CN108886034B - 树脂封装型电力半导体装置的制造方法 - Google Patents
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Abstract
本发明的目的在于提供能够容易地将悬吊引线从模塑树脂以及引线框进行截断的树脂封装型电力半导体装置的制造方法。本发明涉及的树脂封装型电力半导体装置的制造方法具备以下工序:(a)将半导体元件和与该半导体元件电连接的引线框通过模塑树脂进行封装,准备引线框的端子引线以及悬吊引线从模塑树脂的侧面凸出至外部的封装体;(b)在从模塑树脂的一个主面侧朝向与该一个主面相对的另一个主面侧的第1方向上,通过第1冲头对悬吊引线的从模塑树脂凸出的部分进行击打,从模塑树脂将悬吊引线截断;以及(c)在从模塑树脂的另一个主面侧朝向一个主面侧的第2方向上,通过第2冲头对悬吊引线的凸出的部分进行击打,从引线框将悬吊引线截断。
Description
技术领域
本发明涉及树脂封装型电力半导体装置的制造方法。
背景技术
树脂封装型电力半导体装置具备:导体,其层叠在具有散热效果的绝缘基板之上;电力半导体元件,其与导体接合;导线,其将电力半导体元件和端子引线电导通。绝缘基板、导体、电力半导体元件以及导线由模塑树脂进行封装。端子引线从模塑树脂的侧面延伸至外部,其与导线连接的一端侧存在于树脂内,另一端侧存在于树脂外。
另外,树脂封装型也称为传递模塑型。
在制作这种树脂封装型电力半导体装置时,将电力半导体元件与引线框电连接,通过导线将电力半导体元件和端子引线进行连接。
引线框具有端子引线和悬吊引线,该悬吊引线不与半导体元件电连接。悬吊引线是为了在将导线与电力半导体元件、端子引线进行连接的导线键合工序中确保导线键合性而使用的,或者是为了在树脂封装工序中对电力半导体装置进行固定而使用的。在树脂封装工序之后,悬吊引线呈从模塑树脂的侧面凸出至外部的状态,即成为模塑树脂经由悬吊引线与引线框连接的状态。将悬吊引线的从模塑树脂凸出的部分通过冲头等而从模塑树脂以及引线框截断。
以往,公开了将悬吊引线从模塑树脂以及引线框进行截断的技术(例如,参照专利文献1)。
专利文献1:日本特开2013-239625号公报
发明内容
在专利文献1的对比例中,示出了以下情况,即,在通过悬吊引线将模塑树脂和引线框进行连接的状态下,利用冲头通过一次工序将悬吊引线从模塑树脂以及引线框进行截断(参照专利文献1的图7~9)。在这种情况下,产生的问题是,在引线框和悬吊引线之间的截断部分处产生切割毛刺。另一方面,在专利文献1中,为了解决对比例中的上述问题,需要在引线框设置狭缝。
本发明就是为了解决这样的问题而提出的,其目的在于提供能够容易地将悬吊引线从模塑树脂以及引线框进行截断的树脂封装型电力半导体装置的制造方法。
为了解决上述课题,本发明涉及的树脂封装型电力半导体装置的制造方法具备以下工序:工序(a),将半导体元件和与该半导体元件电连接的引线框通过模塑树脂进行封装,准备引线框的端子引线以及悬吊引线从模塑树脂的侧面凸出至外部的封装体;工序(b),在从模塑树脂的一个主面侧朝向与该一个主面相对的另一个主面侧的第1方向上,通过第1冲头对悬吊引线的从模塑树脂凸出的部分进行击打,从模塑树脂将悬吊引线截断;以及工序(c),在从模塑树脂的另一个主面侧朝向一个主面侧的第2方向上,通过第2冲头对悬吊引线的凸出的部分进行击打,从引线框将悬吊引线截断。
发明的效果
根据本发明,树脂封装型电力半导体装置的制造方法具备以下工序:工序(a),将半导体元件和与该半导体元件电连接的引线框通过模塑树脂进行封装,准备引线框的端子引线以及悬吊引线从模塑树脂的侧面凸出至外部的封装体;工序(b),在从模塑树脂的一个主面侧朝向与该一个主面相对的另一个主面侧的第1方向上,通过第1冲头对悬吊引线的从模塑树脂凸出的部分进行击打,从模塑树脂将悬吊引线截断;以及工序(c),在从模塑树脂的另一个主面侧朝向一个主面侧的第2方向上,通过第2冲头对悬吊引线的凸出的部分进行击打,从引线框将悬吊引线截断,因此,能够将悬吊引线从模塑树脂以及引线框容易地进行截断。
