The main objective of this study is to develop and demonstrate techniques for rapid reliability assessment of Sn37Pb and Sn3.8Ag0.7Cu solder joint reliability in an engine control unit using the physics-of-failure approach. A virtual qualification was performed to determine the expected life of the Sn37Pb solder joints in an engine control unit under test conditions. Then a calibration/validation of that assessment was performed using the results of a passive thermal cycling test conducted on 24 actual units. After validation of the approach was completed, a virtual qualification was performed on the same engine control unit, except assembled using Sn3.8Ag0.7Cu solder, and the results of the two solders compared. It was found that for testing from -55 Cel to 125 Cel with 15 minute dwells at high and low temperature, the mean time to solder joint failure was 25 % higher for Sn3.8Ag0.7 solder joints than for Sn37Pb solder joints in that engine control unit.
PoF reliability assessment of an engine control unit
Abschätzung der Zuverlässigkeit von Motorsteuergeräten nach der physikalischen Fehlermethode
2007
6 Seiten, 11 Bilder, 2 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch