【应用】可承受2KA浪涌的小尺寸GDT助力太网RJ45接口防雷保护

时间： 2018-03-26 来源：世强

技术问答

以太网通信中，为提供良好的共模抑制（信号线与环境之间的共模信号）、对频带内有用的信号进行高质量传输，同时需要做防雷保护设计，其经典的电路架构为：RJ45接口-以太网变压器-TVS阵列-以太网PHY芯片，参考电路如下图1所示。

图1：RJ45接口与以太网PHY芯片之间通信的防雷参考电路

针对如上的设计，当使用网络线连接线小于10m的设备并充分暴露在直击雷区间时，是有严重的安全性的，尽管网络变压器自身设计时有2KV~3KV耐压能力，不过针对雷雨天气，出现的高浪涌电流1KA~2KA将通过RJ45接口对网络变压器及后级PHY芯片造成非常严重的冲击，甚至将RJ45接口烧毁，那么为提升产品的可靠性，要如何做设计改善呢？

需要进一步做两级防雷及ESD保护：

1、第一级是在RJ45接口输入端与以太网加入GDT气体的放电管，将浪涌电流通过开关式气体放电管泄放到大地；

2、第二级使用一颗ESD保护器件-TVS阵列，它能够将残留的频率成分浪涌吸收，并且在IPP下钳位电压下降到8V左右，这样使以太网PHY芯片处于安全保护状态。

针对如上的改善设计，电路构架变成：RJ45接口-GDT-以太网变压器-TVS阵列-以太网PHY芯片，这里推荐一款LITTELFUSE的两端子、表面贴装，标称直流击穿电压90V、冲击击穿电压500V的中低浪涌GDT，型号为SG90，实物图及尺寸图参考如下图2所示。

图2：SG90气体放电管实物图及尺寸图

Littelfuse的SG90气体放电管采用微型封装，专为小尺寸（4.5x3.2x2.7mm）的PCB表面贴装而设计，可承受2KA浪涌电流，并能够转移1000A的脉冲，并且不会造成损害。插入损失低，尤其适用于宽带设备。

功能与特色:

• 无铅产品，且符合RoHS标准千兆赫工作频率

• 多脉冲占空周期具有出色的稳定性

• 对快速上升瞬态电压具有出色的响应能力

• 超低插入损失，参考如下表1所示。

图3：SG90气体放电管在不同频率下的插损对标表

• 根据IEC 8100-4-5标准，以8/20μs脉冲进行测试的浪涌能力达1-2KA

• 超小型设备，可提供各种安装引线类型

• 无放射性

• 低电容（<1 pF）

• 通过UL认证

• 符合ITU-T K12、IEC 1000-4-5标准

• 方形外观

而针对第二级使用的ESD保护器件-TVS阵列，推荐littelfuse的SLVU2.8-4BTG-S，可参考《容值低至2pF以内的TVS阵列助力以太网PHY防雷设计》一文，本文不再详细介绍，文章链接如下：https://www.sekorm.com/news/11374.html

