M551B348M008AH

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Tantalum capacitors are a type of electrolytic capacitor. They are constructed from two layers of conductive material separated by a dielectric material in between. Typically, the conductive layers are formed from an anode and a cathode which is separated by a dielectric layer made of tantalum. The electrodes are connected by tantalum wire which can be treated with a special finish or coating to increase their lifespan and performance.

The M551B348M008AH is a surface mount, conformally coated tantalum-polymer capacitor. It is a very low profile, high-density capacitor with an operating voltage of 25 VDC and a capacitance of 0.47uF. It is particularly suited for applications which require a small size and excellent high-frequency filtering performance. These include signal line decoupling, power supply applications, and EMI/RFI filtering.

Tantalum-polymer capacitors offer several major advantages compared to wet tantalum capacitors such as higher volumetric efficiency, improved reliability, better temperature stability, and lower capacitance drift. The ability to use a conformal coating improves their ability to handle environmental conditions such as temperature and humidity. Additionally, the polymer dielectric used in this type of capacitor increases the reliability of the part and eliminates the need for a special storage or storage/retrieval system like on tantalum wet electrolitics.

The working principle of the M551B348M008AH relies on the fact that when a potential difference is applied across two electrodes separated by a dielectric, an electric field is created which results in a charge being stored on the electrodes. This charge builds up to a point where the potential difference across the electrodes reaches a certain level, at which point no further charge storage can occur. This is known as the capacitance of the device.

In addition to its voltage rating of 25 VDC, the M551B348M008AH also has a capacitance of 0.47uF. This means that it is able to store 0.47 microfarads of charge for every volt of applied voltage. This value is determined by the size of the capacitor and the type of dielectric material used.

The M551B348M008AH is typically used in applications which require a very small size and excellent high-frequency filtering performance. However, it can also be used for other applications such as low frequency bypass and high frequency signal filtering. It is also commonly used in power supplies and voltage regulation circuits, due to its excellent temperature stability and high capacitance drift resistance.

In conclusion, the M551B348M008AH is a very small and efficient surface mount, conformally coated, tantalum-polymer capacitor. Its small size and excellent high-frequency filtering performance make it particularly suitable for applications involving signal line decoupling, power supplies, and EMI/RFI filtering. The working principle of the part relies on the charge stored on the two electrodes of the device when a potential difference is applied across them.

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