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 1F=1000000μF Code Capacitance tolerance Code Capacitance tolerance F ± 1pF S + 50%, –20% K ±10% Z + 80%, –20% M ±20% P +**, – 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-+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, 提供了较好的抑制效果。 较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 **稳定 稳定 一般用途 工作温度范围 -55℃~+125℃ -55 ℃~+125 ℃ -10℃~+85 ℃ -30℃~+85℃ 较大容量温度变化率 0±30ppm/℃ ± 15 % -22% ~+56 % -22%~+82% 绝缘电阻 Ri ≥104mΩ Cr ≤ 25nF Ri ≤ 4000MΩ Cr ≤ 25nF Ri* ≤ 100S 损耗( tanб ) Cr>50pF≤0.015 Cr≤50pF≤0.015 (15/Cr+0.7) <0.025 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 进口滤波器螺纹直径对比见下表。