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When it comes to designing ultra-sensitive analog systems, noise performance isn’t a feature—it’s a necessity. At Linear Systems, we understand the critical role that low-noise discrete components play in high-performance signal chains. That’s why our LSK389 Series Ultra-Low Noise, Monolithic Dual N-Channel JFET  continues to set the standard for analog engineers across the globe. 100% Noise Tested – The Industry First Originally re-released in 2020, the LSK389 is now 100% noise tested  to guarantee it meets or exceeds both 1/f and broadband noise specifications. Using the world’s only large-scale sub-nanovolt testing capability, Linear Systems screens each unit to ensure: No burst noise (RTN or popcorn) Ultra-low noise performance down to 1.3nV/√Hz (typ) Whether you're building high-end audio equipment, ultra-sensitive sensors, or low-noise op amps, you can rely on consistent, production-grade noise performance. Trusted in Underwater Acoustic Systems The LSK389  and its single-device counterpart, the LSK170 , are widely used in underwater acoustic applications  where extremely low-noise signal amplification is essential. These applications include: Sonobuoys  used in anti-submarine warfare (ASW) Towed array sonar systems  for naval surveillance Hydrophones  for marine research and underwater audio detection Underwater modems and transducers  for acoustic communication and navigation Passive and active sonar systems  used in defense and industrial marine applications In all of these systems, signals travel farther and faster underwater than through air, and JFET-based amplifier circuits are required to cleanly capture and process those signals. The LSK389’s ultra-low noise, tight matching, and high input impedance make it a top choice for these precision front-end amplifiers  that are vital to sonar and underwater communications equipment. Why the LSK389? The LSK389 isn’t just another low-noise JFET. Its monolithic interleaved dual construction  provides superior IDSS matching, better thermal tracking, and performance advantages that discrete or non-monolithic dual JFETs can’t match. Key Features: Four IDSS grading options for design flexibility Tight matching: IVGS1-2 ≤ 15mV max High gain: Gfs = 20mS (typ) Low capacitance: 25pF (typ) Available in SOIC-8 and TO-71 packages Part of a Complete Low-Noise JFET Family The LSK389 is the cornerstone of our low-noise JFET lineup: LSK170  – N-channel single version LSJ74  – P-channel equivalent LSK489  – N-channel dual (lower capacitance, slightly higher noise) LSJ689  – P-channel dual version Each is part of Linear Systems' Improved Standard Products® , offering lower noise than competitors' equivalents. 📞 For more information, contact us at (510) 490-9160  or sales@linearsystems.com 🌐 Visit: www.linearsystems.com

🔬 Exploring the Reversed Sziklai Pair  🔍 Check out this clever hybrid design that flips the script on traditional amplifier topology!   📌 What makes it interesting? – Bipolar input = lower input impedance– Wide input range: 0.1mV to 12mV– Frequency response: 100Hz – 620kHz– Voltage gain ≈ 100 | Current gain ≈ 1.5– Distortion as low as 0.89%   This design demonstrates how blending technologies can lead to simple yet effective results in audio and signal processing. A great example of innovation through circuit simplicity.   📄 Source: https://iopscience.iop.org/article/10.1088/1757-899X/225/1/012152/pdf   Explore industry-leading JFETs at: www.linearsystems.com 💡 Follow us for more #FETFriday insights! #AnalogDesign #JFET #BipolarTransistors #AudioEngineering #CircuitDesign #ElectronicsInnovation

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 DFN Sample Kit Overview Now it’s easier than ever to test-drive Linear Systems’ most popular parts in one of the industry’s smallest leadless packages. This kit includes a sampling of discretes in the near chip scale footprint, DFN 8L package. The DFN package is a plastic encapsulated package with a copper lead frame substrate. It offers a thin profile, low weight and good thermal and electrical performance. Electrical contact to the PCB is made by soldering perimeter leads to PCB. There is no die attach pad exposed on the bottom surface of the package, which provides more flexible PCB level circuitry routing and in some cases, more thermal resistance for the heat conduction from PCB to component. In this kit you will receive 3 pieces of each of the following parts: 174 DFN 8L RoHS: P-Channel, Single, JFET Switch 4392 DFN 8L RoHS: Low Noise, N-Channel JFET Switch PAD5 DFN 8L RoHS: Low Leakage, Single, Pico-Amp Diode 589 DFN 8L RoHS: Monolithic Dual, N-Channel JFET 489 DFN 8L RoHS: Low Noise, Low Capacitance, Monolithic Dual, N-Channel JFET 689 DFN 8L RoHS: Low Noise, Low Capacitance, Monolithic Dual, P-Channel JFET 352 DFN 8L RoHS: Tightly Matched, Monolithic Dual, PNP Transistor 312 DFN 8L RoHS: Tightly Matched, Monolithic Dual, NPN Transistor Ordering Information When ordering this kit please use the following part call out: DFN SAMPLE BOX

HIGH VOLTAGE, SUPER BETA, MONOLITHIC DUAL, NPN TRANSISTOR < Back LS301 Series HIGH VOLTAGE, SUPER BETA, MONOLITHIC DUAL, NPN TRANSISTOR The LS301 Series High Voltage, Super Beta, Monolithic Dual, NPN Transistor is a direct replacement for the Micro Power Systems MP301, MP302, MP303 Series. It is ideal for Small Signal Transistors, Super Beta, 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: LS301 TO-71 6L RoHS LS302 TO-71 6L RoHS LS303 TO-71 6L RoHS LS301 TO-78 6L RoHS LS302 TO-78 6L RoHS LS303 TO-78 6L RoHS LS301 PDIP 8L RoHS LS302 PDIP 8L RoHS LS303 PDIP 8L RoHS LS301 SOIC 8L RoHS LS302 SOIC 8L RoHS LS303 SOIC 8L RoHS LS301 Die LS302 Die LS303 Die Datasheet Spice Model Application Notes

LOW NOISE, LOW CAPACITANCE SINGLE P-CHANNEL JFET < Back LSJ289 LOW NOISE, LOW CAPACITANCE SINGLE P-CHANNEL JFET The LSJ289 is a Low Noise, Low Capacitance, Single P-Channel JFET. Available in the TO-92 3L RoHS 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: LSJ289 TO-92 3L RoHS LSJ289 SOT-23 3L RoHS LSJ289 Die Datasheet Spice Model Application Notes