【经验】自恢复保险丝PPTC的七大选用技巧

时间： 2022-10-12 来源：优恩半导体官网

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PPTC——自恢复保险丝，是一种过流保护型器件，不少人还不知道应该如何选择自恢复保险丝，要注意什么事项？本文优恩就将为您介绍自恢复保险丝PPTC的选型注意事项。

一、确保添加的自恢复保险丝不会影响产品电路的正常工作。

二、确定设备线路上的平均工作电流（I）和较大的工作电压（V）。

三、根据环境温度和电流值的下降率计算正常电流Ih。Ih=平均工作电流（I）÷环境温度和电流值的下降率。

四、根据应用的L、V值、产品类别、空间大小及安装方式选择PPTC自恢复保险丝系列。

五、所选自恢复保险丝的较大工作电压和较大故障电流大于或等于电路的较大工作电压和较大故障电流。

六、确定动作时间，即当器件上出现故障电流时保险丝切换到高阻状态所需的时阻状态之前损坏受保护的组件。

七、一般来说，自恢复保险丝的工作温度范围在-40℃到85℃之间间。如果所选元件动作过快，会提前进入保护状态，影响电路的正常工作。如果元件移动太慢，则可能在元件切换到高电。我们应当确保应用的较低与较高环境在保险丝的工作温度范围内。

八、使用时注意其一定的导通电阻。额定电流越大，电阻越小；高压型的电阻要大些。

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本文由犀牛先生转载自优恩半导体官网，原文标题为:PPTC(自恢复保险丝)要知道的七大选用技巧，纯分享，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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优恩半导体（UN Semiconductor）于1994年成立于台湾，专注于ESD静电保护、雷击浪涌保护器件及串口芯片，设有专业的EMC测试整改中心。优恩半导体的ESD、TVS、GDT、MOV、放电管、通信芯片等产品广销全球20多个国家。

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【技术】自恢复保险丝多久熔断？

自恢复保险丝（PPTC）常用于电路的限流保护中，其工作原理是在电路故障发生时立即熔断，以避免电路的进一步损坏。本文优恩半导体将介绍自恢复保险丝多久熔断？

技术探讨发布时间 : 2023-05-13

【技术】浅析PPTC自恢复保险丝在RS485通讯接口的应用

众所周知，PPTC自恢复保险丝是使用极为广泛的一种过流保护元器件，在一些笔记本电脑、汽车电子、以及变压器、工业控制设备，当然，也包括一些通讯接口，PPTC都能起到过电流和过温保护的作用。浅析PPTC自恢复保险丝在RS485通讯接口的应用。

技术探讨发布时间 : 2022-10-17

优恩半导体PPTC自恢复保险丝选型表

优恩半导体提供如下技术参数的PPTC自恢复保险丝选型：保持电流0.01A~14A；动作电流：0.03A~23.8A；最大电流：1A~100A，最大额定电压：6V~72V。产品符合rohs标准，小封装为电路板节省了电路板空间。

产品型号	品类	Hold Current I hold (A)	Trip Current I trip (A)	Rated Voltage （V） max Vdc	Max Current I max(A)	Typical Power P dtyp.(W)	Maximum Time To Trip Current (A)	Maximum Time To Trip Time (Sec.)	Resistance R min(mΩ)	Resistance R max(mΩ)
SMD0603-001	Surface Mount Resettable Polymer PTCs	0.01	0.03	60	20	0.50	0.20	1.00	15.00	100.0

选型表 - 优恩半导体立即选型

【技术】关于保险丝常识的有效问答（一）

目前保险丝种类比较常见的就是自恢复保险丝PPTC与一次性保险丝了，关于保险丝呢，不少客户对它也存在很多疑问，本文优恩半导体对此整理出了三个基本常识的有效问答，希望能帮到大家。

技术探讨发布时间 : 2023-01-18

【技术】解析贴片自恢复保险丝的主要缺陷

PPTC自恢复保险丝有插件式与贴片式，这两种保险丝或多或少都存在一些缺陷，本文优恩半导体就将为您介绍贴片自恢复保险丝的主要缺陷。实际上，贴片自恢复保险丝比较大的一个缺陷点是它不能够代替快速熔断器。

技术探讨发布时间 : 2023-01-14

优恩半导体（UNSEMI）ESD静电保护/雷击浪涌保护器件/串口芯片产品选型指南（英文）

目录- Company Introduction ESD Protection Diodes（ESD） Transient Voltage Suppressor（TVS） Thyristor Surge Suppressors（TSS） Sidac Thyristor（SIDAC） Metal Oxide Varistors（MOV） Gas Discharge Tube（GDT） Spark Gap Protectors（SPG） Micro Surge Protection Module（Micro-SPD） Polymeric Positive Thermal Coefficient（PPTC） RS485/422 Transceiver CAN Transceiver RJ45 Modular Jack connectors Small signal devices EMI Protection devices

