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Product Detailed Parameters
- Description：JFET 2N-CH 40V 10MA TO71
- Series：LSK389
- Mfr：Linear Integrated Systems, Inc.
- Package：Bulk
- FET Type：2 N-Channel (Dual)
- Voltage - Breakdown (V(BR)GSS)：40 V
- Drain to Source Voltage (Vdss)：40 V
- Current - Drain (Idss) @ Vds (Vgs=0)：2.6 mA @ 10 V
- Current Drain (Id) - Max：10 mA
- Voltage - Cutoff (VGS off) @ Id：300 mV @ 1 µA
- Input Capacitance (Ciss) (Max) @ Vds：25pF @ 10V
- Resistance - RDS(On)：-
- Power - Max：400 mW
- Operating Temperature：-55°C ~ 150°C (TJ)
- Mounting Type：Through Hole
- Package / Case：TO-71-6 Metal Can
- Supplier Device Package：TO-71
- Grade：-
- Qualification：-
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Overview
The LSK389A TO-71 6L ROHS is an ultra-low noise monolithic dual N-channel JFET amplifier manufactured by Linear Integrated Systems. It features a typical voltage noise of 1.6 nV/√Hz at 1 kHz and 3.2 nV/√Hz at 10 Hz, with a forward transconductance of 20 mS and input capacitance of 25 pF. The device offers a gate-to-source breakdown voltage of 40 V and a saturation drain current range of 2.6 mA to 6.5 mA. Differential gate-to-source cutoff voltage is typically 6.0 mV with a maximum of 15 mV.
Feature Summary
- Monolithic dual construction provides tight matching and thermal tracking between two interleaved JFETs on a single silicon piece.
- Guaranteed elimination of burst (RTN or popcorn) noise through 100% testing for both 1/f and broadband noise specifications.
- High signal-to-noise ratio achieved via low and tightly matched gate threshold voltages.
Applications
- Audio amplifiers and preamps
- Discrete low-noise operational amplifiers
- Battery-operated audio preamps
- Acoustic sensors and sonic imaging
- Hydrophones and sonobuoys
Procurement Notes
Verify the specific grade suffix matches the required IDSS range before ordering. Confirm RoHS compliance status as indicated in the part number. Ensure the package type corresponds to the design requirements. Check for any custom selection codes if tighter noise specifications are needed. Validate that the TO-71 6L package fits the intended footprint.
Selection Notes
Select the LSK389A grade when a lower saturation drain current range of 2.6 mA to 6.5 mA is required. Consider other grades like B, C, or D if higher current capabilities are necessary for the application. The monolithic design simplifies matching compared to discrete components. Verify thermal tracking needs for precision applications.
Part Context
The LSK389 series serves as an improved second-source replacement for the Toshiba 2SK389. It is designed to offer better performance than matching individual JFETs by providing tighter IDSS matching and superior thermal tracking. The series includes four distinct IDSS grades to accommodate various circuit biasing requirements.
Replacement Considerations
The datasheet identifies the LSK389 as an improved second-source replacement for the Toshiba 2SK389. No other specific substitute part numbers are documented in the provided source material.
