穿芯电容
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
101100pF 331330pF 471 470pF
102 1000pF 3323300pF 4724700pF
103 10000pF 33333000pF 47347000pF
1000pF=1nF 1000000pF=1μF 1000nF=1μF 1μF=1000nF=1000000pF 1F=1000000μF
Code |
Capacitancetolerance |
Code |
Capacitancetolerance |
F |
± 1pF |
S |
+ 50%, –20% |
K |
±10% |
Z |
+ 80%, –20% |
M |
±20% |
P |
+100%, – 0% |
二、工作电流Rated Current :
0.06A,0.15A,0.25A,0.3A,0.45A,0.5A,1A,2A,3A,4A,5A,10A,15A,25A,50A,100A
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DielectricWithstandingVoltage :
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WorkingTemperatureRange:
E:-10-+85℃ F:-25-+85℃ G:-30-+125℃
H:-40-+85℃ I:-55-+85℃ J:-55-+125℃
温度特征 |
电容变化 |
温度范围 |
SL |
SL(0±30ppm/°C) |
–25~+ 85°C |
B |
B(+10~ –10%) |
|
D |
D(+20~ –30%) |
|
E |
E(+20~ –55%) |
|
F |
F(+30~ –80%) |
|
C |
CG(+350~ –1000ppm/°C) |
–55~+125°C |
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。
*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 |
-55℃~+125℃ |
-55 ℃~+125 ℃ |
-10℃~+85 ℃ |
-30℃~+85℃ |
|
*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 |