50 mF wet-tantalum capacitors challenge aqueous supercapacitors

December 17, 2014 // By Graham Prophet
AVX has developed a series of high CV wet tantalum capacitors that approach the ultra high volumetric capacitance densities of aqueous supercapacitors, as well as overcoming their temperature and soldering limitations.

Developed using a design process based on high CV tantalum powders, the TWD DCUltraMax Series High CV Wet Tantalum Capacitors achieve extremely high DC capacitance values: unlike aqueous supercapacitors they are rated for continuous high temperature operation to at least +85°C and are compatible with both wave and reflow soldering to a PCB.

Currently available with a CV value of 50 mF at 6.3V, (units of milliFarads: 50,000 µF) TWD DCUltraMax Series capacitors are suited for use in a variety of harsh environment applications, including: pulse applications, energy harvesting, energy storage, military electronics, and avionics.

Rated for use in temperatures spanning -55°C to +85°C, capacitance and voltage values for the series span 50 mF to 150 mF and 6.3V to 2.5V, respectively. However, series extensions exhibiting CV values of 150 mF at 2.5V and rated for maximum operating temperatures as high as 105C are currently in development. In addition to high CV, TWD DCUltraMax Series capacitors also exhibit a low DCL (DC leakage current) of 0.0001CV, do not require derating, and are available with lead-free or SnPb terminations. Packaged in a DSCC T4 case (AVX's E case), the series measures 26.97 mm in length and 9.52 mm in diameter without an insulating sleeve or 10.31 mm in diameter with an insulating sleeve. The terminal welded to each case measures 57.15 mm.

AVX; www.avx.com/docs/Catalogs/twd.pdf