【技术大神】压敏电阻和放电管在电源防护中的应用
在我们设计一款安防设备电源时,由于安防设备放在户外,必须要抵御雷击的干扰,因此在设计安防产品的电源时必须考虑雷击浪涌的影响。在最初设计的电源产品中无防护措施,因此经过一个夏季损坏了不少,此时才发现电源浪涌防护及其重要性。
在后来的方案优化中,我们找到了LITTELFUSE,一个国际化的大厂家。或许在很多工程师的认知中Littelfuse是专注于各类防护器件的,但在笔者了解后发现其实压敏电阻和放电管也是Littelfuse做得比较好的产品。根据我们产品工业四级浪涌电流需求,选取了LittelFuse的C-III型压敏电阻,直径选取14mm,电压选取460VAC,放电管选取了1000V的管子CG3 1.0,通流能力可达到5KA,详细的电源防护图如图1所示。
图1:电源防护图
从图1可以看出,整个电路过程是:电源220V从IN1+和IN1-输入,经差共模防护器件,然后经过保险丝到EMI滤波,再到电源模块。浪涌电压同时施加在IN1+和IN1-上面。差模干扰主要通过VAR14的压敏电阻进行释放,VAR14应选取大于220*1.414VDC值,不然上电后会短路。共模干扰L、N主要通过VAR13、VAR12以及DTD4泄放到大地。设计共模防护时,由于压敏电阻的漏电流很大,通常大于10mA的安全漏电流,因此通常会通过压敏电阻+气体放电管的设计来进行共模防护。此设计气体放电管的通流能力大,阻抗可以达到几吉欧姆,漏电流非常小,可有效满足漏电要求。
根据上面设计的PCB进行试验,安防设备正常工作情况下对输入端施加8/20uS的雷击浪涌波形,电压为4KV,施加差模,共模共计三十次,测试时间间距为30S。试验发现设备工作正常,电压模块无损坏情况,电路中也无打火的情况。另外,笔者尝试拆掉前面的防护器件,发现后级的电源模块会在共模情况下出现重启的情况。自此,在实验室的测试基本能够满足模拟室外的情况,后续机器损坏的概率大大的降低。
以下是笔者在整个设计中为了有效的设计电源防护电路及其选型得出的一些经验和注意事项:
1)国际大品牌的Littelfuse防护器件的,是值得信赖的产品,通过压敏+放电管能够有效的解决电源模块重启以及损坏问题。
2)在共模压敏电阻选型时,电阻值应大于持续工作电压的1.414倍,以避免上电短路的情况。
3)在选取压敏电阻和放电管时,应满足8/20us电源浪涌波形,大于2KA的通流能力,并且要留够50%的余量。
4)在共模设计时,有时候需要经过绝缘耐压测试。绝缘耐压和浪涌本是一个矛盾的关系,在无绝缘要求的情况下,压敏+放电的值取得小些为好,最好为输入电压的1.414倍。如果有绝缘耐压的电压需求,例如绝缘要求1.5kVAC,压敏+放电管之和的值需大于1.5KV,并且要留有余量。
5)在PCB板设计时,输入的共模防护电路中,对地的压敏+放电管的泄放通路越短越好,能够保证大的能量快速泄放。
6)一般情况下防护器件放在保险丝之前,可避免大电流烧坏保险丝。
有了上述选型和防护经验,加上高大上的Littelfuse的防护器件,电源的防护也就迎刃而解了。
作者:国电南网 吴工
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Littelfuse提供工业金属氧化物压敏电阻(MOV),以解决工业环境中的过压瞬变问题。其主要用于感应闪电浪涌或用于调节由电机本身产生的瞬变。 这些情况要求MOV额定值与相应位置发生的的浪涌相匹配,具有适当的高能量和浪涌电流值。 本文说明了关于应用于工业交流线路的Littelfuse金属氧化物压敏电阻的重要注意事项,并给出了电机保护示例。
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目录- 过压抑制 压敏电阻特性/术语/考量因素 压敏电阻连接示例 压敏电阻选择工作表 机构标准/免责声明 表面贴装式多层压敏电阻 径向引线式压敏电阻 工业高能端子压敏电阻 轴向引线型/专用型压敏电阻 薄型/专用型压敏电阻 高可靠型压敏电阻 TMOV®和iTMO系列 工业高能热保护压敏电阻 热保护压敏电阻 FBMOV系列
