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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)：10 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 LSK389C TO-71 6L is an ultra-low noise monolithic dual N-channel JFET amplifier manufactured by Linear Integrated Systems. It features a typical gate-to-source breakdown voltage of -40V and a saturation drain current range of 10mA to 20mA. The device exhibits a typical forward transconductance of 20mS, a typical input capacitance of 25pF, and a typical noise voltage of 1.6nV/√Hz at 1kHz. Maximum power dissipation is rated at 400mW at +25°C.
Feature Summary
- Monolithic dual construction with interleaved JFETs on a single silicon piece for superior matching and thermal tracking
- Guaranteed elimination of burst (RTN or popcorn) noise through 100% testing
- Tight differential gate-to-source cutoff voltage matching with a maximum offset of 15mV
- 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 and sonic imaging
- Sonobuoys and hydrophones
Procurement Notes
Verify the specific grade suffix 'C' corresponds to the required IDSS range of 10mA to 20mA during procurement. Confirm the package designation matches the TO-71 6L through-hole configuration. Ensure the component meets RoHS compliance requirements as specified in the standard part call-out. Cross-reference the datasheet revision A27 for accurate electrical characteristics.
Selection Notes
Select the LSK389C when a saturation drain current between 10mA and 20mA is required. This grade offers high gain and low noise suitable for precision applications. Consider the TO-71 6L package for through-hole implementations requiring industry-standard pinouts. Evaluate the 40V breakdown voltage for headroom needs in high transient program content amplifiers.
Part Context
The LSK389 series serves as an improved second-source replacement for the Toshiba 2SK389. It replaces discrete dual JFET configurations to save cost and eliminate yield loss associated with manual matching. The monolithic design provides tighter IDSS matching and better thermal tracking compared to individual components.
Replacement Considerations
The LSK389 is explicitly documented as an improved second-source replacement for the Toshiba 2SK389. Verify pinout compatibility and electrical specifications against the original component before substitution.
FAQ
Does the LSK389 exhibit popcorn noise?
No, the LSK389 is 100% tested and guaranteed to meet specifications while eliminating burst (RTN or popcorn) noise entirely.
What is the maximum differential gate-to-source cutoff voltage offset?
The maximum differential gate-to-source cutoff voltage offset is 15mV.
How does the monolithic construction benefit performance?
The interleaved dual JFETs on a single silicon piece provide excellent matching and thermal tracking, promoting ease of device tolerance in low voltage applications.
