ETPF470M5H Capacitors

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Tantalum-polymer capacitors, also known as Ta-polymer capacitors, are an important type of capacitor. Generally, they are fabricated using tantalum powder, carbon (graphite), and an anionic solid polymer as the electrolyte. They are widely used in all kinds of electronic equipment, such as communication and consumer electronic products, consumer and industrial computers, digital and analog control devices, and navigation systems. The main feature of tantalum-polymer capacitors is the extremely small size, and they are currently the smallest type of capacitor available in the market. This makes them ideal for use in space-constrained applications.

The ETFP470M5H is a tantalum-polymer capacitor produced by KEMET, a leader in electronic components. It is a wide use form factor capacitor and available in several variants, with capacitance ranging from 1µF to 470µF, and has a tolerance range of ±20%. ETFP470M5H capacitors are typically used in applications that require high-temperature and mechanically robust capabilities, such as industrial, automotive, and medical systems. These capacitors provide excellent temperature stability, improved ESR, and high ripple current capability.

The primary purpose of a capacitor is to store electric charge. This is done by using a dielectric material, such as tantalum, between two metal plates. When a voltage is applied, the electron charge builds up on the plates, causing a potential difference between them. This potential difference creates a capacitance or “capacitive reactance” that stores energy. The positive and negative plates that store the energy are known as “capacitive plates”.

Tantalum-polymer capacitors have higher capacitance density, extended rated voltage and temperature range, and low ESL/ESR compared to other capacitors. The dielectric material of the ETFP470M5H is a layer of tantalum powder, coated with an anionic solid polymer electrolyte to provide higher charge density, thereby enabling a much smaller footprint size. This combination of reduced size and enhanced performance results in high power density and extended life expectancy, making ETFP470M5H ideal for applications such as power amplifiers and wireless transmitters.

The ETFP470M5H is designed to have high capacitance retention at high temperatures such as 85°C and 105°C, thus making it suitable for industrial, automotive and medical applications. The capacitance retention of the ETFP470M5H is over 90% at 85°C, and over 95% at 105°C. It is rated for a voltage of 2.5V, while the leakage current rating is 0.02CV with a maximum temperature rating of 125°C. The operating voltage range of the capacitor is 0.3V to 2.5V.

The ETFP470M5H also has a wide frequency range, up to 100kHz, making it suitable for high-frequency applications, such as radio frequency (RF) and pulse power applications. The ESR of the capacitor is 0.14Ω at 100kHz and85°C, and its inductance is less than 2nH, making it very suitable for high-frequency applications. Moreover, the capacitor has a very low DC bias temperature coefficient, meaning it can be used in high temperature applications without significant capacitance loss.

In conclusion, the ETFP470M5H is an ideal capacitor for many applications that require space-constrained components and superior performance. It offers high capacitance in a compact form factor, excellent temperature stability and reliability, extended life expectancy, and wide frequency range. Furthermore, the low ESR and inductance of the capacitor make it suitable for high-frequency applications.

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