型号- V05E40P,V18MLA0805L,V18MLA0805N,V18MLA0805F,V385LA10CP,V220CH8 X,V575LA10P,V05P40P,VXXXDA40,V18MLA1210NHAUTO,V18MLN41206,TMOV14RP575E,V14H95P,V660LA100BP,TMOV34S201 EP,V10E250AUTO,TMOV34S461M,V130LA10C,V150LA20BP,TMOV14RP575M,V130LA10A,V681HG34,V10P130P,V142CA60,V270ZA05,V510LA40CP,V68ZA10P,V660LA100CP,TMOV34S661MP,V07P00P,V14H130P,V150LA20AP,V111HG34,V14P17AUTO,SMOV34S131MP,V05X50AUTO,V130LA20CP10,V22ZTX1,V3.5MLA1206,V22ZTX3,V140LA5,V47ZA7,V18RA8,V47ZA3,SMOV34S251MP,V47ZA1,V14P275P,V25S440P,V20X23P,V140LA2,V391HF34,V230LA40C,V3.5 MLA0603,TMOV34S421MP,SMOV34S131NP,V20P23AUTO,V30MLA0603,TMOV34S681M,SMOV34S251NP,V175LA20C,V230LA40A,V271HG34,V175LA20A,V20E35AUTO,V510LA40AP,TMOV34S111M,V12MLA0805L,V24RA22,V181HG34,V29MA2A,V480LTX40A,V360ZA05,V120CH8,V18ZA40PX10,V20P510P,V575LA10CP,Y9MLA0805LN,TMOV34S301MP,V18MLA0805LN,V150LA5P,RA22,V14P40P,V14P140P,V39ZA3P,V20X130P,V20E460AUTO,V20P175AUTO,V20P5AUTO,V14E40P,V625LA40A,V141DHB34,V441DHB34,TMOV34S331M,V460LA80CP,V10E30AUTO,V25S130P,V180ZA05,V321DB40,RA16,V56ZA20P,TMOV14RP750E,V3.5MLA0603NHAUTO,V481HF34,V10P150AUTO,TMOV14RP750M,V20E250P,V625LA80BP,V07E150P,V190SM7,V47ZA20P,V130LA20CX325,V20E625,V351DHB34,V05X25AUTO,V320LA40BP,TMOV34S201M,V180ZA10,V151CA32,V10P625AUTO,V14H175P,V30MLA0805LNHAUTO,V39ZA6P,V321HF34,V275LA10CP,V20E17AUTO,V481DB40,V200RA16 X2749,V8ZA1,V8ZA2,V20H320P,V20E275AUTO,V625LA80CP,V300LA40CX810,V10E14AUTO,V150LA2P,V571HF34,TMOV34S551M,V20P60P,V320LA40CP,V20E300AUTO,V14P85P,V20E60P,V20X20P,V180ZA20,V180ZA1P,V07E20AUTO,V82ZA05P,V251HB34,V20E550AUTO,V460LA10CP,V39ZA05,V10P440P,MA SERIES,V25S175P,V14H440P,V10E440P,V18MLA1206NHAUTO,V24ZTX50,VARISTOR,V575LA80CP,V100MA4B,1-2000B,V100MA4A,SMOV34S621MP,SM7,V250LA40CX620,V100MA,V26MLA1210NHAUTO,SMD,V0603MHS22F,V0603MHS22N,V230LA20CP,TMOV25SP130E,V10H40P,SMOV34S621NP,TMOV25SP130M,V14P320P,V20H25P,V230LA4,V120MLA1210N,V14MLA0805NHAUTO,V39ZA20,V39ZA1P,V551HF34,V571DB40,V0402MHS22NR,V881CA60,V330ZA05P,V430ZA05,V230LA40CP570,TMOV34S421EP,V120MA2S,V180ZA5P,