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< 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

< Back Low Leakage Diodes Introduction In circuit designs for sensor signal conditioning, the design engineer must protect the input section from over current and over voltage conditions. Op amps, ADC analog inputs, analog multiplexers, and [RS485] line receivers represent classes of devices that need protection. Often, the manufacturers of such devices specify the acceptable input range for voltage, or, in the case of an overvoltage condition, the allowable input current above which semiconductor or bonding wires may be damaged. Read More

< 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

GENERAL PURPOSE < 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

< Back Interfacing Sensors & Transducers Introduction Abstract: A discussion of methods of amplifying and signal-conditioning for sensors with low level outputs in the presence of high ambient electrical noise sources. Advantages and disadvantages of some common amplifier circuits are considered. Read More

P-CHANNEL JFET, VOLTAGE CONTROLLED RESISTOR < 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

SINGLE, LOW-LEAKAGE PICO AMP DIODES DFN PACKAGE < Back PAD Series DFN Package PAD-DFN SERIES MINIATURE/NON MAGNETIC 8-PIN DFN PACKAGE LOW LEAKAGE DIODE The PAD Series Ultra-Low Leakage, Protection Diode is a direct replacement for the Siliconix-Vishay part series. It is ideal for Pico Amp, Ultra-Low Leakage, Protection Diode Applications. This part series is available in the mineature DFN 8L RoHS package, as well as the TO-72 3L RoHS, TO-92 2L RoHS and SOT-23 3L RoHS 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: PAD1 DFN 8L RoHS PAD2 DFN 8L RoHS PAD5 DFN 8L RoHS PAD10 DFN 8L RoHS PAD20 DFN 8L RoHS PAD50 DFN 8L RoHS PAD100 DFN 8L RoHS PAD1 TO-72 3L RoHS PAD2 TO-72 3L RoHS PAD5 TO-72 3L RoHS PAD10 TO-72 3L RoHS PAD20 TO-72 3L RoHS PAD50 TO-72 3L RoHS PAD100 TO-72 3L RoHS JPAD1 TO-92 2L RoHS JPAD2 TO-92 2L RoHS JPAD5 TO-92 2L RoHS JPAD10 TO-92 2L RoHS JPAD20 TO-92 2L RoHS JPAD50 TO-92 2L RoHS JPAD100 TO-92 2L RoHS PAD1 SOT-23 3L RoHS PAD2 SOT-23 3L RoHS PAD5 SOT-23 3L RoHS PAD10 SOT-23 3L RoHS PAD20 SOT-23 3L RoHS PAD50 SOT-23 3L RoHS PAD100 SOT-23 3L RoHS PAD1 Die PAD2 Die PAD5 Die PAD10 Die PAD20 Die PAD50 Die PAD100 Die Datasheet Spice Model Application Notes

J111 SERIES LOW LEAKAGE, N-CHANNEL JFET SWITCH < Back J/SST111 Series J111 SERIES LOW LEAKAGE, N-CHANNEL JFET SWITCH The J/SST111 Series Low Leakage, N-Channel JFET Switch is a direct replacement for the Siliconix-Vishay equivalent part. It is ideal for fast switching, low leakage, switching applications. Available in the TO-92 3L RoHS and SOT-23 3L RoHS package, as well as in die from. 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: J111 TO-92 3L RoHS J112 TO-92 3L RoHS J113 TO-92 3L RoHS SST111 SOT-23 3L RoHS SST112 SOT-23 3L RoHS SST113 SOT-23 3L RoHS J111 Die J112 Die J113 Die Datasheet Spice Model Application Notes

2N5114 SERIES LOW ON-RESISTANCE, P-CHANNEL JFET SWITCH < Back 2N5114 Series 2N5114 SERIES LOW ON-RESISTANCE, P-CHANNEL JFET SWITCH The 2N5114 Series Low On-Resistance, P-Channel JFET Switch is a direct replacement for Siliconix-Vishay equivalent part. It is ideal for low resistance, low capacitance switching applications. Available in 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: 2N5114 TO-18 3L RoHS 2N5115 TO-18 3L RoHS 2N5116 TO-18 3L RoHS 2N5114 Die 2N5115 Die 2N5116 Die Datasheet Spice Model Application Notes

