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一 电阻(Resistor):
SMT 电阻一般而言, 其常用之外型尺寸有以下数种规格:
Generally, the SMT resistor dimension of common using is following 3 types:
| 项目 (Item) |
尺 寸 (Dimension) |
| 公制(mm) |
英制(inch) |
| 1 |
1.6mmx0.8mm(1608) |
0.06in.x0.03in.(0603) |
| 2 |
2.0mmx1.25mm(2125) |
0.08in.x0.05in.(0805) |
| 3 |
3.2mmx1.6mm(3216) |
0.12in.x0.06in.(1206) |
注:公制与英制间之单位换算会有些许误差, 且各家厂商之产品间亦有少许差异, 因此上述之尺寸数据为概略值。There will be little of bias when we converse mm to inch. Different vendor will make little of dimension. Above table is estimate dimension.
SMT 电阻的阻值可直接由电阻上之数字计算出来:
The resistor value can be read by marking on resistor surface:
(1) 一般电阻: 其阻值以3码标示。单位为奥姆(ohm; Ω), 以下为例: Normal resistor: Using 3 digital to represent resistor value:
*若电阻标示为203, 则其阻值之计算方式为
If the digital is “203”, then the resistor value is:
20x103 = 20000 ohm = 20K ohm
*若电阻标示为351, 则其阻值之计算方式为
If the digital is “351”, then the resistor value is:
35x101 = 35 ohm
*若电阻标示为050, 则其阻值之计算方式为
If the digital is “050”, then the resistor value is:
05x100 = 5 ohm
(2) 精密电阻: 其阻值以4码标示。单位为奥姆(ohm; Ω), 以下为例:
Precise resistor: Using 4 digital to represent resistor value:
若电阻标示为1203, 则其阻值之计算方式为:
If the digital is “1203”, then the resistor value is:
120x103 = 120000 ohm = 120K ohm
若电阻标示为1301, 则其阻值之计算方式为:
If the digital is “1301”, then the resistor value is:
130x101 = 130 ohm
若电阻标示为0500, 则其阻值之计算方式为:
If the digital is “0050”, then the resistor value is:
050x100 = 50 ohm
(3) 0 奥姆电阻, 其阻值之标示为0:
0 ohm is represented as below:
(4) 电阻标示中若有”R”, 表示阻值中有小数点:
Letter “R” means dot as below:
5R6 = 5.6 ohm | 
