LSK489B TO-71 6L ROHS

Overview

The LSK489B is a monolithic dual N-Channel JFET amplifier in a TO-71 6L package. It features an input capacitance of 4pF and noise voltage of 1.8nV/√Hz at 1kHz. The B-grade IDSS ranges from 8.0mA to 15.0mA with a typical value of 11.5mA. Differential gate-to-source cutoff voltage is typically 20mV, and common mode rejection ratio reaches 102dB. Gate-to-source breakdown voltage is -60V, while gate-to-gate breakdown is ±45V. Transconductance is 1500µS at 500µA drain current.

Feature Summary

• Monolithic dual construction provides tight differential voltage matching and thermal tracking.
• Low input capacitance significantly reduces intermodulation distortion.
• Ultra-low noise profile with nearly zero popcorn noise characteristics.
• High common mode rejection ratio ensures precision signal processing.

Applications

• Wideband differential amplifiers
• High-speed temperature compensated single-ended input amplifiers
• Sonobuoys and hydrophones
• Acoustic sensors

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact electrical binning and package type. Ensure that the procurement specifications align with the required A or B grade parameters for your design. Confirm RoHS compliance status directly with the supplier or manufacturer before finalizing orders.

Selection Notes

Select this component when low input capacitance is critical to minimize intermodulation distortion in high-frequency circuits. The B-grade IDSS range suits applications requiring higher saturation currents compared to the A-grade variant. Consider the TO-71 package if through-hole mounting is necessary for mechanical stability or thermal management in sensor interfaces.

Part Context

This device belongs to the LSK489 series, which offers industry-leading low input capacitance combined with low noise performance. It serves as a dual-channel alternative to single-channel devices like the LSK189. The TO-71 package version is fit, form, and pin-compatible with the LSK389 product line, allowing for direct interchangeability in existing designs.

Replacement Considerations

The LSK489 TO-71 6L package is fit, form, and pin compatible with the LSK389 product. Designers can use these components interchangeably without modifying the circuit layout. Verify that the specific grade requirements are met by the replacement part.

FAQ

What is the difference between the LSK489A and LSK489B grades?

The primary difference lies in the Drain to Source Saturation Current (IDSS). The LSK489A has an IDSS range of 2.5mA to 8.5mA, while the LSK489B has a higher IDSS range of 8.0mA to 15.0mA.

How does the LSK489 compare to the LSK389 regarding capacitance?

The LSK489 features a much lower gate-to-drain capacitance of 4pF compared to the 25pF found in the LSK389, enabling simpler circuit designs with fewer devices.

Is the LSK489 compatible with other packages?

Yes, the LSK489 is available in surface mount plastic SOIC 8L and SOT-23 6L packages, in addition to the through-hole metal TO-71 6L package.