▉ MLCC 的分类： 根据所采用陶瓷介质材料的类型，MLCC 可划分为两大类： 1 类陶瓷介质 MLCC 具有极高的稳定性，其电容量几乎不随时间、交流信号、外加直流偏压的变 化而改变，同时具有极低介质损耗，即高 Q 值。适用于对容量精度和应用频 率要求较高的谐振电路。根据电容量的温度系数又可分为温度稳定型与温度 补偿型两种。、 2 类陶瓷介质 MLCC
C = εr×ε0×A×n / T
The rated voltage depends on the structure of the device, the thickness and strength of the dielectric Figure 1 shows the structure of a multi-layer capacitor.
General Introduction Multi-layer ceramic chip capacitor is a kind of ceramic dielectric capacitor with small size, high capacitance per volume, high accuracy, suited surface mounted technology (SMT). It is widely used in electronic circuitry, mounted printed circuit board, and hybrid IC. These different functions require specific capacitor properties.
MLCC 片式多层陶瓷电容器工艺 技术(doc 35 页)
简介 Brief Introduction
▉ MLCC 简介： 片式多层陶瓷电容器（MLCC）是适合于表面贴装技术（SMT）的小尺寸、
高比容、高精度陶瓷介质电容器，可贴装于印刷线路板（PCB）、混合集成电 路（HIC）基片，有效地缩小电子信息终端产品（尤其是便携式产品）的体积 和重量，提高产品可靠性。顺应了 IT 产业小型化、轻量化、高性能、多功能 的发展方向。
结构与外形尺寸 Structure & Dimension
陶瓷介质Ceramic
内电极
EDlieeclec
锡 镍 银Sn
/Nit铜rtoirdc
Ag/Cu e
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L1 W
L
2
H
L
图 1 片式多层陶瓷电容器外形与内部结构 Figure 1 Dimension and Cross-section ofTECHNOLOGY DEVELOPMENT CO ., ,LTD
（1005） 5
5
0603 （1608）
1.6±0.1 0.8±0.1
0.70/0.90
0
0
0.20/0.60
1.25±0. 0.75/1.35
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品。最后经电性能测试和检验合格，即可包装入库，并交付使用。 Manufacture process of MLCC
Ceramic powders, which formulation and crystal phase fitted the demand of designing, are carefully mixed with solvent and binder, and then finely milled as slurry. The very thin green sheets can be obtained by casting or spraying the slurry. After this, electrode is printed on the sheets which then be stacked, pressed and cut into chips. The green chip is co-fired at temperatures between 1000 and 1400℃ to become a monolithic block. The final product can be formed by metalizing the termination of the compact ceramic chip.
█ MLCC 的结构 MLCC 的电容量与内电极交叠面积 A、介质层数 n 和陶瓷介质材料的相对介电 常数 εr 呈正比，与单层介质厚度 T 呈反比关系。
C = εr×ε0×A×n / T
额定工作电压主要依赖于介质材料抗电强度、介质厚度以及电容器的结构设 计。 如图 1 所示。 Structure of MLCC
尺寸代码
GB/IEC/EI 长度
A L/mm
（ JIS/EIA
J）
宽度 W/mm
厚度（最小值/最 端头宽度（最小值/
大值）
最大值）
H（Min/Max）/mm L1（Min/Max）/mm
0201 （0603）
0.6±0.0 0.3±0.0
0.27/0.33
3
3
0.10/0.20
0402
1.0±0.0 0.5±0.0 0.45/0.55
The capacitance of a MLCC depends on the area of the electrodes (A),
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the thickness of the ceramic dielectric (T) and the dielectric constant of the ceramic material (εr) , and the number of dielectric layers (n) with multi-layer ceramic capacitors: