【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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目录- 公司简介 PPTC自恢复保险丝基本原理 PPTC元件选型指南 PPTC自恢复保险丝应用领域常规表面贴装低阻表面贴装插件式条状式圆环

型号- JK-P380,JK-NSMD350L-12,JKH30-050,JK-SMD0805-350L-12,JK-SMD0805-075L-12,JK-NSMD300L,JK60-025,JK-MSMD190L,JK250-020U,JK-NSMD050-30,JK-P260,JK-SMD0805,JK-MSMDL SERIES,JK60-030,JK30-090,JKH16-900,JK-MSMD075-33,JK-MSMD600L,JK16-1400,JK-NSMD050-24,JK-NSMD100-13.2,JK-SMD1210-035-30,JK-MSMD075,JK16-800,JK60-135,JK16-030(T),JK600-150U,JK-SMD0805-200L,JK60-017,JK-SMD1210-500L-12,JK-D170,JK-MSMD075-24,JK60-020,JK-D175,JK-SMD-0603-200L,JK-MSMD110-16,JK-SMD1210-450L-12,JK-SMD1210-175L-12,JK-SMD1210-350L,JK-SMD2920 SERIES,JK-MSMD500L-12,JK-MSMD500L,JK60-005,JK250-030U,JK60-250,JK30-075,JK60-010,JK60-375,JK-SMD1210L SERIES,JKH16-800,JK-MSMD050,JK16-1300,JK16-700,JK-MSMD850L,JK-NSMD650L,JK600-160U,JK-MSMD750L-12,JK-H1-4,JK-H1-2,JK-H1-3,JK-MSMD160,JK-MSMD450L-12,JK250-145U,JK-P180,JK-NSMD600L-12,JK-MSMD200-12,JK250 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SERIES,TLC-MSMD250/8,TRA020,TRE500,TRB110,TRM100,TAL175,TLC-USMD110,TLC-PSML260,TLC-LSMD050,TRA135,TLC-NSMD110,TLC-NSML200/12,TRA017,TLC-PSML380,TLC-FSML100,TLC-MSMD050/30,TLC-MSMD050/33,TRA250,TLC-USMD150/8,TLC-MSML300,TRA010,TRB220,TAL500,NSM _L1505,TLC-PSML268,TLC-NSML190,TLC-USMD200,TLC-USMD075/8,TLC-NSML350/12,TLC-MSML500/16,TLC-NSML400L,TLC-PSML150,TLC-MSML500/12,TLC-NSMD100,TLC-USMD020/24,USML1210,TRA005,TD250-2,TLC-FSML110,TLC-NSMD025/24,TD250-1,TLC-ASML100,TLC-MSMD050/24,TRA120,TRC300,TLC-USML175,TLC-LSMD075/60,TRM200,TLC-LSMD075,TLC-USML380,TLC-USML260,TLC-FSML200,TLC-MSMD200/12,TLC-LSMD260D,TLC-MSML200,TRA110,FSML0603,TLC-NSML175,TRB200,TLC-MSMD050/16,TLC-LSMD185,TLC-LSML900,TLC-USML150,TLC-MSMD200/24,TLC-MSMD200/20,TLC-NSMD200,TD,TLC-MSML450,TLC-MSMD200/16,TLC-LSMD030/50,TLC-MSML500T,TAL410,TLC-NSMD035/16,TLC-NSML500L,TLC-MSMDO10/30,TLC-LSMD250,TRF014U,TLC-PSMD010/24,TLC-NSMD035,TLC-FSML150,TLC-PSMD100,TLC-NSMD150,TLC-MSML500,TRB300,TAL300,TLC-NSMD035/24,TLC-PSML075,TRM 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电安科技推出48V电源端口高浪涌防护TVS AK6系列，8/20μs脉冲电流高达6000A

电安科技针对48V电源端口的浪涌防护，推出了高Ipp的TVS防护器件AK6系列，其8/20μs脉冲电流高达6000A，采用高能玻璃钝化芯片工艺，具有极高的可靠性。

