The 2N3958 is a Low Noise, Low Drift, Monolithic Dual N-Channel JFET

The 2N3958 family are matched JFET pairs for differential amplifiers. The 2N3958 family of general purpose JFETs is characterized for low and medium frequency differential amplifiers requiring low offset voltage, drift, noise and capacitance
The 2N3958 family exhibits low capacitance - 6pF max and a spot noise figure of - 0.5dB max. The part offers a superior tracking ability.
The 8 Pin P-DIP and 8 Pin SOIC provide ease of manufacturing, and the symmetrical pinout prevents improper orientation. 

FEATURES
   LOW DRIFT |∆ VGS1‐2 /∆T|= 5µV/°C max.
   LOW LEAKAGE IG = 20pA TYP.
   LOW NOISE en = 10nV/√Hz TYP.

2N3958 Applications:
◾ Wideband Differential Amps
◾ High Input Impedance Amplifiers