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
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.