Dimensional and structural stability of gamma irradiated stacked die quad flat no leads (QFN)

Siew Peng Foo, Wan Yusmawati Wan Yusoff, Azman Jalar @ Jalil

Research output: Contribution to journalArticle

Abstract

The physical properties and structural stability of the Quad Flat No-Leads (QFN) package with different gamma radiation doses have been investigated. The packages were irradiated with Co-60 gamma radiation with varying doses of 5 Gy, 50 Gy, 500 Gy, 5 kGy and 50 kGy with operating dose of 2.54 kGy/h at room temperature. The infinite focus microscope (IFM) was used to measure the dimensional change and slanting/warpage behaviour, while the 3D CT Scan X-ray machine was used to determine the occurrence of deflection on a wire in package due to exposure. It is believed that radiation effect on ceramic filler in the epoxy mold compound (EMC) plays an important role to induce the defects and resulted in swelling of the package. The slanting/warpage behaviour is believed to be caused by the swelling behaviour of ceramic filler and further induced structural stability. The induced stress on the EMC structural after the dimensional change and slanting/warpage failure leads to the occurrence of wire sweep. The finding suggests that defect production in swelled ceramic filler leads to the occurrence of dimensional and structure instability.

Original languageEnglish
Pages (from-to)827-832
Number of pages6
JournalSains Malaysiana
Volume43
Issue number6
Publication statusPublished - 2014

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dimensional stability
structural stability
warpage
fillers
occurrences
ceramics
swelling
dosage
wire
gamma rays
defects
radiation effects
deflection
physical properties
microscopes
room temperature
x rays

Keywords

  • Dimensional change
  • Gamma radiation
  • Qfn
  • Structure stability

ASJC Scopus subject areas

  • General

Cite this

Dimensional and structural stability of gamma irradiated stacked die quad flat no leads (QFN). / Foo, Siew Peng; Yusoff, Wan Yusmawati Wan; Jalar @ Jalil, Azman.

In: Sains Malaysiana, Vol. 43, No. 6, 2014, p. 827-832.

Research output: Contribution to journalArticle

Foo, Siew Peng ; Yusoff, Wan Yusmawati Wan ; Jalar @ Jalil, Azman. / Dimensional and structural stability of gamma irradiated stacked die quad flat no leads (QFN). In: Sains Malaysiana. 2014 ; Vol. 43, No. 6. pp. 827-832.
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