型号- SMDJ-AT SERIES,UNS3K,07DXXKJ,UN2E8-XXXML SERIES,SMBJ,UN2E5-XXXLL SERIES,40DXXK SERIES,UN232,UN2E8-XXXL HV,4.0SMF SERIES,UN1812-XXXCSMD SERIES,10DXXKJ,5.0SMDJ-AT SERIES,P6KE SERIES,30KP SERIES,SACB SERIES,UNS1K SERIES,PXXXSC SERIES,P4KE,SMD0603 SERIES,10DXXK SERIES,10DXXKEC SERIES,UN490E,UN3E8-XXXHP,UNSDC12V-3L,07DXXK,07DXXL,UN3E5-XXXMSMD,20DXXK SERIES,PXXXSB,15KPS,PXXXSA,PXXXSB-2L,P4SMA SERIES,SA SERIES,SMAJ,UN2220 SERIES,05DXXKJ,SAC SERIES,SMF SERIES,PXXXSC,KXXXSA SERIES,20KP,5.0SMDJ SERIES,0402 SERIES,20KP SERIES,TPSMAJ SERIES,PXXXLB SERIES,SMCJ SERIES,UN3490,P4SMA,UNSDC24V-3L,SMDJ,UNS1K,UN3E6-XXXMM,UN65HVD75,UN2E8-XXXL HV SERIES,SMDT,UN1812 SERIES,UN3220 SERIES,1.5SMC,SA,UN2E8-XXXML,UNS4032 SERIES,UN2E8-XXXHL SERIES,UN2E5-XXXL HV,UNSDC58V-2L,SMD1210 SERIES,PXXXSD1,UN2E5-XXXLSMD,PXXXEC SERIES,UN3485,UN16,5KP,1.5KE SERIES,TP5.0SMDJ,14DXXL SERIES,07DXXKBC SERIES,UNS2K,UN2E8-XXXMSMD,UN2E5-XXXLL HV SERIES,10DXXKEC,UNSDC24V-2L,32DXXL SERIES,14DXXKJ SERIES,UN3E8-XXXHM SERIES,SMCJ,TPSMB SERIES,UN1210-XXXBSMD SERIES,UN3E6-XXXM,TPSMDJ SERIES,UN65HVD233,UN65HVD234,UN65HVD232,UN65HVD230,SMBJ-AT,UN2E5-XXXL,UN2E8-XXXM,UN1210-XXXBSMD,10DXXKJ SERIES,34SXX,KC SERIES,UN2E6-XXXLSMD SERIES,UN2E8-XXXH,UNB-XXXN-SMD,UN3E8-XXXHMF,32DXXKJ SERIES,UN1050,UN3232E,UNA-XXXM-SMD,UN1050ISODUB,PXXXG,32DXXKJ,40DXXK,UNS3220,UNB-XXXM-SMD,40DXXL,UN3085NE,SMCJS,UN2E8-XXXHSMD,TPSMB10J,32DXXK,32DXXL,PXXXEC,UN30,PXXXEB,PXXXEA,30KP,P6SMB SERIES,PXXXSC-2L SERIES,15KP,PXXXSC-2L,0603,SMD2920 SERIES,10SMBT,14DXXKJ,UN82C250,UNSRS485-2HL,UN82C251,10SMBJ,05DXXL SERIES,25DXXL SERIES,TPSMC SERIES,UN2H8-XXXL HV SERIES,UNSDC58V-3L,SM8Z SERIES,TPSMCJ SERIES,SM5Z,UN6,UN3E5-XXXL,UN3088E,KXXXG SERIES,PXXXTB,PXXXTA,UN2E5-XXXLSMD SERIES,KA SERIES,UNB-XXXN-SMD SERIES,UN3088ES,07DXXL SERIES,5KP SERIES,UN3485ISO,8KP SERIES,PXXXEA SERIES,UNA-XXXN/M SERIES,SMCJS SERIES,3KP,SM8Z,UN3E5-XXXLM,SMCJ-AT SERIES,LCE SERIES,UNC-XXXN/M SERIES,PXXXSA SERIES,UNSRS485-2H,SMCJ-AT,25DXXKJ SERIES,UN0805 SERIES,PXXXDM,POE58C,15SMBJ,PXXXTB SERIES,PXXXSB-2L SERIES,UNA-XXXN-SMD,40DXXKJ SERIES,UNS3220 SERIES,UN1206 SERIES,P4KE SERIES,SM5Z SERIES,UN2E8-XXXMSMD SERIES,UN3E6-XXXMM