如果您感兴趣记得收藏和点赞哦，感谢！有问题请留言或电话联系世强400-887-3266。

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SMD,SE362A,SS071A - SMD,SM 系列,SPI351D - XX,TZ351M - SMD,SPB801H - XX,SYXXXX-SMD,TR251H,SE471H,SD471A - L,TB075M - L,SF-L 系列,TR251M,TR091M - SMD,SSXXXX-SMD,SY421T - SMD,SE471M,TZ231M - L,SD801A - L,SPR 系列,SX 系列,TPA142H - XX,SZ091Z - SMD,SY075T - SMD,SF452T,TZ421A - SMD,SC421H - SMD,SUXXXX-SMD系列,SD091A - SMD,SD231A - L,SE351H,SPPXXXX-XX系列,SX201Y - SMD,SK102M - SMD,SE351M,SPP601P - XX,SPP601P-XX,TZ-SMD,SPCXXXX-XX,TS471T - SMD,SXXXXX-SMD,SF251M,SE801H,SPIXXXX-XX,TZ151M - L,SPH 系列,SE801M,SF251A,TR091H - SMD,TR421M - SMD,TZ351A - SMD,SS421A - SMD,SPSXXXX-XX,TSXXXX-SMD系列,SD801A - SMD,TY351A - SMD,SS601A - SMD,TR471H - SMD,SE151H,TR151H,SPH601D - XX,SF252T,TR151M,TY231A - SMD,SE151M,SPB202H - XX,TB251A - L,TB471M - L,SSXXXX-SMD系列,TZ071M - L,TPA,SU801M - SMD,SF471M,SS801A - SMD,SK601H - SMD,SF362T,TZ231A - SMD,SD075A - SMD,TZ471A - SMD,SF471A,SE152M,TS421T - SMD,SPBXXXX-XX系列,TB075A - L,SD071A - SMD,SW075Y - SMD,SMXXXX-SMD,SF351M,SX401X - SMD,TS 系列,SS301A - SMD,TZ471A - L,TZ151A - SMD,SC471H - SMD,SU251M - SMD,SF351A,SC231H - SMD,TZXXXX-SMD,TR151H - SMD,SPS 系列,SD091A - L,SPV601D - XX,SC351H - SMD,SK421H - SMD,SPB,SPB102H - XX,SPA,SPC,TR075H,TR 系列,SPH,SX091Y - SMD,TR075M,SPJ,SPI,SPK,SX151Y - SMD,SF801M,SPP,SC091H - SMD,SPR,SW601Y-SMD,SM601H - SMD,SPS,SPV,SF151M,SU421A - SMD,SPJ601D-XX,SF 系列,TB351M - L,SPI 系列,SPJ152H-XX,SPK102D - XX,SD071A - L,TZ251M - SMD,SY201T - SMD,TYXXXX-SMD,TZ091A - SMD,TZ421A - L,SY801T - SMD,SN151A - SMD,SW151Y - SMD,SF151A,SPB152H - XX,TPA801H-XX,SPI801D - XX,SX401Y - SMD,SX601X-SMD,SE075H,SE 系列,SPA351D-XX,TB231A - L,SPJ102H-XX,SW091Y - SMD,SX075X - SMD,SU601A-SMD,SE075M,SPJ 系列,SPJ801D-XX,SF152A,TR601M - SMD,SU231A - SMD,SK801M - SMD,SM351H - SMD,SW401Y - SMD,TR351M - SMD,SZ401Z-SMD,SM471H - SMD,SU601A - SMD,SM231H - SMD,SPKXXXX-XX系列,SU471A - SMD,SPK601D - XX,SX075Y - SMD,SPC351H - XX,TR471M - SMD,TB421M - L,SS231A - SMD,TR601M,SPHXXXX-XX,TZ071A - SMD,TYXXXX-SMD系列,SC071H - SMD,SW231Y - SMD,SC075H - SMD,SM091H - SMD,TY601A - SMD,TR231M - SMD,SMXXXX-SMD系列,SD091A-SMD,TB-L 系列,SN071A - SMD,SD231A - SMD,TZ091A - L,TR601H,SN075A - SMD,SY231T - SMD,TS601T-SMD,SZ231Z - SMD,TS251T - SMD,SPV 系列,SK351H - SMD,SK091M - SMD,SX301X - SMD,SPR202H-XX,SPHXXXX-XX系列,TZ075A - SMD,SE601H-L,SU 系列,SX151X - SMD,SN601A-SMD,SPCXXXX-XX系列,SWXXXX-SMD,SF075M,TY421A - SMD,SE601H,SW201Y - SMD,SZXXXX-SMD系列,TZ071M - SMD,SPP801P - XX,TR231H - SMD,SM421H - SMD,SE601M,SKXXXX-SMD系列,TBXXXX-L系列,SF075A,SD601A - L,SZ201Z - SMD,SPVXXXX-XX系列,SN401A - SMD,TZ075M - L,SF601A-L,SF801A,SK351M - SMD,SX471X - SMD,TZ075M - SMD,TZ231A - L,TR091M,SK091H - SMD,SPK 系列,TR-SMD 系列,TZ-SMD 系列,SU801A - SMD,SZ151Z - SMD,SY301T - SMD,SPS801G - XX,SK601M - SMD,TB601M - L,TR091H,SK102H- SMD,TZ471M - SMD,SX231X - SMD,SU151M - SMD,TR601H - SMD,SE402A,SD251A - L,SNXXXX-SMD,TB231M - L,TRXXXX-SMD,SF601A,SPA801D-XX,SD-SMD 系列,TR-SMD,SC151H - SMD,SPA 系列,SW301Y - SMD,TR151M - SMD,SU151A - SMD,SD151A - SMD,SY151T - SMD,SN801A - SMD,TZ471M - L,TB601M-L,TS351T - SMD,TZ251A - L,SPB 系列,SX201X - SMD,SX801X - SMD,SK421M - SMD,SDXXXX-SMD系列,SE091M,SPK091D - XX,SY601T-SMD,SE091H,SD-SMD,TR421H - SMD,SF601M,TPA 系列,SPJ351D-XX,TZ-L,TB251M - L,SPA601D-XX,TPAXXXX-XX系列,SS201A - SMD,TZ601A - L,SS 系列,TB351A - L,SKXXXX-SMD,SW471Y - SMD,SE421H,SD421A - SMD,TRXXXX-SMD系列,SN351A - SMD,TZ351M - L,SE421M,SPIXXXX-XX系列,SPAXXXX-XX,SY601T - SMD,TS151T - SMD,SW601Y - SMD,TY601A-SMD,TZ075A - L,SPB151H-XX,SW421Y - SMD,SF402T,TY 系列,SPKXXXX-XX,TZ231M - SMD,SPS601G - XX,SU601M - SMD,TZ091A-SMD,SDXXXX-L系列,SE302A,SEXXXX-L,TR421H,SS091A - SMD,SX421Y - SMD,SD091A-L,SUXXXX-SMD,SF091M,TR421M,TR601M-SMD,SM251H - SMD,SU251A - SMD,TR075M - SMD,SN231A - SMD,SY401T - SMD,SFXXXX-L,TS091T - SMD,SF091A,TZ071A - L,SPC 系列,SX601Y - SMD,SY091T - SMD,SW 系列,SF-L,TB601A - L,TBXXXX-L,SN471A - SMD,SU421M - SMD,TZ421M - L,SY471T - SMD,SPR601D - XX,SXXXXX-SMD系列,SZ301Z - SMD,SK 系列,SZXXXX-SMD,SE102M,SD421A - L,SC801H - SMD,SDXXXX-L,SX301Y - SMD,TZ151M - SMD,SF421A,SX601X - SMD,SD351A - L,SF421M,SU471M - SMD,SPRXXXX-XX系列,SPR302H-XX,SX421X - SMD,SN421A - S

