原创 电阻电容 、封装、容值基本知识总结

                        电阻电容知识总结<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

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1、钽电容的封装尺寸

长的话是+-0.2 ,宽是+-0.1 高 （MM）
A 型的尺寸3.2 X1.6 X1.6 俗称: A(3216)
B型的尺寸 3.5 X2.8 X1.9 俗称: B(3528)
C型的尺寸 6.0X 3.2X 2.6 俗称: C(6032)
D 型的尺寸7.3 X4.3 X2.9 俗称: D(7343) 厚度2.9英寸
E 型的尺寸7.3 X4.3 X4.1 俗称: E(7343) 厚度4.1英寸
V 型的尺寸7.3X 6.1 X3.45 俗称: V(7361)
J(1608)
P(2012)也就是0805的

2、贴片阻排

我只用过一种，就是长乘宽为3.2mm×1.6mm的，上面有四个电阻，管脚之间的尺寸为0.8mm

3、无极性贴片电容

封装尺寸与功率有关 通常来说

封装 功率   封装尺寸

0201 1/20W  1.0x0.5 mm

0402 1/16W  1.6x0.8

0603 1/10W  2.0x1.2

0805 1/8W   3.2x1.6

1206 1/4W   3.2x2.5

1210 1/3W   4.5x3.2

1812 1/2W   5.0x2.5

2010 3/4W   5.6x6.5

2512 1W    6.5x3.2

通过贴片电阻的额定功率和标称阻值，就能算出电阻的额定电压。使用贴片电阻时，不能超过这个额定电压，否则会降低其可靠性；也不能超过其最大工作电压，否则有击穿的危险。

电压=√功率x电阻值 (P=V2 /R) 或最大工作电压两者中的较小值

电容目前我国采用的固定式标称容量系列是：E24，E12,E6系列。他们分别使用的允许偏差是+-5% +-10% +-20%。容量一般从零点几pF到几十uF

　　E24  E12  E6  E24  E12  E6

　　1.0  1.0   1.0  3.3   3.3   3.3

　　1.1             3.6

　　1.2  1.2        3.9   3.9

　　1.3             4.3

　　1.5  1.5   1.5  4.7   4.7   4.7

　　1.6             5.1

　　1.8  1.8        5.6   5.6

　　2.0             6.2

　　2.2  2.2   2.2  6.8   6.8   6.8

　　2.4             7.5

　　2.7  2.7        8.2   8.2

3.0             9.1

4、贴片电阻

贴片电阻的封装与功率关系如下表：

封装       

英制(inch)  公制(mm)    常规功率系列  提升功率系列  最大工作电压      

0201        0603        1/20W        /            25

0402        1005        1/16W        /            50

0603        1608        1/16W        1/10W        50

0805        2012        1/10W        1/8W        150

1206        3216        1/8W        1/4W         200

1210        3225        1/4W        1/3W         200

1812        4832        1/2W        /             200

2010        5025        1/2W        3/4W         200

2512        6432        1W        /              200

电阻阻值

E6, E12, E24, E48, E96, E192

Problem:
What do the terms E6, E12, E24, E48, E96, and E192 mean?

Solution:
The "E" portion of the terms stand for "exponential spacing", and the number is the number of logarithmic steps per decade (power of ten). Early in the 20th century, when electronics was still in the tube era, resistor and capacitor manufacturers adopted this system of standard component values. It is based on the tolerance of the part. If a manufacturer makes a component with a ± 10% tolerance, it makes sense to make the next component value 20% higher. In this way, component values do not overlap. Some comments on each series:

• 
  
• E3 Not used any more.
  
  
• E6 Corresponds to 20% tolerance, seldom used anymore.
  
  
• E12 Corresponds to 10% tolerance, declining in popularity.
  
  
• E24 Corresponds to 5% tolerance, also used for 2% tolerance.
  
  
• E48 Sometimes used by resistor manufacturers who want to prioritize their production, or companies who want to control costs.
  
  
• E96 Corresponds to 1% tolerance.
  
  
• E192 Sequence used for 0.5%, 0.25%, 0.1% and higher tolerance resistors.

There is are no E384 or other sequences.

Standard resistor values occur within decades, and are repeated in decade.

e6[6] = { 1.0, 1.5, 2.2, 3.3, 4.7, 6.8 }; e12[12] = {1.0, 1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8, 8.2 }; e24[24] = {1.0, 1.1, 1.2, 1.3, 1.5, 1.6, 1.8, 2.0, 2.2, 2.4, 2.7, 3.0, 3.3, 3.6, 3.9, 4.3, 4.7, 5.1, 5.6, 6.2, 6.8, 7.5, 8.2, 9.1 }; e96[96] = {1.00, 1.02, 1.05, 1.07, 1.10, 1.13, 1.15, 1.18, 1.21, 1.24, 1.27, 1.30, 1.33, 1.37, 1.40, 1.43, 1.47, 1.50, 1.54, 1.58, 1.62, 1.65, 1.69, 1.74, 1.78, 1.82, 1.87, 1.91, 1.96, 2.00, 2.05, 2.10, 2.15, 2.21, 2.26, 2.32, 2.37, 2.43, 2.49, 2.55, 2.61, 2.67, 2.74, 2.80, 2.87, 2.94, 3.01, 3.09, 3.16, 3.24, 3.32, 3.40, 3.48, 3.57, 3.65, 3.74, 3.83, 3.92, 4.02, 4.12, 4.22, 4.32, 4.42, 4.53, 4.64, 4.75, 4.87, 4.99, 5.11, 5.23, 5.36, 5.49, 5.62, 5.76, 5.90, 6.04, 6.19, 6.34, 6.49, 6.65, 6.81, 6.98, 7.15, 7.32, 7.50, 7.68, 7.87, 8.06, 8.25, 8.45, 8.66, 8.87, 9.09, 9.31, 9.53, 9.76 };

E系列补充说明：

　　E系列也是一种由几何级数构成的数列。E系列首先在英国的电工工业中应用，故采用Electricity的第一个字母E标志这一系列，它是以⁶√10  、¹²√10 、²⁴√10 为公比的几何级数，分别称为E6系列、E12系列和E24系列。（基本值见下表）。即：

E6系列的公比为 ⁶√10≈1.5

E12系列的公比¹²√10≈1.21

E24系列的公比为²⁴√10≈1.1