CN102738017A - 一种基于喷砂的aaqfn产品的二次塑封制作工艺 - Google Patents

一种基于喷砂的aaqfn产品的二次塑封制作工艺 Download PDF

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CN102738017A
CN102738017A CN2012101926018A CN201210192601A CN102738017A CN 102738017 A CN102738017 A CN 102738017A CN 2012101926018 A CN2012101926018 A CN 2012101926018A CN 201210192601 A CN201210192601 A CN 201210192601A CN 102738017 A CN102738017 A CN 102738017A
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plastic packaging
sandblast
aaqfn
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罗育光
郭小伟
崔梦
马勉之
谌世广
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Huatian Technology Xian Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/26Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L2224/31Structure, shape, material or disposition of the layer connectors after the connecting process
    • H01L2224/32Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
    • H01L2224/321Disposition
    • H01L2224/32151Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/32221Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/32245Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42Wire connectors; Manufacturing methods related thereto
    • H01L2224/47Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481Disposition
    • H01L2224/48151Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48245Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
    • H01L2224/48247Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732Location after the connecting process
    • H01L2224/73251Location after the connecting process on different surfaces
    • H01L2224/73265Layer and wire connectors
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/91Methods for connecting semiconductor or solid state bodies including different methods provided for in two or more of groups H01L2224/80 - H01L2224/90
    • H01L2224/92Specific sequence of method steps
    • H01L2224/922Connecting different surfaces of the semiconductor or solid-state body with connectors of different types
    • H01L2224/9222Sequential connecting processes
    • H01L2224/92242Sequential connecting processes the first connecting process involving a layer connector
    • H01L2224/92247Sequential connecting processes the first connecting process involving a layer connector the second connecting process involving a wire connector
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
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    • H01L24/00Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
    • H01L24/73Means for bonding being of different types provided for in two or more of groups H01L24/10, H01L24/18, H01L24/26, H01L24/34, H01L24/42, H01L24/50, H01L24/63, H01L24/71
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/15Details of package parts other than the semiconductor or other solid state devices to be connected
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Abstract

本发明涉及一种基于喷砂的AAQFN产品的二次塑封制作工艺,属于集成电路封装技术领域;本发明先在框架上用喷砂的方法形成凹槽,然后采用二次塑封的方法,在一次塑封的塑封料和框架间形成更加有效的防拖拉结构,使集成电路框架与塑封体结合更加牢固,不受外界环境影响,直接提高产品的封装可靠性,同时,简单易行,生产效率高,降低成本。

