Leadframe SiP with Conformal Shield
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초록
System In Package (SiP) is getting popular and momentum for the recent wearable, IoT and connectivity application apart from mobile phone. This is driven by market demands of cost competitive, lighter and smaller/thinner and higher performance. As one of many semiconducting assembly products, Leadframe product has been widely used for low cost solution, light/ small and thin form factor. But It has not been applied for SiP although Leadframe product has many advantages in cost, size and reliability performance. SiP is mostly based on laminate substrate and technically difficult on Leadframe substrate because of a limitation in SMT performance. In this paper, Leadframe based SiP product has been evaluated about key technical challenges in SMT performance and electrical shield technology. Mostly Leadframe is considered not available to apply EMI shield because of tie-bar around package edge. In order to overcome two major challenges, connection bars were deployed properly for SMT pad to pad and additional back-side etching was implemented after molding process to achieve electrical isolation from outer shield coating. This product was confirmed assembly workability as well as reliability.
Abstract
System In Package (SiP) is getting popular and momentum for the recent wearable, IoT and connectivity application apart from mobile phone. This is driven by market demands of cost competitive, lighter and smaller/thinner and higher performance. As one of many semiconducting assembly products, Leadframe product has been widely used for low cost solution, light/ small and thin form factor. But It has not been applied for SiP although Leadframe product has many advantages in cost, size and reliability performance. SiP is mostly based on laminate substrate and technically difficult on Leadframe substrate because of a limitation in SMT performance. In this paper, Leadframe based SiP product has been evaluated about key technical challenges in SMT performance and electrical shield technology. Mostly Leadframe is considered not available to apply EMI shield because of tie-bar around package edge. In order to overcome two major challenges, connection bars were deployed properly for SMT pad to pad and additional back-side etching was implemented after molding process to achieve electrical isolation from outer shield coating. This product was confirmed assembly workability as well as reliability.
참고문헌 (4)
- S. K. Saha, "Emerging business trends in the semiconductor industry", Proc. Technology Management in the IT-Driven Services (PICMET), pp.2744~ (2013), IEEE
- E. McGibney, "An overview of electrical characterization techniques and theory for IC packages and interconnects", IEEE Transactions on Advanced Packaging, 29(1), pp.131~ (2006), IEEE Components Packaging and Manufacturing Technology Society
- S.-H. Hong, "Characteristics of Lead Frame Chip Scale Package (LF-CSP)", Proc. 1st Korea-Japan Advanced Semiconductor Packaging Technology Seminar, pp.63~ (1999), International Microelectronics and Packaging Society Conference
- 김병진, "RtMLF(Routable Molded Lead Frame) 패키지 소개 및 응용", 마이크로전자 및 패키징학회지, 22(2), pp.41~45 (2015), 한국마이크로전자및패키징학회[DOI]