Myrtle Beach, S.C. AVX Corp. has introduced two series of capacitors that improve audio performance. The niobium oxide capacitors combine non-burn features and low-failure rates to enhance safety, reliability and performance in high-end audio applications such as flight audio systems, while the tantalum capacitors deliver high capacitance/voltage (C/V) values in a small package for space-constrained applications.
The NOJ OxiCap niobium oxide capacitor series (C case size, 220 μF/4 V) may be designed into audio applications for handheld equipment and entertainment systems. A COTS+ version is also under development for military radio applications. OxiCap capacitors provide a high volumetric efficiency, and unlike aluminum devices, they do not suffer from dry out, which typically occurs at continuous operating temperatures above 40°C.
In addition, with a mean time between failure (MTBF) rating between 200,000 to 500,000 hours, the OxiCap is said to perform 100 times better than aluminum electrolytic capacitors. "OxiCap also offers better stability of electrical parameters over time with a smaller variation of electrical parameters over temperature," said Dan Lane, AVX marketing manager, in a statement.
For space and height-constrained applications requiring high-capacitance devices, AVX also offers the TLC series of tantalum capacitors in a T case that offer a capacitance of 220 μF, and a rated voltage of 4 V. With a maximum height of 1.2 mm, the T case is ideal for slim portable devices such as PDAs, mobile phones, and other handheld equipment.
Lane said tantalum is often preferred to ceramic in audio applications since high capacitance/voltage (CV) MLCC capacitors have an associated piezo-electric effect, causing noise at audio frequencies. "Tantalum and niobium oxide capacitors exhibit high-capacitance stability when temperature and DC voltage fluctuate making them ideal for low and middle frequency coupling," stated Lane.
The audio tantalum and niobium oxide capacitors also deliver high capacitance values in small packages and provide noiseless clear filtering to eliminate the piezo effect associated with other dielectrics. Both types are capable of withstanding three times reflow profile up to 260°C, and are manufactured and tested to comply with the latest lead-free, RoHS, and JEDEC 020C requirements.
AVX tantalum and Oxicap capacitors (220 μf, 4 volt) are priced at $0.20 to $0.30 in quantities of 10,000. Delivery is from stock to eight weeks.
AVX, 1-843-448-9411, www.avx.com
Editor's note: For more information on audio systems, technologies and components, visit Audio DesignLine.
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