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National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
Solder Joint Conductivity - Influence of Solder Volume and Isothermal Aging
 Mach, Ladislav ; Schnederle, Petr (referee) ; Starý, Jiří (advisor)
The master thesis analyses electrical conductivity of lead-free solder joints. The test method design for monitoring the electrical conductivity of the soldered joint is described in the practical part. Simulated BGA package with four pin (BGA4) is used for experiments. Tested PCBs are subjected to isothermal aging and current load. During isothermal aging is measured electrical conductivity and optical microscope is used for intermetallic layer (IMC) growth observation. Two types of surface finish (OSP and ENIG) are used for tests and three diameters of solder terminal balls (solder alloy SAC405). The influence of the ratio area connection / solder volume (ratio S / V) on lead-free solder joints conductivity was evaluated.
Detailed record
Research of reliability of solder ball terminals on BGA packages attached by innovative method
 Gregor, Adam ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
This master´s thesis deals with the investigation of the reliability and service life of solder bumps on BGA packages created using new method using directly heated stencil. The methodology of reliability tests using isothermal and cyclic thermal aging of solder ball terminals was proposed. Test samples of BGA packages were created using this new method of reflow solder bumps and then was statistically evaluated. The internal structure and crystallographic orientation of the planes were investigated.
Detailed record
Research of reliability of solder ball terminals on BGA packages attached by innovative method
 Gregor, Adam ; Jankovský, Jaroslav (referee) ; Otáhal, Alexandr (advisor)
This master´s thesis deals with the investigation of the reliability and service life of solder bumps on BGA packages created using new method using directly heated stencil. The methodology of reliability tests using isothermal and cyclic thermal aging of solder ball terminals was proposed. Test samples of BGA packages were created using this new method of reflow solder bumps and then was statistically evaluated. The internal structure and crystallographic orientation of the planes were investigated.
Detailed record
Solder Joint Conductivity - Influence of Solder Volume and Isothermal Aging
 Mach, Ladislav ; Schnederle, Petr (referee) ; Starý, Jiří (advisor)
The master thesis analyses electrical conductivity of lead-free solder joints. The test method design for monitoring the electrical conductivity of the soldered joint is described in the practical part. Simulated BGA package with four pin (BGA4) is used for experiments. Tested PCBs are subjected to isothermal aging and current load. During isothermal aging is measured electrical conductivity and optical microscope is used for intermetallic layer (IMC) growth observation. Two types of surface finish (OSP and ENIG) are used for tests and three diameters of solder terminal balls (solder alloy SAC405). The influence of the ratio area connection / solder volume (ratio S / V) on lead-free solder joints conductivity was evaluated.
Detailed record

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