2024-12-09 - 产品代理服务技术支持批量订货

【选型】RS-485接口的防雷设计电路，该如何选择保护器件？

本文介绍使用力特公司的气体放电管、PPTC和TVS来设计防雷电路，有效保护RS-485总线。

2017-06-21 - 器件选型代理服务技术支持批量订货

【选型】电安科技自恢复保险丝PPTC选型指南

目录- 自恢复保险丝PPTC

型号- 1812L1700/6A000,2920L2110/16A000,1812N1150/13B000,1206N0120/30D000,1812N1150/16A000,1812L1400/12B000,1812L,2920L1600/24B000,1812N,0805N0750/6E000,2920L2110/24A000,1206N0750/16D000,2920N1300/6B000,1206L1350/6F000,0603L0750/9F000,0805N0200/9F000,1206L1260/12F000,1206L1450/6D000,1210L1600/6C000,1210L1260/6E000,1812L1550/6B000,2920N1500/16A000,1210L1200/6E000,2920L1900/16A000,1206N0050/60D000,0805L1125/6F000,1812L1400/6B000,1206L1650/12D000,1206L1350/12F000,0805N0100/24F000,1812L1700/12A000,1812L1650/6A000,0805L1300/12E000,1210N1110/16E000,1812N0500/24B000,1812N1150/24A000,0603L0750/6F000,0805L1500/12F000,1206L1750/6D000,1210N0750/24E000,1206L1450/12D000,1210L1750/12C000,1210N0050/60E000,0603L11750/6E000,0603L1300/6E000,1812N1300/8A000,1206L1260/6F000,2920N1500/12A000,1210L1380/12E000,0603N,1210L1450/6E000,1206L1380/6D000,0603L,1812L1750/12A000,0805L1350/6E000,1812N0500/16B000,2920N1260/16B000,0805L1350/12E000,2920L1900/24A000,0603L1260/9E000,1210L1300/12E000,0805N0100/16F000,0805L1260/12E000,2920L1600/16B000,0805N0500/6F000,1206N1110/16D000,2920L1800/24B000,1812N0750/24B000,1210L,1812N1160/8B000,1210N,2920N1400/12A000,1206L1650/6D000,1206N0350/24F000,1812N1110/33A000,1210L1450/12E000,0805L1750/6F000,1812N1110/8B000,1206L1600/6D000,1210N0750/6E000,0603L1200/6E000,0603N0040/24F000,0603N0350/6F000,0805L1750/12F000,1210L1380/6E000,1206N0100/30D000,0603L1100/9F000,1210L1650/12C000,2920L1800/16B000,1210L1175/12E000,1206N0250/24F000,0603L1300/9E000,2920N1250/16B000,1812N0750/33A000,1812N1125/8B000,0603L0500/9F000,0805N1000/6E000,2920N0750/33B000,1812L1450/12B000,1206N0500/6F000,1812N1260/16A000,2920N1300/24A000,1812N0200/30A000,1206N0160/30F000,2920L2120/16A000,0805L1200/12F000,0805L0750/12F000,1210L1400/12E000,1812L1260/12B000,1206N1110/8F000,1812N0100/60A000,1812L1900/12A000,0805L1200/6F000,1812L1600/12A000,1210L1600/12C000,2920L1700/24B000,1210N1150/6E000,1210N0500/16E000,0805L1260/6E000,1812N0750/13B000,2920N1185/33A000,1206L1400/12D000,0805L1110/12F000,1206L1200/6F000,1812L1500/6B000,0603N0500/6E000,1210L1700/6C000,1812L1300/12B000,2920N,2920N0300/60B000,1210L1150/12E000,2920N1200/16B000,2920L,1812L1750/6A000,1206L1200/12F000,0805L1400/6E000,1812L1650/12A000,1206N0200/24F000,0805L13800/12E000,1812L1800/12A000,1206L1750/6F000,0805N0050/24F000,2920N1125/33B000,0805L1400/12E000,1812N1110/24A000,1206L1300/6F000,0805L1500/6F000,1210N1200/6C000,1206L1400/6D000,1210N1175/6C000,1812L1350/12B000,1206L1550/12D000,2920L1500/24B000,1206L1700/12D000,1812N1200/13B000,1812L1500/12B000,1812N1260/8A000,0805L1110/6F000,0603N0200/9F000,0805L1300/6E000,0603L1125/6F000,1206N0500/13F000,0805L1380/6E000,2920N1400/16A000,1812L1800/6A000,2920L2100/16A000,2920L2120/24A000,1812N0300/30A000,1206N0500/24D000,0603L1100/6F000,1206L1700/6D000,1812N1125/24A000,1210N0100/30E000,1812N1200/8B000,0603L0350/6F000,1206L1750/12D000,1210L1300/6E000,1206N1200/6D000,0805N,0805L,2920N1100/33B000,1210L1500/6C000,0805N0250/6F000,1812N1200/16A000,1210L1650/6C000,1812L1450/6B000,1206L1150/6F000,0805N1100/6E000,1812N1260/13A000,1206L1500/12D000,1812L1300/6B000,0805N0050/16F000,1812N1125/16A000,1206N0350/16F000,1812N1160/13B000,1210N0350/16E000,1210L1500/12C000,2920N0500/60B000,1206L1150/12F000,1206L1750/12F000,1210N0200/30E000,1210L1260/12E000,1206L1300/12F000,1812N1150/8B000,1812L1550/12B000,1812L1900/6A000,1206L,1206N0500/16F000,1206N,1206N0750/13F000,1210L1700/12C000,1206N1150/6D000,0603L1260/6E000,1210L1350/6E000,1210L1400/6E000,1206N1110/13D000,1812L1350/6B000,1210L1350/12E000,1210L1800/12C000,2920N1260/24B000,1210L1800/6C000,1206L1380/12D000,1812N1110/16B000,2920N1200/24A000,1206N0050/30D000,0603N0100/16F000,1812L1850/6A000,0805N0350/6F000,0603L11750/9E000,1206L1600/12D000,1206N1100/8F000,1812L1600/6A000,1206N0100/60D000,1812N0140/60A000,1812N0500/30B000,1206N0750/8F000,2920L2100/24A000,1812N1160/16A000,2920N1150/33B000,1206L1500/6D000,0805L1125/12F000,1206L1550/6D000,1210L1550/6C000,2920L1700/16B000,0603L0500/6F000,1206N0250/16F000,1210N1110/6E000,0603N0250/9F000,1812N1250/16A000,2920N1300/16A000,0805N0300/6F000,0603L1200/9E000,1812L1850/12A000,1210L1200/12E000,0603L0350/9F000