TIGHTLY MATCHED, MONOLITHIC DUAL, NPN TRANSISTOR < Back LS3250 Series - Dual TIGHTLY MATCHED, MONOLITHIC DUAL, NPN TRANSISTOR The LS3250 Tightly Matched, Monolithic Dual, NPN Transistor is a Higher Current Version of the MP310, MP311, MP312, and MP313 Series. It is ideal for Higher Current, Small Signal Transistor, 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: LS3250A TO-71 6L RoHS LS3250B TO-71 6L RoHS LS3250C TO-71 6L RoHS LS3250A TO-78 6L RoHS LS3250B TO-78 6L RoHS LS3250C TO-78 6L RoHS LS3250A PDIP 8L RoHS LS3250B PDIP 8L RoHS LS3250C PDIP 8L RoHS LS3250A SOIC 8L RoHS LS3250B SOIC 8L RoHS LS3250C SOIC 8L RoHS LS3250A Die LS3250B Die LS3250C Die Datasheet Spice Model Application Notes

< Back LSJ689 Press Release Linear Systems Mar 17, 2023 Ultra Low Noise P-Channel Dual JFET NEWS RELEASE CONTACT: Linear Integrated Systems, Inc. 510-490-9160 sales@linearsystems.com LINEAR INTEGRATED SYSTEMS ANNOUNCES ULTRA LOW NOISE P-CHANNEL DUAL JFET Fremont, California – June 1, 2016 – Linear Integrated Systems, a leading full-service manufacturer of specialty linear semiconductors, announces the immediate availability of its LSJ689, a 1.8 nV/Hz @ 1kHz, low-capacitance, monolithic dual P-Channel JFET. The LSJ689 serves as the P-Channel complement to the popular monolithic dual N-Channel JFET, the LSK489. This addition to Linear Systems' family of Ultra-Low-Noise JFETs provides designers with expanded options beyond traditional N-Channel JFETs. The monolithic dual construction of the LSJ689 and LSK489 offers superior solutions for tighter Idss (drain-source saturation current) matching and improved thermal tracking compared to using individually matched JFETs. As the availability of P-Channel JFETs has declined, complementary single N-Channel and P-Channel JFETs have become increasingly limited to a few industry standards. In response, Linear Systems developed the LSK170 and LSJ74 families, providing complementary N & P-Channel single JFETs. Now, the LSJ689 and LSK489 monolithic dual JFETs provide further design flexibility, with significantly lower capacitance—4 pF versus the 25 pF of LSK170 and LSJ74. The LSJ689 and LSK489 are well-suited for differential input stages in amplifier, phono, and preamplifier designs. Additional applications include voltage-controlled resistors, thermal stable source followers, sample and hold circuits, and current matched sources. The LSJ689 is available in RoHS-compliant SOT-23 6L, SOIC-A 8L, and TO-71 6L package options. The SOT-23 6L and SOIC-A 8L packages are ideal for space-constrained circuits in audio and instrumentation applications. Key Features: - Complement to the Ultra Low Noise Monolithic Dual N-Channel JFET LSK489 - Ultra Low Noise (typically 1.8 nV/Hz @ 1kHz) - Nearly Zero Popcorn Noise - Idss (drain-source saturation current) matching to 10% max - Low Offset/Tight Matching (|Vgs1 - Vgs2| = 20mV max) - Low Capacitance (Ciss = 4 pF) - High Input Impedance - High Breakdown Voltage (BVGSS = 40V Min) - Monolithic Dual (2 JFETs on one piece of silicon, offering better matching and thermal tracking) - Available in Surface Mount SOIC-A 8L and compact SOT-23 6L packages - Lead-free/RoHS Compliant 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 - Voltage-Controlled Resistors, Sample and Hold, Source Followers Availability: Sampling now in SOIC-A 8L, TO-71 6L, and SOT-23 6L package options. Delivery: Factory Stock About Linear Integrated Systems Founded in 1987, Linear Integrated Systems is a precision semiconductor company providing high-quality discrete components. The company’s expertise is built upon processes and products developed at Amelco, Union Carbide, Intersil, and Micro Power Systems by founder John H. Hall. Hall, a protégé of Silicon Valley legend Dr. Jean Hoerni, previously served as Director of IC Development at Union Carbide, co-founder and Vice President of R&D at Intersil, and founder/president of Micro Power Systems. Linear Systems is a U.S.-based, full-service manufacturer of specialty linear products headquartered in Fremont, California. The company’s small-signal discrete product lines are specifically designed to meet new design and second-source requirements in the audio, hybrid, medical, space, and test and measurement markets. Our product lines include BIFET Amplifiers, Bipolar Transistors, Current Regulating Diodes, JFETs, High-Speed Lateral DMOS Switches, Low Leakage Diodes, and MOSFETs. Linear Integrated Systems provides pin-for-pin replacements for more than 2,000 discrete devices, including those currently offered or previously discontinued by Interfet, Intersil, Micro Power Systems, Motorola, National, Fairchild, Toshiba, and Siliconix-Vishay. Engineers are encouraged to contact Linear Systems for assistance with applications or special testing needs.

TIGHT MATCHING, MONOLITHIC DUAL, PNP TRANSISTOR < 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