:):)
一点老大分享我的资料,大家随便看下喽!
[quote]
MTBFFORDISCRETELEDSANDPHOTODIODES
ThecalculationofMeanTimeBetweenFailure(MTBF)isoftenrequiredasanaidinpredictingthereliabilityofelectronicequipmentunderdifferentoperatingconditions.ThevalueofMTBFforacomponentisbaseduponfailure-ratemodelswhichhavebeendevelopedinconjunctionwithMIL-HDBK-217E.TheMTBFisnotaguaranteeofuseableproductlifetime,butisaguideforplanningtheoperationaluseoftheequipment.Theaccuracyofthevaluescalculatedisdependentuponthevalidityofthemodels.Also,thevalueschosenfortheoperatingparametersmustberepresentativeoftheoperatingparametersduringactualuse.Inthecaseoffiberopticdatacommunicationequipment,anareaofprimaryconcernistheMTBFvaluesforthediscreteLightEmittingDiodes(LEDs)andphotodiodesusedinthefiberoptictransmittersandreceivers.
ThedeterminationofthepredictedMTBFforanLEDorphotodiodeisacalculationusingthepartfailure-ratemodelforoptoelectronicdevicesasfoundinsection5.1.3.10ofMIL-HDBK-217E.Thepartfailure-ratemodel,lP,isasfollows:where:ThevalueforMTBFisthendeterminedfrom:Threeoftheabovementionedfactorsareexplicitlydefinedinsection5.1.3.10ofMIL-HDBK-217E(lB,IIE,andIIQ).Valuesforthesefactors,alongwithdescriptionsofthevariousconditionsidentifiedbyMIL-HDBK-217Earediscussedinthisnote.Thefourthparameter,IIT,maybeobtainedeitherfromtablesprovidedinMIL-HDBK-217Eorfromcalculationsinvolvingparametricdataobtainedfromthedeviceduringactualorsimulatedoperation.IdentificationoftheseparametersandspecificdataapplicabletocomponentsmanufacturedbyHoneywellarealsocontainedinthisapplicationnote.
ThereareseveralsamplecalculationstoaidtheuserindeterminingMTBFvaluesfortheparticularcomponentswhichheisconsidering.Inaddition,thereareanumberoftablesincludedinwhichMTBFvaluesarelistedforvarioustypesofdevicesunderdifferentoperatingconditions.BASEFAILURERATEThedevicebasefailure-rate,lB,isgiveninTable5.1.3.10-3ofMIL-HDBK-217E.ThevaluesforLEDandphotodiodesareshownbelow.BaseFailure-Rate(fromMIL-HDBK-217E,Table5.1.3.10-3)QUALITYFACTORThequalityfactorisgiveninTable5.1.3.10-4ofMIL-HDBK-217E.Thisisreproducedbelowalongwithabriefdescriptionofthevariousqualitylevels.QualityFactors(fromMIL-HDBK-217E,Table5.1.3.10-4)QualityLevelIIQDescriptionJANTXV0.001FulltestingasdefinedbyMIL-S-19500includingScreeningandGroupsA,B,andC.JANTX0.02IdenticaltoJANTXVexceptdoesnotincludethe100%precapvisualinspectioncontainedinScreening.JAN0.1TestingasdefinedbyMIL-S-19500includingGroupsA,B,andC,butnotincludingScreening.LOWER0.5AppliestoallhermeticpackagedLEDsandphotodiodes.PLASTIC1.0Appliestoalldevicesencapsulatedwithorganicmaterials.Productsmeetinganyofthequalitylevelsdefinedinthequalityfactorstable(MIL-HDBK-217E,Table5.1.3.10-4)areavailablefromHoneywell.WhilethereareveryfewfiberoptictypeproductsdefinedbyaslashsheettoMIL-S-19500,atestprogramcanbedesignedwhichwillcarryouttheintentionofMIL-S-19500foranyofthe”metalwindowcan”deviceswhichHoneywelloffers.ApplicationNoteCalculatingMeanTimeBetweenFailureforDiscreteLEDsandPhotodiodesP=BTEQfailures106hoursT=temperaturefactorE=environmentalfactorQ=qualityfactorB=basefailure-ratefailures106hoursMTBF=1PforasingleLED0.0011failures106hoursforaphotodiodeand0.00065failures106hoursB=B=©HoneywellEuropeS.A.Honeywellreservestherighttomakechangesinordertoimprovedesignandsupplythebestproductspossible.
[/quote]
[[i]本帖最后由paulyu于2007-9-2711:19编辑[/i]]
购买了付费内容
,英文的啊,密密麻麻的…
好東西, 累積知識!
感謝!!
😀
對數字真的不強,很難懂!
这另外一个帖子发的东西和这个一样啊?
好东西,谢谢
学习
好东西看不懂
下载看了一下,挺好的学习资料,非常感谢楼主
谢谢分享!!!!!!!!
我晕啊,英文的啊,密密麻麻的…
好东西,珍藏!!!
先看看再说,呵呵
不错哦。thanks
谢
谢
:)好的啊!
我以后注意!
xn_juan,發表下載的東西,盡可能的摘要一些內容出來,便于下載。