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型号- SPP601P-XX,SPCXXXX-XX,SPI252H - XX,SPI601D - XX,SPHXXXX-XX,SPIXXXX-XX,SPIXXXX-XX系列,SPBXXXX-XX,SPAXXXX-XX,SPH 系列,SPJXXXX-XX,SPP 系列,SPB151H-XX,SPSXXXX-XX,TPA801H - XX,TPAXXXX-XX,SPV 系列,SPH601D - XX,SPR202H-XX,SPKXXXX-XX,SPHXXXX-XX系列,SPS601G - XX,SPB202H - XX,SPH351D - XX,SPB601H-XX,SPCXXXX-XX系列,TPA,SPP801P - XX,SPB091H-XX,SPBXXXX-XX系列,SPVXXXX-XX系列,SPC 系列,SPC801H - XX,SPJXXXX-XX系列,SPK601D-XX,SPV351D - XX,SPB351H-XX,SPRXXXX-XX,SPVXXXX-XX,SPK 系列,SPS 系列,SPV601D - XX,SPR601D - XX,SPB,SPB102H - XX,SPA,SPV601D-XX,SPC,SPH,SPJ,SPI,SPS801G - XX,SPK,SPP,SPR,SPS,SPV,SPRXXXX-XX系列,SPR302H-XX,SPH801D - XX,SPSXXXX-XX系列,SPJ601D-XX,SPH601D-XX,SPS601G-XX,SPA801D-XX,SPI 系列,SPJ152H-XX,SPK102D - XX,SPA 系列,SPR601D-XX,SPB152H - XX,TPA801H-XX,SPI801D - XX,SPB 系列,SPI351D - XX,SPR801D-XX,SPI152H - XX,SPB801H - XX,SPA351D-XX,SPJ102H-XX,SPJ 系列,SPJ801D-XX,SPK091D - XX,SPR 系列,TPA 系列,SPC102H - XX,TPA142H - XX,SPJ351D-XX,SPI601D-XX,SPPXXXX-XX,SPC601H - XX,SPPXXXX-XX系列,SPAXXXX-XX系列,SPV801D - XX,SPKXXXX-XX系列,SPA601D-XX,SPK601D - XX,TPAXXXX-XX系列,SPC601H-XX,SPC351H - XX,SPP601P - XX

