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TVS二極管也叫瞬態(tài)（瞬變）電壓抑制二極管，當電路中突然出現(xiàn)一個反向的高能量沖擊時，其阻抗會瞬間降低，變成通導(dǎo)狀態(tài)，允許大電流通過，但是把電壓降低到其預(yù)定的水平，保護電路中其它電子元器件收到損壞。TVS二極管分為單向TVS二極管和雙向TVS二極管。
瞬變二極管的主要參數(shù)：
1、擊穿電壓；2、最大反向電流；3、最大反向電壓；4、最大鉗位電壓；5、最大功率；6、電容值；7、漏電流；
在選購TVS二極管時還要注意一下幾點：
1、若TVS二極管有可能受到來自兩個方向的沖擊時，要選用雙向TVS二極管，反之選用單向。
2、TVS的鉗位電壓要低于被保護元器件的最高承受電壓。
3、在正常工作時，TVS二極管最好不要保持被擊穿狀態(tài)。
長電TVS二極管型號表：
| TVS二極管 | PD | VRWM | Min | Max | IR | IT | VC | IPP | 封裝形式 |
| (mW) | (V) | (uA) | (mA) | (V) | (A) | ||||
| CESD12VAP | 12 | 13.3 | 16.5 | 1 | 1 | 24 | 9 | SOT-23 | |
| CESD12VCP | 12 | 13.3 | 16.5 | 1 | 1 | 24 | 9 | SOT-23 | |
| CESD12VD3 | 12 | 13.3 | 16.5 | 1 | 1 | 24 | 9 | SOD-323 | |
| CESD12VD5 | 12 | 14.1 | 16.5 | 1 | 1 | 24 | 9 | SOD-523 | |
| CESD12VD7 | 12 | 13.5 | 16.5 | 1 | 1 | 24 | 9 | SOD-723 | |
| CESD3V3AP | 3.3 | 5 | 5.9 | 10 | 1 | 13 | 16 | SOT-23 | |
| CESD3V3D3 | 3.3 | 5 | 5.9 | 10 | 1 | 13 | 16 | SOD-323 | |
| CESD3V3D5 | 3.3 | 5 | 5.9 | 0.08 | 1 | 13 | 16 | SOD-523 | |
| CESD3V3D7 | 3.3 | 5 | 5.9 | 2.5 | 1 | 13 | 9 | SOD-723 | |
| CESD5V0AP | 5 | 6.2 | 7.3 | 10 | 1 | 13 | 13 | SOT-23 | |
| CESD5V0D1 | 5 | 6.2 | 7.3 | 1 | 1 | 13 | 13 | SOD-123 | |
| CESD5V0D3 | 5 | 6.2 | 7.3 | 10 | 1 | 13 | 13 | SOD-323 | |
| CESD5V0D5 | 5 | 6.2 | 7.3 | 0.08 | 1 | 13 | 13 | SOD-523 | |
| CESD5V0D7 | 5 | 6.2 | 7.3 | 1 | 1 | 13 | 13 | SOD-723 | |
| CESD5V0D9 ＊ | 5 | 6 | 8 | 1 | 1 | 15 | 8 | SOD-923 | |
| CESD5V0J4 | 5 | 6 | 7.2 | 5 | 1 | 12 | 5 | SOT-353 | |
| CESD5V0K5 | 5 | 6 | 7.2 | 5 | 1 | 12 | 5 | SOT-363 | |
| CESD5V0L4 | 5 | 6 | 7.2 | 5 | 1 | 12 | 5 | SOT-553 | |
| CESD5V0M5 | 5 | 6 | 7.2 | 5 | 1 | 12 | 5 | SOT-563 | |
| CESD7V0D5 | 7 | 7.5 | 8.7 | 0.03 | 1 | 15.1 | 10 | SOD-523 | |
| CESD7V0D7 | 7 | 7.5 | 8.7 | 1 | 1 | 15.1 | 10 | SOD-723 | |
| CESDB5V0AT3 | 5 | 5.8 | 8.8 | 1 | 1 | 15 | 8 | SOT-323 | |
| CESDB5V0D3 | 5 | 5.8 | 8.8 | 1 | 1 | 15 | 8 | SOD-323 | |
| CESDB5V0D5 | 5 | 5.8 | 8.8 | 1 | 1 | 14 | 8 | SOD-523 | |
| CESDBLC5V0AP | 5 | 5.8 | 8 | 0.1 | 1 | 10 | 5 | SOT-23 | |
| CESDBLC5V0D3 | 5 | 5.8 | 7.8 | 0.1 | 1 | 10 | 5 | SOD-323 | |
| CESDBLC5V0D5 | 5 | 5.8 | 7.8 | 0.1 | 1 | 10 | 5 | SOD-523 | |
| CESDBLC5V0D7＊ | 5 | 5.8 | 7.8 | 0.1 | 1 | 10 | 5 | SOD-723 | |
| CESDBLC5V0D9 | 5 | 5.8 | 7.8 | 0.1 | 1 | 10 | 5 | SOD-923 | |
| CESDLC3V0J4 | 3 | 5.3 | 5.9 | 1 | 1 | 8 | 2.5 | SOT-353 | |
| CESDLC3V0L4 | 3 | 5.3 | 5.9 | 1 | 1 | 8 | 2.5 | SOT-553 | |
| CESDLC5V0AT7 | 150 | 5 | 6.1 | 7.2 | 0.1 | 1 | 11 | 2 | SOT-723 |