V18MLN41206LWT,V20E60AUTO,V20X75AUTO,V07P7AUTO,V460SM7,V5.5MLA0603L,V480LTX80B,V5.5MLA0603N,V130LTX20B,V480LA10P,V18MA1B,V45MLA1812N,V14P85AUTO,V18MA1A,V14P42AUTO,TMOV34S151M,V230LA20AP,V20E385P,V575LA80BP,V07P320P,V20P550P,V18MA1S,V48MLA1210NHAUTO,V18ZT3P,V10H510P,V142BB60,V07X50P,V10E35P,V20X30AUTO,V20E140AUTO,V120MA1A,V150LA20C,V150LA20B,V150LA20A,TMOV34S301EP,V10E75AUTO,V14P40AUTO,V680ZA05,V661HB34,V33RA16,V05P50AUTO,175SM20,V130LA10AP,V07E460P,V200RA8,V275SM7,V20E320AUTO,V511DHB34,TMOV14RP625E,V120MA2B,V18MLA1210N,V48MLA1210LNHAUTO,TMOV14RP625M,V680LA10CP,V14X95P,V481HB34,V120MA1S,V20P14AUTO,V510SM7,V14P35AUTO,V14E440AUTO,V18MLA1206XXX,TMOV25SP175E,V18ZC3P,V07P75AUTO,V130LA10CP,TMOV25SP175M,V20P420P,V420LTX40B,V201HG34,V14E150P,V20P7AUTO,V07X95P,V271BA60,V751BA60,V100MA4S,V14P230P,V750ZA05P,V10P35P,V10P00AUTO,V251HF34,V20X60P,V300LA4,V300LA2,V240ZA05P,V82ZA4P,V301HF34,V10E25AUTO,V14E275AUTO,V14X17AUTO,V10P30P,V26MLA1206NHAUTO,V20E300P,V56MA2S,V10X25AUTO,V180ZA1,TMOV25SP440E,TMOV34S141MP,V10E30P,V180ZA5,V421DA40,V18MLN41206L,V05X30AUTO,V14X50P,TMOV25SP440M,V05E30AUTO,V282CA60,V82ZA5P,V68MLA1206,V250LA40CP620,V05X14AUTO,V18MLA0402F,V20H30P,V10E130P,TMOV34S511EP,V14E25AUTO,V750ZA05,V661BA60,SMOV34S,SM20,V56MA2B,V9MLA0402,V10H420P,V56MA2A,V07P140P,V07X17AUTO,V230LA40CX570,V20P25P,HF 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描述- 本资料为Littelfuse公司提供的电路保护产品快速参考指南,涵盖了连接器和保护元件的多种类型。内容包括不同类型的连接器(如USB、AC端口、以太网等)以及相应的保护元件(如PolySwitch、LVR设备、PESD设备等)。资料详细介绍了各类产品在不同电路中的应用,旨在帮助用户选择合适的保护解决方案。
型号- LVR100K-240-AP,SESD,RF2943-000,LVR,TM2P-10271-2,2PRO,LVR016S,LVR125S,SESD0802Q4UG-0020-090,LVR012K-2,PESD,LVR200K-240-AP,LVR012S-1,LVR012S-2,RF2945-000,SESD0201X1BN-0015-096,LVR016K,LVR008NS,LVR033K-2,LVR075S-240,RF3923-000,PESD0402-240,LVR100S-240-AP,SESD1004Q4UG-0030-088,LVR008NK,LVR033S-2,LVR125K-240,SESD0402Q2UG-0030-088,RF3917-000,LVR055K,LVR200K-240