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Product Detailed Parameters
- Description：JFET N-CH 40V 10MA SOT23-3
- Series：LSK170C
- Mfr：Linear Integrated Systems, Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：40 V
- Drain to Source Voltage (Vdss)：40 V
- Current - Drain (Idss) @ Vds (Vgs=0)：10 mA @ 10 V
- Current Drain (Id) - Max：10 mA
- Voltage - Cutoff (VGS off) @ Id：200 mV @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：20pF @ 15V
- Resistance - RDS(On)：-
- Power - Max：400 mW
- Operating Temperature：-55°C ~ 135°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-236-3, SC-59, SOT-23-3
- Supplier Device Package：SOT-23-3
- Grade：-
- Qualification：-
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Overview
The LSK170C SOT-23 3L ROHS is a single N-channel JFET in an SOT-23 package. It features a Gate to Source Breakdown Voltage (BVGSS) of -40V minimum and Drain to Source Saturation Current (IDSS) ranging from 10.0mA to 20.0mA at VDS=10V, VGS=0. The device provides a typical transconductance (Gfs) of 22mS and exhibits ultra-low noise voltage of 0.9nV/√Hz at 1kHz. Input capacitance is 20pF maximum.
Feature Summary
- Ultra-low noise performance with narrow IDSS range for stable low-noise applications
- High input impedance and high breakdown voltage for linear headroom
- Direct pin-for-pin replacement for Toshiba's 2SK170
Applications
- Audio Amplifiers and Preamps
- Discrete Low-Noise Operational Amplifiers
- Microphones
- Acoustic Sensors
- Electrometers
Procurement Notes
Verify the specific 'LSK170C' grading matches the required 10.0mA to 20.0mA IDSS range for your circuit design. Confirm the SOT-23 3L package orientation and pinout (Drain-Gate-Source) aligns with your PCB footprint. Ensure RoHS compliance requirements are met by checking the ordering suffix. Cross-reference datasheet electrical characteristics against your operating conditions.
Selection Notes
Select this component when designing circuits requiring ultra-low noise at both high and low frequencies. The C-grade offers higher saturation current than A or B grades, suitable for specific biasing needs. Consider the SOT-23 package for compact, embeddable designs where space is critical. Evaluate the trade-off between low capacitance and IDSS stability for your specific application constraints.
Part Context
This part belongs to the LSK170 series of high input impedance, ultra-low noise JFETs manufactured by Linear Integrated Systems. The series includes variants in TO-92, SOT-89, and SOT-23 packages, with different IDSS grades (A, B, C, D). It serves as an improved functional replacement for Interfet devices like IF1320 and IF1330.
Replacement Considerations
Officially documented replacements include Toshiba's 2SK170 (pin-for-pin) and Interfet models IF1320, IF1330, IF1331, and IF4500 (functional). Verify electrical parameter compatibility before substitution.
FAQ
What is the typical noise voltage of the LSK170C at 1kHz?
The typical noise voltage is 0.9nV/√Hz at 1kHz.
Is the LSK170C a direct replacement for the 2SK170?
Yes, it is designed as a direct pin-for-pin replacement for Toshiba's 2SK170.
What is the maximum power dissipation at +25°C?
The continuous power dissipation is 400mW at +25°C.
