The 2N4117A is an Ultra-High Input Impedance N-Channel JFET

The 2N4117A 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

FEATURES
   DIRECT REPLACEMENT FOR SILICONIX 2N4117A
   LOW POWER IDSS<90 µA
   MINIMUM CIRCUIT LOADING IGSS<1 pA

2N4117A 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

2N4117A Applications:
◾ High-Impedance Transducer
◾ Smoke Detector Input
◾ Infrared Detector Amplifier
◾ Precision Test Equipment