SEMI G16-88 SPECIFICATION FOR DIMENSIONS AND TOLERANCES USED

《SEMI G16-88 SPECIFICATION FOR DIMENSIONS AND TOLERANCES USED》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、SEMIG16-88N/A©SEMI1983,1996SPECIFICATIONFORDIMENSIONSANDTOLERANCESUSEDTOMANUFACTUREPLASTICCHIPCARRIERTOOLING1Preface3.2.2toporbottomprotrusionsÑThoseplasticexcesses(includesejectorpin"crowns"),whichremainThisdocumentisaguidelinefortheorderingoftool-asanormal

2、characteristicextendingfromthesmoothingrequiredtomoldandformplasticchipcarriers.Itsurfaceofthemoldedpackage.istobeusedbypackagingengineers,moldmanufac-turersandendoflinetoolmakersasthebasisfor3.3variationsinleadlocationÑDefinedwithdeÞningthelimitsofmanufactu

3、ringtolerances.respecttoa90¡anglefromthetoporbottomofthesmoothsurfaceofthemoldedpackageasviewedon2ApplicableDocumentstheendorsideprojections.(SeeFigure6.)Relatedinformationmaybefoundin:3.4leadshoulderprotrusionsandintrusionsÑAnyMIL-STD-1001ÑEngineeringDrawin

4、gPracticesvariationsinstraightnessalongthedefinedshoulderwidthcausedbydambarremoval.(SeeFigure6.)ANSIY14.52ÑDimensioningandTolerancing3.5packagewarpageÑAnynon-lineardimensionalJEDECPublicationNo.953ÑOutlineforSemicon-changefromthemoldcavitycharacteristic,usu

5、allyductorDevicescausedbyincorrectpackagedesignormoldingprac-tices.(SeeFigure3.)3SelectedDeÞnitionsÑProductionCriteriaToleranceLimits3.6shoulderbendlocationÑMeasuredfromtheoutermostpointoftheshoulderbendradius.(SeeFig-3.1mismatchandoffsetÑDefinedwithrespectt

6、oure4.)packageonly.Allstatementswillbeequallyapplicableintwo(2)axes.Allmismatchandoffsetmeasurements3.7leadco-planarityÑDefinedastheverticalleadaremadeaftermoldingandpriortotrimming.positionwithrespecttoareferenceplanemeasuredafterforming.(SeeFigure5.)3.1.1c

7、avitytoframeoffsetÑWillbemeasuredpriortoanytrimmingoperation.OffsetwillbedeÞnedas4OrderingInformationthedifferenceinbottomcavitypositionwithrespecttoPurchaseordersfortoolingforplasticmoldedquadaleadframedatum.Theoffsetmeasurementwillsemiconductorpackagesfurn

8、ishedtothisspeciÞcationexcludeleadframetolerances.(SeeFigure1.)shallincludethefollowingitems:3.1.2toptobottomcavitymismatchÑCharacterized1.Apackagetoolingoutlinedrawingshowingallbythefactthatthe