TVS的简介
瞬态电压抑制二极管，简称TVS。当TVS两极受到反向瞬态高能量冲击时，它能以 10-¹² s的速度，将其两极间的高阻抗变为低阻抗，吸收高达数千瓦的浪涌功率，使两极间的电压钳位于一个预定值，有效地保护电子线路中的精密元器件，免受各种浪涌脉冲的损坏。
TVS的选型技巧
TVS的Vrwm应高出10% 以上的被保护电路的最大直流或连续工作电压、电路的额定标准电压和 “高端”容限。若选用的Vrwm太低，器件可能进入雪崩或因反向漏电流太大影响电路的正常工作。串行连接分电压，并行连接分电流。
TVS的Vc应小于被保护电路的损坏电压。
TVS的功率Ppp应大于被保护电路内可能出现的峰值脉冲功率。
TVS的Ipp应大于电路瞬态浪涌电流。
对于数据接口电路的防雷保护，建议选用低电容的半导体ESD。
根据用途选用TVS的极性及封装结构。交流电路选用双极性TVS较为合理；多线保护选用半导体ESD阵列更为有利。
特点
● Glass passivated chip
● 3000 W peak pulse power capability with a 10/1000us waveform, repetitive rate (duty cycle):0.01 %
● Excellent clamping capability
● Low reverse leakage
● Very fast response time
● Lead and body according with RoHS standard
1. 最大额定值和特性
除另有规定外，额定值为 25℃环境温度
1)Non-repetitive current pulse per Fig.5 and derated above TA= 25 °C per Fig.1；
1. SMB30J 3000W系列产品推荐表
四、直流参考电路图
上海雷卯电子科技有限公司，成立于2011年，品牌Leiditech，是国家高新技术企业。公司研发团队由留美博士和TI原开发经理组建，凭借技术精湛的研发队伍和经验丰富的电磁兼容行业专家，主要提供防静电TVS/ESD以及相关EMC元器件（放电管TSS/GDT、稳压管ZENER、压敏电阻MOV、整流二极管RECTIFIER、自恢复保险丝PPTC、场效应管MOSFET、电感）。
Leiditech围绕EMC电磁兼容服务客户，自建免费实验室为客户测试静电ESD（30KV）、群脉冲EFT(4KV)、浪涌（8/20，10/700 10/1000）、汽车抛负载（7637 5a/5b）和元器件的性能测试等。Leiditech紧跟国内外技术更新脉搏，不断创新EMC保护方案和相关器件，目标方向为小封装，大功率，为国产化替代提供可信赖方案和元器件。
表格信息：
产品信息：Information of TVS
The transient Voltage Suppressor, referred to as TVS, the TVS operates by shunting excess current when the induced voltage exceeds the avalanche breakdown potential. It is a clamping device, suppressing all over voltages above its breakdown voltage. It automatically resets when the overvoltage goes away, but absorbs much more of the transient energy internally than a similarly rated crowbar device.
The selection tips of TVS
1. The Vrwm of TVS should be more than 10% working voltage and tolerance, that protect the Max DC or continuous working voltage of circuits. If the Vrwm is too low, the device will affect the normal work of the circuits because of the snow slide or reverse electric leakage. The current will be divided in the parallel circuit and the voltage will be divided in the serial circuit.
2. The VC of TVS should be less than the damaged voltage of protecting circuits.
3. The Ppp of TVS should be more than the possible peak pulse of protecting circuits.
4. The Ipp of TVS should be more than the surge current of transient circuit.
5. For the lightning protection of data interface circuit, the semiconductor ESD of low capacitance is better.
6. The selection of TVS’ polarity and encapsulation structure should based the application. For the AC circuit, the dual polarity TVS is better, and for the Multi-line protection, the ESD array of semiconductor is better.
