一、 标称容量Capacitance :
10pF,65pF,100pF,470pF,500pF,1000pF,1200pF,1500pF,1750pF,2000pF,2500pF,2700pF,
3000pF,3300pF,4700pF,5000pF,5500pF,6800pF,7000pF,9000pF,10000pF,0.01μF,0.012μF,
0.015μF,0.018μF,0.022μF,0.025μF,0.027μF,0.028μF,0.045μF,0.050μF,
0.056μF,0.075μF,0.08μF,0.1μF,0.15μF,0.21μF,0.3μF,0.75μF,0.8μF,1μF,
0.015μF,0.060μF,0.062μF,0.150μF,0.200μF,0.250μF,0.250μF,0.300μF,0.450μF,0.500μF,
0.7μF,0.750μF,0.990μF,1.0μF,1.2μF,1.4μF,1.5μF,2.1μF,2.8μF,
4.0μF,5.2μF
101 100pF 331 330pF 471 470pF
102 1000pF 332 3300pF 472 4700pF
103 10000pF 333 33000pF 473 47000pF
1000pF=1nF 1000000pF=1μF 1000nF=1μF 1μF=1000nF=1000000pF
Code |
Capacitance tolerance |
Code |
Capacitance tolerance |
F |
± 1pF |
S |
+ 50%, –20% |
K |
±10% |
Z |
+ 80%, –20% |
M |
±20% |
P |
+100%, – 0% |
二、工作电流Rated Current :
三、额定电压Rated Voltage :
直流:5V,28V,35V,50V,60V,70V,80V,100V,150V,200V,250V,275V
300V,330V,350V,400V,450V,500V,600V,750V,1250V,2500V
交流:70V,85V,90V,115V,125V,140V,200V,220V,230V,240V,330V,350V
四、耐电压Dielectric Withstanding Voltage :
直流:额定电压的2.5倍 交流:额定电压的6倍的直流电压
五、工作温度Working Temperature Range:
E:-10-+
H:-40-+
温度特征 |
电容变化 |
温度范围 |
SL |
SL(0±30ppm/°C) |
–25~+ |
B |
B(+10~ –10%) |
|
D |
D(+20~ –30%) |
|
E |
E(+20~ –55%) |
|
F |
F(+30~ –80%) |
|
C |
CG(+350~ –1000ppm/°C) |
–55~+ |
R |
R(+15~ –15%) |
六、EMI 滤波器的构成
滤波电容
滤波器所用的电容一般为陶瓷电容。由于其物理结构,这种陶瓷电容又称为穿心式电容。
穿心式电容自电感较普通电容小得多,故而自谐振频率很高。同时,穿心式设计,也有效
地防止了高频信号从输入端直接耦合到输出端。这种低通高阻的组合,在 1GHz 频率范围内,
提供了极好的抑制效果。
最简单的穿心结构是由内外电极和陶瓷构成的一个( C 型)或两个电容( Pi 型)。
这种电容的容量可从 10pF ,工作电压可达 2000VDC 。管式穿心电容因为其同轴性,即使在
10GHz 频率,也不会产生明显的自谐振。
穿心电容的介质为陶瓷介质,而陶瓷电容的容量会随环境温度变化而变化,这种容量变化
会影响滤波器的滤波截止率。陶瓷电容的容量温度变化率是由陶瓷介质本身决定的。因此,
选择适当的陶瓷介质非常重要。常见陶瓷介质及其容量温度变化率如下:
EIA 介质类别 |
COG(NP0) |
X7R |
Z5U |
Y5V |
|
超稳定 |
稳定 |
一般用途 |
|||
工作温度范围 |
|
|
|
|
|
最大容量温度变化率 |
0±30ppm/℃ |
± 15 % |
-22% ~+56 % |
-22%~+82% |
|
绝缘电阻 Ri |
≥104mΩ |
Cr ≤ 25nF Ri ≤ 4000MΩ |
|||
损耗( tanб ) |
Cr>50pF≤0.015 |
<0.025 |
<0.030 |
0.050 |
|
介质强度 |
工作电压 200V 500V >1KV |
施加工作电压的倍数(加压时间 5 秒,充电电流 50max ) |
|||
X2.5 |
X2.5 |
X2.5 |
X2.5 |
||
X1.5 |
X1.5 |
X1.5 |
— |
||
X1.5 |
X125 |
— |
— |
||
老化率10进对数时间 |
0 |
1 % |
6 % |
6 % |
滤波电感
滤波电感一般采用铁氧体材料,它可以方便地与穿心电容组合起来,形成复合滤波器,
在高性能滤波器中,也采用线绕电感。但需注意,铁氧材料在大电流下会发生磁饱和,
降低滤波器效能。
七、安装方式Filter Installation Style :
H:焊接式Solder-in Style Filters I:螺栓式 Screw Threaded Style Filters
八、螺纹直径公制范围Thread Size :
M3,M4,M5,M6,M8,M9
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