【经验】金属氧化物压敏电阻和瞬态电压抑制二极管在浪涌防护电路中该怎么选？
金属氧化物压敏电阻（MOV）和瞬态电压抑制二极管（TVS）都是浪涌防护的常用器件，对提升电路的抗浪涌性能有着非常重要的作用。但两者导电机理和结构各有差异，因此在具体应用表现也不尽相同。本文将结合LITTELFUSE的MOV和TVS产品，从二者的导电机理、脉冲能量耗散机理、浪涌防护响应时间的不同进行讨论分析，从而更好的认识MOS和TVS在浪涌防护电路中的应用。
MOV是一种以ZnO为主体，添加多种金属氧化物，经电子陶瓷工艺制成的多晶半导体陶瓷器件，具有非线性导电特性，是抑制过电压、吸收浪涌能量的主要元器件。当施加电压小于击穿电压时，电压几乎全部加在压敏电阻上，其阻抗大于10MΩ，漏电流仅有微安级，当施加电压大于击穿电压时，其阻抗只有欧姆级，通过电流有几十安，其击穿时间只有几十到几百皮秒。如图1所示为Littelfuse的V130LA20A系列U/I曲线图，当电压小于130V时，随电压降低，漏电流逐渐减小，其最大阻抗达到109Ω；当电压大于130V时，随着电压增大，阻抗在1-10Ω左右。
图1 V130LA20A系列压敏电阻的U/I曲线图
TVS是在稳压管工艺基础上发展起来的一种新产品，具有非线性导电特性，是抑制过电压，ESD防护，分为单向和双向两种，目前TVS的PN结反向击穿电压一般大于6V。当施加电压小于反向击穿电压时，其导通电流与PN结势垒及温度有关；当施加电压大于反向击穿电压时，属于雪崩电子击穿导电，其导通电流只与所施加电压有关，雪崩电子击穿时间一般为1-2ns。当片式TVS两端经受瞬间浪涌高能量冲击时，他能够以纳秒级时间使其PN结阻抗降低，将其两端间的电压箝位在一个预定数值。如图2，以Littelfuse的SMAJ系列单向TVS为例，当施加电压小于反向击穿VBR时，TVS的PN结没有被击穿，其电流在VR为微安级别，当施加电压大于反向击穿VBR时，电压逐渐被箝位VBR，同时电流急剧上升到IPP，因此TVS主要是用于瞬态浪涌的箝位。
图2 SMAJ系列单向TVS的U/I曲线图
综合以上分析和对比，MOV和TVS均是浪涌防护的有效器件，如图3所示，针对不同的浪涌防护推荐的浪涌防护器件选型方案，TVS限制电压较低，瞬态内阻较小，适合应用于耐ESD电压特别差或者被保护部位阻抗特别小的部位(如通讯接口等)。而压敏电阻的吸收能量的能力比TVS管要强，除了一般的ESD防护，也特别适合于电源部位和较大瞬态能量的部位过压防护。在响应时间方面，要避免陷入MOV的响应时间慢的误区。由于工艺的差异，MOV的价格相对于TVS表现出良好的性价比，设计人员可以根据电路的实际应用灵活选择MOV或者TVS。
图3 浪涌防护方案器件选型示意图
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描述- 本报告主要针对DO-214AA和DO-214AC封装的TVS STD产品进行第二片晶圆来源和额外EMC来源的认证。报告详细介绍了产品的物理、电气和可靠性测试结果，包括参数测试、可靠性测试和电学特性总结。测试结果显示，第二片晶圆来源和额外EMC来源均符合规格要求，并已通过认证，可用于生产。
型号- P4SMA16A,SMAJ6.0CA,1.5SMB39CA,SMAJ40CA,SMA6J78CA,1KSMB110A,SMBJ8.5CA,SMBJ51A,SMBJ45CA-SA-GT3,SMBJ75A,P6SMB56A,SMAJ60CA-N,SMBJ100CA-N,SMBJ8.0A-23-TR70,SMAJ48CA-23-TR70,SMBJ12CA-SA-GT3,SMAJ120A,SMAJ110CA,SMAJ51CA,SMBJ400A-37,P6SMB30A,SMBJ5.0A-012,P6SMB62CA,SMAJ250A,P4SMA,SMAJ350CA,P4SMA530CA,P4SMA8.2CA,SMAJ13CA-23-RG70,SMAJ64CA,1KSMB7.6A,P4SMA18A,SMA6J54CA,1KSMB8.2CA,SMA6J7.0A,SMAJ8.0A,P4SMA16CA,SMBJ8.5CA-KF,P6SMB100A,SMBJ48CA-23-TR70,SMBJ300A,SMBJ150CA,P4SMA91CA,SMAJ70A,SMBJ6.0CA-SA-GT3,SMAJ75CA,P6SMB400