Multianode tantalum capacitors

25th June 2007

AVX

ES Admin

0 0

New TPM series multi-anode “mirror” configuration multianode tantalum capacitors have been developed by AVX, delivering reduced height, lower self inductance and lower Equivalent Series Resistance. The new symmetrical design reduces ESL to 1nH – half that of standard D case sized devices. Low ESL enables a higher resonant frequency up to 500kHz (mirror D case), delivering more efficient filtering in DC/DC power switching converters. The new design also reduces the height of the new tantalum capacitors from 4.3mm (E case) to 3.1mm (D case) with even further reductions planned, down to 2.0mm maximum height.

Comments Tomas Zednicek, Worldwide Technical Marketing Manager: “Common demands from designers of switch mode power supplies, microprocessors, and general digital circuit applications are the reduction of noise while operating at higher frequencies - together with a downsizing of power supplies. This requires components with low Equivalent Series Resistance (ESR), high capacitance and high reliability. To achieve this, multi-anode internal designs have been used in applications such as telecoms infrastructure, networking, servers and even military/aerospace projects.”

The mirror anode configuration is also better for thermal power dissipation; hence higher ripple current can be achieved using only one capacitor. This allows downsizing of the power supply without compromising the output current ratings.

Multianode mirror tantalums are available as D case devices within AVX’s existing TPM series. Complying with RoHS requirements, TPM capacitors are designed for 3x reflow, 260degC peak temperature lead-free assembly systems, and feature an operating temperature range of between -55degC and +125degC.

Mirror TPM capacitors have a capacitance range of 10 to 1000F, are rated at 2.5 to 50V and have an ESR range of 25-140m. High voltage (35 and 50V) devices will be especially attractive for telecommunication applications where design height is becoming an important parameter: capacitance values 10-22F, ESR 65-140m on a single 35-50V capacitor are difficult to attain within the 3.1mm maximum height using any other technology.