-2,LVR100S-240,SESD0201X1UN-0030-088,LVR100S,RF3076-000,LVR055S,RF2193-000,SESD1103Q6UG-0020-090,PESD0603-240,LVR100K-240-2,LVR125K-240-2,LVR200S-240-AP,LVM2P-035R14431,SESD0402X1UN-0030-088,LVM2P-015R10431,RF3920-000,LVR200S,RF3078-000,LVR008NS-1,LVR008NS-2,SESD0201X1BN-0010-098,LVM2P-075R14431,LVR100S-240-2,LVR008NK-2,LVR005NS,RF3925-000,LVR005NK,LVR033K,SESD0402Q2UG-0020-090,TM2P-10271,SESD1004Q4UG-0020-090,LVR200S-240,LVR033S,LVR040S-1,LVR100K-240,LVR200K-240,LVR040S-2,RF3918-000,LVR075K-240-2,LVR125S-240-2,SESD0402X1BN-0015-096,PESD1206Q-240,LVR025K-2,LVR040K,LVR012K,LVR025S-2,LVR040S,LVR040K-2,LVR012S,SESD0402X1UN-0020-090,LVR016S-2,LVR016S-1,LVR075S-240-2,LVR016K-2,LVR125S-240,RF3077-000,LVR075K-240,LVR075S-240-AP,LVR075S,LVR075K-240-AP,RF3922-000,LVR005NK-2,SESD0402X1BN-0010-098,RF2192-000,LVR055S-1,LVR075S-1,LVR055S-2,LVR075K-1,LVR005NS-1,LVR005NS-2,LVR125K-240-AP,LVR125S-240-AP,RF2946-000,LVR200S-240-2,PESD0402-140,LVR025K,SESD0201X1UN-0020-090,LVR025S
【元件】力特推出SM10系列压敏电阻,可承受高达125℃,在汽车与电子产品浪涌保护方面取得突破性进展
Littelfuse公司宣布推出SM10压敏电阻系列,这是一款革命性的金属氧化物压敏电阻(MOV),旨在为汽车电子器件、电动汽车(EV)以及其他各类应用提供卓越的瞬态浪涌保护。这款最新产品是首款符合AEC-Q200汽车标准的表面贴装MOV器件,能够承受高温工作,并以紧凑封装提供超高的浪涌电流处理能力。
Littelfuse(力特) 最专业最齐全的全球领先保护器件
描述- Littelfuse公司简介:全球领先的电路保护企业,提供广泛且尖端的电路保护产品及解决方案。公司成立于1927年,全球拥有7500员工,2014年全球销售额865亿美元,全球分布有35个联络处。公司产品涵盖消费电子产品、汽车、商用车辆和工业设备等多个领域,提供针对不同应用需求的解决方案。 主要产品介绍:Littelfuse提供过流保护器件(保险丝、自恢复保险丝)、过压保护器件(瞬变抑制二极管、压敏电阻、气体放电管、SIDCtor保护晶闸管、聚合物ESD抑制器)、开关型晶闸管、LED保护器、簧片开关和磁簧传感器等。 重点市场及主推型号介绍:涵盖消费/通信、工业汽车等多个市场,提供多种型号的产品以满足不同需求。例如,过流保护器件中的保险丝和自恢复保险丝,过压保护器件中的瞬变抑制二极管和压敏电阻等。
型号- 1.5SMC540CA,SMBJ,1812L,SMBJ8.5CA,5KP200A,SMBJ51A,SMBJ75A,SMBJ70CA,SG75,SL1411A600A,PLED 5 