DESCRIPTION
The Calogic U421 Series are Dual N-Channel JFETs on a monolithic structure designed specifically for very high input impedance for differential amplification and impedance matching. This series features ultra low input bias current (250 fempto amps, U421) while offering high gain at low operating currents and tight matching characteristics. These devices are available in chip form for hybrid designs as well as a hermetic TO-78 package.

FEATURES
• Ultra Low Input Bias Current . . . . . . . 250 Fempto Amps
• Low Operating Current
• Tight Matching Characteristics

APPLICATIONS
• Ultra Low Leakage FET Input Op Amps
• Electrometer
• Infrared Detectors
• pH Meters