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TECHNOLOGY
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½积和重量,提高产品可靠性。顺应
了
IT
产业小型化、½量化、高性½、多功½的发展方向。
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
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:
l
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½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。
、
l
2
类陶瓷介质
MLCC
具有很高的比½积电容量,适合用于旁路、耦合、滤波以及对容量稳定性要求不高
的鉴频电路。在
DC-DC(AC)变换器和开关电源滤波电路正逐步取代½电解电容器、
铝电解电容器。
MLCC can be divided into two classes:
l
l
Class 1
Dielectrics are used with very high Q and linear temperature coefficient in these
capacitors. They can be distinguished into temperature compensating type and
temperature stable type.
They can be used in such applications as oscillators and filters where low losses, low
capacitance drift or temperature compensation and high stability are required.
Class 2
These capacitors have a very high capacitance per volume and non-linear temperature
characteristics. They are used for by-passing, coupling, filter and de-coupling. For
instance, they can be substituted for the Ta, Al electrolytic capacitors in DC-DC(AC)
converters and switching power suppliers.
¦
MLCC
的制造工艺
将化学组成和微观晶相结构符合设计要求的陶瓷原粉和有机粘合剂进行充分混合成为
陶瓷料浆,通过流延或喷涂等方式制得所需厚度的生坯膜片。在膜片上印刷内电极后进
行叠压、切割成为单个电容器生坯后于
1000℃— 1400℃之间进行多层共烧,在所得瓷
坯两端进行端电极金属化处理后即制成
MLCC
成品。最后经电性½测试和检验合格,
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TECHNOLOGY
即可包装入库,并交付½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
e
r
呈正比,与单层介质厚度
T
呈反比关系。
C = e
r
×
0
×A×n / T
e
额定工½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
The capacitance of a MLCC depends on the area of the electrodes (A), the thickness of the
ceramic dielectric (T) and the dielectric constant of the ceramic material (e
r
) , and the number
of dielectric layers (n) with multi- layer ceramic capacitors:
C = e
r
×
0
×A×n / T
e
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.
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结构与外½尺寸
Structure & Dimension
陶瓷介质
内电极
Ceramic Dielectric
Electrode
锡
Sn
镍
Ni
银/铜
Ag/Cu
L
1
L
2
W
H
L
图
1
片式多层陶瓷电容器外½与内部结构
Figure 1 Dimension and Cross-section of MLCC
尺寸代码
GB/IEC/EIA
(JIS/EIAJ)
0201
(0603)
0402
(1005)
0603
(1608)
0805
(2012)
1206
(3216)
长度
L/mm
0.6±0.03
1.0±0.05
1.6±0.10
½度
W/mm
0.3±0.03
0.5±0.05
0.8±0.10
1.25±0.20
厚度(最小值/最大值) 端头½度(最小值/最大值)
H(Min/Max)/mm
L
1
(Min/Max)/mm
0.27/0.33
0.45/0.55
0.70/0.90
0.75/1.35
0.25/0.75
1.15/1.55
0.10/0.20
0.15/0.35
0.20/0.60
2.0±0.20
1.25
+0.30
-0.10
3.2±0.20
1.6±0.20
0.50/1.80
0.25/0.75
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产品型号规格及代码定义
Part Number System
C
0402 C0G 101
J
500 N T B
产品代码
Product Code
C
表示片式多层陶瓷电容器
MLCC
尺寸规格
Size Type Code
(GB/IEC/EIA 代码)
0201;0402;0603;0805;1206;1210
温度系数或温度特性
T. C.
C0G (NP0):
0±
30ppm/
℃
/0±
60ppm/℃
X7R:
±15%
X5R:
±15%
Y5V:
+22/-82%
标称电容量代码
Capacitance Code
-55
℃
~ +125
℃
-55
℃
~ +125
℃
-55
℃
~ +85
℃
-30
℃
~ +85
℃
表示标称电容量(单½:pF)
,前两½数码为有效数字,后一½数码为
10
的幂数;
½标称电容量小于
10pF
时,以字母
R
表示小数点;
如:
104
=
100000pF;
4R7=4.7pF;0R5=0.5pF;
The capacitance code is expressed in pico-farads and identified by a three-digit
number. The first two digits represent significant figures. The last digit specifies
the number of zeros.
(Example
:
104
=
100000pF;
4R7=4.7pF;0R5=0.5pF;
)
标称电容量的允许偏差代码
Tolerance Code
B:±0.1pF
F:±1%
K:±10%
C:±0.25pF
G:±2%
M:±20%
D:±0.5pF
J:±5%
Z:+80/-20%
额定电压代码
Rate Voltage Code
表示额定电压(单½:V)
,前两½数码为有效数字,后一½数码为
10
的幂数;
6R3=6.3V;100=10V;160=16V;250=25V;500=50V;101=100V
端电极类型
Termination
N
表示
Ag(或 Cu)/Ni/Sn
三层结构(Nickel
Barrier);S
表示全银端头(Silver);
包装代码
Packaging Code
T:纸带包装(7
英寸胶盘)
T: Paper tape reel
180mm (7inch)
H:纸带规格(7
英寸胶盘)
H: Paper tape reel
180mm (7 inch)
P:胶带规格(7
英寸胶盘)
P:
Plastic
tape reel
180mm (7 inch)
A:纸带包装(13
英寸胶盘)
A: Paper tape reel
330mm (13 inch)
E:胶带规格(13
英寸胶盘)
E:
Plastic
tape reel
330mm (13 inch)
B:散包装
B: Brick, Loosed in bag
C:塑料盒散包装
C: Bulk cassette
厚度代码
Thickness Code
表示产品厚度,见产品电容量范围与厚度规格表。对于
0201、0402、0603
等规格只有一种厚度时,该项可以空缺。
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产品范围、尺寸、厚度
Product Range、Size & Thickness
类别
CLASS
T.C.
尺寸规格
SIZE
额定电压
VOLTAG
E
0.47pF
0.56pF
0.68pF
0.82pF
1.0pF
1.2pF
1.5pF
1.8pF
2.2pF
2.7pF
3.3pF
3.9pF
4.7pF
5.6pF
6.8pF
8.2pF
10pF
12pF
15pF
18pF
22pF
27pF
33pF
39pF
47pF
56pF
68pF
82pF
100pF
120pF
150pF
180pF
220pF
270pF
330pF
390pF
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
0201
25
25
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
0402
50
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
25
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
1
类陶瓷介质
MLCC / Class1
C0G (NP0)
0603
50
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
100
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
25
0805
50
100
50
1206
100
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