本发明的目的、特征、方案以及优点通过以下的详细说明和附图变得更清楚。
附图说明
图1是表示本发明的实施方式涉及的树脂封装型电力半导体装置的一个例子的俯视图。
图2是表示本发明的实施方式涉及的树脂封装型电力半导体装置的制造工序的一个例子的俯视图。
图3是表示本发明的实施方式涉及的树脂封装型电力半导体装置的制造工序的一个例子的剖视图。
图4是表示本发明的实施方式涉及的树脂封装型电力半导体装置的制造工序的一个例子的俯视图。
图5是表示本发明的实施方式涉及的树脂封装型电力半导体装置的制造工序的一个例子的俯视图。
图6是表示本发明的实施方式涉及的树脂封装型电力半导体装置处的悬吊引线的状态的一个例子的剖视图。
图7是表示本发明的实施方式涉及的树脂封装型电力半导体装置处的悬吊引线的状态的一个例子的剖视图。
图8是表示本发明的实施方式涉及的树脂封装型电力半导体装置处的悬吊引线的状态的一个例子的剖视图。
图9是表示以往的树脂封装型电力半导体装置的一个例子的俯视图。
具体实施方式
下面,基于附图对本发明的实施方式进行说明。
<实施方式>
图1是表示本发明的实施方式涉及的树脂封装型电力半导体装置的一个例子的俯视图。
树脂封装型电力半导体装置具备:与铜材料的引线框电连接的作为PW芯片的半导体元件(未图示)以及作为IC芯片的半导体元件(未图示);以及多个导线(未图示),其将引线框的端子引线2和各半导体元件电连接,它们通过模塑树脂1进行封装。端子引线2从模塑树脂1的侧面凸出至外部。多个导线包含粗导线以及细导线。此外,引线框与后述的图2的引线框4对应。
图2~5是表示本实施方式涉及的树脂封装型电力半导体装置的制造工序的一个例子的图。此外,图2~5所示的工序是通过众所周知的连杆切割工序(T/C工序)或者引线切割工序(L/C工序)进行的。
如图2所示,将半导体元件和与该半导体元件电连接的引线框4通过模塑树脂1进行封装,准备引线框4的端子引线2以及悬吊引线3从模塑树脂1的侧面凸出至外部的封装体。
然后,如图3所示,在从模塑树脂1的一个主面即散热面5侧朝向与该散热面相对的另一个主面即上表面6侧的第1方向上,通过第1冲头即冲头7对悬吊引线3的从模塑树脂1凸出的部分进行击打,从模塑树脂1将悬吊引线3截断。此时,如图4所示,悬吊引线3成为虽然被从模塑树脂1截断,但是与引线框4连接的状态。此外,第1方向对应于图3所示的箭头的方向。
然后,在从模塑树脂1的上表面6侧朝向散热面5侧的第2方向,通过第2冲头(未图示)对与引线框4连接的悬吊引线3进行击打,从引线框4对悬吊引线3进行截断。图5示出了将悬吊引线3从引线框4截断之后的状态。
然后,将连结着各端子引线2的引线框4进行截断,调整端子引线2的长度而进行切断等,完成如图1所示这样的树脂封装型电力半导体装置。
图6、7是表示树脂封装型电力半导体装置处的悬吊引线3的状态的一个例子的剖视图。
如果如图3所示通过冲头7将悬吊引线3从模塑树脂1进行截断,则如图6所示,成为悬吊引线3被从模塑树脂1内拔出的状态,即悬吊引线3的前端存在于模塑树脂1内的状态。或者,如图7所示,在模塑树脂1的侧面附近,悬吊引线3的前端朝上且悬吊引线3的前端的散热面5侧成为塌角形状。这里,塌角形状如图7所示,是指悬吊引线3的前端沿一定的方向弯曲的形状。
由此,本实施方式涉及的树脂封装型电力半导体装置成为悬吊引线3不从模塑树脂1凸出的构造。这里,悬吊引线3不从模塑树脂1凸出的构造如图8所示,是指相比于由虚线表示的模塑树脂1的散热面侧的侧面的延长线,悬吊引线3的前端存在于模塑树脂1侧这样的构造。
如上所述,在制作树脂封装型电力半导体装置时,设置悬吊引线是为了,在利用细导线将半导体元件和端子引线2连接的导线键合工序中,消除引线框4的错位而确保导线键合性。
如图9所示,以往,悬吊引线11是在形成模塑树脂9之后通过连杆切割工序或者引线切割工序进行切断,但是,切断之后的悬吊引线11以从模塑树脂9凸出的状态残留下来。
