LF5A美国力特贴片保险丝

力特littelfuse一次性贴片保险丝介绍Littelfuse作为全球数一数二的电路保护专家，是全球领先的电路保护产品供应商，为客户提供享誉世界、顶级性能的电子、电信、汽车和电气行业品牌产品。

在行业中建立了最广泛和最全面的电路保护产品系列和产品线，是世界最大的电路元器件供应商，也是世界第一电路保护品牌。

今天我简单介绍一下littelfuse的一次性贴片保险丝。

产品简介图一、首先从NANO保险丝介绍起，分别有0451，0452两个系列。

①0451系列：0451为陶瓷材质，2410体积，尺寸：6.1*2.5MM左右，误差在0.1-0.2MM，快速保护保险丝，Nano2 SMF保险丝是一款超小型、方形表面贴装的保险丝，也可连同表面贴装保险丝座供货。

抗浪涌表面贴装保险丝具有抗浪涌容耐能力, 并能提供直流电源系统的过电流保护。

这些器件结合了单片银质保险丝及多层设计,能够提供强大的电弧抑制特性。

这些表面贴装式器件符合RoHS 设计, 有助于为更可靠高性能的消费电子产品设计研发提供便利, 如手提电脑、多媒体设备、手机及其他便携式电子设备。

功能与特色:特快熔断，尺寸小巧，产品额定电流范围广（62mA至15A），工作温度范围广泛，低温降额，符合RoHS标准，无卤素。

产品用处：笔记本电脑、液晶/ PDP电视、液晶显示器、LCD / PDP面板、LCD背光逆变器、便携式DVD 播放器、电力供应、网络、PC服务器、冷却风扇系统、存储系统、电信系统、无线基站、白色家电、游戏机、办公自动化。

②0452保险丝：0452系列耐压值为65V-125V，保持电流为0.062A-15A，温控范围为-55+125℃，2410体积，尺寸为6.1*2.5MM，慢断陶瓷贴片保险丝。

NANO2慢熔型保险丝耐受突入电流的特性比NANO2快熔型保险丝更优异。

该保险丝设计中独特的延时特性有助于解决误“断路”问题，因为可能耐受突入电流，而快熔型保险丝在出现此类电流时往往会熔断。

Fuse Selection Training 基本保險絲學Fuse functionality -Limited current vs Potential current FuseA Fuse is a Temperature Sensitive Device that serves as an intentional Weak Linkin an electrical circuit. It interrupts overload and short-circuit conditions when itsi l t i l i it It i t t l d d h t i it diti h itmetallic element melts; thereby halting the overcurrent condition.Circuit response without fuse protection–current is eventually disrupted (in anunpredictable manner) due to the failure of acomponent or circuit board tracecomponent or circuit board traceFused circuitp-current is interrupted in a controlled manner(by the fuse) to avoid damage to circuitcomponents-circuit is allowed to fail “gracefully”保險絲基本工作原理:•結構: 金屬熔絲及兩端極•功能: 保險絲是串聯在電路中,當電路正常工作時,保險絲只相當予一根導線能夠長時間穩定地使用. 只有當電路中發生較大的過載電流和或發生短路時保險絲才會熔斷開電流來保護電路的安全.•原理: 保險絲通電時因電流轉換的熱量會使熔絲的溫度上升. 當正常工作電流或允許的過載電流通過時, 電流產生的熱量通過熔絲,殼體向周圍環境輻射, 通過對流和傳導等方式散發的熱量能與產生的熱量逐漸達到平衡. 當散熱速跟不上發熱時這些熱量就會在熔絲上逐漸累積,使溫度上升,一旦溫度達到和超過熔絲材料的熔點時會使熔絲熔化而斷開電流,達到保護的作用.保險絲允許的過載能力(Fuse Current Capacity)Max. Carrying current:•STD InUL 保險絲的最大不熔斷電流是75% ；•IEC STD保險絲的最大不熔斷電流是100%In。