选型指南 - 赛尔特 - V1.0 - 2024/1/28 PDF 中文下载

【产品】可抗10kA浪涌的气体放电管（GDT），平坦响应最高可达10kV/μs

SL1122A系列静电放电抑制器由Littelfuse出品，是一种高性能的阿尔法气体等离子体管与MOV的结合品。SL1122A系列静电放电抑制器在处理100V/µs到10kV/µs的快速上升的瞬变的抑制中具有突出表现，可安全地保证器件在最高为10000A的脉冲中免受破坏。SL1122A系列静电放电抑制器非常适用于MDF保护、ADSL设备、XDSL设备、警报控制盘和一般电信设备等领域。

新产品发布时间 : 2018-07-24

SE系列陶瓷气体放电管(SE Series Gas Discharge Tube GDT)

型号- SE075H - *,SE075M - *,SE231M - *,SE801M - *,SE151M - *,SE102M - *,SE252A - *,SE091M - *,SE091H - *,SE351H - *,SE801H - *,SE SERIES,SE601M - *,SE302A - *,SE152M - *,SE151H - *,SE601H-L,SE601H - *,SE351M - *,SE471M - *,SE系列,SE362A - *,SE471H - *,SE231H - *

数据手册 - 赛尔特 - V2.2 - 2023/7/29 PDF 中英文下载

赛尔特（SETsafe丨SETfuse）插件型气体放电管选型指南

型号- SE421H,TZ351M - L,SF251M,TR601M,TZ251M - L,SE231M,SE801H,SE421M,TZ151M - L,SE231H,SE801M,SF251A,SF102A,TB-L 系列,TZ075A - L,TZ091A - L,TR601H,SF402T,TB421A - L,TZXXXX-L系列,SE151H,TR151H,SF252T,TR151M,TR601M-L,SE601H-L,SDXXXX-L系列,SE151M,SE302A,SEXXXX-L,TB251A - L,TB471M - L,TR421H,SF075M,TZ071M - L,SE601H,TR231H,SD091A-L,SF471M,TZ601M - L,TR231M,SFXXXX-L系列,SF091M,TR421M,SF362T,SE601M,SF471A,SE152M,TBXXXX-L系列,SF075A,TB075A - L,SFXXXX-L,SD601A - L,SF091A,TZ071A - L,SF351M,SE452A,TR351H,SF202T,TZ075M - L,SF601A-L,SD 系列,SF801A,TZ471A - L,TR351M,SF351A,TZ231A - L,TR091M,SF-L,TB151A - L,TB601A - L,SD091A - L,TBXXXX-L,SE-L 系列,TZ-L 系列,SD075A - L,TZ351A - L,TZ421M - L,SF231M,TRXXXX-L,TZ091A-L,SE102M,TZ091M - L,TR075H,SD421A - L,SE251H,TB-L,TR 系列,TR471H,TR075M,TR471M,TZ 系列,TB601M - L,TR091H,SF231A,SF801M,SDXXXX-L,SF421A,SE251M,SD-L 系列,SD351A - L,SF421M,TB091A - L,TR-L 系列,TR-L,SE402A,SD151A - L,SD251A - L,SF151M,SE252A,TB 系列,TB231M - L,SF601A,TB351M - L,SF 系列,TZXXXX-L,TB151M - L,SD071A - L,TZ421A - L,SF151A,SE-L,TZ471M - L,TB601M-L,TZ251A - L,SE362A,SF302T,SE075H,TR251H,SE 系列,SE471H,SD471A - L,TB075M - L,TB231A - L,TB091M - L,TR251M,SF-L 系列,SE091M,SE075M,SF152A,SE471M,TZ231M - L,SE091H,SD801A - L,SE202A,SF601M,TZ-L,SF452T,TB471A - L,TB251M - L,SD231A - L,SE202M,SE351H,SEXXXX-L系列,SE351M,SD-L,TRXXXX-L系列,TZ601A - L,TB351A - L,TB421M - L,TZ151A - L

