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Information furnished by Linear Integrated Systems and Micross Components is believed to be accurate and reliable. However, no responsibility is assumed

for its use; nor for any infringement of patents or 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 

DIRECT REPLACEMENT FOR SILICONIX 2N4117 

LOW POWER 

MINIMUM CIRCUIT LOADING 

ABSOLUTE MAXIMUM RATINGS  

@ 25°C (unless otherwise noted) 

Maximum Temperatures 

Storage Temperature ‐65°C to +175°C 

Operating Junction Temperature ‐55°C to +150°C 

Maximum Power Dissipation 

Continuous Power Dissipation  

300mW 

MAXIMUM CURRENT

Gate Current (Note 1) 

50mA 

MAXIMUM VOLTAGES 

Gate to Drain or Gate to Source (Note 2) ‐40V 

  

 

LS4117 ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)

SYMBOL 

CHARACTERISTIC 

MIN 

TYP. 

MAX 

UNITS 

CONDITIONS 

Gate to Source Breakdown Voltage ‐40 

‐‐ 

‐‐ 

V 

IG = ‐1µA,   VDS = 0V 

Gate to Source Cutoff Voltage ‐0.6 

‐‐ 

‐1.8 

V 

                  VDS = 10V,   ID = 1nA 

Gate to Source Saturation Current 

0.03 

‐‐ 

0.09 

mA 

VDS = 10V,   VGS = 0V 

Gate Leakage Current 

‐‐ 

‐‐ 

‐10 

pA 

VGS = ‐20V,  VDS = 0V 

‐‐ 

‐‐ 

‐25 

Forward Transconductance(Note 3) 

70 

‐‐ 

210 

µmho 

 

Output Conductance 

‐‐ 

‐‐ 

3 

Input Capacitance 

‐‐ 

‐‐ 

3 

pF 

Reverse Transfer Capacitance 

‐‐ 

‐‐ 

1.5 

  

 

 

 

 

 

  

 

 

 

 

 

 

NOTES 

1 . Absolute maximum ratings are limiting values above which LS4117 serviceability may be impaired.  

2.  Due to symmetrical geometry, these units may be operated with source and drain leads interchanged 

3. This parameter is measured during a 2ms interval 100ms after power is applied.  (Not a JEDEC condition.) 

The LS4117 is an Ultra-High Input Impedance N-Channel JFET

LS4117

N-CHANNEL JFET

Linear Systems replaces discontinued Siliconix 2N4117

Micross Components Europe

Tel: +44 1603 788967

Available Packages:

LS4117 in SOT-23

LS4117 in bare die.

Please contact Micross for full

package and die dimensions

LS4117 Benefits:

Insignificant Signal Loss/Error Voltage

with High-Impedance Source

Low Power Consumption (Battery)

Maximum Signal Output, Low Noise

High Sensitivity to Low-Level Signals

The LS4117 provides ultra-high input impedance. The

device is specified with a 10-pA limit and is ideal for use

as a high-impedance sensitive front-end amplifier.

LS4117 Applications:

High-Impedance Transducer

Smoke Detector Input

Infrared Detector Amplifier

Precision Test Equipment

SOT-23 (Top View)