电安科技 - 选型指南代理服务技术支持批量订货

端子SMD和SMDC系列表面贴装PolySwitch®自恢复PPTC规格书

描述- 该资料介绍了Littelfuse公司生产的PolySwitch®可恢复式PPTC表面贴装系列产品的技术规格和应用信息。该系列产品提供表面贴装过流保护，适用于空间受限且需要可恢复保护的应用。产品具有广泛的规格范围、低电阻、快速断开时间等特点，适用于移动电子、电池、汽车、多媒体、工业控制和游戏机等领域。

型号- RF4439-000,SMD075F/60,RF0316-000,RF0308-000,RF0324-000,RF0317-000,RF2287-000,SMD200F/24-2920,RF0315-000,RF0323-000,RF4438-000,SMD150F/33,RF2286-000,SMD250F/15-2920,RF0318-000,DECASMDC050F/60,SMD185F,SMD200F,RF0314-000,RF3102-000,RF3763-000,RF1238-000,SMDC030F,SMD100F/33,SMD250F,SMDC050F,RF0313-000,SMD030F-2018,RF0319-000,SMD,RF0326-000,SMD SERIES,SMD150F/33-2920,SMDC310F/18,SMD100F-2018,RF0325-000,SMDC SERIES,SMDC185F/33,SMD150F,SMD300F,RF0312-000,SMDC075F,SMD100F,SMDC300F/24,RF1478-000,RF0320-000,SMDC125F/33,RF0311-000,SMD310F/18,RF4441-000,SMD300F/15,SMD050F,RF1835-000,SMD030F,RF3182-000,RF0322-000,SMD125F,SMD260F,SMD150F-2018,SMDH160,SMD150F/33-2920-2,RF2285-000,RF4298-000,RF1479-000,RF1342-000,RF0321-000,SMDC50F,SMDH120,SMD075F,SMD200F-2018,SMDC

09/26/24 - LITTELFUSE - 数据手册代理服务技术支持批量订货查看更多版本

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

【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批量订货

电安科技TVS选型表

电安科技提供了从200W到30000W的宽功率浪涌保护方案，产品可用在汽车电子、工业，通讯、新能源等领域。

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。

2020-04-09 - 新产品代理服务技术支持批量订货