© 2015 Littelfuse, Inc.Specifications are subject to change without notice. Revised: 02/23/15The 1206L Series PTC provides surface mount overcurrent protection for applications where space is at a premium and resettable protection is desired.Electrical CharacteristicsI hold = Hold current: maximum current device will pass without tripping in 20°C still air. I trip = Trip current: minimum current at which the device will trip in 20°C still air.V max = Maximum voltage device can withstand without damage at rated current (I max) I max = Maximum fault current device can withstand without damage at rated voltage (V max )P d = Power dissipated from device when in the tripped state at 20°C still air.R min = Minimum resistance of device in initial (un-soldered) state.R typ = Typical resistance of device in initial (un-soldered) state.R 1max =M aximum resistance of device at 20°C measured one hour after tripping or reflow soldering of 260°C for 20 sec.DescriptionAgency ApprovalsFeaturesApplications• R oHS compliant, lead-free and halogen-free • F ast response to fault currents • C ompact design saves board space• L ow resistance • L ow-profile • C ompatible with high temperature solders• U SB peripherals • D isk drives • C D-ROMs • P lug and play protection for motherboards and peripherals• M obile phones - battery and port protection • D isk drives • P DAs / digital cameras • G ame console port protectionCaution: Operation beyond the specified rating may result in damage and possible arcing and flame.1 Some older references to these devices may include “–C “ in the Part Number. The “–C “ should be omitted when placing new orders for the device.2 Part Number tested and complied with AEC-Q200.© 2015 Littelfuse, Inc. Specifications are subject to change without notice.Revised: 02/23/15T emperature Rerating Curve-40-30-20-100102030405060708010%30%50%70%90%110%130%150%170%Temperature (°C)PercentageofRatedCurrentAverage Time Current CurvesThe average time current curves and Temperature Rerating curve performance is affectedby a number or variables, and these curves provided as guidance only. Customer mustverify the performance in their application..12A.16A.2A.25A.35A.35A/15V.5A.5A/15V.75A1.A1.1A1.5A2.A100001210L OLD.5A.1A.2A.35A.5A.75A1.1A1.5A1.75A2.A0.010.11101000.1110TimeinSecondsCurrent in Amperes1210L.5A.1A.2A.35A.5A.75A.75A/241.1A1.5A1.75A2.A0.010.11101000.1110TimeinSecondsCurrent in Amperes1206L.12A.16A.2A.25A.35A,.35A/15V.5A,.5A/15V.75A.75A/13.2V1.1A1.5A1.75A2.ANotes: The temperature rerating data is only for reference, please contact Littelfuse technical support for detail temperature rerating information.© 2015 Littelfuse, Inc.Specifications are subject to change without notice. Revised: 02/23/15Environmental SpecificationsPhysical Specifications-- All temperature refer to topside of the package, measured on the package body surface -- If reflow temperature exceeds the recommended profile, devices may not meet the performance requirements-- Recommended reflow methods: IR, vapor phase oven, hot air oven, N 2 environment for lead-- Recommended maximum paste thickness is 0.25mm (0.010 i nch)-- Devices can be cleaned using standard industry methods and solvents -- Devices can be reworked using the standard industry practices© 2015 Littelfuse, Inc.Specifications are subject to change without notice.Revised: 02/23/15(.040)MARKING CODE VARIES WITH AMPERAGE RATING(SEE ELECTRICAL CHARACTERISTICS CHART)SHOWN IS 1.0 AMP RATINGWARNING• Users shall independently assess the suitability of these devices for each of their applications• Operation of these devices beyond the stated maximum ratings could result in damage to the devices and lead to electrical arcing and/or fire• These devices are intended to protect against the effects of temporary over-current or over-temperature conditions and are not intended to perform as protective devices where such conditions are expected to be repetitive or prolonged in duration• Exposure to silicon-based oils, solvents, electrolytes, acids, and similar materials can adversely affect the performance of these PPTC devices• These devices undergo thermal expansion under fault conditions, and thus shall be provided with adequate space and be protected against mechanical stresses • Circuits with inductance may generate a voltage (L di/dt) above the rated voltage of the PPTC device.© 2015 Littelfuse, Inc.Specifications are subject to change without notice. Revised: 02/23/15=10,000 Y =4,000 W =3,000 P =2,000Tape & Reel-A: Automotive grade Blank: Standard version© 2015 Littelfuse, Inc.Specifications are subject to change without notice.Revised: 02/23/15。

