M39006/21-0340

Tantalum Capacitors

Tantalum capacitors are extremely popular for their ability to offer higher capacitance values and much greater stability than standard electrolytic capacitors. They are mostly used in micro-electronic circuitry and are typically found in digital electronics, high-power RF applications, and power supplies. The M39006/21-0340 is a tantalum capacitor that has a specific application field and has a specific working principle.

Application Field

The M39006/21-0340 is designed to serve as an input filter and transient suppressor for a system’s power supply, such as on board computers, portable audio and video devices, digital cellular phones, and digital cameras. The capacitor is intended for high temperature, high-reliability applications with a board operating temperature of up to 160°C and a thermal shock of up to 200°C. It can withstand up to 100V reverse voltage and provides circuit designers with a low ESR and high capacitance range.

Working Principle

Tantalum capacitors, such as the M39006/21-0340, are constructed using manganese dioxide or a polymer electrolyte. When a voltage is applied to the capacitor, electrons start to flow from the anode terminal to the cathode, creating an electric field that causes the manganese dioxide to form a thin layer of oxide. This oxide layer is very thin and allows for a very high capacitance value. Additionally, this process is self-regulating, meaning that the capacitance remains stable over time and even with extreme temperatures.

In order to construct the capacitor, terminals are added to the top of the tantalum bead and a layer of electrolyte is placed over the outside of the bead. The electrolyte and the oxide layer interact with each other to form a semiconductor diode, creating a capacitor with good voltage holding and low ESR (equivalent series resistance). This makes the capacitor ideal for blocking high power spikes and filtering out high frequency noise.

Conclusion

The M39006/21-0340 is a tantalum capacitor that is perfect for high-power RF applications and power supplies. Its small size and high capacitance range make it well-suited for portable consumer electronics, such as digital cameras, cellular phones, and laptops. Its sturdy construction and semiconductor diode ensure that it can withstand a wide range of temperatures and voltage. Finally, its low ESR and high capacitance make it a great option for noise filtering and suppressing high power spikes.