B41895B5188M

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Aluminum electrolytic capacitors (AECs) are used in a variety of electronic applications as a reliable method of short-term storage, as well as providing instantaneous power. When compared to other types of capacitors, AECs are able to store extremely high levels of energy, as well as having the ability to withstand high levels of voltage. One such example of a popular aluminum electrolytic capacitor is the B41895B5188M.

Applications

The B41895B5188M (B4) is a standard, polarized, snap-in, four-terminal, aluminum electrolytic capacitor designed specifically for various commercial applications such as pulse power supply, decoupling, and filtering. Being a snap-in type, it is ideal for use in PC boards, as well as being suitable for automated assembly. This particular device has an 8000-hour-rated lifetime.

This device has a capacitance range of 0.0047μF to 68μF, operating temperature range of -55°C to +125°C and has a maximum ripple current rating of 10.6Arms. Its ripple current rating means that it is suitable for pulse/switching power supplies, as its capacitance when combined with its associated resistance is able to provide a smooth DC voltage output.

The B4 is also ideal for filtering DC voltage lines for sensitive circuits, as well as providing power to these circuit components when needed. Furthermore, it has a wide variety of uses such as energy storage, DC coupling, and DC blocking.

Working Principle

The B4 uses the electrochemical process of an electrolyte between two layers of aluminum oxide. Basically, it works like two tiny batteries in series, with one positive and one negative terminal. Current starts flowing when the voltage across the terminals is greater than the specified breakdown voltage. This is why AECs are also known as “polarized capacitors” – because the ideal direction of current flow must be specified.

When electrons flow through the terminals, electrons from the negative terminal accumulate at the anode, and electrons from the positive terminal accumulate at the cathode. When the electrons reach the cathode, they will combine with the electrolyte cations, forming a “capacitor” on the surface of the cathode. Furthermore, the electrolyte cations will also move to the anode and form a capacitor on the surface of the anode.

This process occurs continuously and the capacitors formed on the anode and cathode surfaces build up until the voltage across the terminals is equal to the specified breakdown voltage, provided the current is limited. Then the capacitors will begin to discharge as electrons move from the anode to the cathode and the process is repeated.

Ultimately, AECs are designed to handle large voltages and currents, due to their ability to rapidly charge and discharge without significant heating. In practical applications, this makes them ideal for scenarios where large amounts of energy need to be stored or transferred quickly and reliably.

Conclusion

The B41895B5188M aluminum electrolytic capacitor is a reliable, efficient, and often cost-effective choice for conditionally storing high levels of energy in an digital circuit board. Its versatile uses expand beyond just energy storage, and it can also be used to filter, dc couple, and block voltage. The device operates by use of the electrochemical process of an electrolyte between two layers of aluminum oxide and is designed to handle large voltages and currents due to its inability to be damaged when rapidly charging/discharging.

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