QFN,5KP40A,5KP64A,AC,1812L020PR,SMBJ40A,SMBJ17CA,SMBJ64A,1.5SMC200CA,1.5SMC36CA,5KP18CA,1.5SMC13CA,5KP51A,5KP75A,SMBJ160CA,0312005.MXP,0456040.DR,5KP8.5CA,K1500GRP,1812L110/33MR,SMBJ85A,SMBJ28CA,5KP160CA,CG3,K2200G,5KP78A,1.5SMC510A,60R110XU,5KP,5KP28CA,SMBJ300A,5KP30A,CG35.0,5KP54A,SMBJ150CA,MDCG-4,1206L012WR,1206L110WR,1.5SMC8.2CA,SMBJ16CA,1812L150/12DR,5KP70CA,5KP17CA,CG35.0LTR,5KP180CA,CG32.0,K1100GRP,5KP60A,1.5SMC7.5CA,SMBJ170CA,1.5SMC27CA,SMBJ400A,K1200E70,1.5SMC91CA,SMBJ60A,SMBJ15CA,1.5SMC180CA,1.5SMC400A,5KP16CA,1.5SMC15CA,1.5SMC9.1CA,1.5SMC6.8CA,SL1411A800A,SMBJ26CA,SMBJ400CA,1.5SMC300A,60R050X,60R,5KP26CA,SMBJ90CA,1.5SMC300CA,SL1411A800,1.5SMC530CA,60R010XU,SMBJ70A,SMBJ14CA,1.5SMC530A,5KP170CA,60R075X,60R160X,5KP15CA,5KP85A,1.5SMC16CA,1.5SMC39CA,SM24CANA-02HTG,60R090XPR,1.5SMC82CA,SMBJ48CA,60R300X,1.5SMC200A,5KP12A,5KP36A,5KP24A,5KP48A,1.5SMC36A,1.5SMC24A,1.5SMC12A,0452002.,5KP48CA,5KP200CA,1.5SMC510CA,K2200SRP,SMBJ130CA,SM24CANA,5KP6.5CA,5KP90CA,1.5SMC11A,SMBJ13CA,1.5SMC540A,5KP190CA,SMBJ36CA,5KP11A,1.5SMC47A,0456030.ER,1812L075/33DR,5KP14CA,SL1411A,048502.5,SMBJ24CA,1.5SMC440A,1812L050PR,5KP14A,1.5SMC170CA,5KP26A,CG31.5LTR,CG31.5,5KP24CA,SMBJ90A,SMBJ12CA,1.5SMC400CA,1.5SMC550A,SMBJ58CA,5KP13A,SMBJ188CA,1.5SMC13A,SMBJ350CA,0452001.,1.5SMC18CA,5KP8.0CA,5KP13CA,5KP36CA,AC120,SMBJ5.0A,1.5SMC220A,1812L150/24,0312.062MXP,048502.5DR,K2400G,SMBJ180A,1.5SMC16A,312,SL1411A470A,1.5SMC150CA,5KP20A,1206L035YR,045803.5,1206L050/15YR,5KP100CA,SMBJ11CA,1.5SMC100A,V05E17P,SL1411A090,5KP7.5CA,1.5SMC39A,1.5SMC27A,1.5SMC15A,5KP190A,K1500SRP,5KP210CA,K1500E70,0452007.,5KP12CA,5KP58CA,5KP43A,1.5SMC62CA,SMBJ22CA,SMBJ45CA,CG32.0LTR,452,5KP22A,1.5SMC18A,5KP58A,SMBJ170A,SMBJ10CA,456,458,LV ULTRAMOV,K1500,1206L150PR,60R090X,5KP22CA,5KP45CA,5KP10A,K1200G,5KP5.0A,CG31.01,1812L200DR,SMBJ6.0A,1.5SMC110A,SMBJ33CA,SMBJ250CA,5KP45A,1206L150THWR,5KP33A,5KP9.0CA,5KP180A,5KP11CA,SL1411A350A,1.5SMC160CA,0452005.,SMBJ5.0CA,5KP6.0A,60R110XMR,SMBJ220CA,1.5SMC250CA,1.5SMC480CA,5KP110CA,60R075XPR,045602.5,SMBJ160A,0456030.,1812L200THPR,5KP6.0CA,1.5SMC51CA,K2200GRP,1.5SMC120A,1.5SMC75A,SMBJ78CA,1.5SMC51A,SG300,1.5SMC350A,60R110X,5KP10CA,SMBJ43CA,5KP170A,SMBJ20CA,1.5SMC9.1A,1812L110,5KP33CA,0458007.DR,SMBJ7.0A,1.5SMC30A,1.5SMC480A,1.5SMC,1206L160ZR,1.5SMC250A,TMOV25SP115E,5KP20CA,5KP43CA,SMBJ54CA,SG,SMBJ18A,1812L075/24DR,5KP220CA,1812L010DR,0456040.,1206L200,SMBJ150A,1206L050YR,1.5SMC75CA,60R160XF,0458007.,0452007.MRL,SMBJ6.0CA,1.5SMC130A,5KP160A,K2000F1,SMBJ100CA,1.5SMC7.5A,1.5SMC8.2A,1812L050/30PR,1.5SMC6.8A,5KP78CA,0452001.MRL,0456020.ER,1.5SMC20A,SMBJ6.5A,5KP7.0CA,5KP16A,SMBJ16A,SMBJ30CA,1.5SMC68A,5KP28A,SMBJ28A,1.5SMC56A,5KP6.5A,1812L200,SMBJ188A,K1200,5KP7.0A,SMBJ8.0A,1.5SMC30CA,1.5SMC43A,5KP150A,SMBJ440CA,5KP54CA,SMBJ64CA,60R300XF,5KP15A,K2400,SMBJ17A,1812L300MR,1.5SMC350CA,1206L110,SMBJ250A,SMBJ120CA,1.5SMC43CA,5KP8.0A,1.5SMC20CA,1.5SMC22A,1.5SMC10A,5KP250A,5KP64CA,SMBJ14A,SMBJ75CA,SMBJ26A,5KP18A,1812L300,0456020.,SMBJ110CA,0458001.,SMBJ7.0CA,K1100,SMBJ130A,1.5SMC130CA,0312002.MXP,SL1411A470,SL1411A350,1206L016,SMBJ7.5A,1.5SMC33A,5KP120CA,1.5SMC150A,SMBJ40CA,5KP30CA,SMBJ15A,5KP17A,1206L012,1206L075/13.2WR,K1500G,SMBJ9.0A,045803.5DR,0312035.MXP,SMBJ12A,SMBJ51CA,60R185X,5KP40CA,SMBJ36A,SMBJ24A,SMBJ48A,0452002.MRL,MDSR-10,SMBJ350A,1.5SMC110CA,SMBJ120A,1.5SMC91A,TMOV25S,SMBJ6.5CA,60R030XU,5KP130A,0312002.,1.5SMC160A,5KP75CA,1206L150,SMBJ13A,SMBJ85CA,K2200,1206L035,5KP7.5A,0456025.,1812L075,5KP250CA,SMBJ8.0CA,K2400SRP,1.5SMC22CA,SMBJ8.5A,0452005.MRL,5KP130CA,1.5SMC82A,60R030X,1206L160,SMBJ22A,60R250XF,5KP85CA,SMBJ58A,K2400E70,5KP70A,SMBJ110A,5KP8.5A,1.5SMC68CA,SL1411A600,SMBJ300CA,1.5SMC170A,1.5SMC33CA,1.5SMC10CA,1206L075THYR,5KP9.0A,5KP120A,1206L016WR,SMBJ10A,1206L050,1812L050,0456025.ER,5KP51CA,SMBJ11A,0312005.,SMBJ220A,SMBJ180CA,1.5SMC56CA,1.5SMC120CA,KXXXZY,1206L,K2000E70RP3,SMBJ43A,5KP220A,SMBJ7.5CA,1.5SMC440CA,60R250X,0458001.DR,SMBJ100A,1.5SMC550CA,1.5SMC180A,1.5SMC11CA,5KP5.0CA,5KP110A,SMBJ20A,5KP150CA,SMBJ45A