ESD静电保护元件
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一、ESD的简介
防静电保护元件,简称ESD。主要用于保护通信接口的静电保护，静电产生原因:
a．两物质经由接触摩擦而失去电子或得到电子，使带（不流动）的电荷称之静电;
b. 因开关电或雷击间接诱发的突波也是静电产生原因;
c. 温湿度影响摩擦生电，在低于45℃时，会产生比高于55℃的湿度下更大的电压，破坏性也相对较大。
国际标准规定,设备必须符合静电标准如下:
IEC 61000-4-2 (ESD) immunity test: Air discharge:土15kV，Contact discharge: ±8kV
IEC61000-4-4 (EFT)* A@(5/50ns)
IEC61000-4-5 (Lightning)* A@ (8/20us)
二、ESD的选型技巧
1. Vrwm大于或等于电路额定工作电压;
2．电容Cp有大有小,以通信接口传输数据不丢包为最佳;
3．功率 Power=Vc*IPP*功率因素，Vc接近Vb为好;
4. Ipp大更好，lpp选择多大决定于产品使用环境;
5．根据喜好选择封装外形、单路或多路。
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| Part Number |
Vrwm(V)
|
Vbr(V)
|
Vc(V)
|
Cj(pF)
|
Ppp(W)
|
Inner Diagram | Data sheet |
|---|---|---|---|---|---|---|---|
| SD3671D3W | 36 | 37 | 60 | 150 | 1600 |
 |
|
| SD4581D3W | 4.5 | 4.7 | 9 | 300 | 1450 |
 |
|
| SD0581D3W | 5 | 6 | 9 | 300 | 1425 |
 |
|
| ESD5Z3L | 3.3 | 4.2 | 9 | 0.6 | 100 |
 |
|
| SDA3.3T1 | 3.3 | 5 | 8.4 | 60 | 200 |
 |
|
| SDA05T1 | 5 | 6 | 11.6 | 80 | 174 |
 |
|
| SDA08T1 | 8 | 8.5 | 13 | 70 | 200 |
 |
|
| SDA12T1 | 12 | 13 | 37 | 52 | 1480 |
 |
|
| SDA15T1 | 15 | 16 | 22 | 35 | 280 |
 |
|
| SDA24T1 | 24 | 25.5 | 38 | 27 | 300 |
 |
|
| SDA36T1 | 36 | 40 | 62 | 20 | 150 |
 |
|
| ESDA33CT | 3.3 | 3.5 | 6 | 10.3 | 90 |
 |
|
| ESDA05CT | 5 | 6 | 8.5 | 12 | 100 |
 |
|
| ESD5Z5CL | 5 | 6 | 9.8 | 0.5 | 200 |
 |
|
| ESDA08CT | 8 | 8.2 | 20 | 30 | 100 |
 |
|
| ESD9D3V3 | 3.3 | 5 | 6.5 | 80 | 102 |
 |
|
| ESD9L5V | 5 | 6 | 9 | 0.9 | 70 |
 |
|
| ESD9D5V | 5 | 6.2 | 7 | 40 | 92 |
 |
|
| ESD9D3V3C | 3.3 | 4.5 | 7.5 | 15 | 100 |
 |
|
| ESD9L5.0C | 5 | 5.4 | 12.9 | 0.5 | 150 |
 |
|
| ESD9D5C | 5 | 5.6 | 11.6 | 15 | 150 |
 |
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| SM8LC03 | 3.3 | 4.5 | 7 | 15 | 800 |
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| SM8LC05 | 5 | 6 | 10 | 15 | 800 |
 |
|
| SM8LC12 | 12 | 13.3 | 19 | 15 | 800 |
 |
|
| SM8LC15 | 15 | 16.7 | 25 | 15 | 800 |
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|
| SM8LC24 | 24 | 26.7 | 40 | 15 | 800 |
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|
| SM8LC36 | 36 | 40 | 53 | 15 | 800 |
 |
|
| LCDA05 | 5 | 6 | 9.8 | 5 | 500 |
 |
|
| LCDA12 | 12 | 13.3 | 19 | 5 | 500 |
 |
|
| LCDA15 | 15 | 16.7 | 24 | 5 | 500 |
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