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Solid tantalum capacitor fit for harsh setups

Posted: 01 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:capacitor? automotive? SMD capacitor?

THJ 200C SMD series

AVX Corp. has developed a SMD solid tantalum capacitor that delivers 1,000 hours of continuous operation at 200C with derating.

Designated the THJ 200C SMD series, the tantalum capacitor is based on a unique design, distinct manufacturing processes and special ageing techniques, which guarantees high-temperature performance for a variety of harsh environment applications, such as oil and gas drilling, aerospace, defense and automotive.

The capacitors are initially available in two E-case sizes: E 220?F rated at 10V for 3V rail application at 200C and E 100?F rated at 16V for 5V rail application at 200C. The THJ 200C SMD tantalum capacitors feature a small surface mount package that lends itself to fast pick and place assembly techniques and a negative temperature coefficient that ensures no localized heating occurs in the capacitor, thus avoiding thermal runaway and ultimately destruction or operational degradation of the device.

"As the industry's first SMD solid tantalum capacitors for high temperature applications, these 200C capacitors currently have no direct surface-mount competition and their small size provides significant advantage such as enabling oil drilling heads to be either miniaturized or equipped with advanced features," said Tomas Zednicek, technical marketing manager at AVX. "Furthermore, by eliminating the need for through-hole technology in the end product with the benefits of full automation manufacturers are able to reduce manufacturing costs and increase reliability."

Gold plated termination for hybrid assembly is provided as conventional tin/tin-lead finished terminations have melting points that are too low for reliable operation at 200C. Long operating life is also a key attribute, as the capacitor features a leakage current of less than 1mA after 1000 hours of operation at 200C. All THJ 200C capacitors are designed to withstand a 3x reflow soldering process at 260C and are RoHS compatible.

In oil and gas applications, the THJ 200C SMD tantalum capacitors are designed for use in DC/DC converters found in drilling heads that are subjected to rising ambient temperature with depth. Enabling companies to enhance the use of electronics at higher temperatures leads to higher profits, as deeper

situated commodities are more easily and cheaply accessed. In these applications the 16V capacitor is suitable for 5V analog circuits, while the 10V capacitor is used for 2.5V and 3.3V digital circuits.

Typical aerospace and defense applications include high temperature engine and turbo fan control as well as control and sensing electronics placed near the outer shells of rockets and space shuttles. A key requirement here is reliability under harsh conditions.

Automotive applications require reliability and long life at elevated temperature levels. High capacitance devices rated at 16V are ideal for use in a variety of mechanisms such as in the latest generation of smaller gearboxes and embedded alternators.

Pricing for the THJ Series is set at competitive market levels with a lead time of nine weeks.

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