The LS844 is a low-noise Junction Field Effect Transistor (JFET) ideal for precision, high-end audio, sensor and discrete operational amplifier applications. It features a unique design construction of interleaving both JFETs on the same piece of silicon to provide excellent matching and thermal tracking, as well as a low-noise profile having nearly zero popcorn noise and lower intermodulation distortion.
"The release of this high-performance dual JFET at a low price enables design-ins for high-volume production," Linear Systems President Tim McCune says. "Applications ranging from microphones to sensor inputs based on the LS844 will have vastly better signal clarity than circuits based on other options at this price point."
The LS844, Low Noise, Monolithic Dual, N-Channel JFET provides designers with a better-performing solution for obtaining tighter IDSS matching and better thermal tracking than using individual JFETs or non-monolithic dual JFETs. The part is an ideal combination of high transconductance, low noise (2.5nV/√Hz typical at f = 1kHz) and very low input capacitance (3pF typical CISS).
"The LS844 retains all the classical performance of a JFET designed for audio applications while incorporating improvements we learned while developing the industry-leading LSK389," McCune said. "Designers will see familiar curves on the LS844 datasheet and be impressed by its specifications."
Applications for the LS844 include wideband differential amplifiers, high CMMR front ends, temperature compensated single ended input amps, tight tracking current sources, low jitter high speed comparators, impedance converters, acoustic sensors, piezo-based sensors, sensitive charge amplifiers, and much more.
The LS844 is part of Linear Systems' family of low-noise JFETs. The lead parts of this family are the LSK389 dual series and the LSK170 single series ultra-high-performance JFETs. The N-channel dual LSK489 has slightly higher noise than the LSK389 but lower input capacitance than the LSK389. In addition to the LSK and LS series, all Linear Systems' JFET standard products have substantially lower noise than those made by other manufacturers and are marketed under the Improved Standard Products trademark.
The LS844 is now available for $1.19 USD each in quantities of 1,000 pieces in the SOT-23 6L package.
A detailed Datasheet and a valuable application note written by Bob Cordell with circuit examples for pre and power amplifiers, microphone preamps for dynamic and condenser designs, phono preamp, and much more is available from the Linear Systems website here.
Based in Fremont, CA, Linear Systems is a full-service, privately held, 32-year-old US designer and manufacturer of small-signal discrete semiconductors. The company was founded by John H. Hall, co-founder of Intersil and founder of Micro Power Systems. Linear Systems fabricates the LS844 and all its components in Silicon Valley.
www.linearsystems.com
