< 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

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

MONOLITHIC DUAL, NPN TRANSISTOR < 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: All Part Numbers within this Product Series 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

2N5018 SERIES LOW ON-RESISTANCE, P-CHANNEL JFET SWITCH < Back 2N5018 Series 2N5018 SERIES LOW ON-RESISTANCE, P-CHANNEL JFET SWITCH The 2N5018 Series Low On-Resistance, P-channel JFET Switch is a direct replacement for the Intersil and Siliconix-Vishay part series. It is ideal for low resistance switching applications. Available in the TO-18 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: 2N5018 TO-18 3L RoHS 2N5019 TO-18 3L RoHS Datasheet Spice Model Application Notes

SINGLE, LOW CAPACITANCE, ULTRA-HIGH INPUT IMPEDANCE N-CHANNEL JFET AMPLIFIER - DFN < Back 4117DFN SERIES SINGLE, LOW CAPACITANCE, ULTRA-HIGH INPUT IMPEDANCE N-CHANNEL JFET AMPLIFIER - DFN The 2N/PN/SST4117 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 series. It is ideal for high input impedance applications. This series is available in the DFN 8L RoHS miniature/non/magnetic package, as well as the TO-72 4L RoHS, TO-92 3L RoHS, SOT-23 3L RoHS package and 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: 2N4117 TO-72 4L RoHS 2N4118 TO-72 4L RoHS 2N4119 TO-72 4L RoHS PN4117 TO-92 3L RoHS PN4118 TO-92 3L RoHS PN4119 TO-92 3L RoHS SST4117 SOT-23 3L RoHS SST4118 SOT-23 3L RoHS SST4119 SOT-23 3L RoHS 2N4117 Die 2N4118 Die 2N4119 Die Datasheet Spice Model Application Notes

< Back DMOS App Note Introduction This Application Note describes in detail the principle of operation of the SD210/5000 series of high-speed analog switches and switch arrays. It contains an explanation of the most important switch characteristics, application examples, test data, and other application hints. Read More

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 2N5564 Series LOW NOISE, MONOLITHIC DUAL, N-CHANNEL JFET The 2N5564 Series is a Low Noise, Monolithic Dual, N-Channel JFET. These matched pairs of JFETs are mounted in a TO-71 package. The two-chip design reduces parasitics for good performance at high frequency while ensuring extremely tight matching. This series features high breakdown voltage, high gain, and <5 mV offset between the two die. It is a Pin-for-Pin Replacement for Siliconix-Vishay 2N5564 Series, available in the TO-71 6L 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: 2N5564 TO-71 6L RoHS 2N5565 TO-71 6L RoHS 2N5566 TO-71 6L RoHS 2N5564 Die 2N5565 Die 2N5566 Die Datasheet Spice Model Application Notes

< Back Military Sensor Signal Chains Introduction Higher-performance sensors are becoming increasingly important to modern battlefield systems. Sensors ranging from sonobuoys to radiation detectors are critical, leading-edge components of C4ISR systems. Better sensor systems enable earlier threat detection and more effective countermeasures. Military systems employ a wide range of sensors – nuclear, biological, and chemical sensing, infrared, electro-optical, laser, radar, and acoustical – that all have one aspect in common: the requirement for ultra-low-noise signal chains to produce the best possible sensor signal. Less-than-optimal front-end amplification means C4ISR clients receive inadequate information and are not able to make effective, real-time decisions. This paper describes techniques to employ to create the lowest-noise, most effect front-end amplification for sensor signal chains. Advanced lithography design and fab process techniques enable the creation of discrete components uniquely capable of performing the critical initial amplification of sensor signals. Integrated circuits contain a wide range of components and can include specialized design features that preclude design optimization for low noise. As this paper documents, ultra-low-noise discrete components added to an IC-based circuit will produce the lowest-noise signal chain. Though this paper focuses on the LSK489 dual monolithic Nchannel JFET, many other Linear Systems parts -- including the LSK389, LSK170 and LSK189 -- also are excellent sensor system components. Linear Systems is the world leader in ultra-low-noise monolithic dual JFETs and other front-end discrete components key to high-performance sensing systems. For over three decades, Linear Systems has led the development of this class of devices, and it continues to advance their design and introduce new sensor-specific parts. 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

