ST’s STPTIC devices form a series of tunable RF capacitors. These tunable capacitors are intended for use in mobile phone applications, dedicated to RF tunable applications.
ST’s STPTIC series features standard capacitor values ranging from 2.7 pF to 8.2 pF. These tunable capacitances are controlled through a bias voltage ranging from 2 to 20 V, with a tuning ratio of 3.5 to 1.
ST’s tunable capacitors are available in flip-chip and micro QFN packages.
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ST’s new range of BST (barium strontium titanate) tunable capacitors in a WLCSP package uses solder bars instead of bumps. In addition to increasing the chip’s mechanical strength when soldered on thin printed circuit boards, the 3-solder bar package is smaller than a 4-bump device, making this new C4 series of Parascan™ tunable integrated capacitors (STPTIC) even more suited for high-volume manufacturing.
There are currently three RF tunable capacitors with solder bars: STPTIC-15C4 and STPTIC-27C4 are high-linearity devices used in frequency-tuning applications and the STPTIC-82C4 with standard linearity is best suited for impedance matching. A common land pattern can be used in order to support passive tunable integrated circuit (PTIC) values ranging from 1.5 to 8.2 pF.