2N4118A-E3 [Siliconix]

Ultra-high input impedance JFETs with low leakage (0.2 pA typical), low noise, and high sensitivity to low-level signals. Available in TO-206AF (TO-72), TO-226AA (TO-92), and TO-236 (SOT-23) packages. Suitable for high-impedance transducer amplifiers, smoke detectors, infrared detectors, and precision test equipment.