Abstract
Quad Flat Pack (QFP) Leads/Sn-3.5Ag-X (X = Bi and Cu) joint was thermally cycled between 243 K and 403 K or 273 K and 373 K, and both metallographic examination and mechanical pull test were performed to evaluate thermal fatigue damage of the joint. The addition of bismuth drastically degrades the thermal fatigue resistance of Sn-3.5Ag solder. On the other hand, the pull strength of Sn-3.5Ag-Cu solder joints slightly decreased with increasing number of thermal cycles, though it still remains higher in comparison to that for conventional Sn-37Pb or bismuth containing solder joint. The behavior observed here reflects the isothermal fatigue properties of bulk solder, because thermal fatigue crack initiates at the surface of solder fillet and propagates within the fillet in an early stage of fatigue damage. Furthermore, the lead phases lying at the interface between lead-frame and bismuth containing solder joint may promote the crack propagation at the interface, resulting in the extremely low thermal fatigue resistance of the joint.
| Original language | English |
|---|---|
| Pages (from-to) | 1263-1269 |
| Number of pages | 7 |
| Journal | Journal of Electronic Materials |
| Volume | 28 |
| Issue number | 11 |
| Publication status | Published - 1999 Nov |
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ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy (miscellaneous)
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Effect of thermal cycles on the mechanical strength of quad flat pack leads/Sn-3.5Ag-X (X = Bi and Cu) solder joints. / Kariya, Yoshiharu; Hirata, Yasunori; Otsuka, Masahisa.
In: Journal of Electronic Materials, Vol. 28, No. 11, 11.1999, p. 1263-1269.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of thermal cycles on the mechanical strength of quad flat pack leads/Sn-3.5Ag-X (X = Bi and Cu) solder joints
AU - Kariya, Yoshiharu
AU - Hirata, Yasunori
AU - Otsuka, Masahisa
PY - 1999/11
Y1 - 1999/11
N2 - Quad Flat Pack (QFP) Leads/Sn-3.5Ag-X (X = Bi and Cu) joint was thermally cycled between 243 K and 403 K or 273 K and 373 K, and both metallographic examination and mechanical pull test were performed to evaluate thermal fatigue damage of the joint. The addition of bismuth drastically degrades the thermal fatigue resistance of Sn-3.5Ag solder. On the other hand, the pull strength of Sn-3.5Ag-Cu solder joints slightly decreased with increasing number of thermal cycles, though it still remains higher in comparison to that for conventional Sn-37Pb or bismuth containing solder joint. The behavior observed here reflects the isothermal fatigue properties of bulk solder, because thermal fatigue crack initiates at the surface of solder fillet and propagates within the fillet in an early stage of fatigue damage. Furthermore, the lead phases lying at the interface between lead-frame and bismuth containing solder joint may promote the crack propagation at the interface, resulting in the extremely low thermal fatigue resistance of the joint.
AB - Quad Flat Pack (QFP) Leads/Sn-3.5Ag-X (X = Bi and Cu) joint was thermally cycled between 243 K and 403 K or 273 K and 373 K, and both metallographic examination and mechanical pull test were performed to evaluate thermal fatigue damage of the joint. The addition of bismuth drastically degrades the thermal fatigue resistance of Sn-3.5Ag solder. On the other hand, the pull strength of Sn-3.5Ag-Cu solder joints slightly decreased with increasing number of thermal cycles, though it still remains higher in comparison to that for conventional Sn-37Pb or bismuth containing solder joint. The behavior observed here reflects the isothermal fatigue properties of bulk solder, because thermal fatigue crack initiates at the surface of solder fillet and propagates within the fillet in an early stage of fatigue damage. Furthermore, the lead phases lying at the interface between lead-frame and bismuth containing solder joint may promote the crack propagation at the interface, resulting in the extremely low thermal fatigue resistance of the joint.
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M3 - Article
VL - 28
SP - 1263
EP - 1269
JO - Journal of Electronic Materials
JF - Journal of Electronic Materials
SN - 0361-5235
IS - 11
ER -