选型指南 - 赛尔特 - V1.0 - 2024/1/28 PDF 中文下载

SH Series Gas Discharge Tubes

型号- SH230,SH90,SH350,SH250,SH470,SH400,SH300,SH145,SH SERIES,SH600,SHXX,SH,SH75

数据手册 - LITTELFUSE - 03/09/21 PDF 英文下载

Littelfuse（力特） SL1011A/SL1411A系列气体放电管数据手册

型号- SL1011A075A,SL1411A,SL1411A800A,SL1011A150,SL1011A600A,SL1411A600A,SL1011A230,SL1011A075,SL1011A350,SL1011A470,SL1011A250,SL1011AXXXX,SL1411AXXXXX,SL1411A470A,SL1011A470A,SL1411A600,SL1411A800,SL1411A090C,SL1411A470,SL1411A250,SL1411A350,SL1411A075,SL1411A230,SL1411A150,SL1011A090,SL1411A090,SL1011A260,SL1011A,SL1011A145,SL1411A350A,SL1011A600,SL1011A500

数据手册 - LITTELFUSE - Revised: 11/23/16 - 2017年08月15日 PDF 英文下载

赛尔特（SETsafe丨SETfuse）贴片型气体放电管选型指南

型号- SU351A - SMD,SS231A - SMD,TZ071A - SMD,TYXXXX-SMD系列,SC071H - SMD,SW231Y - SMD,SC075H - SMD,TZ601M - SMD,SM091H - SMD,SC601H-SMD,TY601A - SMD,TR231M - SMD,SM151H - SMD,SD091A-SMD,SMXXXX-SMD系列,SN071A - SMD,SD231A - SMD,SN075A - SMD,SY231T - SMD,TS601T-SMD,SZ 系列,SZ231Z - SMD,TS251T - SMD,TZXXXX-SMD系列,SM801H - SMD,SK351H - SMD,SK091M - SMD,SX301X - SMD,TZ421M - SMD,TZ601A - SMD,TZ075A - SMD,SU 系列,SX151X - SMD,SN601A-SMD,SX231Y - SMD,SWXXXX-SMD,TY421A - SMD,SW201Y - SMD,TZ071M - SMD,SZXXXX-SMD系列,TR231H - SMD,SM421H - SMD,TY251A - SMD,SN601A - SMD,SKXXXX-SMD系列,SX091X - SMD,SS601A-SMD,SYXXXX-SMD系列,SC601H - SMD,SZ201Z - SMD,SN401A - SMD,SNXXXX-SMD系列,TSXXXX-SMD,SD 系列,SK351M - SMD,SX471X - SMD,TZ075M - SMD,SK091H - SMD,TR-SMD 系列,TZ-SMD 系列,SU801A - SMD,SZ151Z - SMD,SY301T - SMD,SN201A - SMD,TR075H - SMD,SCXXXX-SMD,SC 系列,TZ 系列,SU091A - SMD,SK601M - SMD,SK102H- SMD,SM601H-SMD,TZ471M - SMD,SD251A - SMD,SCXXXX-SMD系列,SX231X - SMD,SN091A - SMD,SX801Y - SMD,SX471Y - SMD,SU151M - SMD,TR251M - SMD,TR601H - SMD,TS601T - SMD,SNXXXX-SMD,SK801H - SMD,SN 系列,TRXXXX-SMD,SD-SMD 系列,TR-SMD,SZ401Z - SMD,SC151H - SMD,TS231T - SMD,SW301Y - SMD,SM075H - SMD,SU091M - SMD,TR151M - SMD,SS351A - SMD,SU151A - SMD,SD151A - SMD,TR351H - SMD,SY151T - SMD,SN801A - SMD,SY 系列,TS351T - SMD,SW351Y - SMD,SX201X - SMD,SX801X - SMD,SS071A - SMD,SM 系列,TZ351M - SMD,SK421M - SMD,SYXXXX-SMD,SDXXXX-SMD系列,TR091M - SMD,SY421T - SMD,SSXXXX-SMD,SY601T-SMD,SD-SMD,TR421H - SMD,SX 系列,SZ091Z - SMD,SY075T - SMD,TZ421A - SMD,SC421H - SMD,SUXXXX-SMD系列,SD091A - SMD,SX201Y - SMD,SK102M - SMD,SS201A - SMD,SS 系列,SKXXXX-SMD,SW471Y - SMD,SD421A - SMD,TZ-SMD,SN351A - SMD,TRXXXX-SMD系列,TS471T - SMD,SXXXXX-SMD,SY601T - SMD,TS151T - SMD,SW601Y - SMD,TY601A-SMD,TR091H - SMD,TR421M - SMD,TZ351A - SMD,SS421A - SMD,SD801A - SMD,TSXXXX-SMD系列,SW421Y - SMD,TY351A - SMD,SS601A - SMD,TR471H - SMD,TY 系列,TZ231M - SMD,SU601M - SMD,TZ091A-SMD,TY231A - SMD,SSXXXX-SMD系列,SS091A - SMD,SX421Y - SMD,SU801M - SMD,SS801A - SMD,SUXXXX-SMD,SK601H - SMD,TR601M-SMD,SM251H - SMD,TZ231A - SMD,SU251A - SMD,SD075A - SMD,TZ471A - SMD,TR075M - SMD,TS421T - SMD,SN231A - SMD,SY401T - SMD,SD071A - SMD,SW075Y - SMD,TS091T - SMD,SMXXXX-SMD,SX401X - SMD,TS 系列,SS301A - SMD,SX601Y - SMD,SY091T - SMD,TZ151A - SMD,SC471H - SMD,SU251M - SMD,SW 系列,SC231H - SMD,TR151H - SMD,TZXXXX-SMD,SN471A - SMD,SU421M - SMD,SC351H - SMD,SY471T - SMD,SZ301Z - SMD,SXXXXX-SMD系列,SK421H - SMD,SK 系列,SZXXXX-SMD,TR 系列,SX091Y - SMD,SC801H - SMD,SX151Y - SMD,SC091H - SMD,SX301Y - SMD,TZ151M - SMD,SW601Y-SMD,SX601X - SMD,SM601H - SMD,SU471M - SMD,SX421X - SMD,SN421A - SMD,SU421A - SMD,SWXXXX-SMD系列,TZ251M - SMD,SY201T - SMD,TZ091A - SMD,TYXXXX-SMD,SY801T - SMD,SN151A - SMD,SW151Y - SMD,SM071H - SMD,SW801Y - SMD,SX401Y - SMD,TR251H - SMD,SDXXXX-SMD,SU351M - SMD,SS075A - SMD,SX601X-SMD,SD601A - SMD,SN301A - SMD,SW091Y - SMD,SX075X - SMD,SU601A-SMD,TZ091M - SMD,SC251H - SMD,TR601M - SMD,SK601M-SMD,SU231A - SMD,SK801M - SMD,SS151A - SMD,SD351A - SMD,SM351H - SMD,SW401Y - SMD,TR351M - SMD,SZ401Z-SMD,SM471H - SMD,SU601A - SMD,SD471A - SMD,SM231H - SMD,SU471A - SMD,SU231M - SMD,TZ251A - SMD,SX075Y - SMD,TR471M - SMD

选型指南 - 赛尔特 - V1.0 - 2024/1/30 PDF 中文下载