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Product Detailed Parameters
- Description：JFET 2N-CH 60V TO71-6
- Series：LSK489
- Mfr：Linear Integrated Systems, Inc.
- Package：Bag
- FET Type：2 N-Channel (Dual)
- Voltage - Breakdown (V(BR)GSS)：60 V
- Drain to Source Voltage (Vdss)：-
- Current - Drain (Idss) @ Vds (Vgs=0)：2.5 mA @ 15 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：1.5 V @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：8pF @ 15V
- Resistance - RDS(On)：-
- Power - Max：500 mW
- Operating Temperature：-55°C ~ 150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-71-6 Metal Can
- Supplier Device Package：TO-71-6
- Grade：-
- Qualification：-
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Overview
The LSK489A 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 device has a gate-to-source breakdown voltage of -60V and continuous power dissipation of 300mW per side. The A-grade IDSS range is 2.5mA to 8.5mA with a differential cutoff voltage of 8mV typical.
Feature Summary
- Industry's lowest input capacitance for reduced intermodulation distortion
- Monolithic construction providing tight offset voltage matching and thermal tracking
- Ultra-low noise profile with nearly zero popcorn noise
- High common mode rejection ratio
Applications
- Wideband differential amplifiers
- High-speed temperature compensated single-ended input amplifiers
- High-speed comparators
- Impedance converters
- Sonobuoys and hydrophones
- Acoustic sensors
Procurement Notes
Verify the specific grade suffix (A or B) matches the required IDSS range, as the datasheet defines distinct current limits for each. Confirm the TO-71 metal package variant is selected over surface mount options. Ensure the ordering code aligns with the requested electrical tolerances for VGS(off) and delta IDSS.
Selection Notes
Select this component when minimizing gate-to-drain capacitance is critical for circuit stability and linearity. The LSK489 offers a trade-off between slightly higher noise compared to the LSK389 but significantly lower capacitance. Use the A-grade version for tighter differential current matching requirements.
Part Context
This part belongs to the LSK489 series of low-noise dual JFETs from Linear Integrated Systems. It is designed as a high-performance alternative to the LSK389, prioritizing low capacitance over absolute minimum noise. The device is pin-compatible with the LSK389 in TO-71 and SOIC packages.
Replacement Considerations
The LSK389 is a direct fit, form, and pin-compatible substitute available in the same TO-71 package. Designers should account for the LSK389's higher capacitance (25pF) versus the LSK489's 4pF when making substitutions.