Shock-Safe Fuseholder, 5 x 20 mm, Slotted Cap, Press, IEC 60335-1See below:Approvals and Compliances 250 VAC · 2.5 W / 10 A (VDE) · 500 V · 16 A (UL/CSA)Description- Press-fit mount, secured with potting compound on the rear side - Compact design- Degree of protection IP67 available- White color available on request Applications- Household appliances- Medical equipmentWeblinkspdf data sheet, html data sheet, General Product Information, Packaging details, Distributor-Stock-Check, Detailed request for product, MicrositeT echnical DataShock-Safe Category PC2Fuse-Link 5 x 20 mmMounting Panel mount, Front SideAttachment Press-FitTerminal Solder or Quick-Connect 4.8 x 0.5 mm Rated Voltage250 VAC , 500 V (UL/CSA)Rated current10 A (VDE), 16 A (UL/CSA)Rated Power Acceptance IEC 2.5 W / 10 A @ Ta 23 °CAdmissible power acceptance at higherambient temperature see derating cur-vesDegree of Protection IP 40 / IP 67Protection Class Suitable for appliances with protectionclass I acc. to IEC 61140Admissible Ambient Air Temp.-40 °C to 85 °CClimatic Category40/085/21 acc. to IEC 60068-1 Material: Socket Thermoplastic, black, UL 94V-0 Material: Terminals Tin-Plated Copper AlloyUnit Weight 5.3 gStorage Conditions0 °C to 60 °C, max. 70% r.h.Product Marking, Type, Rated Voltage, Power Acc./Current Rating, Certification marks Soldering Methods IronSoldering ProfileSolderability350 °C / 2 sec acc. to IEC 60068-2-20,Test Ta, method 2Resistance to Soldering Heat350 °C / 10 sec acc. to IEC 60068-2-20,Test Tb, method 2Contact Resistance≤10 mΩ at 100 mA acc. to IEC60127-6Dielectric Strength> 3 kV> 4 kV between L/N-PE(50 Hz: 1 min)Impulse Withstand Voltage> 2.5 kV between L-N> 6 kV between L/N-PEInsulation Resistance> 10 MΩ between L-N> 100 MΩ between L/N-PE(500 VDC: 1 min)Overvoltage Category III acc. to IEC 60664-1Pollution Degree 3 acc. to IEC 60664-1Resistance to Vibration acc. to IEC 60068-2-6, test FcPanel Thickness max 2.5 mmApprovals and CompliancesDetailed information on product approvals, code requirements, usage instructions and detailed test conditions can be looked up in Details about ApprovalsSCHURTER products are designed for use in industrial environments. They have approvals from independent testing bodies according to national and international standards. Products with specific characteristics and requirements such as required in the automotive sector according to IATF 16949, medical technology according to ISO 13485 or in the aerospace industry can be offered exclusively with customer-specific, individual agree-ments by SCHURTER.1ApprovalsThe approval mark is used by the testing authorities to certify compliance with the safety requirements placed on electronic products. Approval Reference T ype: FPG6Approval Logo Certificates Certification Body DescriptionVDE Approvals VDE VDE Certificate Number: 127216UL Approvals UL UL File Number: E39328KTL Approvals KTL Korea Testing LaboratoryProduct standardsProduct standards that are referencedOrganization Design StandardDescriptionDesigned according to IEC 60127-6Miniature fuses. Part 6. Fuse-holders for miniature fuse-linksDesigned according to UL 4248-1Fuseholder general requirementsDesigned according to CSA C22.2 no. 4248.1Fuseholder general requirements Application standardsApplication standards where the product can be usedOrganization Design StandardDescriptionDesigned for applications acc.IEC/UL 60950IEC 60950-1 includes the basic requirements for the safety of informationtechnology equipment.Designed for applications acc.IEC 60335-1Safety of electrical appliances for household and similar purposes. Meetsthe requirements for appliances in unattended use. This includes theenhanced requirements of glow wire tests acc. to IEC 60695-2-11 or -12& -13.CompliancesThe product complies with following Guide LinesIdentification Details Initiator DescriptionCE declaration of conformity SCHURTER AG The CE marking declares that the product complies with the applicablerequirements laid down in the harmonisation of Community legislation onits affixing in accordance with EU Regulation 765/2008.RoHS SCHURTER AG EU Directive RoHS 2011/65/EUChina RoHS SCHURTER AG The law SJ / T 11363-2006 (China RoHS) has been in force since 1 March2007. It is similar to the EU directive RoHS.REACH SCHURTER AG On 1 June 2007, Regulation (EC) No 1907/2006 on the Registration,Evaluation, Authorization and Restriction of Chemicals 1 (abbreviated as"REACH") entered into force.White paper Glow wire test SCHURTER AG Meets the requirements of IEC 60335-1 for appliances in unattended use.This includes the enhanced requirements of glow wire tests acc. to IEC60695-2-11 or -12 &-13.Dimension [mm] 41.5 mmMounting holes23Derating CurvesA d m i s s i b l e p o w e r a c c e p t a n c e i n W a t t1.51.00.50.02.52.0Ambient air temperature Ta °CAll Variants Packaging Unit Bulk 186 x 91 x 91 mm (100 pcs.)The specifications, descriptions and illustrations indicated in this document are based on currentinformation. All content is subject to modifications and amendments. Information furnished is believed 13.02.2019。