< Back LSK489 Press Release Linear Systems Mar 17, 2023 Low-Capacitance Dual N-Channel JFET NEWS RELEASE FOR INFORMATION CONTACT: Linear Systems, Inc. Sales Department Phone: (510) 490-9160 Email: sales@linearsystems.com Linear Systems Announces the Availability of the LSK489 Low-Noise, Low-Capacitance Dual N-Ch JFET Designed for All (Audio & Non-Audio) Low-Noise Applications FREMONT, CALIFORNIA – December 10, 2012 – Linear Systems, a leading full-service manufacturer of specialty linear semiconductors, announces the immediate availability of its LSK489 1.8 nV/√Hz @ 1kHz, low-capacitance, N-Channel Monolithic Dual JFET. This is part of a family of ultra-low-noise dual JFETs specifically designed to provide users with better-performing, less-time-consuming, and cost-effective solutions for obtaining tighter IDSS matching and better thermal tracking than matching individual JFETs. Available in surface-mount and RoHS-compliant versions, the LSK489 is an ideal improved functional replacement for similar JFETs with inferior noise characteristics and higher gate-to-drain capacitance, making it suitable for space-limited circuits in audio and instrumentation applications. The LSK489 offers designers a significant increase in capabilities for a wide range of low-noise applications. Its lower capacitance, 4pF compared to 25pF in similar products, enables simpler circuit designs without the need for a cascode configuration, which can introduce higher circuit noise. Like the LSK389, the LSK489 features a unique design construction of interleaving both JFETs on the same piece of silicon, providing excellent matching, thermal tracking, and nearly zero popcorn noise. The LSK489 is available in surface-mount SOIC-8, thru-hole TO-71, and smaller SOT23-6 packages. Lead-free, RoHS-compliant versions are available. Linear Systems' domestic factory stock guarantees short lead times, ensuring no disruption in production schedules. Summary of Features: - Low Noise (typically 1.8 nV/√Hz @ 1kHz) - Nearly Zero Popcorn Noise - IDSS matching to 10% max - Low Offset/Tight Matching (|Vgs1 - Vgs2| = 20mV max) - Low Capacitance (CISS = 4pF) - High Input Impedance - High Breakdown Voltage (BVGSS = 40V Min) - Low-noise, reduced device count alternative for the classic Dual JFET Cascode Configuration - Improved replacement for Siliconix U401 series and the Linear Systems 844 series - Available in surface-mount SOIC-8, smaller SOT23-6 packages - Lead-Free/RoHS Compliant versions available Applications: - Microphone amplifiers - Phono preamplifiers - Audio amplifiers and preamps - Discrete low-noise operational amplifiers - Battery-operated audio preamps - Audio mixer consoles - Acoustic sensors - Sonic imaging - Instrumentation amplifiers - Wideband differential amplifiers - High-speed comparators - Impedance converters Pricing and Availability: - Price: $5.38 each (1,000 pcs) - Availability: Sampling now in SOIC-8, TO-71, and SOT23-6 package options - Delivery: Factory Stock 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, and MOSFETs. Datasheets, application notes, SPICE models, and additional information can be downloaded at www.linearsystems.com. For more information, contact Linear Systems at sales@linearsystems.com or call (510) 490-9160.

< Back LS26VPS/VNS Press Release Linear Systems Mar 17, 2023 New JFET Voltage-Controlled Resistors NEWS RELEASE FOR INFORMATION CONTACT: Linear Systems, Inc. Sales Department Phone: (510) 490-9160 Email: sales@linearsystems.com Build lower-voltage, lower-power circuits using Linear Systems' industry-leading voltage-controlled resistors. Linear Systems has expanded its family of JFET Voltage-Controlled Resistors (VCRs) for reduced-power circuits over IC-based devices. Two new additions to the JFET Voltage-Controlled Resistor Family include the LS26VNS, a Single N-Channel JFET VCR, and the LS26VPS, a Single P-Channel JFET VCR. Both the N and P-channel versions are made from the same die geometry, making them complementary. They join the existing VCR11N, a Dual N-Channel VCR. The advantages of using VCRs for voltage-controlled amplifier or voltage-controlled gain systems include: - VCR-based devices operate with lower voltage and power consumption, enabling battery-powered systems to last significantly longer. - VCR JFETs can be used with low-power op amps to provide a low-power solution for voltage-controlled gain systems. - With low voltage op amps such as the LMV358 or TLC272, VCR JFETs perform voltage-controlled gain at extremely low supply voltages, down to a single 3.3V power supply. Circuits can be designed for very low power consumption when combined with low voltage, low power op amps. For instance, using an LSK389A as a VCR for these low voltage circuits can provide significant efficiency gains. - Matched pair JFET VCRs (VCR11N or LSK389A) can provide two identical channels of voltage-controlled gain, where the control voltage tracks both channels. This can be used in stereo audio signal attenuation. In contrast, typical active voltage-controlled amplifiers drain more current and require higher minimum power supply voltages, needing at least +/- 4 volts for a specialized voltage control amplifier integrated circuit. P-Channel JFETs, including a J177, can be designed as a VCR circuit with a single power supply. For example, the P-Channel JFET VCR circuit is ideal with positive supply voltages since its control voltage to the gate is also positive. Product Details: - LS26VNS N-Channel Single JFET VCR: Drain-source resistance 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 of 38 Ω. - LS26VPS P-Channel Single JFET VCR: Drain-source resistance 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 of 50 Ω. Summary of Features : - LS26VNS (N-Channel Single) - RDS(on) 14-38 Ω - BVgss 30 Volts - Available in TO-92 3L, SOT-23 3L, DFN 8L, and Bare Die options - LS26VPS (P-Channel Single) - RDS(on) 20-50 Ω - BVgss 30 Volts - Available in TO-92 3L, SOT-23 3L, DFN 8L, and Bare Die options Applications: - Variable Gain Controls - Voltage Controlled Oscillators - Signal Attenuators - Musical Effects Applications - Adaptive Analog Filters - Automatic Gain Control Circuits - Clock Generators - Compressors - Electrometers - Energy Harvesters - Expanders - Hearing Aids - Light Dimmers - Modulators - Mixers - Artificial Neural Networks - Programmable Gain Amplifiers - Phased Arrays - Phase Lock Loops - Phase Controlled Dimming Circuits - Phase Delay and Advance Circuits - Tunable Filters - Variable Attenuators - Voltage Controlled Multivibrators - Waveform Generators Pricing and Availability: - 1,000+ pieces of the LS26VNS and LS26VPS in the TO-92 3L, SOT-23 3L, and DFN 8L packages are priced at $1.23 (USD) each. - Production quantities are available now with delivery from factory stock to 8 weeks. This product line is supported by application notes, datasheets, and SPICE models. For further technical resources, please click HERE . 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 found at www.linearsystems.com. For more information, contact Linear Systems at (510) 490-9160 or email sales@linearsystems.com. https://www.linearsystems.com/voltagecontrolledresistors/ls26vps