Multilayer ceramic chip capacitors have the following main features:
Feature:
1, High capacity density:
MLCC can achieve a large capacitance value in a small volume, which is conducive to the miniaturization and integration of electronic devices.
2, High-frequency characteristics:
MLCC can maintain stable performance in high-frequency circuits, reducing signal loss and distortion.
3, Temperature stability:
It has excellent temperature stability and can operate normally within a wide temperature range, adapting to various complex environmental conditions.
4, High reliability:
MLCCs have high reliability and a long service life, which can meet the requirements of long-term stable operation.
5, Low ESR (Equivalent Series Resistance):
This enables MLCC to perform well in circuits, especially in applications that require low power consumption.
6, High temperature and high voltage resistance:
MLCC can operate stably in high-temperature and high-voltage environments, making it suitable for various harsh conditions.
7, Small size:
Due to its multilayer structure, MLCC is relatively small in size and suitable for surface mounting.
The types of multilayer ceramic capacitors (MLCC) mainly include the following categories:
1, Classification based on temperature characteristics:
● A, NP0 and C0G: They have stable temperature characteristics, but their capacitance values are relatively small and their prices are relatively high. They are suitable for high-frequency electronic circuits and resonant circuits with low loss and high stability requirements.
● B, Y5V and Z5U: With relatively large capacitance values and more affordable prices, they are suitable for applications where temperature characteristics are not highly demanding.
● C, X7R and X5R: Located between NP0/C0G and Y5V/Z5U, they are suitable for applications that require larger capacitance values and certain temperature stability.
2. Classification based on material size:
3225, 3216, 2012, 1608, 1005, 0603 and 0402: The larger the number, the wider and thicker the size. Among them, 3225 is the most commonly used size, while 0402 is the smallest type.
3, Classification by application fields:
● Civil MLCC: This includes automotive-grade, industrial-grade, consumer-grade, etc., and is further subdivided into general types, soft terminations, medium and high voltage, flip-chip type, high Q value, microwave and RF, safety standards, open design, three-terminal, array capacitors, etc.
● Military MLCC: Used in military and aerospace fields, it features higher reliability and the ability to withstand extreme environments.
Ceramic Capacitor Manufacturing Process:
The manufacturing of ceramic capacitors (primarily MLCCs – Multilayer Ceramic Capacitors) involves more than ten processing steps, including material preparation, tape casting, electrode printing, lamination, and sintering.
How Are Ceramic Thin Films Prepared?
1. Material Preparation and Ball Milling
Ceramic powders, such as barium titanate (BaTiO₃), are mixed with binders and solvents. The mixture is then ball-milled for 24–48 hours to produce a homogeneous ceramic slurry.
2. Tape Casting
The ceramic slurry is coated onto a PET (polyethylene terephthalate) film and dried to form a ceramic green sheet with a thickness of 1–30 μm (micrometers).
3. Electrode Printing
Using screen-printing technology, electrode patterns made of nickel (Ni) or silver-palladium (Ag-Pd) paste are printed onto the ceramic green sheets.
Lamination, Sintering, and Forming
1. Lamination and Dicing
The ceramic green sheets are stacked in a staggered alignment and laminated into blocks, which are then cut into individual capacitor chips.
2. Binder Burnout and Sintering
The laminated chips first undergo a binder burnout process at a relatively low temperature to remove organic materials. They are then sintered at high temperatures ranging from 1,000°C to 1,300°C. Precise temperature control is essential, as improper sintering can cause the ceramic body to crack or become brittle.
3. Edge Chamfering and Terminal Formation
The chip edges are chamfered to expose the internal electrodes. External electrodes are then applied, followed by nickel and tin electroplating. The nickel layer acts as a diffusion barrier, while the tin layer improves solderability, making the capacitor suitable for reliable PCB assembly.
Final Inspection and Packaging
1. Performance Testing
Every capacitor undergoes 100% electrical testing to verify key performance parameters, including capacitance, dissipation factor (loss), and voltage withstand capability. Components that fail to meet the required specifications are removed from the production line.
2. Tape-and-Reel Packaging
Qualified capacitors are loaded into carrier tape and packaged in tape-and-reel format, then labeled and packed for shipment. This packaging method facilitates automated surface-mount assembly (SMT).
The more refined the manufacturing process, the greater the number of ceramic layers that can be incorporated into the capacitor. This enables higher capacitance, but it also increases manufacturing complexity and production costs.
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