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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.

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FEATURES 

DIRECT REPLACEMENT FOR SILICONIX J204 

LOW CUT OFF VOLTAGE 

HIGH GAIN 

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  

350mW 

MAXIMUM CURRENT

Forward Gate Current (Note 1) 

50mA 

MAXIMUM VOLTAGES 

Gate to Drain Voltage 

Gate to Source Voltage 

  

 

 

J204 ELECTRICAL CHARACTERISTICS @ 25°C (unless otherwise noted)

SYMBOL 

CHARACTERISTIC 

MIN 

TYP. 

MAX 

UNITS 

CONDITIONS 

Gate to Source Breakdown Voltage ‐25 

‐‐ 

‐‐ 

 

V 

IG = 1µA,   VDS = 0V 

Gate to Source Cutoff Voltage ‐0.3 

‐‐ 

‐2 

VDS = 15V, ID = 10nA 

Drain to Source Saturation Current (Note 2) 

0.2 

‐‐ 

3 

mA 

VDS = 15V,  VGS = 0V 

Gate Reverse Current ‐2 

‐‐ 

‐100  

pA 

VGS = ‐20V,  VDS = 0V 

Gate Operating Current 

‐‐ 

‐2 

‐‐ 

VDG = 10V,  ID = 0.1mA 

Drain Cutoff Current 

‐‐ 

 2 

‐‐ 

Forward Transconductance 

0.5 

‐‐ 

‐‐ 

mS 

Input Capacitance 

‐‐ 

4.5 

‐‐ 

pF 

 

Reverse Transfer Capacitance 

‐‐ 

1.3 

‐‐ 

Equivalent Noise Voltage 

‐‐ 

6 

‐‐ 

nV/√Hz 

Micross Components Europe

Available Packages:

J204 in TO-92

J204 in bare die.

Please contact Micross for full

package and die dimensions

Note 1 ‐ Absolute maximum ratings are limiting values above which J204 serviceability may be impaired.  

Note 2 – Pulse test: PW≤ 300 µs, Duty Cycle ≤ 3% 

Tel: +44 1603 788967

TO-92 (Bottom View)

J204

N-CHANNEL JFET

Linear Systems replaces discontinued Siliconix J204

The J204 is a high gain N-Channel JFET

This n-channel JFET is optimised for high gain. The

part is particularly suitable for use in low power or high

impedance amplifiers. The TO-92 package is well

suited for cost sensitive applications and mass

production.

(See Packaging Information).

J204 Applications:

Battery powered amplifiers

Audio Pre-Amplifiers

Infra-Red Detector Amplifiers

J204 Benefits:

High Input Impedance

Low Cutoff Voltage

Low Noise