U421

N-Channel Dual JFET CORPORATION U421 – U426 FEATURES 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. ORDERING INFORMATION Part Package Temperature Range U421-U426 TO-78 Hermetic Package -55oC to +150oC XU421-U426 Sorted Chips in Carriers -55oC to +150oC Ultra Low Input Bias Current . . . . . . . 250 Fempto Amps Low Operating Current Tight Matching Characteristics Low Leakage FET Input Op Amps Ultra Electrometer Infrared Detectors pH Meters APPLICATIONS PIN CONFIGURATION TO-78 1 2 3 4 5 6 7 SOURCE 1 DRAIN 1 GATE 1 CASE/BODY SOURCE 2 DRAIN 2 GATE 2 4 5 3 2 1 6 7 BOTTOM VIEW C S2 G1 D2 D1 G2 S1 CJ4 U421 – U426 CORPORATION ABSOLUTE MAXIMUM RATINGS (TA = 25oC unless otherwise noted) Gate-to-Gate Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . ±40V Gate-Drain or Gate-Source Voltage . . . . . . . . . . . . . . . . -40V Gate Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Device Dissipation (Each Side), TA = 25oC (Derate 3.2 mW/ oC to 150oC) . . . . . . . . . . . . . . 400mW ELECTRICAL (25oC Unless otherwise noted...