How should we choose a suitable capacitor for our circuit? The following points should be considered: 

1. Electrostatic capacity;

2. 2. Rated withstand voltage;

3. 3. Capacitance error;

4. 4. The change in capacitance under DC bias;

5. 5. Type of capacitor;

6. 6. Specification of capacitor.

Is there a shortcut to take? In fact, as a peripheral component of a device, the Datasheet or Solutions of almost every device clearly specify the selection parameters of peripheral components, which means that the basic device selection requirements can be obtained and then further refined. 

In fact, when selecting capacitors, it's not just about the capacity and packaging. The specific environment in which the product is used is also crucial. Special circuits require special capacitors.

Below is a classification of chip capacitors based on the dielectric constant of the dielectric, which directly affects the stability of the circuit. 

NP0 or CH (K < 150): 

The electrical performance is the most stable, basically not changing with temperature, voltage and time, suitable for high-frequency circuits with high stability requirements. Given the small value of K, it is difficult to have a large capacity capacitor in the 0402, 0603, and 0805 packages. For example, 0603 generally has a maximum of less than 10nF. 

X7R or YB (2000 < K < 4000): 

The electrical performance is relatively stable, and the performance does not change significantly (ΔC < ±10%) when the temperature, voltage, and time are changed. It is suitable for full-frequency discriminators that require low stability in terms of DC blocking, coupling, bypass, and capacity. 

Y5V or YF (K > 15000): 

The capacity stability is worse than that of X7R (ΔC < +20% ~ -80%), and the capacity and loss are sensitive to test conditions such as temperature and voltage. However, due to its large K value, it is suitable for applications with high capacity requirements. 

Classification of Capacitors 

There are many ways to classify and categorize capacitors, based on their material properties, which can be divided into the following categories: 

Aluminum electrolytic capacitor 

The capacitance range is 0.1μF ～ 22000μF, which is the best choice for high ripple current, long life, and large capacity. It is widely used in power supply filtering, decoupling, and other applications. 

Thin film capacitor 

The capacitance range is 0.1pF to 10μF, with small tolerances, high capacity stability, and extremely low piezoelectric effects, making it the first choice for X and Y safety capacitors and EMI/EMC applications. 

Tantalum capacitor 

The capacitance range is 2.2μF ～ 560μF, with low equivalent series resistance (ESR) and low equivalent series inductance (ESL). Pulsation absorption, transient response, and noise suppression are all superior to aluminum electrolytic capacitors, making it an ideal choice for highly stable power supplies. 

Ceramic capacitor 

The capacitance range is 0.5pF to 100μF, and the unique materials and thin film technology crystallization cater to today's design concept of "lighter, thinner, and more energy-efficient".

Supercapacitors 

The capacitance range is 0.022F to 70F, which is extremely high, so it is also known as "gold capacitor" or "farad capacitor". The main features are: ultra-high capacity, good charge/discharge characteristics, suitable for energy storage and power backup. The disadvantage is that the pressure resistance is low and the working temperature range is narrow. 

About Us

Guangdong Fulong Electronic Technology Co., Ltd. is a private high-tech enterprise specializing in the research and development, manufacturing, and sales of aluminum electrolytic capacitors, certified by IATF16949，ISO9001, ISO14001, and ISO45001. The company has a building area of 17000 square meters and more than 50 automated production lines; The total investment is 50 million yuan (RMB), with more than 100 employees, including more than 20 engineering and technical, quality management, and production management personnel. The annual production of capacitors (4 * 5.4~16 * 21.5) is about 400 million pieces; Our products are mainly sold to domestic and international markets, and we strive to promote our company's products globally.

Jiangxi Fulong Electronic Technology Co., Ltd. is a wholly-owned subsidiary of Guangdong Fulong Electronic Technology Co., Ltd. established in Hukou County, Jiangxi Province with a total investment of 500 million yuan. It has 50 fully automated production lines and an annual output of approximately 1.2 billion capacitors (4 * 5.4~16 * 21.5).

Fulong Group has an international professional core technology research and development team for aluminum electrolytic capacitors and a global sales network. Rich experience in the design, research and development, and production management of aluminum electrolytic capacitors. The R&D team follows the technical design theory of aluminum electrolytic capacitors, complies with international and domestic legal and regulatory requirements (RoHs), and adheres to the highest international quality standards

Fulong Group has high-quality and stable raw material supply partners, and key raw materials (such as aluminum foil, electrolytic paper, etc.) are selected from well-known Japanese and Korean companies (KJCC KDKNKK, etc.), ensuring reliable and stable advantages in product quality, environmental protection, safety, and energy conservation.

Fulong Group has a group of highly qualified professional technicians and management personnel who can produce various series of sheet aluminum electrolysis products according to customer requirements. The products include high-frequency low impedance, low leakage, wide temperature, extremely low impedance, non-polar, ultra long life, medium high voltage long life, high reliability and other new types of special requirements for surface mount products; At the same time, the company's products can withstand a soldering temperature of 260 ℃, meeting the lead-free reflow soldering technology required for SMT in the whole machine factory. All technical indicators of the products have reached or exceeded the international level of similar products.

While strengthening management and expanding operational scale, Fulong Group is also committed to improving its competitiveness and customer satisfaction, continuously and steadily increasing customer and social trust, continuously meeting market demand, further optimizing environmental management and expanding social contributions, and developing together with the electronics industry.

Guangdong Follon Electronic Technology Co., Ltd.

Jiangxi Follon Electronic Technology Co., Ltd.

Address: Building 3, South District, Haishan Science and Technology Park, Hukou County, Jiujiang City, Jiangxi Province

www.follon.com

Professional manufacturer of high-quality surface mount electrolytic capacitors