,SMBJ33A,K2000,SMBJ9.0CA,1206L200PR,SMBJ60CA,0458001.DRA,1.5SMC100CA,1206L075,1812L150,SMBJ440A,5KP90A,0312035.,1.5SMC62A,SMBJ200CA,5KP210A,SM24CANA-02,SMBJ78A,60R010X,5KP60CA,60R050XPR,1.5SMC47CA,1.5SMC24CA,1812L020,60R185XF,SL1411A090C,0312.062,SMBJ30A,SMBJ18CA,1.5SMC220CA,5KP100A,SMBJ54A,0312.187,1812L110/16DR,SMBJ200A,1.5SMC12CA,1812L010
Littelfuse(力特) ZA压敏电阻系列数据手册
型号- V150ZA8P,V82ZA4P,V33ZA70P,V36ZA20P,V120ZA6P,V715ZA05P,V750ZA05PX2855,V22ZA05P,V33ZA5P,V150ZA05P,V18ZA1P,V100ZA15P,V680ZA05P,V68ZA05P,V24ZA50P,V82ZA20P,V180ZA05P,V220ZA05P,V68ZA10P,ZA,V22ZA1P,V150ZA20P,V620ZA05P,V56ZA3P,V100ZA4P,V18ZA20P,V180ZA20P,V47ZA1P,V82ZA2P,V27ZA4P,V33ZA20P,V120ZA4P,V750ZA05PX1347,V39ZA1P,V22ZA2P,V100ZA3P,V100ZA05P,V18ZA3P,V39ZA20P,V18ZA40PX2855,V56ZA2P,V24ZA20P,V330ZA05P,V430ZA05P,V180ZA5P,V68ZA20P,V270ZA05P,V390ZA05P,V100ZA20P,V22ZA3P,V39ZA05P,V33ZA05P,V18ZA2P,V18ZA40PX10,V47ZA7P,V36ZA80P,V39ZA3P,V150ZA4P,V8ZA2P,V27ZA20P,V27ZA1P,V27ZA60P,V56ZA8P,V82ZA12P,V27ZA05P,V18ZA40P,V33ZA2P,V56ZA20P,V8ZA1P,V33ZA1 P,V27ZA2P,V68ZA3P,V12ZA1P,V47ZA20P,V205ZA05P,V360ZA05P,V56ZA05P,V39ZA6P,V12ZA05P,ZA SERIES,V120ZA20P,V18ZA05P,V68ZA2P,V470ZA05P,V120ZA05P,V12ZA2P,V39ZA20PX10,V120ZA1P,V150ZA1P,V750ZA05P,V180ZA1P,V82ZA05P,V180ZA10P,V47ZA3P,V8ZA05P,V240ZA05P,V47ZA05P,V22ZA3PX1347
【应用】Vrwm为15V!这款保护器件大幅度超出ESD标准
Vrwm为15V,大幅度超出ESD测试标准,具有更强的保护能力,且设计简单。
为什么用氧化锌压敏电阻MLV替代TVS齐纳二极管?
氧化锌压敏电阻MLV可以更大可能的减小PCB的尺寸,同时也为一些有特殊要求的设计提供了可能,是替代TVS型齐纳二极管的理想选择。
正温度压敏电阻TMOV20RP175M和普通的压敏电阻有何区别?
正温度压敏电阻TMOV20RP175M内含有一个正温度的保险丝,当浪涌电流非常大会造成压敏电阻失效短路,这时正温度保险丝会被熔断,不会影响到后级电路安全,而普通的压敏电阻则不具备这种功能。
【产品】Littelfuse符合UL和CSA认证的LRU系列保险丝减压器,适用于通信设备、工业电子、汽车电子等
Littelfuse推出的LRU系列保险丝减压器,允许将较小尺寸的保险丝安装到现有的保险丝夹中,以防止过度熔断,广泛应用于通信设备、工业电子、汽车电子、消费电子等领域。
【选型】力特全新压敏电阻四种系列等你选择
力特(Littelfuse)提供了四个系列的压敏电阻,包括MA系列轴向引线式压敏电阻、RA系列小尺寸压敏电阻、C-III系列高能径向引线式压敏电阻和FBMOV系列无碎片热保护压敏电阻,均无铅、无卤素且浪涌能力强,可以广泛的应用于汽车、电机控制等领域中的过热、过流保护。
压敏电阻TMOV34S有哪些特点?
