【应用】PPTC和TVS应用于RS-485接口过流和浪涌保护，有效防止电路损坏

时间： 2021-12-25 来源：电安科技

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目前RS-485接口在工业产品的数据通讯上应用比较广泛。在实际应用中，接口传输线通常暴露于户外，因此极易因为干扰、电压不稳、负载短路、安装接线错误、雷击等原因引入过电压、过电流等损坏接口电路。一旦过压引入，就会击穿损坏。在有强烈的浪涌能量出现时，甚至可以看到收发器爆裂，线路板焦糊的现象。

因此过流保护和浪涌保护在设计中是必须要考虑的。通常使用自恢复保险丝和TVS来保护电路。如下图所示，

当有过电流或雷击事件发生时，产生的过电流、过电压由A/B线引入，经过GDT、自恢复保险丝和，TVS到电路内部。GDT作为初级共模防护，通常GDT可以承受10KA(8x20us)浪涌冲击。之后残压已经大大降低到1KV以下，然后TVS管作为二级保护，充当共模/差模保护，使收发器的电压被钳制在12V以下，实现对收发器的过流和浪涌保护。

通常，对于4KV以下过电压，可以省去初级保护—GDT。单用TVS就能实现浪涌保护的要求。一般TVS可选用电安科技的TVSSMBJ6.5CA、SMCJ6.5CA，视浪涌能力而定。当RS485总线安装错误或与电力线搭接短路时。A/B线上的自恢复保险丝可以提供短路保护，及时切断回路，以防止进一步损坏电路。PTC选1206到2920之间的封装，电流100mA以下即可。

TVS外形和电气参数如下图：

SMBJ6.5CA电气参数

SMCJ6.5CA电气参数

PPTC外形和电气参数如下图：

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本文由香菜脆脆鲨转载自电安科技，原文标题为:电安PPTC和TVS在RS-485接口过流和浪涌保护中的应用，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。

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选型表 - 电安科技立即选型

S16C03-8 THRU S16C24-8 TVS ARRAY SERIES Data Sheet

型号- S16C03-8TR,S16C05-8,S16C15-8,S16C03-8,S16C24-8,S16C12-8,S16C24-8TR

2019/5/8 - SMC - 数据手册 - Rev. B 代理服务技术支持现货查询批量订货

【选型】竞沃(TLC) 过流保护产品(PPTC/FUSE/ESD/CSR/TVS)选型指南（简版）

目录- PPTC自恢复保险丝产品一次性保险丝产品 Power TVS与ESD半导体静电抑制器 ESD静电抑制器与电流感测电阻CSR TLC产品应用领域

型号- 04 100,06 110,SMDJXXA,SMBJXXA,0402,PC01,PSMD 0805,HV610,LMMT0,12 100,HFM0,TLV SERIES,HV110.PV,PTN102H05B,TAL SERIES,06 100,USML1210,TD SERIES,LCT0,LSMD 2920,PTN102U05B,HET0,HV620,SMDJXXCA,BEV7,BEV5,PSML0805,TRB SERIES,TRA SERIES,TRE SERIES,HEET0,USMD 1210,PB01,FSML0603,HV510,HV630,HV110,MSMD1812,PTN205U05A,TLS SERIES,62720,EV1845,TRF SERIES,10800,ESDAC05,NSMD1206,HV520,SMFXXCA,12110,TVS SERIES,SMAJXXCA,42510 ESD-LVC,5.0SMDJXXCA,NSMD 1206,SMFXXA,USMD1210,06100,LMJ12,HV530,LSMD2920,LMJ10,12113,HV650,SMBJXXCA,SRC39,ANL SERIES,SMAJXXA,0603,TRM SERIES,PTN062H05B-M,62 720,PTN2510U05A,ASML0402,TRG SERIES,SRC25,MSMD 1812,HCT0,LET0,NSML***L1505,SMCJXXA,LMT0,LMJ25,HFMM0,MSML1812,SMCJXXCA,TRC SERIES,04100,PSMD0805,FSMD0603,FSMD 0603,SRC59,10 800,NSML1206,5.0SMDJXXA,PVAH1U,2410,06110,12 113,12100,12 110

2018年 - 竞沃 - 选型指南 - REV.1 代理服务技术支持现货查询批量订货

电安科技PPTC保险丝选型表

电安科技提供了PPTC保险丝系列产品，种类齐全。产品可用在汽车电子、工业，通讯、新能源等领域。

产品型号	品类	Vmax(V)	Imax(V)	IH(A)	IT(A)	PD(W)	Ri min(Ω）	Package
0603N0040/24F000	自恢复保险丝	24V	20V	0.04A	0.12A	0.5W	4Ω	0603

选型表 - 电安科技立即选型

【产品】贴片1206封装PPTC 1206N系列自恢复保险丝，电压6V~60V，电流0.05A~2A

贴片1206封装PPTC 1206N系列自恢复保险丝是电安科技推出的广泛应用于电子烟、充电宝、USB口，蓝牙耳机，工业产品等市场领域的一款普通阻抗系列自恢复保险丝。 1206N系列自恢复保险丝的核心是由高分子材料和导电颗粒组成，1206封装，电压从6V到60V，电流从0.05A到2A，工作时的环境温度为-40~85℃，为普通阻抗系列，符合Rohs环保要求。

2020-03-29 - 新产品代理服务技术支持现货查询批量订货

桑德斯（SMC）平面型TVS芯片选型指南

目录- TVS Die-Planar

型号- SZ24300R,SZ05300R,SZ05500R,SZ15300R,SZ15500R,SZ12500R,SZ24500R,SZ12300R

2016/3/3 - SMC - 选型指南代理服务技术支持现货查询批量订货

江苏应能微电子（APM）产品介绍培训：2024年春季期

型号- DC-DC,TVS,SGT,LDO

2024/3/6 - 应能微 - 商品及供应商介绍代理服务技术支持现货查询批量订货

【产品】贴片SOD523封装双极性TVS二极管保护阵列TPA5235B，脉冲功率为40W

贴片封装TVS二极管保护阵列TPA5235B是电安科技推出的广泛应用于工业控制、通信产品，电源产品、消费类产品等市场领域的低容值静电保护器件。TPA5235B属于硅基产品，采用SOD523封装，为双极性，脉冲功率为40W（8/20u波形），Vrwm电压为5V，工作时的环境温度为-55~125℃，有卓越的钳位能力，反向漏电流小，响应时间快等优点。