力特littelfuse保险丝产品体系一、力特保险丝类别：Littelfuse致力于生产最全面、最具创新性的保险丝产品系列。

保险丝包括：汽车售后市场产品，乘用车轴向型、径向型及通孔型保险丝，盒型保险丝，危险区域型保险丝，工业用电源和UL保险丝，中等电压保险丝，军用高可靠性保险丝，特种电源保险丝，表面贴装保险丝。

1.轴向型、径向型及通孔型保险丝在创新推动下，Littelfuse提供各种轴向型、径向型及通孔型保险丝以满足每位客户的需求。

包括PICO保险丝、HVAC保险丝、Micro TR3 保险丝、危险区域型保险丝等。

2.汽车售后市场产品汽车保险丝，切片保险丝，保险丝螺栓等。

3.表面贴装保险丝（1）一次性贴片保险丝：Littelfuse的表面封装保险丝可用于众多过流保护应用。

我们的优质保险丝包括扁平封装保险丝和Nano 2保险丝、薄膜贴片保险丝等。

①Nano 保险丝包括：0443，0448,0449,0451,0452,0453,0454,0455，0456,0458,0461,0462，0463，0464，0465，0470。

0485系列。

②薄膜贴片保险丝包括：0429，0430，0431，0433，0434，0435，0437，0438， 0440，0441， 0466，0467， 0468， 0469， 0494，0501等系列。

（2）自恢复保险丝Littelfuse PolySwitch聚合物和POLY-FUSE设备正温度系数(PPTC)设备提供复位过电流保护的选择,从而减少保修,服务和维修成本。

理想的情况下,频繁的过电流条件下发生或持续正常运行时间是必需的,复位ptc(PPTCs)通常用于消费电子、电力线路、电信、I / O端口,过程控制和医疗设备保护的应用程序。

ptc电阻随着温度的增加,由于增加流量增加。

旨在限制不安全的电流,同时允许安全目前的水平不变,阻力将“重置”故障时自动删除和温度返回到一个安全的水平。

教你认识贴片保险丝——常用贴片保险丝识别要览随着电子元器件的小型化和贴片化，保险丝也随之走向小型贴片化，贴片式保险丝的应用愈来愈广，它们在电脑及外设接口、平板电视、手机、汽车电子电路及电池组等的过流保护中已大显身手。