原本,悬吊引线不与半导体元件电连接,绝缘性得到了保证。但是,近年来,由于半导体元件的高耐压化以及产品的小型化的进步,在树脂封装型电力半导体装置的散热面安装的冷却器和悬吊引线之间的沿面距离变短,由此,易于产生绝缘不良。另外,如果悬吊引线从模塑树脂凸出,则存在由于树脂封装型电力半导体装置的加工之后或者安装时等的操作而发生变形的可能性,存在悬吊引线通电或者树脂封装型电力半导体装置的绝缘性降低的担忧。
另一方面,在本实施方式中,在截断后的悬吊引线3的前端处于如图6所示这样的存在于模塑树脂1内的状态的情况下,能够抑制向锐利的悬吊引线3的前端的电场集中。另外,通过如图6、7所示使得悬吊引线3的前端不从模塑树脂1凸出,能够防止由于变形导致的通电。
另外,就截断后的悬吊引线3的前端而言,在如图7所示的在模塑树脂1的侧面附近悬吊引线3的前端朝上、且悬吊引线3的前端的散热面5侧成为塌角形状的情况下,能够使锐利的悬吊引线3的前端与散热面5远离,因此,能够确保针对散热面5的绝缘耐压。在这种情况下,例如如图8所示,通过使散热面5与悬吊引线3的散热面5侧的面之间的距离即空间距离8大于等于1.6mm,能够确保绝缘耐压大于等于2.0kVrms。
另外,如图3所示,在从散热面5朝向上表面6的方向上,通过冲头7对悬吊引线3进行击打,将悬吊引线3从模塑树脂1截断,因此,模塑树脂1的比悬吊引线3更靠散热面5侧的部分缺损的可能性降低。由此,降低由于缺损等问题等而使得沿面距离无法得到保持的可能性。
另外,在将悬吊引线3从模塑树脂1以及引线框4进行截断时,首先在从散热面5朝向上表面6的方向上,即在自下而上的方向上,通过冲头7对悬吊引线3进行击打,将悬吊引线3从模塑树脂1截断,然后,在从上表面6朝向散热面5的方向上,即在自上而下的方向上,通过冲头对悬吊引线3进行击打,将悬吊引线3从引线框4截断,由此,能够容易地将悬吊引线从模塑树脂以及引线框截断,并且能够将不需要的引线即悬吊引线3向下顺利地废弃。
此外,在本实施方式中,将图1示出的树脂封装型电力半导体装置作为一个例子进行了说明,但是,不限定于此。无论模塑树脂的形状或者引线框处的悬吊引线的配置如何,都能够应用。
此外,本发明能够在本发明的范围内对实施方式适当地进行变形、省略。
对于本发明进行了详细说明,但上述说明在所有方面均为例示,本发明不限定于此。可以理解为在不脱离该发明的范围的情况下能够想到未例示出的无数的变形例。
标号的说明
1模塑树脂,2端子引线,3悬吊引线,4引线框,5散热面,6上表面,7冲头,8空间距离,9模塑树脂,10端子引线,11悬吊引线。
Claims (3)
1.一种树脂封装型电力半导体装置的制造方法,其具备以下工序:
工序(a),将半导体元件和与该半导体元件电连接的引线框通过模塑树脂进行封装,准备所述引线框的端子引线以及悬吊引线从所述模塑树脂的侧面凸出至外部的封装体;
工序(b),在从所述模塑树脂的一个主面侧朝向与该一个主面相对的另一个主面侧的第1方向上,通过第1冲头对所述悬吊引线的从所述模塑树脂凸出的部分进行击打,从所述模塑树脂将所述悬吊引线截断;以及
工序(c),在从所述模塑树脂的所述另一个主面侧朝向所述一个主面侧的第2方向上,通过第2冲头对所述悬吊引线的所述凸出的部分进行击打,从所述引线框将所述悬吊引线截断,
所述一个主面是所述模塑树脂的散热面,
在所述工序(b)之后,进行所述工序(c)。
2.根据权利要求1所述的树脂封装型电力半导体装置的制造方法,其特征在于,
在所述工序(b)中,以使得存在于所述模塑树脂内的所述悬吊引线的所述截断侧的前端不从所述模塑树脂凸出的方式进行所述截断。
3.根据权利要求1所述的树脂封装型电力半导体装置的制造方法,其特征在于,
所述模塑树脂的所述一个主面与所述悬吊引线的所述一个主面侧的面之间的距离大于或等于1.6mm。
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