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电气审图要点大合集(二) [复制链接]

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电气审图要点大合集
电气设计笔记.zip (, 下载次数:13)
本主题由 管理员 xl55xw 于 2011/6/29 20:54:15 执行 设置精华/取消 操作
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村田陶瓷贴片电容知识
品名表示法
片状独石陶瓷电容器
(品名)GR   M   18   8   R7   1C   225   K   E15   D
GRM————表示镀锡电极品(普通贴片陶瓷电容)
       常用的村田电容就是GRM普通贴片陶瓷电容与GNM普通贴片排容。
18    ————表示尺寸(长*宽)(1.6*0.8mm)
        国内通用尺寸表示是(长*宽)1.6*0.8mm(单位为mm).国际上通用尺寸表示是用英寸0603(单位为inch),
       村田的常用代码有03,15,18,21,31,32,42,43,55等,具体的对应值如下:
       03----0.6*0.3mm----0201         15----1.0*0.5mm----0402          18----1.6*0.8mm----0603      
       21----2.0*1.25mm----0805       31----3.2*1.6mm----1206           32----3.2*1.5mm----1210
       42----4.5*2.0mm----1808          43----4.5*3.2mm----1812          55----5.7*5.0mm----2220
  8   ———— 表示厚度(T) (0.8mm)
       常用厚度村田代码有5,6,8,9,B,C,E等,具体的对应值如下:
       5----0.5mm     6----0.6mm     8----0.8mm    9----0.9mm    B----1.25mm    C----1.6mm    E----2.5mm
R7 ————表示材质(X7R)
      常用材质村田代码有5C,R6,R7,F5等,具体的对应值如下:
      5C----COG/NPO/CH       R6----X5R      R7----X7R      F5-----Y5V
      5C工作温度是-55度——+125度,温度系数是0+-30ppm/度;
      R6工作温度是-55度——+85度,温度系数是+-15%;
      R7工作温度是-55度——+125度,温度系数是+-15%;
       F5工作温度是-30度——+85度。温度系数是+22,-82%
      100pf以下小容值的一般采用5C材质,100PF——1uf的一般采用R7材质,1uf以上一般采用R6材质,精度要求不高的一般采用F5材质。材质的选用直接影响到电容值的精度与耐温度情况。
1C ————表示额定电压(DC16V)
       常用电压村田表示有0J,1A,1C,1E,1H等,对应值如下:
      0J------6.3V     1A------10V       1C------16V     1E------25V     1H------50V
225————表示静电容量(22UF)
       由3位字母数字表示,单位为皮法(pF)。第1位和第2位数字为有效数字,第3位数字表示有效数字后的0的个数,有小数点时以大写字母“R”表示,此时所有数字均为有效数字。
       比如:R50表示0.50也就是0.5pF;1R0表示1.0pF;101表示100pF(也就是前2位10为有效数字.第3位1为前面10有效数字后0的个字为1个.也就是100pF)
       1微法(UF)=1000纳法(NF)     1纳法(NF)=1000皮法(pF)    
K   ————表示静电容量允许偏差,也就是常说的档位、精度(+-10%)
       常用档位有B、C、D、J、K、M、Z,具体对应值如下:
       B=+-0.1pF    C=+-0.25pF     D=+-0.5pF   J=+-5%    K=+-10%    M=+-20%    Z=+80,-20%
       正常5C材质的精度可做到B、C、D、J档;R6、R7材质的精度可做到K、M档;F5材质精度是Z档。
E15————个别规格代码(可忽略,不重要)
D  ————包装方式(直径180mm纸带编带盘装)
       常用包装方式有L、D、B等,具体方式如下:
        L表示直径180mm的压纹带(塑料)编带盘装;D表示直径180mm纸带编带盘装;B表示散袋装。
有空再给大家讲村田其它产品的知识。有需要相应规格书或产品的朋友可以联系我。方式如下:
       手机:15017601600   洪舒媚    
       QQ:944265933
       邮件:iawddgui@163.com
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看帖回帖, 是种美德!
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看帖回帖, 是种美德!
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看看 有没有用
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