2005年3月29日 AllegroMicroSystems公司推出A3245全球第一款适合3.6伏特至24伏特的全极霍尔效应传感器。Allegro全新A3245数字开关的全极功能轻松替代簧片开关，以实现更高的可靠性和制造的简易性，同时消除信号条件的要求。.此外，该器件的全极性能还消除了简单位置感测应用在制造过程中的磁铁定向需求。Allegro专利动态偏移取消实现了较好的高温性能，可降低通常由器件超模压、温度依存性及热应力引起的剩余偏移电压。全极功能允许在以下条件下的操作：北极或南极的磁场强度足够大，就能打开输出；没有磁场的时候，输出就会停止。A3245将以下内容包含在单硅片上：稳压器、霍尔发电机、小型信号放大器、稳定斩波、施密特触发器和短路保护开路集电极输出。先进的BiCMOS晶片加工工艺利用了低电压要求、元件匹配、极低的输入偏移错误和小型元件几何尺寸的优势。A3245主要面向消费、计算机/办公、工业和汽车市场。A3245系列可在-40 C至+150 C温度范围内工作，采用两种封装类型：三引脚单列直插式封装(UA)和三引脚表面安装封装(LH)。AllegroMicroSystems公司是高级混合信号功率半导体和霍尔效应传感器供应商，专注服务于汽车、通讯、计算机/办公自动化以及消费和工业市场。其在集成磁性传感器和集成电动机驱动器产品领域处于领先地位。0755-82501836 13684976689陈小姐QQ:744658389MSN：chen2010123@hotmail.comE-mail：chenling2008456@163.comQQ:744658389经销：霍尔元件，电机步进驱动，传感器，自恢复保险丝，二，三极管，电阻，电容，电感滤波器，磁珠等FeaturesandBenefitsOmnipolaroperationChopperstabilizationSuperiortemperaturestabilityExtremelylowswitchpointdriftInsensitivetophysicalstressReversebatteryprotectionOutputshortcircuitprotectionSolidstatereliabilitySmallsizeRobustEMCcapabilityHighESDratings(HBM)DescriptionTheA3245integratedcircuitisanomnipolar,ultrasensitiveHall-effectswitchwithadigitaloutput.Thissensorhasanintegratedregulatorpermittingoperationto24V,makingitthefirstomnipolarswitchavailableforoperationto24V.Thisdeviceisespeciallysuitedforoperationoverextendedtemperatureranges,upto+150 C.Superiorhigh-temperatureperformanceismadepossiblethroughanAllegro patenteddynamicoffsetcancellation,whichreducestheresidualoffsetvoltagenormallycausedbydeviceovermolding,temperatureexcursions,andthermalstress.TheA3245Hall-effectswitchincludesthefollowingonasinglesiliconchip:voltageregulator,Hall-voltagegenerator,small-signalamplifier,chopperstabilization,Schmitttrigger,andashortcircuitprotectedopen-drainoutput.AdvancedBiCMOSwaferfabricationprocessingisusedtotakeadvantageoflow-voltagerequirements,componentmatching,verylowinput-offseterrors,andsmallcomponentgeometries.TheomnipolaroperationoftheA3245allowsactivationwitheitheranorthorasouthpolarityfieldofsufficientstrength.Intheabsenceofamagneticfield,theoutputisoff.Thispatentedmagnetic-polarity-independencefeaturemakesthisdeviceanexcellentreplacementforreedswitches,withimprovedeaseofmanufacturing,becausetheA3245doesnotrequiremanufacturerstoorienttheirmagnets.Thesedevicesallowsimpleon/offswitchinginindustrial,consumer,andautomotiveapplications.TheA3245isratedforoperationbetweentheambienttemperatures 40 Cand85 CfortheEtemperaturerange,and 40 Cto150 CfortheLtemperaturerange.ThesmallgeometriesoftheBiCMOSprocessallowthesedevicestobeprovidedinultrasmallpackages.Thepackagestylesavailableprovidemagneticallyoptimizedsolutionsformostapplications.PackageLHisanSOT23W,aminiaturelow-profilesurface-mountpackage,whilepackageUAisathree-leadultraminiSIPforthrough-holemounting.Eachpackageisavailableinalead(Pb)freeversion,with100%mattetinplatedleadframes.FunctionalBlockDiagramPartNumberPackageTypeRoHSTemperatureCompliantA3245ELHLT 3-leadSOT No-40 C to 85 CA3245ELHLT-T 3-leadSOT Yes-40 C to 85 CA3245EUA 3-pinSIP No-40 C to 85 CA3245EUA-T 3-pinSIP Yes-40 C to 85 CA3245LLHLT 3-leadSOT No-40 C to 150 CA3245LLHLT-T 3-leadSOT Yes-40 C to 150 CA3245LUA 3-pinSIP No-40 C to 150 CA3245LUA-T 3-pinSIP Yes-40 C to 150 C