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Polymer tantalum cap delivers higher voltage

Greenville, S.C. — Kemet Corp. says it has launched the industry's first 35-V rated surface-mount polymer tantalum chip capacitor. To date, these devices have been most commonly used in 14 V (or less) applications and are limited to voltage applications that do not exceed 20 V of continuous duty, said Kemet.

Due to advancements in materials and manufacturing processes, Kemet has qualified the first polymer tantalum capacitors suitable for applications of up to 28 V of continuous duty. In addition, these devices have demonstrated surge voltage handling capabilities in excess of 46 V. This increase in voltage rating now provides designers working with higher-voltage applications, such as 24-V and 28-V power input rails with the option of incorporating polymer tantalum technology into new designs.

Designated as the T521 series, the initial offering includes the low-profile V case size (7.3 x 4.3 x 1.9 mm) with a capacitance rating of 15 uF and maximum equivalent series resistance (ESR) rating of 100 milliohms. Future releases will include higher case heights (7.3 x 4.3 x 3.0 mm) with target capacitance values of 22 uF and 33 uF as well as smaller footprints (3.5 x 2.8 x 2.0 mm) targeting application voltages of 6.8 uF and less.

The T521 devices are rated to 125°C. Recommended deratings for the T521 series include a 20% voltage derating for optimal reliability. For applications exceeding 105°C, an additional temperature derating is also recommended. Above 105°C, the voltage should be linearly derated to 2/3 the rated voltage for operation at 125°C. said Kemet.

The T521 series is RoHS compliant and meets the 260°C reflow temperatures for three passes. It is rated at moisture sensitivity Level 3.

Availability: Sample quantities are available. Mass production quantities will be available during the first quarter of 2008.

Kemet Corp. , www.kemet.com

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