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other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Linear Integrated Systems.

FEATURES 

ULTRA LOW NOISE ( f = 1kHz) 

HIGH BREAKDOWN VOLTAGE  

HIGH GAIN 

HIGH INPUT IMPEDANCE 

LOW CAPACITANCE 

22pF max 

IMPROVED SECOND SOURCE REPLACEMENT FOR 2SK170 

ABSOLUTE MAXIMUM RATINGS 

@ 25°C (unless otherwise noted) 

Maximum Temperatures 

Storage Temperature ‐65°C to +150°C 

Operating Junction Temperature ‐55°C to +135°C 

Maximum Power Dissipation 

Continuous Power Dissipation @ + 125°C 

400mW 

Maximum Currents 

Gate Forward Current 

Maximum Voltages 

Gate to Source 

Gate to Drain 

FOR EQUIVALENT DUAL VERSION, SEE LSK389 

www.micross.com/pdf/LSM_LSK389A_SOIC.pdf    

  

ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)

SYMBOL 

CHARACTERISTICS 

MIN. 

TYP. 

MAX. 

UNITS 

CONDITIONS 

Gate to Source Breakdown Voltage 

40 

‐‐ 

‐‐ 

V 

Gate to Source Pinch‐off Voltage 

0.2 

‐‐ 

2 

V 

Gate to Source Operating Voltage 

‐‐ 

0.5 

‐‐ 

V 

 

Drain to Source 

Saturation 

Current 

2SK170A / LSK170A 

2.6 

‐‐ 

6.5  

mA 

 

 

2SK170B / LSK170B 

6 

‐‐ 

12 

2SK170C / LSK170C 

10 

‐‐ 

20 

Gate Operating Current 

‐‐ 

‐‐ 

0.5 

nA 

Gate to Source Leakage Current 

‐‐ 

‐‐ 

1 

nA 

Full Conduction Transconductance 

‐‐ 

22 

‐‐ 

mS 

Typical Conduction Transconductance 

‐‐ 

10 

‐‐ 

mS 

Noise Voltage 

‐‐ 

0.9 

1.9 

nV/√Hz 

Noise Voltage 

‐‐ 

2.5 

4 

nV/√Hz 

Common Source Input Capacitance 

‐‐ 

20 

‐‐ 

pF 

Common Source Reverse Transfer 

Capacitance 

‐‐ 

5 

‐‐ 

pF 

Notes: 

1. Absolute Maximum ratings are limiting values above which serviceability may be impaired

 

 

 

 

 

LSK170

ULTRA LOW NOISE

LOW CAPACITANCE J-FET

Replace discontinued Toshiba 2SK170 with LSK170

The 2SK170 / LSK170 is a 1nV/√Hz low capacitance JFET

Available Packages:

LSK170 in SOT-23

LSK170 available as bare die

Please contact Micross for full package and die dimensions:

2SK170 / LSK170 Applications:

Audio – Amps, effects boxes, microphones

Instrumentation– Input stages

Acoustic Sensors – Sonobuoys

Military – Antisubmarine, personnel + vehicle

detectors, sonar, radiation detectors…

Optimized to provide low noise at both high and low

capacitance. The 2SK170 / LSK170’s low noise to

provide solutions for low noise applications which

cannot tolerate high values of capacitance or wide

LSK170 promote ease of design tolerancing,

particularly in low voltage applications. The 2SK170 /

LSK170 is ideal for portable battery operated

linear headroom in high transient program content

amplifiers. The 2SK170 / LSK170 series has a uniquely

desirable, particularly for audio front-end preamplifiers.

SOT-23 (Top View)