【应用】Littelfuse TVS二极管在汽车发动机冷却系统上的应用
当发动机工作时，冷却系统通过控制冷却液的温度，使发动机达到相应工况下的最佳性能。因此，发动机冷却系统是发动机长时间稳定工作的保证。冷却系统的框架如图1所示，其中微控制器是一个重要的组成部分，它从I/O口接收汽车ECU发出的信号，然后根据信号对电控节温器进行控制。微控制器由一个专用电源进行供电，该电源与车上的12V供电电源相连接。
图1 发动机冷却系统框架图
LITTELFUSE（力特）推出的SLD8S系列、TPSMA6L系列、TPSMB系列、TPSMC系列和TPSMD系列TVS二极管是专为汽车应用设计的。在发动机冷却系统中，SLD8S系列TVS二极管能够给微处理器的专用电源提供负载突降保护，TPSMA6L系列、TPSMB系列、TPSMC系列和TPSMD系列TVS二极管则能够给微处理器及其专用电源提供浪涌保护。
图2 SLD8S系列、TPSMA6L系列、TPSMB系列、TPSMC系列和TPSMD系列TVS二极管外观图
如图3所示，在实际的电路中，TVS二极管与被保护的器件并联，当出现负载突降或浪涌现象，致使瞬态电压超过电路的正常工作电压时，TVS二极管将发生雪崩击穿，从而给瞬时电流提供一个超低阻抗的通路，这样瞬时电流就会通过TVS二极管被释放，使被保护的器件免受损伤。在电压恢复到正常值之前，TVS二极管会将被保护电路的电压限制在规定值以内。等到瞬时脉冲结束，TVS二极管才会自动恢复至高阻抗状态，整个电路重回正常电压状态。
图3 TVS二极管被用作汽车系统的分流浪涌保护器和瞬态浪涌保护器
TVS二极管有两种类型，一种是单向TVS二极管，用来保护直流电压，它的阴极应接在电源正极；另一种是双向TVS二极管，相当于由两只单向TVS二极管反向串接而成，使用时可以不考虑电源的正负极。单向TVS二极管和双向TVS二极管的I-V特性曲线如图4所示。单向TVS二极管的正向特性和一般的二极管没有区别，而当反向电压达到击穿电压值（VBR）时，阻抗会迅速降低，通过的电流迅速增大至峰值脉冲电流（Ipp），并且电压会被箝制到规定的箝位电压（Vc）内；双向TVS二极管则是在正反两个方向都具有相同的雪崩击穿特性和箝位特性。
图4 单向TVS二极管和双向TVS二极管的I-V特性曲线
SLD8S系列是单向TVS二极管，对瞬态电压的响应时间在1ps以内。该系列TVS二极管能够让系统通过ISO7637-2和ISO16750-2标准中规定的5a/5b测试，即SLD8S系列TVS二极管提供的负载突降保护是符合汽车相关的标准要求的。当环境温度为25℃时，SLD8S系列TVS二极管的反向峰值电压（VR）为12V～57V，最大箝位电压（Vc）为19.9V～92.7V，能够为在不同电压下工作的多种电路及器件提供保护；最大反向漏电流（IR）为2μA或10μA，对电路的造成影响较小；峰值脉冲功率（PPPM）为7000W（针对10/1000μs脉冲波形），最大峰值脉冲电流（IPP）为75.5A～352A，可用来抵挡高功率、大电流的瞬态脉冲。
TPSMA6L系列是单向TVS二极管，TPSMB系列、TPSMC系列和TPSMD系列既有单向TVS二极管也有双向TVS二极管。TPSMA6L系列和TPSMB系列对瞬态电压的响应时间在1ns以内，TPSMC系列和TPSMD系列对瞬态电压的响应时间在1ps以内。TPSMA6L系列、TPSMB系列、TPSMC系列和TPSMD系列的反向峰值电压分别为5V～85V、6.4V～553V、10.2V～77.8V和10V～85V，最大箝位电压为9.2V～137V、11.3V～897V、16.7V～125V和17V～137V，其中TPSMB系列的电压范围最宽，宽电压范围能为更多电路及器件提供保护；最大反向漏电流大多为1μA或2μA，对电路造成的影响小，有个别是几百μA的，用于高阻抗电路时需注意；峰值脉冲功率分别为600W、600W、1500W和3000W（针对10/1000μs脉冲波形），最大峰值脉冲电流为4.4A～65.3A、0.8A～54A、12.2A～91A和21.9A～176.5A，峰值脉冲功率越高、峰值脉冲电流越大，就能抵挡更高功率、更大电流的瞬态脉冲。
Littelfuse公司的SLD8S系列、TPSMA6L系列、TPSMB系列、TPSMC系列和TPSMD系列TVS二极管，体积小且具有优秀的电气性能，能够让设计者在不改变现有设计空间的前提下升级电路保护，或是在新的电路布局中发挥更大的保护作用，因此是设计者在为发动机冷却系统选择瞬态电压保护器件时的理想之选。
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目录- Company profile Circuit Protection Technologies Overcurrent/Overvoltage Protection device ESD Suppression Solutions Overcurrent Protection/Overvoltage Protection Applications Common Circuit Threatsand Protection Solutions Fuses Fuse Holders PPTC Devices Varistors Gas Discharge Tubes ESD Suppressors TVS Diode Arrays Protection Ics TVS Diodes PLED Bypass Protectors SIDACtor® Protection Thyristors Circuit Breakers
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Littelfuse力特TVS二极管增量浪涌电阻较低，提供单双向极性，反向断态电压和峰值额定功率范围宽，提供高电流保护。Littelfuse力特TVS二极管阵列提供广泛的工业标准分离或多通道贴片包装，这些特性组合起来，使其寄生电容减小到0.4pF，而ESD性能高达±30kV。世强是Littelfuse力特代理商，可供应Littelfuse力特TVS二极管/TVS阵列，价格优惠，库存丰富。
原厂动态 发布时间 : 2018-10-01
Littelfuse的TVS二极管5.0SMDJ90CA峰值功率测试条件10/1000us是代表什么意思？
Littelfuse的TVS二极管5.0SMDJ90CA峰值功率测试条件10/1000us是代表测试波形上升时间10us,从峰值下降时间为1000us。
技术问答 发布时间 : 2019-05-21
Power Train Automotive
型号- SZP6SMB,30EV1K,TPSMA6L,IXD_6XXSL,10EV,440A,S8016XA,IXD_6XXS1,TPSMF4L,CG3,CG2,438A,SZ1SMB,TTP,SZSMF4L,501A,SZ1SMA,PXXX0SD,AQ4022,AQ05C,IX4340NE,HCRTP-MINI,TP5.0SMDJ,SZSMF,SM10,AQ1205,PXXX0FNL,DCNHR,TPSMC,441A,TPSMB,483A,TPSMD,20HEV,881,437A,25EV1K,521,885,20EV,526,527,AUMOV,AQ24COM-02,828
SLD8S Series Surface Mount TVS Diodes Datasheet
型号- SLD8S60A,SLD8S,SLD8S18A,SLD8S17A,SLD8S28A,SLD8S SERIES,SLD8S16A,SLD8S27A,SLD8S15A,SLD8S26A,SLD8S48A,SLD8S14A,SLD8S36A,SLD8S24A,SLD8S57A,SLD8S22A,SLD8S33A,SLD8SXXA,SLD8S43A,SLD8S20A,SLD8S64A,SLD8S30A,SLD8S40A
Circuit Protection Products Selection Guide
型号- PXXX0SAMC,LS2406ERQ23,1812L,LVR,SPHV,30KPA-HR,456SE,456SD,15KPA,SP33R6-04UTG,345 SERIES,1210,ITV9550 30A,AQ24CANFD,SDP,AC,LS2406ERQ33,PXXX2AC,RUEF110S,MICROSMDCH,562 SERIES,AQ1003-01ETG,SDPXXX0T023G5,150603,800,801,802,804,806,807,BA,808,BB,PGB2,PGB1,P4SMA,TSM600,PTF070,MICROASMD,SC7520-08UTG,SC1103C-01UTG,PTF078,PTF077,559 SERIES,LS0504EVT233,PTF075,AQXXC-01LTG,810,811,356 SERIES,5KP,813,814,FB65,FB66,CA,SC7538-08UTG,CG,CH,PTF080,286677,PICOASMDCH,PXXX2AX,MINIASMDC,SMF4L,121004,B61089BDR,282008,121001,282007,820,121003,AK10-Y,821,121002,282002,823,824,282001,FB55,DA,828,DB,FB58,NANOASMDCH,820-20,830,831,834,835,PLED ULTRA LOW,101001,3453,3452,605,606,RKEF,607,PXXX2ACMC,LS12052BD33,AGRF,PTF0080M,B61089QDR,RUEF135V,850,851,852,3455,853,AHEF100,60R,617,618,GTCX36-XXXM-R05,FEMTOSMD,PXXX0Q12X,860,862,HA,PICOASMD,HB34,GTCX36-XXXM-R10,2920L,SP8008,AQ4337-01ETG,155 SERIES,P6SMB,803-01 SERIES,SLD,810 SERIES,870,PTF015,874,875,876,342 SERIES,877,5.0SMDJXXS-HRA,348 SERIES,30KPA,SM7,SM24CANB,SMCG-HR,TSV250,FC09B1606NL-0,SMD,SMF,TPSMB-VR,881,342006 W,35408 SERIES,OMN002,400,OMN004,885,35406 SERIES,881 SERIES,OMN006,646,405,647,V20H275AUTO,407,649,RXEF,101010,52100001009,AQ24CANA,AQHVXX-01LTG,656,101002,PXXXXDF,658,101003,5KPA-HR,5.0SMDJ,570 