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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 2N4119A 

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 

  

 

LS4119A 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 ‐2 

‐‐ 

‐6 

V 

                  VDS = 10V,   ID = 1nA 

Gate to Source Saturation Current 

0.20 

‐‐ 

0.60 

mA 

VDS = 10V,   VGS = 0V 

Gate Leakage Current 

‐‐ 

‐‐ 

‐1 

pA 

VGS = ‐20V,  VDS = 0V 

‐‐ 

‐‐ 

‐2.5 

Forward Transconductance(Note 3) 

100 

‐‐ 

330 

µmho 

 

Output Conductance 

‐‐ 

‐‐ 

10 

Input Capacitance 

‐‐ 

‐‐ 

3  

pF 

 

Reverse Transfer Capacitance 

‐‐ 

‐‐ 

1.5 

  

 

 

 

 

 

  

 

 

 

 

 

 

NOTES 

1 . Absolute maximum ratings are limiting values above which LS4119A 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 LS4119A is an Ultra-High Input Impedance N-Channel JFET

LS4119A

N-CHANNEL JFET

Linear Systems replaces discontinued Siliconix 2N4119A

Micross Components Europe

Tel: +44 1603 788967

Available Packages:

LS4119A in TO-92

LS4119A in bare die.

Please contact Micross for full

package and die dimensions

LS4119A 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 LS4119A provides ultra-high input impedance. The

device is specified with a 1-pA limit and typically

operates at 0.2 pA. The part is ideal for use as a high-

impedance sensitive front-end amplifier.

LS4119A Applications:

High-Impedance Transducer

Smoke Detector Input

Infrared Detector Amplifier

Precision Test Equipment

TO-92 (Bottom View)