JFET technology. We were also looking at chip-based technology, different ways we could activate the mic. One of the problems with a chip-based design was we were going to have to use a couple of nine-volt batteries. We just couldn't figure out a way to get it to work on the phantom.”Using the Linear Systems' LSK389, which combines ultra-low noise with low IDSS , enabled Cloud and Sank to build a phantom-powered active ribbon microphone. Cloud said the prototype of the active circuitry was set up in a test box to enable testing various microphones. “And it only took a few moments to realize that this box is cool. And that's how the Cloudlifter accidently came to be.”The Cloudlifter is the active part of the company's ribbon microphone broken out into a format that can be used with many microphones people already have, and it soon became the company's best-selling product. “It's a game-changer, or more accurately a 'gain-changer,' because it allows people to use microphones that they normally would not even consider for softer sources, acoustic instruments, because the problem in the past has always been defeating the noise floor of the preamplifier.”The Cloudlifter is a standalone product customers could use to boost the gain of other microphones. It plugs into the line coming from a microphone and uses any standard phantom powered microphone input device to provide up to 25dB of “ultra-clean, transparent gain.”The Cloudlifter is recommended for: recording direct into a digital audio workstation interface; working with noisy or low gain preamps; using mixers/preamps that impair the sound at higher gain settings; working with passive ribbon microphones or low-output dynamic microphones; capturing softer sound sources such as acoustic instruments and voice; and when using long cable runs.When Cloud and his colleagues were first designing the circuit, they used Toshiba JFETs. “We found out about Linear Systems' products so we tried and we compared it,” says Cloud. “We liked it better than Toshiba. It was still an improvement, and I liked what it did for the Cloudlifter — it seemed to drop the noise floor even further, which is always a good thing when you're dealing with really low-sensitivity microphones.”Cloud said that after sales increased for the Cloudlifter, it became too labor intensive to match the single LSK170 JFETs. “It was becoming almost a full-time job to hand-match these little JFETs, so we started looking at the duals, and we went to the surface-mount technology, and I've got to say the Linear Systems duals are awesome. We can't match them that closely by hand, and the failure rate of the entire card as a whole is less than one in a thousand now. And we couldn't achieve that making them by hand.”The common-mode rejection enables the Cloudlifter to “pass clean audio in the worst of circumstances, next to a radio tower, in EMI hell,” according to Cloud.

HIGH INPUT IMPENDANCE, SINGLE, BIFET AMPLIFIER < Back LS320 HIGH INPUT IMPENDANCE, SINGLE, BIFET AMPLIFIER The LS320 Single, high Input Impedance, BIFET Amplifier is a direct replacement for Amperex equivalent part. It is ideal for High Impedance Sensor Amplifier Applications. Available in the TO-72 4L RoHS, TO-92 3L RoHS and SOT-23 3L RoHS package, as well as bare die. Advanced screening options are available for our diverse product lineup, featuring JFETS, Bipolar transistors, MOSFETs, current regulators, and Diodes. Our special screening covers all the parameters listed in the standard datasheet, including comprehensive package pin-out. Connect with our experienced technical team to discuss your specific needs and tailor your requirements—email us at support@linearsystems.com or call (510) 490-9160. MOQ applies to these specialized services. Ordering Information Below are the options you have when ordering this part series: LS320 TO-72 4L RoHS LS20 TO-92 3L RoHS LS320 SOT-23 3L RoHS LS320 DIE Datasheet Spice Model Application Notes

HIGH INPUT IMPEDANCE, N-CHANNEL JFET AMPLIFIER < Back LS5301 HIGH INPUT IMPEDANCE, N-CHANNEL JFET AMPLIFIER The LS/PF/SST5301 Series Single, High Input Impedance, N-Channel JFET Amplifier is a direct replacement for the Fairchild equivalent part. It is ideal for Very High Input Impedance Applications. Available in TO-72 4L 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: PF5301 TO-92 3L RoHS LS5301 TO-72 4L RoHS SST5301 SOT-23 3L RoHS LS5301 Die Datasheet Spice Model Application Notes