Description

一种基于喷砂的AAQFN产品的二次塑封制作工艺
技术领域
本发明涉及一种扁平封装件塑封工序中的改良工艺,尤其是一种基于喷砂的AAQFN产品的二次塑封制作工艺,属于集成电路封装技术领域。
背景技术
集成电路是信息产业和高新技术的核心,是经济发展的基础。集成电路封装是集成电路产业的主要组成部分,它的发展一直伴随着其功能和器件数的增加而迈进。自20世纪90年代起,它进入了多引脚数、窄间距、小型薄型化的发展轨道。无载体栅格阵列封装(即AAQFN)是为适应电子产品快速发展而诞生的一种新的封装形式,是电子整机实现微小型化、轻量化、网络化必不可少的产品。
无载体栅格阵列封装元件,底部没有焊球,焊接时引脚直接与PCB板连接,与PCB的电气和机械连接是通过在PCB焊盘上印刷焊膏,配合SMT回流焊工艺形成的焊点来实现的。该技术封装可以在同样尺寸条件下实现多引脚、高密度、小型薄型化封装,具有散热性、电性能以及共面性好等特点。
AAQFN封装产品适用于大规模、超大规模集成电路的封装。AAQFN封装的器件大多数用于手机、网络及通信设备、数码相机、微机、笔记本电脑和各类平板显示器等高档消费品市场。掌握其核心技术,具备批量生产能力,将大大缩小国内集成电路产业与国际先进水平的差距,该产品有着广阔市场应用前景。
但是由于技术难度等限制,目前AAQFN产品在市场上的推广有一定难度,尤其是在可靠性方面,直接影响产品的使用及寿命,已成为AAQFN封装件的技术攻关难点。
发明内容
为了克服上述现有技术存在的问题,本发明提供一种基于喷砂的AAQFN产品的二次塑封制作工艺,使集成电路框架与塑封体结合更加牢固,不受外界环境影响,直接提高产品的封装可靠性,同时降低成本。
为了实现上述目的,本发明采用一种基于喷砂的AAQFN产品的二次塑封制作工艺,先在框架上用喷砂的方法形成凹槽,然后采用二次塑封的方法,具体制作工艺按照如下步骤进行:
第一步、晶圆减薄;晶圆减薄厚度为50μm~200μm,粗糙度Ra 0.10um~0.30um;
第二步、划片;
第三步、采用粘片胶上芯;
第四步、压焊;
第五步、采用传统塑封料进行一次塑封;
第六步、后固化;
第七步、框架背面喷砂形成凹槽;用喷砂的方法在框架背面形成凹槽,深度控制在框架厚度的一半以内;
第八步、二次塑封;
第九步、后固化、磨胶、锡化、打印、产品分离、检验、包装、入库。
所述的方法中的第二步中150μm以上的晶圆采用普通QFN划片工艺;厚度在150μm以下晶圆,采用双刀划片机及其工艺;所述的方法中的第三步中上芯时采用的粘片胶可以用胶膜片(DAF)替换;所述的方法中的第八步二次塑封中使用30~32um颗粒度的塑封料填充;所述的方法中的第四步、第六步、第九步、均与常规AAQFN工艺相同。
本发明的有益效果:本发明先在框架上用喷砂的方法形成凹槽,然后采用二次塑封的方法,在一次塑封的塑封料和框架间形成更加有效的防拖拉结构,使集成电路框架与塑封体结合更加牢固,不受外界环境影响,直接提高产品的封装可靠性,同时,简单易行,生产效率高,降低成本。
附图说明
图1为本发明中引线框架剖面图;
图2为本发明中上芯后产品剖面图;
图3为本发明中压焊后产品剖面图;
图4为本发明中一次塑封后产品剖面图;
图5为本发明中框架背面蚀刻后产品剖面图。
图中:1-引线框架、2-粘片胶、3-芯片、4-键合线、5-塑封体、6-蚀刻凹槽。
具体实施方式
下面结合附图1-5和实施例对本发明做进一步说明,以方便技术人员理解。
实施例1
先在框架上用喷砂的方法形成凹槽,然后采用二次塑封的方法,具体制作工艺按照如下步骤进行:
第一步、晶圆减薄;晶圆减薄厚度为50μm,粗糙度Ra 0.10um;
第二步、采用双刀划片机及其工艺进行划片;
第三步、采用粘片胶上芯;
第四步、采用与常规AAQFN工艺相同的方法进行压焊;
第五步、采用传统塑封料进行一次塑封;
第六步、采用与常规AAQFN工艺相同的方法进行后固化;
第七步、框架背面喷砂形成凹槽;用喷砂的方法在框架背面形成凹槽,深度控制在框架厚度的一半以内;
第八步、二次塑封;使用30um颗粒度的塑封料填充;
第九步、采用与常规AAQFN工艺相同的方法进行后固化、磨胶、锡化、打印、产品分离、检验、包装、入库。
实施例2
先在框架上用喷砂的方法形成凹槽,然后采用二次塑封的方法,具体制作工艺按照如下步骤进行:
第一步、晶圆减薄厚度为130μm,粗糙度Ra为0.20um;
第二步、采用双刀划片机及其工艺进行划片;
第三步、采用胶膜片(DAF)上芯;
第四步、采用与常规AAQFN工艺相同的方法进行压焊;
第五步、采用传统塑封料进行一次塑封;
第六步、采用与常规AAQFN工艺相同的方法进行后固化;
第七步、框架背面喷砂形成凹槽;用喷砂的方法在框架背面形成凹槽,深度控制在框架厚度的一半以内;
第八步、二次塑封;使用31um颗粒度的塑封料填充;
第九步、采用与常规AAQFN工艺相同的方法进行后同化、磨胶、锡化、打印、产品分离、检验、包装、入库。
实施例3
先在框架上用喷砂的方法形成凹槽,然后采用二次塑封的方法,具体制作工艺按照如下步骤进行:
第一步、晶圆减薄厚度为200μm,粗糙度Ra为0.30um;
第二步、采用普通QFN划片工艺进行划片;
第三步、采用胶膜片(DAF)上芯;
第四步、采用与常规AAQFN工艺相同的方法进行压焊;
第五步、采用传统塑封料进行一次塑封;
第六步、采用与常规AAQFN工艺相同的方法进行后固化;
第七步、框架背面喷砂形成凹槽;用喷砂的方法在框架背面形成凹槽,深度控制在框架厚度的一半以内;
第八步、二次塑封;使用32um颗粒度的塑封料填充;
第九步、采用与常规AAQFN工艺相同的方法进行后固化、磨胶、锡化、打印、产品分离、检验、包装、入库。
传统冲压框架在塑封工序塑封料填充后,由于框架本身平整光滑,塑封料与框架之间的结合度低,极易出现分层的情况,封装件可靠性得不到保证。本发明采用的不同于以往的塑封工艺,在框架上用喷砂的方法形成凹槽后,采用二次塑封的方法在框架与一次塑封料、二次塑封料之间形成有效的防拖拉结构,大大降低封装件分层情况的发生几率,极大提高产品可靠性,优于传统AQQFN产品的塑封效果。

