贴片电子元件代码(丝印)查询

THESMDCODEBOOKSMDCodes.SMDdevicesare,bytheirverynature,toosmalltocarryconventionalsemiconductortypenumbers.Instead,asomewhatarbitrarycodingsystemhasgrownup,wherethedevicepackagecarriesasimpletwo-orthree-characterIDcode.Identifyingthemanufacturers'typenumberofanSMDdevicefromthepackagecodecanbeadifficulttask,involvingcombingthroughmanydifferentdatabooks.ThisHTMLbookisdesignedtoprovideaneasymeansofdeviceidentification.Itlistswellover3,400devicecodesinalphabeticalorder,togetherwithtypenumbers,devicecharacteristicsorequivalentsandpinoutinformation.HowtousetheSMDCodebookToidentifyaparticularSMDdevice,firstidentifythepackagestyleandnotetheIDcodeprintedonthedevice.Nowlookupthecodeinthealphanumericlistingwhichformsthemainpartofthisbookbyclickingonthefirstcharactershownintheleft-menu.Unfortunately,eachdevicecodeisnotnecessarilyunique.Forexampleadevicecoded1AmightbeeitheraBC846AoraFMMT3904.Eventhesamemanufacturermayusethesamecodefordifferentdevices!Ifthereismorethanoneentry,usethepackagestyletodifferentiatebetweendeviceswiththesameIDcode.ThiscompilationhasbeencollectedfromRPBlackwellG4PMK,manufacturers'dataandothersourcesofSMDdeviceIDcodes,pinoutandleadeddeviceequivalentinformation.TheentriesundertheManufacturercolumnarenotintendedtobecomprehensive;rathertheyareintendedtoprovidehelponlocatingsourcesofmoredetailedinformationifyourequireit.IDCodeVariationsManymanufacturersuseanextraletterastheirownidentificationcode.IfthedeviceisfromPhilipsitwillsometimeshavealowercase'p'(orsometimes't')addedtothecode;Siemensdevicesusuallyhavealowercase's'.Forexample,ifthecodeis1A,accordingtothetablethereareanumberofpossibilities:•1ABC846APhiITTNBC546A•1AFMMT3904ZetN2N3904•1AMMBT3904MotN2N3904•1AIRLML2402IRFn-chmosfet20V0.9AThishasbeenaprobleminthepast,howeverrecentlymanufacturershavebeenaddinglowercaseletterswhichclarifythecode.ManyrecentMotoroladeviceshaveasmallsuperscriptletterafterthedevicecode,suchasSAC.(Thissmallerletterismerelyamonthofmanufacturecode.)ManydevicesfromRohmSemiconductorswhichstartwithGhavedirectequivalentsfoundintherestofthenumber.ForexampleGD1isthesameasD1whichisaBCW31.Somedeviceshaveasinglecolouredletter(usuallyonextremelysmalldiodepackages).Colour,ifsignificant,isshowninsmalltypeafterthecodeletter.An'L'suffixusuallyindicatesalow-profilepackage,suchasanSOT323orSC70.SOT323.SC70.Reversejoggledevicesdopresentafewproblems.Theyofternhavean'R'inthetypenumber.Areversepackageisonewheretheleadhavebeenbentupinsteadofdown.Soit'samirrorimageofaconventionaldevice.Identificationisusuallypossiblefromthecodenumber,butsomemanufacturersusethesamecode.Inthesecases,it'sacaseoflookingatthedevicewithamagnifyingglass.Theleadsofmostnormalpackagescomeoutclosertothecircuitboardsideofthedevice;converselyareversejogglepackagewillhavethemcomingoutclosertothe'top'ofthedevice.Sometimesaseriesofdevices,derivedfromthesamedie,haverelatedtype(notcode)numbers.Oftenan'R'willindicateareversejogglepackage,and/ora'W'indicateasmallerpackagevariant,suchasSOT343.Sometimessimilaritiesarealsofoundinthecodenumbers.Forexample:Recentlysomemanufacturershaveusedasymbolorlowercaselettertoindicatethecountryofmanufacture.Thesehavebeenignoredinthealphabeticalordering.Forexample:•'67'isthecodeforaBFP67(SOT143package),•'67R'isthecodeforthereversejogglevariantBFP67R(SOT143R),•'W67'isthecodeforaSOT343packageversion.SOT143.'Z-S'and'ZtS'areboth2PC4081QdevicesmadebyPhilips;thefirstmadeinHongKongandthesecondinMalaysia;thisappearsinthecodebookclassifiedunderZS.LeadedequivalentdeviceandinformationWherepossible,thelistinggivesthepartnumberofaconventionalwire-leadeddevicewithequivalentcharacteristics.Iftheleadeddeviceiswell-knownthennomoreinformationisgiven.Ifthedeviceislesscommon,someadditionalinformationwillsometimesbegiven.Wherenoexactleadedequivalentexists,abriefdevicedescriptionisgiven,whichmaybesufficienttoallowsubstitutionwithanotherdevice.Whendescribingdevicecharacteristics,sometermsareimpliedfromthetypeofdevice.Forexample,avoltagespecifiedforarectifierdiodeisusuallythemaximumPIV(peakinversevoltage)ofthediode,butforazenerdiodetheoperating(zenervoltage)willbegiven.Normally,whereavoltage,currentorpowerisspecified,thesewillbelimitingvalues.Forexample,adevicespecifiedasNPN20V0.1A1WisaNPNtransistorwithaVce(max)of20V,maximumcollectorcurrentof100mAandamaximumtotalpowerdissipationof1W.Someofthetransistorsaretypeswithintegratedresistors;inthelist,abaseresistormeansaresistorconnectedinserieswiththebase.Whentworesistorvaluesaregiven,thefirstistheseriesbaseresistor,andthesecondtheresistorbetweenbaseandemitter.DigitalTransistors(dtr)Thesearetransistorswithbuilt-inresistors.Somehaveoneresistorbetweenbaseandemitter,othersinserieswiththebase.Manyothershaveboth.Tokeepthingssimple,theseriesresistoriscalledR1andthebaseemitterresistoriscalledR2.Ifbotharepresent,thentwovaluesaregiven,R1first.So4k7+10kmeansthatR1(thebaseresistor)is4k7andR2(theresistorbetweenbaseandemitter)is10k.ConclusionIdentifyingthemanufacturers'typenumberofanSMDdevicefromthepackagecodecanbeadifficulttask,involvingcombingt