除常见的熔断型保险丝外，近些年来，PPTC自复式保险丝（聚合物正温度系数热敏电阻）的兴起，更为IT设备的保护带来了新局面。

与贴片二、三极管和贴片IC等元件一样，贴片保险丝目前还没有统一标定方法，所以各生产厂家采用的代码各异。

有时甚至还出现同厂家用同一种代码（在不同系列中）代表不同额定电流的现象。

更有一些怪怪的代码，连识别都感到困难，给维修代换平白增添了不少麻烦。

本文列举了各类常用贴片保险丝的识别方法，以期满足维修代换的需要。

更希望读者逐渐积累识别贴片式保险的方法，在实践中不断提高自己这方面的能力。

一、常用熔断型贴片保险丝的识别熔断型贴片保险丝（贴片熔断器）与通常使用的保险丝功能基本相同，它在额定的电流下（电路正常时）能正常工作，当电路出现故障达到或超过熔断电流值时熔断，这可以避免故障进一步扩大，从而保护了电路。

保险丝（熔断器）按熔断速度分为：特慢速保险丝（一般用TT表示）、慢速保险丝（一般用T表示）、中速保险丝（一般用M表示）、快速保险丝（一艘用F表示）和特快速保险丝（一般用FF表示）等五种类型。

按最大分断电流的大小又可分为低分断型（L）和高分断型（H）两种。

熔断型贴片保险丝的标示方法一般可分为直接标示法和代码标示法两种，而代码标示法又可细分为字母(或数字)标示法与图形标示法两类，1 直接标示法图1的贴片保险，将主要特性参数直接标注在元件正面，称为直接标示法，简称直标法。

直标法一般用于体积略大的“方头”瓷管保险和长方体塑封贴片保险上。

图1中，上面一行的第1个符号为生产厂家力特(LITTELFUSE)公司的厂标，后面的F说明为快速熔断型，500mA是额定电流，字母L表示为低分断型；下面一行为额定电压交流250V，最后那个图形标志表示产品符合IEC（国际电工委员会）普通保险丝的标准。

型号额定电压 额定电流外型尺寸 通过认证 资料下载2920SMD 自复保险丝15~60V0.3~3.0A7.3 ×5.0mmUL TUVPtc2920-1.PDF29 20 英寸 1812SMD 自复保险丝10~40V0.1~2.6A4.6 ×3.0mmUL TUVPTC1812-1.PDF PTC1812-2.PDF18 12 英寸 1206SMD 自复保险丝6V0.35~1.5A3.2×1.6mmUL TUV PTC1206-1.PDF PTC1206-2.PDF12 06 英寸0805SMD 自复保险丝6~15V0.1~0.75A2.0×1.2mmUL TUVPTC0805-1.PDF PTC0805-2.PDF系列外型尺寸1206 系列贴片保险丝3.2*1.6mm 0.12*0.06 英寸0603 系列贴片保险丝 1.6*0.8mm 0.06*0.03 英寸0402 系列贴片保险丝 1.0*0.5mm 0.01*0.005 英寸2410 系列贴片保险丝 6.8*2.7mm 0.24*0.10 英寸型号额定电压额定电流外型尺寸(mm)通过认证资料下载20N 速断型250V/125V 0.1∽20AΦ2.7*7.2 UL/CSA/PSE20N.pdf20T.pdf 20T 延时型250V/125V0.1∽7.0AΦ2.7*7.2 UL/CSA/PSEMCR.pdf MCR 速断型125V0.062∽10AΦ3.1*7.5UL/CSAR251 速断型125V0.062∽15AΦ2.4*7.2 UL/CSA r251-253.pdf型号额定电压额定电流外型尺寸(mm)通过认证资料下载SR5 圆柱型250V 1∽5A Φ8.4*7.6 UR/VDE/CCC SR5.pdfSS5.pdf SS5 方型250V1∽5A Φ8.6*7.6*4 UR/CCCmet.pdf MET 圆柱型250V0.04∽6.3AΦ8.4*7.6UR/VDE/CCCMST 方型250V0.04∽6.3AΦ8.6*7.6*4 UR/VDE/CCC mst.pdfU30系列自恢复保险丝 耐压 30VG16系列自恢复保险丝 耐压 16VS 系列自恢复保险丝 耐压 6-16V BR 系列自恢复保险丝 耐压 125V R250系列自恢复保险丝 耐压 250V原理说明 参数说明：保持电流（Ih ）：25℃静止空气环境中不触发电阻突越的最高电流。