CA,SMA6J43CA,1KSMB9.1A,SMBJ15CA-KF,SMA6J40A,SMBJ16CA,SMA6J64A,SMBJ6.0CA-37,P4SMA27CA,P6SMB170CA,SMBJ120A-23-TR70,SMAJ10CA-23-TR70,SMBJ33A-T7,SMA6J45A,SMBJ7.5CA-23-TR70,P6SMB75A,P6SMB51A,1KSMB160CA,SMA6J5.0A,P6SMB75CA,SMBJ170CA,SMA6J22A,SMBJ16A-23-TR70,P6SMB9.1CA,SMAJ100A,1KSMB27A,1KSMB7.5A,P4SMA300A,SMAJ30A-N,P6SMB250A,SMAJ5.0A-23-TR70,SACB7.0,P4SMA160CA,1KSMB130A,P6SMB7.5CA,SMA6J43A,P4SMA82CA,SMAJ7.0CA-23-RG70,SMAJ18A-23-RG70,SMAJ150A-L,SMBJ400CA,SMBJ36A-GT3,P6SMB120A,SMA6J10CA,P6SMB51CA,SMBJ7.5CA-SA-GT3R,P4SMA18CA,P6SMB6.8A,P4SMA540A,P6SMB300CA,SMAJ90A,SMBJ14CA,SMBJ70A,SMA6J45CA,P6SMB8.2A,SMA6J20A,SMAJ7.0CA,SMBJ48A-23-RG70,SMAJ8.5A,1KSMB30CA,P4SMA550CA,P4SMA56A,P6SMB,SMBJ33CA-MN,P6SMB540CA,SMA6J36CA,SMAJ18CA-23-TR70,P6SMB16A,P6SMB300A,1KSMB22A,SMBJ130CA,1KSMB62CA-N,1.5SMB39A,1KSMB43CA,SMAJ18CA,SMBJ45CA-SA-GT3R,P4SMA33A,SMAJ28A-23-TR70,SMBJ36CA,P4SMA170A,SMBJ5.0A-23-TR70,P6SMB39A,P6SMB15A,SMAJ250CA,1KSMB150A,P6SMA440CA-L,1KSMB47A,SMBJ7.5CA-GT3,SMBJ15CA-ER,P4SMA10A,P6SMB27CA,SMAJ60CA,SMA6J7.5CA,SMA6J58CA,P6SMB91CA,SMA6J12CA,P6SMB200CA,P4SMA12CA,P4SMA480CA,1KSMB24A,P6SMB16CA,P4SMA11A,SMBJ14CA-23-TR70,SMBJ90A,SMBJ12CA,SMBJ58CA,P6SMB13A,SMBJ17CA-23-TR70,SMBJ36A-23-RG70,SMAJ130CA,SMBJ350CA,SMBJ100A-ER,SMBJ5.0A,P4SMA12A,P4SMA36A,P6SMB75A-N,SMA6J85A,P6SMB36A,SMAJ16CA,P6SMB12A,P4SMA36CA,SMAJ5.0CA,SMBJ11CA-54,P6SMA440A-IE,P4SMA13A,SMAJ14A-,P6SMB10A,1KSMB170A,P4SMA47CA,P6SMB11A,SMAJ150CA,1KSMB56CA,P4SMA250A-SF,1KSMB10CA,1KSMB43A,P6SMB100CA,SMAJ8.0CA-23-TR70,SMBJ45CA,P6SMB58A,1KSMB180CA,SMA6J8.5CA,SMBJ170A,SMA6J14CA,SMBJ10CA,P6SMB540A,1KSMB68A,SMBJ6.0CA-23-RG70,SMBJ58A-ER,1KSMB20A,P6SMB18CA,P4SMA15A,SMAJ300A,SMAJ36CA-LC,P4SMA39A,SMAJ150A-23-RG70,SMA6J60A,SMBJ250CA,P6SMB82CA,P6SMB33A,P6SMB400A-102,P4SMA20CA-54,SMAJ6.5CA-23-TR70,P6SMB440CA,1KSMB7.6CA,1KSMB6.8CA,SMAJ36CA-54T7,1KSMB18CA-DH,SMBJ5.0CA,P6SMB47CA,1.5SMB43A,SMBJ220CA,P4SMA480A,SMAJ200CA-54T7,SMAJ14A-23-TR70,P6SMB220CA,SMBJ48A-SA-GT3,SMAJ16A,1KSMB24CA,1KSMB62A,P4SMA130A,P6SMB36CA,SMBJ78CA,SMA6J18CA,1.5SMB20CA,SMAJ48CA,SMBJ43CA,SMBJ170A-SA-GT3R,SMBJ5.0CA-KF,SMAJ17A,SMBJ440CA-23-RG70,SMAJ7.5CA,SMAJ22A-23-TR70,SMAJ13CA-23-TR70,SMBJ45CA-23-TR70,P4SMA110CA,1KSMB110CA,SMBJ9.0A-23-TR70,SMBJ33CA-0028,SMBJ7.0A,SMAJ400A,SMA6J16CA,1.5SMB100CA,SMBJ54CA,SMAJ15CA,SMBJ18A,SMAJ14A,SMBJ150A,SMAJ90CA,SMAJ24A-N,P6SMB12CA,P6SMB58CA,1.5SMB20A,SMAJ300CA,SMAJ15A-54T7,P6SMB440A-101,P4SMA30CA,SMAJ26CA,SMBJ100CA,1.5SMB68A,SMA6J7.0CA,SMAJ15A,1KSMB13CA,1KSMB,SMA6J100A,P6SMB120CA,1.5SMB23A,SMBJ26A-23-TR70,MSMBJSAC5.0,1KSMB82A,1.5SMB33CA,SMBJ16A,SMBJ30CA,1.5SMB47A,SMAJ36A,SMAJ12A,P4SMA51A,P4SMA75A,1.5SMB22A,SMA6J90A,SMAJ8.5CA,SMBJ10A-23-TR70,SMAJ180A,P4SMA150A,SMBJ440CA,1.5SMB68CA,1.5SMB22CA,P4SMA43CA,SMBJ17A,SMAJ15CA-23-TR70,SMAJ13A,SMBJ120CA,SMBJ70CA-ER,SMAJ18A-23-TR70,SMBJ18CA-23-TR70,SMBJ14A,SMBJ5.0CA-23-TR70,P6SMB18A,SMAJ13CA,P4SMA10CA,SMAJ100CA-23-TR70,P4SMA56CA,SMAJ7.0A-23-TR70,SMAJ15A-23-TR70,SMBJ28CA-ER,SMAJ58A,SMBJ130A,SMAJ10A,SMA6J60CA,1KSMB15CA,SMBJ7.5A,SMBJ7.0CA-23-TR70,SMA6J8.0CA,SMBJ15A,SMAJ24CA,SMAJ400CA,SMAJ170CA,1.5SMB24A,P6SMB440CA-L,SMAJ11A,P4SMA30A,P4SMA440A,SMA6J120A,SMA6J51CA,SMBJ9.0A,SMBJ6.0A-54,SMA6J6.0CA,SMBJ58CA-37,SMBJ12A,SMBJ16CA-23-RG70,SMAJ200CA,SMAJ8.5CA-23-TR70,SMBJ36A,P6SMB150A,SMBJ24CA-23-TR70,SMAJ6.0A,SMAJ33CA,SMBJ6.0CA-SA-GT3R,SMBJ350A,1.5SMB82A,SMBJ6.5CA,P4SMA550A,SMA6J26A,SMA6J40CA,1KSMB39CA,P6SMB82A,1.5SMB24CA,SMAJ160A,SMBJ13A,SMBJ85CA,SACB5.0,P6SMB43CA,1KSMB150CA,SMAJ33CA-54T7,SMAJ33A,P4SMA220A,SMBJ6.0A-23-TR70,SMAJ40CA-23-TR70,SMBJ58A,SMBJ22CA-23-TR70,SMAJ85A-L,SMAJ11CA,SMBJ110A,P6SMB30CA,SMBJ220A-L,SMBJ75CA-23-TR70,SMAJ78A,SMBJ300CA,SMAJ54A,SMAJ30A,SMA6J24A,SMBJ5.0A-54,SMA6J48A,SMBJ11CA-SA-GT3R,SMBJ10A,SMBJ36A-23-TR70,SMA6J8.5A,P6SMB8V2CA,SMAJ440CA,SMBJ11A,P6SMB480CA,SMAJ36CA-23-TR70,HTVSB7.0CA-100,SMAJ22CA,SMBJ220A,SMAJ75A,SMBJ51CA-23-TR70,SMAJ51A,SMBJ33A-014,SMAJ100CA,P4SMA510CA,P4SMA9.1A,SMBJ7.5CA,SMA6J5.0CA,P4SMA91A,P6SMB10CA,P6SMB170A,SMBJ12CA-N,P4SMA110A,1.5SMB62A,SMAJ188A,SMA6J6.5A,SMBJ33A,SMAJ6.5A,SMBJ440A,SMA6J75CA,SMAJ20CA,SMAJ6.0CA-23-TR70,SMAJ6.5CA,SMBJ200CA,SMBJ78A,P4SMA7.5A,SMAJ28A-37,P4SMA350A,SMAJ150A-23-TR70,P6SMB56CA,SMA6J64CA,SMA6J28A,SMBJ30A,SMBJ54A,P4SMA6.8CA,SMA6J8.0A,P4SMA180CA,1KSMB130CA,SMBJ200A,SMBJ5.0CA-MD,P6SMB15CA-HW,P6SMB400A-SCH,SMBJ,P4SMA400A,1KSMB18A,P4SMA9.1CA,P6SMB160CA,P6SMB43A,P4SMA15CA,P6SMB68A,SMBJ20CA-SA-GT3,SMBJ70CA,SMBJ170A-SA-GT3,P6SMB110A,P4SMA170CA,SMBJ24A-37,1KSMB9.1CA,SMBJ6.5A-37,P4SMA7.5CA,SMAJ7.5A,1KSMB62CA,SMA6J54A,SMAJ350A,SMA6J78A,SMBJ13A-C,SMAJ60A,SMAJ,P4SMA510A,SMAJ12CA-23-TR70,SMBJ17CA,SMBJ40A,P
【应用】超低电容TVS阵列实现CVBS端口的静电和浪涌保护
SLVU2.8HTG具有2pF的负载电容，超过了IEC61000-4-2ESD标准的ESD最高保护水平。
ASMB系列TVS二极管
描述- 本资料介绍了SETsafe公司的ASMB系列瞬态电压抑制二极管（TVS）。该系列产品提供电路保护功能，能有效地衰减或过滤瞬态过压。其主要特点包括低增量浪涌阻抗、优异的钳位能力、低剖面封装并内置应力缓解设计。适用于通信设备、安全防护、工业控制设备、电源、汽车电子、新能源和防雷等领域。
型号- ASMB47A,ASMB300A,ASMB530A,ASMB11A,ASMB530C,ASMB300CA,ASMB51A,ASMB75A,ASMB150CA,ASMB20CA,ASMB150A,ASMB62CA,ASMB43CA,ASMB24CA,ASMB110A,ASMB47CA,ASMB8.2CA,ASMB18A,ASMB SERIES,ASMB100CA,ASMB58A,ASMB650A,ASMB10A,ASMB13CA,ASMB22A,ASMB650C,ASMB62A,ASMB180CA,ASMB51CA,ASMB36CA,ASMB9.1A,ASMB540A,ASMB540C,ASMB33A,ASMB9.1CA,ASMB350A,ASMB350C,ASMB130CA,ASMB160A,ASMB120A,ASMB,ASMB18CA,ASMB16A,ASMB200A,ASMB56A,ASMB7.5CA,ASMB10CA,ASMB68A,ASMB82CA,ASMB20A,ASMB160CA,ASMB75CA,ASMB33CA,ASMB56CA,ASMB7.5A,ASMB6.8A,ASMB8.2A,ASMB220CA,ASMB15A,ASMB510A,ASMB27A,ASMB39A,ASMB510C,ASMB43A,ASMB550A,ASMB550C,ASMBXXXCA,ASMB110CA,ASMB170A,ASMB82A,ASMB22CA,ASMB130A,ASMB68CA,ASMB250CA,ASMB400A,ASMBXXX,ASMB15CA,ASMB6.8CA,ASMB400C,ASMB440A,ASMB11CA,ASMB250A,ASMB440C,ASMB480A,ASMB30A,ASMB480C,ASMB200CA,ASMB30CA,ASMB520A,ASMB520C,ASMB13A,ASMB170CA,ASMB91CA,ASMB180A,ASMB100A,ASMB27CA,ASMB600A,ASMB36A,ASMB16CA,ASMB600C,ASMB220A,ASMB12CA,ASMB12A,ASMB24A,ASMB120CA,ASMB91A,ASMB58CA,ASMB39CA
