25TQC22MYFD Capacitors

Operating Temperature:	-55°C ~ 105°C
Features:	General Purpose
Ratings:	--
Manufacturer Size Code:	D2
Lead Spacing:	--
Height - Seated (Max):	0.079" (2.00mm)
Size / Dimension:	0.287" L x 0.169" W (7.30mm x 4.30mm)
Package / Case:	2917 (7343 Metric)
Mounting Type:	Surface Mount
Lifetime @ Temp.:	2000 Hrs @ 105°C
Series:	POSCAP™ TQC
ESR (Equivalent Series Resistance):	60 mOhm
Type:	Molded
Voltage - Rated:	25V
Tolerance:	±20%
Capacitance:	22µF
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

Tantalum-polymer capacitors, also known as polymeric-tantalum capacitors, are a type of electrochemical capacitors. Their main feature is their high capacitance and high-density, making them attractive components in electronic products such as high-end smartphones that require miniaturized components.

History

The development of polymeric-tantalum capacitors began in the 1990s with the aim of creating capacitors with a higher capacitance than standard tantalum capacitors. By 1999, mass production of these capacitors had begun and they quickly gained popularity in the electronics industry. Since then, they have become one of the most widely used types of capacitors.

Construction and working principle

The construction of polymeric-tantalum capacitors consists of a plate made of tantalum, an electrolyte containing a polymer, and two leads. The plate is connected to one of the leads, while the other lead is connected to the electrolyte containing the polymer. The two plates form an electric double layer, which is used to store electrical energy.The working principle of these capacitors is simple. When a voltage is applied to them, the electric field created causes the positively charged ions in the electrolyte to be attracted to the negatively charged plate, while the negatively charged ions are attracted to the positively charged plate. This creates an electric double layer, which is then used to store the electrical energy.

Application fields

The high capacitance and high-density of polymeric-tantalum capacitors make them ideal for use in a wide range of applications, including:

• High-end smartphones
• Personal computers
• Military and aerospace electronics
• Automotive electronics
• High-frequency power supplies
• Medical electronics
• Portable electronic devices
• Telecommunication equipment
• Industrial instrumentation
• Robotics

Advantages

Polymeric-tantalum capacitors have several advantages over other types of electrochemical capacitors:

• They are miniaturized and thus can be used for miniaturized designs
• They have a high capacitance density, which makes them suitable for use in high-frequency applications and high-powered applications
• The electrolyte used in these capacitors is highly stable, increasing the device’s reliability
• They have long lifetimes, with some models rated to last over 10 years

Disadvantages

However, polymeric-tantalum capacitors have some disadvantages as well.

• They are relatively expensive compared to other types of capacitors
• The leakage current of these capacitors is higher than that of other types of capacitors
• The breakdown voltage is relatively low
• They are susceptible to moisture, leading to poor performance in humid environments
• The dissipation factor is higher than other types of capacitors

Conclusion

In conclusion, polymeric-tantalum capacitors are an attractive choice for electronics applications due to their high capacitance, high-density, and miniaturization. The advantages and disadvantages of these capacitors should be taken into consideration when selecting a suitable capacitor for your application.

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