SERIES,05DXXK,05DXXL,UN600 SERIES,1012 SERIES,UNB-XXXN/M SERIES,8.0SMDJ,UNSRS485-2L,P6SMB,SACA SERIES,40DXXKJ,40DXXL SERIES,PXXXDM SERIES,SACA,UN0603 SERIES,SACB,UN2E5-XXXL SERIES,UN2H8-XXXLL HV SERIES,SMD2920,0402,8.0SMDJ SERIES,25DXXL,25DXXK,UN30 SERIES,10DXXL SERIES,20DXXL SERIES,25DXXKJ,5KPS,UNA-XXXN-SMD SERIES,UN485E,UN2E8-XXXHL,PXXXSB SERIES,UN485ES,PXXXTA SERIES,UN3E8-XXXHMF SERIES,UN2H8-XXXLL HV,SMDJ-AT,4.0SMF,SMF,TPSMB10J SERIES,0603 SERIES,5KPS SERIES,UN2E8-XXXH SERIES,KD SERIES,UN60,SMAJ-AT SERIES,TPSMDJ,UN1206-XXXASMD SERIES,UN2E8-XXXHSMD SERIES,UN3232E-T,UN1210 SERIES,14DXXKSC,07DXXKBC,10DXXK,UNSDC48V-2L,10DXXL,53DXXK,UN3E8-XXXHSMD SERIES,2012 SERIES,UN0805,UN3E5-XXXMSMD SERIES,KA,KB,UN1812-XXXCSMD,KC,TPSMCJ,UN2E8-XXXLL HV,KD,6.0SMAJ SERIES,14DXXKSC SERIES,UNS2K SERIES,10SMBJ SERIES,TP5.0SMDJ SERIES,SMD1812 SERIES,UN60 SERIES,5.0SMDJ,UN3490E,UNSDC48V-3L,20DXXKYC SERIES,SMD0603,SMD1812,KXXXSB SERIES,UN1206,UN16 SERIES,SMBJ SERIES,UNSRS422-2H,SMDT SERIES,UN1210,UNSRS422-2L,UN135 SERIES,TPSMBJ,PXXXLC SERIES,UNS4032,0201 SERIES,UN1206-XXXASMD,UN2H8-XXXL HV,5.0SMDJ-AT,UN3E5-XXXL SERIES,20DXXKYC,UN3485S,UN3E6-XXXM SERIES,34SXX SERIES,UN2E5-XXXLL,05DXXK SERIES,0201,UN3E8-XXXHP SERIES,UN3E8-XXXH SERIES,UN1042,UN3220,TPSMAJ,UN1040,UN2E8-XXXLL HV SERIES,15KP SERIES,8KP,UN2E5-XXXL HV SERIES,UN2E6-XXXLSMD,6.0SMAJ,UN3E8-XXXHSMD,32DXXK SERIES,34SXXJ SERIES,SMD1206 SERIES,SMBJ-AT SERIES,TPSMA SERIES,UNC-XXXM-SMD,LCE,UN600,14DXXK,UN6 SERIES,14DXXL,UNC-XXXN-SMD SERIES,UNSRS422-2HL,15SMBJ SERIES,SAC,SMD0805 SERIES,SMAJ SERIES,UN3E5-XXXLM SERIES,UN3E5-XXXLSMD SERIES,UN250 SERIES,UN3E8-XXXH,UN485CUA,UN488E,UN250,KB SERIES,PXXXLC,UN2E5-XXXLL HV,UN135,PXXXLB,PXXXLA,07DXXK SERIES,SMD1206,UN0603,UN1812,20DXXL,20DXXK,PXXXEB SERIES,10SMBT SERIES,1.5KE,14DXXK SERIES,UNC-XXXN-SMD,05DXXKJ SERIES,3KP SERIES,P6KE,07DXXKJ SERIES,UNS3K SERIES,KXXXSD1 SERIES,TPSMC,SMD0805,25DXXK SERIES,TPSMB,TPSMA6J SERIES,TPSMA,TPSMBJ SERIES,34SXXJ,20DXXKJ,SMD1210,20DXXKJ SERIES,SMDJ SERIES,UN2220,UN2E8-XXXM SERIES,TPSMA6J,UNSDC12V-2L,1.5SMC SERIES,15KPS SERIES,SMAJ-AT,PXXXLA SERIES,UN3E5-XXXLSMD

选型指南 - 优恩半导体 - 2021 PDF 英文下载