Claims (5)

1.一种基于喷砂的AAQFN产品的二次塑封制作工艺,其特征在于:先在框架上用喷砂的方法形成凹槽,然后采用二次塑封的方法,具体制作工艺按照如下步骤进行:
第一步、晶圆减薄;晶圆减薄厚度为50μm~200μm,粗糙度Ra 0.10um~0.30um;
第二步、划片;
第三步、采用粘片胶上芯;
第四步、压焊;
第五步、采用传统塑封料进行一次塑封;
第六步、后固化;
第七步、框架背面喷砂形成凹槽;用喷砂的方法在框架背面形成凹槽,深度控制在框架厚度的一半以内;
第八步、二次塑封;
第九步、后固化、磨胶、锡化、打印、产品分离、检验、包装、入库。
2.根据权利要求1所述的一种基于喷砂的AAQFN产品的二次塑封制作工艺,其特征在于:所述的方法中的第二步中150μm以上的晶圆采用普通QFN划片工艺;厚度在150μm以下晶圆,采用双刀划片机及其工艺。
3.根据权利要求1所述的一种基于喷砂的AAQFN产品的二次塑封制作工艺,其特征在于:所述的方法中的第三步中上芯时采用的粘片胶用胶膜片(DAF)替换。
4.根据权利要求1所述的一种基于喷砂的AAQFN产品的二次塑封制作工艺,其特征在于:所述的方法中的第八步二次塑封中使用30~32um颗粒度的塑封料填充。
5.根据权利要求1所述的一种基于喷砂的AAQFN产品的二次塑封制作工艺,其特征在于:所述的方法中的第四步、第六步、第九步均与常规AAQFN工艺相同。
CN2012101926018A 2012-06-13 2012-06-13 一种基于喷砂的aaqfn产品的二次塑封制作工艺 Pending CN102738017A (zh)

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CN103021884A (zh) * 2012-12-10 2013-04-03 华天科技(西安)有限公司 一种基于薄型框架的扁平封装件制作工艺
CN103021885A (zh) * 2012-12-10 2013-04-03 华天科技(西安)有限公司 一种基于喷砂的扁平封装件制作工艺

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CN102365737A (zh) * 2009-03-30 2012-02-29 凸版印刷株式会社 半导体元件用基板的制造方法及半导体器件
CN101958300B (zh) * 2010-09-04 2012-05-23 江苏长电科技股份有限公司 双面图形芯片倒装模组封装结构及其封装方法

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Publication number Priority date Publication date Assignee Title
CN101826501A (zh) * 2009-03-06 2010-09-08 李同乐 高密度接点的无引脚集成电路元件
CN102365737A (zh) * 2009-03-30 2012-02-29 凸版印刷株式会社 半导体元件用基板的制造方法及半导体器件
CN101958300B (zh) * 2010-09-04 2012-05-23 江苏长电科技股份有限公司 双面图形芯片倒装模组封装结构及其封装方法
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103021884A (zh) * 2012-12-10 2013-04-03 华天科技(西安)有限公司 一种基于薄型框架的扁平封装件制作工艺
CN103021885A (zh) * 2012-12-10 2013-04-03 华天科技(西安)有限公司 一种基于喷砂的扁平封装件制作工艺

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