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Product Detailed Parameters
- Description：JFET 2N-CH 60V SOT23-6
- Series：LSK489
- Mfr：Linear Integrated Systems, Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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：Surface Mount
- Package / Case：SOT-23-6
- Supplier Device Package：SOT-23-6
- Grade：-
- Qualification：-
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Overview
The LSK489 is a monolithic dual N-Channel JFET amplifier featuring industry-low input capacitance and low noise. It offers an input capacitance of 4pF and a noise voltage of 1.8nV/√Hz at 1kHz. The device provides high CMRR of 102dB and tight differential matching with VGS offset of 8mV typ. Available in SOT-23 6L, it supports continuous power dissipation of 300mW per side and operates within -55°C to +150°C junction temperature.
Feature Summary
- Monolithic dual construction providing excellent thermal tracking and matching
- Ultra-low common source input capacitance reduces intermodulation distortion
- Low noise profile with nearly zero popcorn noise characteristics
- Tight differential voltage match and low drift over temperature range
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 (A or B) required for your application, as IDSS ranges differ between grades. Confirm the SOT-23 6L package availability matches your PCB footprint requirements. Ensure operating conditions stay within the absolute maximum ratings for gate-source and drain-source voltages to maintain reliability.
Selection Notes
Select the LSK489 when low input capacitance is critical to minimize intermodulation distortion compared to higher capacitance alternatives like the LSK389. Choose Grade A for tighter IDSS matching if precise current balancing is needed. Consider the SOT-23 package for surface mount designs requiring compact footprints while maintaining dual-JFET performance.
Part Context
The LSK489 serves as a low-capacitance alternative to the LSK389, offering significantly lower gate-to-drain capacitance (4pF vs 25pF). While slightly noisier than the LSK389, its low capacitance enables simpler circuit designs. It shares pin compatibility with the LSK389 in TO-71 and SOIC packages, facilitating design upgrades.
Replacement Considerations
The LSK389 is a compatible replacement in TO-71 and SOIC packages due to identical fit, form, and pinout. Note that the LSK389 has higher capacitance (25pF) but lower noise. For single-channel equivalents, refer to the LSK189 datasheet.