TMOV34S及UltraMOV系列压敏电阻可以用更小的磁盘尺寸提供更大的额定浪涌,是小型直流电压应用最理想的电路保护解决方案。最大额定峰值电流可达8kA(8/20us浪涌),能满足包括雷击干扰、电线内快速瞬态浪涌及工业应用中的感应尖峰在内的高峰值浪涌保护。
Littelfuse(力特) RXEF040 PTC过流保护器件 数据手册
描述- 本资料介绍了PolySwitch® RXEF040过电流保护器件的规格和应用。该产品由Littelfuse公司生产,具有72伏最大电压和40安培最大电流的电气额定值。它采用耐火焰环氧聚合物绝缘材料,符合UL94 V-0标准,并使用镀锡铜包钢引线。
型号- RXEF,RXEF040,RXEF040-2,RXEF040-AP,RXEF040S
Littelfuse(力特) HMOV径向引线压敏电阻数据手册
描述- 该资料介绍了Littelfuse公司的HMOV系列径向引线压敏电阻器。这些电阻器专为需要高浪涌能量吸收和高工作温度(125°C)的应用设计,具有高达10kA(8/20µs脉冲)的最大峰值电流,用于保护免受间接雷击、开关浪涌瞬变和不正常快速瞬变的损害。
型号- V10H14P,P10H440,V20H385P,P20H35,P20H30,P10H320,V14H440P,V14H250P,V14H95P,P14H460,P14H35,P10H75,V10H150P,P14H30,V20H115P,V10H300P,P20H175,V10H25P,P10H175,V20H14P,V14H510P,P14H625,P20H40,V14H320P,V14H550P,V20H30P,V14H275P,V14H130P,P14H510,P14H230,P20H625,V14H30P,V10H230P,V10H40P,V10H460P,P20H460,V10H420P,P14H40,P20H11,P10H140,V20H460P,P10H385,V10H20P,V10H625P,V20H230P,V20H420P,P20H14,V20H25P,V14H115P,P10H420,V14H14P,P20H95,V14H385P,P14H115,P10H300,V20H40P,P20H510,P20H115,P14H17,P14H14,P10H50,V10H95P,V10H140P,P14H11,P14H95,P20H230,P20H23,V20H300P,P10H550,P10H275,P20H20,P20H25,P10H150,V20H150P,V14H25P,V10H11PL1B5,V14H40P,P14H25,P14H250,P14H130,V10H175P,P14H23,V10H30P,P20H17,P14H20,P10H60,V10H510P,P20H75,V20H175P,V20H35P,V20H23P,V20H11P,V14H420P,HMOV,V20H75P,V14H75P,V14H230P,V14H460P,P14H300,V20H50P,V14H11P,V14H23P,P14H420,P14H385,P10H35,P14H140,V10H130P,P20H250,P10H30,V10H550P,P14H75,V10H275P,P20H130,V10H320P,P10H130,P10H250,V20H140P,V10H17P,V14H35P,V14H300P,P20H420,V14H150P,P20H300,V14H50P,P14H550,P14H275,V10H60P,P10H40,P20H140,P14H150,V10H250P,P20H385,V10H440P,V20H625P,V20H440P,P10H460,V20H250P,V20H17P,P20H50,V14H175P,P10H14,V20H60P,P14H320,P10H17,P10H11,P14H440,P10H95,P20H150,P20H550,P20H275,P14H50,V10H35P,V20H320P,V20H550P,P14H60,V10H115P,P10H230,V10H75P,V20H130P,V20H510P,V14H625P,V10H11P,V10H23P,V20H275P,V14H17P,P10H115,V20H20P,P10H510,P20H60,V14H20P,V20H95P,P10H25,V14H140P,V14H60P,P14H175,P10H625,P10H23,V10H50P,P10H20,P20H440,P20H320,V10H385P
电源出现频繁浪涌时会造成MOV压敏电阻烧毁冒烟,请问有什么办法可以解决?
压敏电阻的失效模式是短路,单独使用失效后可能造成烧毁。一般会在对应的回路上串联一个保险丝来防止其烧毁。
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提供蓝牙BLE芯片协议、蓝牙模块、蓝牙成品测试认证服务;测试内容分Host主机层,Controller控制器层,Profile应用层测试。支持到场/视频直播测试,资深专家全程指导。
实验室地址: 深圳 提交需求>
可加工线路板层数:1~10层;最小孔径:0.2mm;孔径公差范围:±0.076mm(±3mil),板尺寸:5mm×5mm~600mm×600mm;板厚:0.2mm±0.08mm~2.0±0.1mm。
最小起订量: 1 提交需求>
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