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Product Detailed Parameters
- Description：JFET 2N-CH 40V 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)：-
- Current - Drain (Idss) @ Vds (Vgs=0)：17 mA @ 10 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：300 mV @ 0.1 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 LSK389D is an ultra-low noise monolithic dual N-channel JFET amplifier from Linear Integrated Systems. It features a TO-71 6L package and RoHS compliance. The device provides a drain-to-source saturation current (IDSS) range of 17 to 30 mA with a typical gate threshold offset of 15 mV. Noise voltage is specified at 1.6 nV/√Hz typical at 1 kHz and 3.2 nV/√Hz at 10 Hz. Transconductance is typically 20 mS, with a breakdown voltage of 40 V.
Feature Summary
- Monolithic dual construction interleaving both JFETs on the same silicon for optimal matching
- Guaranteed elimination of burst or popcorn noise through 100% testing
- Tight matching characteristics including low gate threshold offset and high CMRR
- High signal-to-noise ratio resulting from low and tightly matched gate threshold voltages
Applications
- Audio amplifiers and preamps
- Discrete low-noise operational amplifiers
- Battery-operated audio preamps
- Acoustic sensors
- Hydrophones
Procurement Notes
Verify that the specific part number matches the required IDSS grade, as the LSK389 series includes multiple grades (A, B, C, D) differentiated by saturation current ranges. Confirm the package type corresponds to the design requirements, as the component is available in both surface mount SOIC 8L and through-hole TO-71 6L configurations. Ensure compliance with environmental standards such as RoHS if applicable to the manufacturing process.
Selection Notes
Select the LSK389D when a higher drain-to-source saturation current range between 17 and 30 mA is required compared to other series grades. This model offers tight matching and low noise performance suitable for precision applications. Consider the monolithic dual design for improved thermal tracking and ease of tolerance in low voltage applications compared to discrete single JFETs.
Part Context
The LSK389 series represents an industry-leading ultra-low noise dual JFET solution designed for high-end audio and sensor industries. It serves as an improved second source replacement for the 2SK389. The series is available in four IDSS grades, with the LSK389D providing the highest current range among them, ensuring flexibility for various circuit biasing needs while maintaining superior noise performance.
Replacement Considerations
The LSK389D is documented as an improved second source replacement for the 2SK389. For equivalent single N-channel versions, refer to the LSK170 datasheet.