3通道TVS阵列SP0503BAHTG用于USB防护时，该如何使用？
3通道TVS阵列SP0503BAHTG用于USB防护时，其公共端接USB的电源地GND，另外3端分别接USB的电源VCC、数据线USB D+和USB D-。
可提升CAN总线的浪涌防护能力的国产TVS、GDT和PPTC
CAN总线具有较强的抗干扰能力，利用TVS、GDT、PTC等元件组成浪涌保护电路，抑制雷击、浪涌、过压等有害信号，全面提升CAN总线的浪涌防护能力。本文推荐硕凯电子的TVS、GDT和PPTC
ASMA系列TVS二极管
描述- 该资料介绍了SETsafe公司的ASMA系列瞬态电压抑制二极管（TVS）。这些二极管用于电路保护，能迅速衰减或过滤过压尖峰。它们具有低增量浪涌阻抗、优异的钳位能力、低剖面封装和内置应力缓解等特点。适用于通信设备、安全与防护、工业控制设备、电源、汽车电子、新能源和防雷等领域。
型号- ASMAXXX,ASMA68CA,ASMA22CA,ASMA440CA,ASMA30A,ASMA510A,ASMA120CA,ASMA350CA,ASMA130A,AMSA550CA,ASMA170A,ASMA30CA,ASMA11CA,ASMA530CA,ASMA15CA,ASMA13A,ASMA400A,ASMA150CA,ASMA440A,ASMA250A,ASMA480A,ASMA7.5CA,ASMA12A,ASMA36A,ASMA24A,ASMA27CA,ASMA9.1CA,ASMA91A,ASMA100A,ASMA,ASMA91CA,ASMA180A,ASMA SERIES,ASMA510CA,ASMA8.2CA,ASMA12CA,ASMA16CA,ASMA39CA,ASMA11A,ASMA200CA,ASMA47A,ASMA51A,ASMA75A,ASMA400CA,ASMA220A,ASMA170CA,ASMA20CA,ASMA43CA,ASMA250CA,ASMA24CA,ASMA47CA,ASMA62CA,ASMA18A,ASMA480CA,ASMA22A,ASMA62A,ASMA10A,AMSA550A,ASMA110A,ASMA300A,ASMA530A,ASMA150A,ASMA160CA,ASMA51CA,ASMA36CA,ASMA13CA,ASMA33A,ASMA220CA,ASMA9.1A,ASMAXXXCA,ASMA110CA,ASMA6.8CA,ASMA16A,ASMA56A,ASMA68A,ASMA20A,AMSA540A,ASMA180CA,ASMA120A,ASMA350A,ASMA100CA,ASMA160A,ASMA10CA,ASMA6.8A,ASMA27A,ASMA15A,ASMA33CA,ASMA56CA,ASMA75CA,ASMA39A,ASMA18CA,ASMA7.5A,ASMA43A,ASMA8.2A,ASMA130CA,ASMA82A,ASMA200A,ASMA82CA,ASMA300CA,AMSA540CA
RS485电路对线芯做浪涌试验，如果设计防护电路？
RS485电路对线芯做浪涌试验，通常需要在接口处增加TVS保护器件，Littelfuse针对浪涌保护推出了一系列TVS管，请参考以下链接：https://www.sekorm.com/news/28157162.html。
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现货市场
服务
可根据用户的MOSFET管进行参数检测出具报告，静态参数最大电压:7500V、检测最大电流6000A；动态参数最大电压:3300V、检测最大电流:4500A。该测试标准满足GB、IEC及行业标准等，具备可靠性评估及老化实验能力。
实验室地址： 西安 提交需求>
可定制LAMP LED、 CHIP LED、 PLCC LED、 汽车用车规级LED、COB LED的尺寸/电压/电流等参数，电压1.5-37V，电流5-150mA，波长470-940nm。
最小起订量： 30000 提交需求>
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