2005年3月29日 AllegroMicroSystems公司推出A3245全球第一款適合3.6伏特至24伏特的全極霍爾效應傳感器。Allegro全新A3245數字開關的全極功能輕松替代簧片開關，以實現更高的可靠性和制造的簡易性，同時消除信號條件的要求。.此外，該器件的全極性能還消除了簡單位置感測應用在制造過程中的磁鐵定向需求。Allegro專利動態偏移取消實現了較好的高溫性能，可降低通常由器件超模壓、溫度依存性及熱應力引起的剩余偏移電壓。全極功能允許在以下條件下的操作：北極或南極的磁場強度足夠大，就能打開輸出；沒有磁場的時候，輸出就會停止。A3245將以下內容包含在單硅片上：穩壓器、霍爾發電機、小型信號放大器、穩定斬波、施密特觸發器和短路保護開路集電極輸出。先進的BiCMOS晶片加工工藝利用了低電壓要求、元件匹配、極低的輸入偏移錯誤和小型元件幾何尺寸的優勢。A3245主要面向消費、計算機/辦公、工業和汽車市場。A3245系列可在-40 C至+150 C溫度范圍內工作，采用兩種封裝類型：三引腳單列直插式封裝(UA)和三引腳表面安裝封裝(LH)。AllegroMicroSystems公司是高級混合信號功率半導體和霍爾效應傳感器供應商，專注服務于汽車、通訊、計算機/辦公自動化以及消費和工業市場。其在集成磁性傳感器和集成電動機驅動器產品領域處于領先地位。0755-82501836 13684976689陳小姐QQ:744658389MSN：chen2010123@hotmail.comE-mail：chenling2008456@163.comQQ:744658389經銷：霍爾元件，電機步進驅動，傳感器，自恢復保險絲，二，三極管，電阻，電容，電感濾波器，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