High-K dielectric allows reduced sizes for 50V, space-qualified capacitors

March 19, 2015 // By Graham Prophet
The DLI brand of Knowles Capacitors is extending its ‘UX’ Ultra-High K dielectric capacitor range; the ‘UX’ material has the highest dielectric constant of any of DLI’s materials and allows for higher capacitance values in existing case sizes, or smaller sized components.

More compact devices are achieved, the company says, without sacrificing performance; the material is space qualified to MIL-PRF-38534 Class K. This 50V rated dielectric complements the existing 25V rated material and can be specified across DLI’s range of standard Thin Film architectures - including Di-Caps, Border Caps, Bar Caps and Gap Caps. With the temperature stability of an X7R material and a dielectric constant of 25,000 UX is suitable for ultra-broadband decoupling, broadband DC blocking, amplifier stabilisation and energy storage applications.

Full specification is: Capacitance Range 51 pF to 10,000 pF; Temperature coefficient of capacitance ±15% @ -55°C to +125°C; Dissipation Factor < 2.5% @ 1 MHz; Insulation Resistance >103 MΩ @ +25°C and Dielectric Withstanding Voltage of 250% of rated voltage. Finished products can be epoxy and wire bond assembled.

Knowles Capacitors; www.knowlescapacitors.com