| CESDLC5V0G3 | 5 | 6.1 | 7.2 | 0.055 | 1 | 11 | 2.5 | SOT-143 | |
| CESDLC5V0J4 | 5 | 6 | 7.2 | 1 | 1 | 11 | 2.5 | SOT-353 | |
| CESDLC5V0K5 | 5 | 6.2 | 7.2 | 1 | 1 | 13 | 2.5 | SOT-363 | |
| CESDLC5V0L4 | 5 | 6 | 7.2 | 1 | 1 | 11 | 2.5 | SOT-553 | |
| CESDLC5V0M5 | 5 | 6.2 | 7.2 | 1 | 1 | 13 | 2.5 | SOT-563 | |
| DTESD12VLED02 | 12 | 13.5 | 16.5 | 1 | 1 | 25 | 9 | WBFBP-02C(1.0×0.6×0.5) | |
| DTESD3V3LED02 | 3.3 | 5 | 5.9 | 1 | 1 | 13 | 16 | WBFBP-02C(1.0×0.6×0.5) | |
| DTESD5V0LED02 | 5 | 6.2 | 7.3 | 1 | 1 | 13 | 13 | WBFBP-02C(1.0×0.6×0.5) | |
| DTESD7V0LED02 | 7 | 7.5 | 8.7 | 1 | 1 | 15.1 | 10 | WBFBP-02C(1.0×0.6×0.5) | |
| DTESDB5V0LED02 | 5 | 5.8 | 8.8 | 1 | 1 | 15 | 8 | WBFBP-02C(1.0×0.6×0.5) | |
| DTESDBLC5V0LED02 | 5 | 5.8 | 8 | 0.1 | 1 | 10 | 5 | WBFBP-02C(1.0×0.6×0.5) | |
| ESD12VK4 | 12 | 13.3 | 16.5 | 1 | 1 | 24 | 9 | SOT-23-6L | |
| ESDBKU3V0D3 | - | 3 | 4 | 6 | 20 | 1 | 15.8 | 19 | SOD-323 |
| ESDBKV5V0D3＊ | 5 | 6 | 8 | 1 | 1 | 27 | 30 | SOD-323 | |
| ESDBL3V3F1 | - | 3.3 | 4 | 6 | 0.4 | 1 | 10 | 7 | WBFBP-02C(1.0×0.6×0.5) |
| ESDBL5V0AE1 | 5 | 5.8 | 8 | 0.1 | 1 | 10 | 5 | DFNWB0.6X0.3-2L-B | |
| ESDBL5V0F2 | - | 5 | 5.8 | 8 | 0.1 | 1 | 12.5 | 5 | WBFBP-03E |
| ESDBL5V0Y1 | 5 | 5.8 | 8 | 0.1 | 1 | 10 | 4 | WBFBP-02C-A(1.0×0.6×0.5) | |
| ESDBP5V0D3＊ | 5 | 6 | 8 | 1 | 1 | 25 | 30 | SOD-323 | |
| ESDBVD5V0AE1 | 5 | 5.6 | 8 | 1 | 1 | 13 | 4 | DFNWB0.6X0.3-2L-B | |
| ESDBVD5V0D5 | - | 5 | 5.6 | 8 | 1 | 1 | 13 | 4 | SOD-523 |
| ESDBVD5V0F1 | 5 | 5.6 | 8 | 1 | 1 | 13 | 4 | WBFBP-02C(1.0×0.6×0.5) | |
| ESDBVD5V0F2 | 5 | 5.6 | 8 | 1 | 1 | 13 | 4 | WBFBP-03E | |
| ESDBVD5V0Y1 | - | 5 | 5.6 | 8 | 1 | 1 | 13 | 4 | WBFBP-02C-A(1.0×0.6×0.5) |
| ESDLJ12VD9 | - | 12 | 13.3 | 16.5 | 1 | 1 | 25 | 2 | SOD-923 |
| ESDLJ12VY1 | - | 12 | 13.3 | 16.5 | 1 | 1 | 25 | 2 | WBFBP-02C-A(1.0×0.6×0.5) |
| ESDU5V0AG4B | - | 5 | 6 | - | 1 | 1 | 20 | 2.5 | DFNWB2.5×1-10L-B(P0.50T0.50/0.60) |
| ESDU5V0C2 | - | 5 | 6 | - | 1 | 1 | 25 | 3.5 | SOT-23 |
| ESDU5V0D9 | 5 | 5.4 | 9.4 | 1 | 1 | 10 | 1 | SOD-923 | |
| ESDU5V0F1 | 5 | 5.4 | 9.4 | 1 | 1 | 10 | 1 | WBFBP-02C(1.0×0.6×0.5) | |
| ESDU5V0G3 | 5 | 6 | 1 | 1 | 25 | 3.5 | SOT-143 | ||
| ESDU5V0H4 | - | 5 | 6.5 | 8.8 | 1 | 1 | 25 | 5 | SOT-23-6L |
| ESDU5V0K4 | - | 5 | 6.5 | 8.8 | 1 | 1 | 25 | 5 | SOT-363 |
| ESDU5V0N2 | 5 | 6 | 1 | 1 | 25 | 3.5 | SOT-563 | ||
| ESDU5V0N4 | - | 5 | 6.5 | 8.8 | 1 | 1 | 25 | 5 | SOT-563 |
| ESDU5V0Y1 | - | 5 | 5.4 | 9.4 | 1 | 1 | 10 | 1 | WBFBP-02C-A(1.0×0.6×0.5) |
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