AVX CORP.: Ultra-Miniature, Thin-Film Transmission Line Capacitors
The new capacitors can be supplied on a variety of low-loss substrates, including quartz, alumina, glass, and silicon, and are available in a wide range of capacitance values (0.3-50 pF with a ± 20% tolerance).
AVX Corp. recently introduced a new line of ultra-miniature, thin-film transmission line capacitors for high-frequency links, DC blocking in the UHF range (300MHz - 3GHz), and other high-performance microwave and RF applications. The new capacitors reportedly have a novel metal-insulator-metal (MIM) structure, copper traces for optimal circuit conductivity, a transmission line wire-bond pad, and a gold-metallized backside ground. They can be supplied on a variety of low-loss substrates, including quartz, alumina, glass, and silicon, and are available in a wide range of capacitance values (0.3-50 pF with a ± 20% tolerance). According to AVX, each capacitor is made using a high-frequency structure simulator (HFSS) to proactively address any electromagnetic challenges and provide the highest possible RF performance and reliability.
“Our new thin-film transmission line capacitors are developed using ultra-precise HFSS designs for optimized circuit conductivity and RF performance,” said Larry Eisenberger, principal technical marketing engineer. “They offer a wide range of capacitance values and several customizable features, including impedance values and substrate material and thickness, and are also gold-wire bondable and RoHS compliant, enabling their employment in a broad range of high-performance microwave and RF applications.”
The new transmission line capacitors are available in three standard substrate thicknesses: 5, 10, and 15 mils (0.005, 0.01, 0.015 in.) and two standard substrate widths: 20 and 40 mils (0.02-0.04 in.), and have design-dependent lengths determined by transmission line dimensions. Average lengths are generally in the realm of 20-80 mils (0.02-0.08 in.), but lengths up to and beyond 320 mils (0.32 in.) are not uncommon.
The range is rated for up to 100 V, has specific capacitance values ranging from 50-100 pF/mm2, a dissipation factor of less than 0.1%, and a TCC value of ±60 ppm/°C, and exhibits 50Ω standard impedance; actual maximum capacitance values also depend on transmission line dimensions. Custom impedance values, substrate materials, and substrate thicknesses are available upon request.
The new transmission line capacitors are also RoHS compliant and are tested to MIL-STD-883-2011.8 for bond strength, MIL-STD-883-2018 for shear strength, and MIL-STD-202-108 for lifetime. Packaging options include: antistatic waffle pack, tested but un-diced, and tested and diced on tape.
Additional details are available at www.avx.com.