SERIES,AQ3530-01FTG,B-SERIES,662,1206L400SLWR,663,422,664,665,LA,SMBLCE-HR,L-SERIES,AQHVXX-01LTG-C,PTF050,SC1105-01UTG,PTF055,G-SERIES,435,437,438,ITV5432,A-SERIES,870 SERIES,PTF065,440,RGEF,437A,441,SP1103C,443,202,203,254 121,445,446,688,447,3453 SERIES,448,449,ULTRAMOV™ 25S,208,209,TR600,04450001,PTF030,438A,451,SRP,452,453,454,TSM250,PTF035,AUMOV®,213,456,215,821 SERIES,458,216,LV ULTRAMOV,459,217,218,SP3401,SP3400,AQ3522-01FTG,P6KE,TPSMC,FHN26G2,TPSMB,PTF040,TPSMD,LS2405IDD23,PTF045,460,461,5KPA-HRA,462,220,464,465,466,224,467,225,576 SERIES,468,254 101,229,BXXX0CX,SL0902A,102080,470,BXXX1UX,471,472,230,473,232,233,501A,476,234,235,477,MIDSMD,PXXX4UCMC,239,MHS,P4KE,850 SERIES,813 SERIES,AQ1205-01ETG,483,RA,485,487,802 SERIES,259UL913,ITV4030 22A,SP3530,SM20,345121,102064,345121 SERIES,254 201 - 208,251,SA,494,PLEDXUX,253,SD,SE,SG,SH,259,4.0SMDJ,SL1002A,SM,15KPA-HRA,15KPA-HR,GTCX37-XXXM-R10,102074,102076,102079,102078,NANOSMDCH,GTCA28-XXXM-R03,NY61AP,262,102071,263,265,266,3.0SMC,267,DSLP,268,269,520 002,520 003,520 004,SL1003A,520 005,1KSMB,345101,MLA,LS24062RQ23,1210L,AQ36CANA-02HTG,445073,MLE,MHP-TAM15,272,273,MLN,M-SERIES,274,E-SERIES,275,278,279,AQ3102-02HTG,MHP-TAC6,803-01,MHP-TA,285,AQ3041,SMBLCE-HRA,PLEDXUSXA,SP4322-01ETG,AQ3045,TP1.5KE,SP4208,SC1205-01ETG,820-20 SERIES,354 SERIES,CG33.0L,SP11XX,359 SERIES,ULTRAMOV25S,MS-SERIES,111 SERIES,100 SERIES,NANOSMDC,346877,PICOASMDCH010F-2,340 SERIES,AHRF300,AHEF,342025,342024,342021,ZA,AQ3400,XGD,FH604,AQ1250-01ETG,PXXX3ACMC,FH602,PXXX6U,SP4010,PLEDXN,SZD200,TPSMF-4L,HG34,PLEDXS-A,J-SERIES,824 SERIES,FEMTOASMDC,ITV5432 30A,AK6-Y,557 SERIES,SL1021A,SL1021B,SP4020,SP4022,SP4021,SMDCH,SP4024,281010,SP4023,PLED,MINISMDC,AXXXXUX6,254 011 - 008,SMTAK3,PXXX0Q22XLH,MHP-TAM6,AK15,445005,281007,154T,281008,281005,SC1004U-ULC-04UTG,AK10,1.5KE,AQ1005,51800001009,PXXXXS4X,ITMOV,354701 SERIES,483A,445004,LS05006VPQ33,SP4044,BXXX1UC4,SP4045,5200001,SMBJ,AQXX-01LTG,AQ7538-08UTG,SP1064E-04UTG,TCF250,ITV9550,SMTOAK2,SMAJ,AQ7520-08UTG,PXXX3AX,NANOASMDC,461E,811 SERIES,800 SERIES,157T,FC51,PXXX1U,PXXX1S,TRF250,SMBJ-HRA,SMDJ,CG3,SP3384NUTG,CG2,CG5,CG4,2205,CG7,B3XX4UX,CG6,VLP,VLR,0603L,PLEDXUX-A,SMCJ,PICOASMDC,LS0504EDD12,SMD2,PXXX0Q22C,GTCA28,GTCX35-XXXM-R05,SP00R6-01WTG,SMDJ-HR,SMDC,TMOV34S,AHRF,440A,AXGD10603NR,K-SERIES,TPSMC-VR,H-SERIES,SZ1SMB,SZ1SMC,SZ1SMA,219XA,AK20-Y,ITV9550L2030MR,ULTRAMOV,441A,824 - 20 SERIES,SZ1.5SMC,SP1250-01ETG,C-SERIES,SC1210-01ETG,TB-SERIES,0402L,ITV9550 45A,AHRL,DHB34,FHN26W,AUML,TP6KE,LTKAK3,AQRV05-4HTG,LTKAK2,72R,977,TLP,LTKAK6,AQ15CANA-02HTG,XTREME,PXXX3AC,SP3205-01ETG,501,3452 SERIES,504,505,506,507,GTCX23-XXXM-R01,508,8.0SMDJ,PXXX3U,100060,100061,122090,100062,100063,100064,100065,PXXX0SX,100066,SC1533-01LTG,SPHV-C,AHS,122093,150318,TS600,150319,150316,150317,150315,AQ3102-02JTG,150312,513,514,100058,100059,2016L,286377,SP4337-01WTG,122088,122087,122083,GTCX26-XXXM-R05,521,523,ITV4030,AK15-Y,100067,526,150322,527,PXXX2SXLH,SL1411A,AK1,AK3,AK6,VTP,422A,SMCJ-HRA,ASMD,C-III,SR70,0805L,860 SERIES,RHEF,SMF3.3,303,304,305,308,35409,35408,35407,35406,TPSMA6L,PXXX2SX,SP724,SP725,SC1115-01UTG,TSL250,LOW RHO,HMOV,SP723,SP720,SP721,LVR025K-2,312,313,30R,314,556,315,557,559,318,SLD6S,SP1305,SP712,LCE,560,562,322,564,324,325,326,328,SLD5S,CX-SERIES,345101 SERIES,570,571,332,SLD8S,PXXX0SD,576,TRF600,PICOSMDC,SP3522,3.0SMCJ,SZSMF,LS1205EVD33,SP1326,AQ12CANA-02HTG,340,150307,100,342,FHN20G,344,345,35407 SERIES,348,SMAJ-HRA,150300,AUMOV,LTKAK10,445 SERIES,SC1333-01ETG,RUEF,GTCX25-XXXM-R02,GTCX25-XXXM-R05,LS0502SCD33,111,354,356,52000001009,359,SP3420,150274,RUSBF,SP1003,SP3422,560 SERIES,PXXX0ME,564 SERIES,SP2555NUTG,51900001009,10207101009,520 101,369,SL1122A,571 SERIES,824 - 20,SP1233,AQ2555NUTG,SP1255P,600R,PXXX4UX,WB07B0606L
【产品】符合AEC-Q101汽车级TVS二极管TPSMB系列，为汽车电子保驾护航
Littelfuse针对敏感的汽车电子元件在负载突降和其它瞬态电压事件引发瞬态电压推出了TPSMB系列TVS二极管。该系列紧凑的DO-214AA封装和600W额定功率使其成为高可靠性、汽车和便携式设备应用出色的次级保护解决方案
新产品 发布时间 : 2016-12-16
【元件】Littelfuse新推TVS二极管5.0SMDJxxS-HRA系列，浪涌处理能力增加66%
Littelfuse推出全新5.0SMDJxxS-HRA TVS二极管系列。这些高可靠性TVS二极管经过精心设计、制造和筛选，可提供强大的过压保护功能，早期故障率极低，并且在连续浪涌事件中达到零衰减。
新产品 发布时间 : 2022-11-04
【产品】SOD123FL表面贴装SMF系列TVS二极管，10/1000μs波形下有200W峰值脉冲功率能力
Littelfuse推出的SMF系列TVS二极管，专为保护敏感电子设备免受雷电和其他瞬态电压事件引起的电压瞬变而设计。与SMA封装相比，SMF封装所占的空间要比SMA封装小50％，在业界，SMF封装为众多的低高度（1.1mm）封装提供了一个选择。
新产品 发布时间 : 2020-06-13
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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>
可定制单色光灯珠、双色灯珠、全彩灯珠、发光二极管、贴片灯珠、贴片LED等产品，尺寸：0.6*0.3mm-3.2*2.7mm，波长：405-940nm，亮度：24-750mcd，电压：1.5-3.5V。
最小起订量： 3000 提交需求>
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