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1N4148Diodeisafastswitchingdiode.Itisfabricatedinplanartechnology,andencapsulatedinhermeticallysealedleadedglassSOD27(DO-35)packages.Intheblogtoday,wellintroduce1N4148systematicallyfromitspinout,features,applicationstoitsequivalents,package,etc,somefrequentaskedquestionsarealsolistedbelowatthebottomofthepage,thanksforreadingandhopethisishelpful!TOP2ElectronicprojectswithDiode1N4148.Catalog1N4148Description1N4148PinConfiguration1N4148Features1N4148Applications1N4148CADModels1N4148PackageOutline1N4148EquivalentDiodes1N4148PopularitybyRegion1N4148MarketPriceAnalysisComponentDatasheetFAQOrderingQuantity1N4148DescriptionAdiodeisadevicewhichallowscurrentflowthroughonlyonedirection.ThatisthecurrentshouldalwaysflowfromtheAnodetocathode.Thecathodeterminalcanbeidentifiedbyusingagreybarasshowninthepictureabove.For1N4148Diode,themaximumcurrentcarryingcapacityis300mAitcanwithstandpeaksupto2A.Thespecialityofthisdiodeisitsfastrecoverytimeof8nsataforwardcurrentof10mA,hencethisdiodeisusedinplaceswherefastswitchingareinvolved.1N4148PinConfiguration1N41481N4148PinoutPinNameDescriptionAnodeCurrentalwaysEntersthroughAnodeCathodeCurrentalwaysExitsthroughCathode1N4148FeaturesFastswitchingDiodePeakrepetitiveReversevoltageis100VRMSreversevoltageis75VPeakforwardsurgecurrentis2AForwardcontinuouscurrentIf300mAReverserecoverytime8nsAvailableinDO-35Package1N4148ApplicationsCanbeusedtopreventreversepolarityproblemProtectPowerelectronicswitchesthatareoperatingwithhighswitchingfrequency.HalfWaveandFullWaverectifiersUsedasaprotectiondeviceCurrentflowregulators1N4148CADModelsPartSymbolFootprint3DModel1N4148PackageOutline1N4148EquivalentDiodes1N914,IN914A,1N914B,1N916,1N916A,1N916B,1N4448,1N4448WS,1N4448W,1N4148WS1N4148PopularitybyRegion1N4148MarketPriceAnalysisComponentDatasheet1N4148DatasheetFAQIs1n4148aSchottkydiode?First1N4148isntSchottkydiode.Itstrueitisaswitchingdiode(fast)butnotSchottky.Whatisaswitchingdiodeusedfor?Aswitchingdiodeissuitableforswitchingasmallsignalofupto100mA,actingasarectifier.Incontrast,arectifierdiodeisusedforAClinerectification(fromalternatingcurrenttodirectcurrent).Switchingdiodesaredesignedtohandleavoltageoflessthantensofvolts.Whatdo4148andNindiode1N4148mean?XNXXXX,thisistherepresentationofsemi-conductingbulkcomponentsoftheAmericanStandardsAssociation.XXXXrepresentsthemodelnumber,usuallyastringofnumbers.NmeansPNjunction.ThenumberinfrontrepresentsthenumberofPNjunctions.Forexample,1N4148meansthatithasonlyonePNjunction(iediode),and4148isthemodelnumber.Similarto1N4007,1N4734andthelikearediodes.2NmeansthattherearetwoPNjunctions,whicharetriodesorfieldeffecttransistors.Forexample,common2N3904,2N2222andthelikearetriodes.2N5515isafieldeffecttube(N-channelJFET)Many4Nand6Narephotocouplers,suchas4N25,6N137andsoon.Whatisthedifferencebetween1N4148and1N4007?1N4148isacommonlyusedswitchingdiode(normalforwardcurrentIf:150mA,maximumrepetitivepeakvoltageUmax:100V,reverserecoverytimetrr:4ns).IN4007isalsoacommonrectifierdiode(positivepowerconstantforwardcurrentIf:1A,maximumrepetitivepeakvoltageUmax:1000V).Sotheyarediodeswithdifferentcharacteristics.Whatarethefunctionsofthediode1N4148inthecircuit?Itplaystheroleofdetection,freewheelingandrectificationofsmallcurrentsHowdoIknowifmydiode1n4148isbroken?Identifythepositiveandnegativepolesofthe1n4148diode,oneendwithawhitelineisthenegativepole,andtheotherendisthepositivepole.Settheknobonthemultimetertotheon-offcapacityposition,andinserttheredandblacktestleadsintothecorrectpositionofthemultimeter.Connecttheredtestleadtotheanodeofthediodeandtheblacktestleadtothecathode.Thenobservethereading,ifitoverflows(thatis,itshows1),thediodeisbroken.Ifthereisareading,exchangethetestleads.Ifthereisareadingbutnotoverflow,thediodeisbroken.WhatisthedifferencebetweenIN4148andLL4148?LL4148usuallyreferstotheglasssealedcylindricalLL-34package(SMD,noleads).1N4148usuallyreferstoDO-35glassseal,axialpin,plug-in.Itcanbebraidedorinbulk.

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ThisblogbrieflyintroducesLM317intwoparts.ThefirstpartistheprincipleoftheLM317three-terminaladjustabl

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