LSK589 SOIC 8L ROHS

Overview

The LSK589 is a monolithic dual N-channel JFET featuring ultra-low noise and low input capacitance. It provides high transconductance with Gfs ≥ 4000µS at 1kHz. The device exhibits tight matching characteristics, including a differential gate-to-source cutoff voltage of 20mV and a common-mode rejection ratio of 85dB. Electrical parameters include an input noise voltage of 4nV/√Hz at 10kHz and a saturation current (IDSS) ranging from 7.0mA to 40mA. It operates within a junction temperature range of -55°C to +150°C.

Feature Summary

• Ultra-low noise performance suitable for precision signal processing
• Low input capacitance minimizes loading effects on sensitive sources
• High transconductance ensures efficient signal amplification
• Tight differential matching improves accuracy in balanced circuits

Applications

• Precision instrumentation front-ends
• Low-noise audio preamplifiers
• Acoustic sensor interfaces
• High-speed comparators

Procurement Notes

Verify the specific package variant against the datasheet documentation. Confirm that the ordering suffix matches the required physical footprint, as Linear Integrated Systems offers multiple packages including SOIC-8, SOT-23, and TO-71. Ensure the selected component meets the environmental specifications required for the intended operating temperature range.

Selection Notes

Select this component when minimizing input capacitance and noise voltage are critical design constraints. The high transconductance makes it suitable for applications requiring fast settling times. Evaluate the thermal derating requirements if operating above 25°C. Consider the tight matching specifications for differential amplifier configurations where offset voltage stability is essential.

Part Context

Linear Integrated Systems specializes in high-performance discrete semiconductors utilizing proprietary processes. The LSK589 belongs to a family of low-noise JFETs designed for demanding analog applications. This dual configuration allows designers to implement matched pairs without relying on external selection, ensuring consistent performance across both channels.

Replacement Considerations

Public confirmed substitute part numbers: None available.