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)
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Vbr(V)
|
Vc(V)
|
Cj(pF)
|
Ppp(W)
|
Inner Diagram | Data sheet |
|---|---|---|---|---|---|---|---|
| SD4501P4-3 | 4.5 | 5 | 10 | 2800 | 5500 |
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|
| SD0701P4-3 | 7 | 7.5 | 10 | 1000 | 6000 |
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|
| SD1201P4-3 | 12 | 13 | 22 | 1500 | 5400 |
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|
| LC0504N | 5 | 6 | 10 | 0.8 | 100 |
 |
|
| SDA33CP10 | 3.3 | 4 | 7.5 | 4.5 | 200 |
 |
|
| SDA05CP10 | 5 | 6 | 9.8 | 4.5 | 200 |
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|
| SDA08CP10 | 8 | 8 | 14 | 3.5 | 200 |
 |
|
| ULC0524P | 5 | 6 | 9.8 | 0.3 | 75 |
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|
| ULC0544P10 | 5 | 6 | 9.8 | 0.45 | 60 |
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|
| ULC3304P10 | 3.3 | 4.2 | 10 | 0.45 | 60 |
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| ULC0504P10 | 5 | 6 | 9.8 | 0.5 | 100 |
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| ULC0804P10 | 8 | 8.5 | 14 | 0.5 | 100 |
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| ULC052510BP10 | 5 | 6 | 18 | 0.1 | 50 |
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|
| EM2376K | 5 | 6 | 8.5 | 260 |
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||
| LC2504P8 | 2.5 | 2.7 | 4.5 | 3 | 450 |
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|
| LC3304P8 | 3.3 | 3.8 | 5.5 | 3.8 | 450 |
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|
| EM6401M | 5 | 6 | - | 34 | 260 |
 |
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| LC0534N | 5 | 6 | 12 | 0.6 | 90 |
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| LC3374N | 3.3 | 3.5 | 5.5 | 2.5 | 1000 |
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|
| ULC0506N | 5 | 6 | 8.5 | 0.35 | 150 |
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| EM2378K | 5 | 6 | 8.5 | 260 |
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||
| ULC0568K | 5 | 6 | 12 | 0.3 | 100 |
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| ULC0568M | 5 | 6 | 9.8 | 1 | 150 |
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| ULC3306MB | 3.3 | 4.5 | 7 | 0.5 | 50 |
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| ULC0544M | 5 | 6 | 12 | 0.6 | 100 |
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| ULC0504M | 5 | 6 | 12 | 1.5 | 100 |
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| LC0518MA | 5 | 6 | 12 | 0.6 | 100 |
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| SMDA05C-8 | 5 | 6 | 9.8 | 350 | 300 |
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|
| SMDA12C-8 | 12 | 13.3 | 19 | 120 | 300 |
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|
| SMDA15C-8 | 15 | 16.7 | 24 | 75 | 300 |
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