M39003/09-2071/TR

Operating Temperature:	-55°C ~ 125°C
Failure Rate:	B (0.1%)
Features:	Military
Manufacturer Size Code:	C
Lead Spacing:	--
Height - Seated (Max):	--
Size / Dimension:	0.289" Dia x 0.686" L (7.34mm x 17.42mm)
Package / Case:	Axial
Mounting Type:	Through Hole
Lifetime @ Temp.:	--
Series:	Military, MIL-PRF-39003/9, CSR21
ESR (Equivalent Series Resistance):	250 mOhm
Type:	Hermetically Sealed
Voltage - Rated:	50V
Tolerance:	±5%
Capacitance:	8.2µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Tantalum Capacitors

Tantalum capacitors are widely used to meet the demands of high performance, high reliability and low leakage in numerous applications. The M39003/09-2071/TR is designed to operate at a rated voltage of 25 volts and a temperature range from -55°C to +125°C. It is a radial leaded surface-mount tantalum capacitor with a solid electrolyte providing a high capacitance per unit volume.

Application Field

Tantalum capacitors are used in a variety of applications. They are commonly used in analog and digital circuits as bypass capacitors for supply line decoupling, storage for energy flow, and coupling for AC signal filtering. They are also used in automotive applications, such as anti-lock brakes, climate control, and airbags. Additionally, tantalum capacitors are used in telecommunications devices, alarm systems, medical equipment, metering devices, and many other electronic components.

Working Principle

Tantalum capacitors work by exploiting an electrostatic effect. A layer of tantalum pentoxide is deposited onto a tantalum metal base. This forms a dielectric layer between two electrodes, creating two equal and opposite charges on each side. When a voltage is applied to the two electrodes, a potential difference is created, and electric field-induced charges accumulate and are stored as an electrostatic field in the dielectric layer. This stored energy can be released when the voltage is removed. The capacitance of a tantalum capacitor is determined by the thickness and dielectric constant of the dielectric layer as well as the area occupied by the electrodes.

Types of Tantalum Capacitors

Tantalum capacitors come in a variety of types, each with their own respective advantages and disadvantages. The most common type is the solid tantalum capacitor, which is highly reliable and has a low leakage current. Another popular type is the wet tantalum capacitor, which has a higher capacitance and tolerance for higher temperatures, but is more expensive and prone to failure. Tantalum capacitors are also available in radial and axial leaded configurations. Radial leaded configurations feature two identical leads extending from the body of the capacitor, while axial leaded capacitors usually feature two different-sized leads sawn off from the body. Axial leaded configurations are more compact and require less clearance than radial leaded configurations, but are more difficult to solder.

Advantages of Tantalum Capacitors

Tantalum capacitors have many advantages when compared to other types of capacitors. They have a very small size and weight-to-capacitance ratio, making them highly effective in applications where board space and device size is at a premium. Tantalum capacitors also have a high reliability, with an extended life than other types, and a low leakage current, making them ideal for applications requiring long-time reliability. Additionally, they have a low equivalent series resistance, meaning they are capable of withstanding higher ripple currents.

Disadvantages of Tantalum Capacitors

Though tantalum capacitors are effective in many applications, they do have some drawbacks. The biggest disadvantage is that they are much more expensive than aluminum or ceramic capacitors. Additionally, if they are subjected to an overvoltage, they may be damaged and must be replaced. Lastly, their capacitance and voltage rating can change slightly over time or under certain operating conditions.

Conclusion

The M39003/09-2071/TR is a high-reliability, low-leakage tantalum capacitor specifically designed for a temperature range of -55°C to +125°C. It has a rated voltage of 25 volts and is available in radial and axial leaded configurations. Tantalum capacitors have many advantages over other capacitor types, such as a small size, high performance, and high reliability, but come at a higher price. They are widely used in applications such as signal filtering, decoupling, and energy storage.

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