SURFACE MOUNT MIS CAPACITORS IN SOD 323 PACKAGE FEATURES * Dual insulating layer (Nitride-Oxide) for maximum reliability * Low Loss, typically 0.04 dB in a 50 Ohm system * Very low temperature coefficient TYPES * MC2 (50 Volt series) DESCRIPTION MIS (Metal-Insulating Layer-Silicon) Capacitors are devices which have very high Q and small size for use in microwave hybrid circuit applications. The dielectric layer is composed of a thermally grown silicon dioxide over which a thicker layer of silicon nitride is deposited. This layer is carried out to the edge of the chip. The end result is a capacitor having a thin, high breakdown dielectric resulting in a high capacitance per unit area. This dual insulating layer exhibits a low temperature coefficient, very high insulation resistance and much lower insertion loss at microwave frequencies than porcelain capacitors. These MIS devices (sometimes referred to as MNOS) exhibit long term stability under bias conditions at high temperatures. MIS CAPACITORS ELEC. SPECS. @ 25C Part Number VR Min. (V) CT @ 0 V Typ. (pF) SMCAP1005 50 0.5 SMCAP1001 50 1.0 SMCAP1002 50 2.0 SMCAP1004 50 4.0 SMCAP1006 50 6.8 SMCAP1010 50 10.0 APPLICATIONS SMCAP1020 50 20.0 MIS Capacitors provide much improved performance over other types of ceramic capacitors in hybrid microwave circuits. They provide low loss in supply decoupling circuits and GaAs FET transistor source bypass (providing more gain per stage). They can also be used as tuning elements in various filters and matching networks. These capacitors provide DC isolation and a tuning or bypass capacitor to ground. Switch and comb generator performance is significantly improved using MIS capacitors. There are no resonance problems associated with MIS devices. SMCAP5040 50 40.0 SMCAP5100 50 100.0 TEMPERATURE DATA OF CAPACITORS Silicon versus ceramic, 50 pF, 20 x 20 mil Chip 10 Percent change from 25C 5 0 -5 -10 -15 -20 -60 -40 -20 0 20 40 Temperature in C 60 80 100 Metelics ATC D. Labs 975 Stewart Drive * Sunnyvale, CA 94O86 * 4O8.737.8181 * FAX: 4O8.733.7645 * www.metelics.com * sales@metelics.com