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Low ESR high rel tantalum capacitors minimize failure rates in long life commercial power supplies

6th March 2008

AVX

ES Admin

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Today's commercial power supply market is acutely aware of the need to minimize the failure rates. This has led to an increased demand for high-reliability low ESR capacitors. In response, for commercial, yet high-rel applications, AVX has introduced a range of new parts within its TRJ professional series which deliver significantly lower ESR while achieving reliability levels twice that of standard tantalum devices.

The launch program is part of AVX’s continuous improvement policy and the result of feedback from customers. One hundred twenty four new parts are now available in the commercial hi-rel (professional) TRJ series with ESR figures reduced down to levels previously only available from specialist low ESR series (TPS) devices. This enables designers of power supplies for use in long life expectancy applications - industrial, automotive, commercial aerospace, medical etc - to use tantalum capacitors with the combined benefits of high reliability (0.5%/1000hrs) and low ESR.

AVX developed its TRJ tantalum capacitor series for use in demanding environments that call for higher performance under electrical and mechanical stress, and the company introduced technical improvements into the production process that strengthen the structure of the capacitor and make it more robust.

There are several key differences between standard tantalum and TRJ products:

Well-tried tantalum powders are used to ensure the long-term stability of electrical performance.

Conservative design rules are followed both in design and manufacturing. Very strict quality controls limits are applied and additional testing is performed. 100% hard surge current screening, extended electrical testing and accelerated burn-in process are used to achieve and verify the high robustness of the parts.

Low ESR TRJ capacitors are especially suitable for filtering in power supply applications where they can significantly contribute to smoother filtering performance and long-term stability. They can help reduce the size of end equipment, help deliver a higher power output within the same instrument size, and contribute to reducing costs by using fewer capacitors in a parallel configuration.

Standard and low ESR TRJ capacitors are available in standard A, B, C, D and E EIA case sizes in voltages ranging from 6.3 to 50V and capacitance values from 0.1 – 470µF. 6.3, 10 and 25V rated voltage parts target the most popular output voltages of DC/DC converters and battery applications (3.3, 5 and 12V).