【技术】半导体放电管的工作原理

时间： 2023-04-21 来源：嘉兴南电官网

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半导体放电管是一种过压保护装置，它是利用晶闸管原理制成的。它依靠PN结的击穿电流触发装置导通放电，可以流过大的浪涌电流或脉冲电流。那么半导体放电管的工作原理是什么？本文嘉兴南电来为大家介绍。

半导体放电管，又称固体放电管，是一种PNP元件，当外加电压低于断电压时，设备处于断开状态；当电压超过其断电峰值电压时，半导体放电管会将瞬态电压钳制在元件的转换电压中；当电压继续增加时，半导体放电管由于负阻效应进入导通状态，此时几乎短路；当外加电压恢复正常时，电流会迅速下降，低于维持电流，元件会自动复位，恢复到高阻抗状态。

它是一种基于可控硅原理和结构的二端负阻装置，用于保护敏感易损的集成电路，避免雷电和突然波动造成的损坏。它采用先进的气力注入技术，具有导通准确、响应快、电涌吸收组能力强、可靠性高的特点；广泛应用于程序控制交换机、电话机、传真机、配线架、XDSL、通信接口、通信发射设备等所有需要防雷保护的领域，以保护内部集成电路免受瞬时过电压的冲击和损坏。

半导体放电管特性参数：

①断电电压VRM和漏电流IRM：断电电压VRM表示半导体过电压保护器不通电的最高电压，该电压下只有少量漏电流IRM。

②破坏电压VBR：通过规定的测试电流IR（一般为1mA）时的电压，表示半导体过压保护器开始通电的标志电压。

③转换电压VBO和转换电流IBO：当电压升高到转换电压VBO时，半导体过压保护器完全通过，呈现小阻抗，两端电压VT立即降至非常低的值（一般在5V左右）。

④峰值脉冲电流IPP：半导体过压保护器能承受的最大脉冲电流。

⑤维持电流IH：半导体过压保护器继续保持导电状态的最小电流。一旦流过的电流小于维持电流IH，就会恢复到截止状态。

⑥静态电容器c：半导体过压保护器静态电容器值。

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WAYON 公司介绍电路保护/功率半导体/IC产品

型号- WP3883CL系列,4030,0603系列,WJ1028-AT,WR0120-AT,2410系列,WP311X,1140,WR00521-AT,WP3883CL,5432系列,0402,4030系列,MLR,WR0115-AT,2718系列,0603,WP311X系列,9550系列,WR0366-AT,WJ1021-AT,5432,1206系列,WR0368-AT,WJ1050-AT,0402系列,WJ1044-AT,9550,WR0322-AT,1140系列,1206,2410,WJ1042-AT,WJ1040-AT,2718,C4 系列,MLR系列

商品及供应商介绍 - WAYON - V1.0 - 2023/7/25 PDF 中文下载

里阳半导体（Liown）汽车行业保护器件选型指南

型号- SMBJ5.0A,SM6S24A,SMCJ440A-Q,2R090MM-8,30KP-Q,SM8S33A,SMBJ6.5A,15KP36A-Q,5KP-Q,SM6S,SMCJ75A-Q,5KP36A-Q,SMBJ6.5CA,15KP-Q,SM8S30A,2R075ML-8,5.0SMDJ36A-Q,561KD20J,LTHXXA-YYBWGH,5.0SMDJ-Q系列,5KP33A-Q,SM8S系列,220KD10,220KD10J,20KP-Q,SMCJXXA,2R090ML-8,5KP24A-Q,SMBJ7.0A,180KD10,15KP30A-Q,5KP系列,5.0SMDJ-Q,SM8S,180KD10J,5.0SMDJ24A-Q,5KP,15KP20A-Q,SMBJ7.0CA,15KP24A-Q,15KPXXA-Q,SMBJ6.0A,SM8S20A,SM8SXXA,SMBJ30CA-Q,2R075MM-8,5.0SMDJ75A-Q,2R800ML-8,SMBJ16CA,SMBJ6.0CA,SM8S24A,SM8S36A,SM6S系列,P6SMAJ33CA-Q,SMBJ5.0CA

选型指南 - 里阳半导体 - 2022年08月 PDF 中文下载