Related to completed modules very special and complex, product-internal criteria for monitoring and evaluation must be defined in cooperation with the clients.
Evaluation of goods and process flow
Thus it appears that many factors are mandatory in order to achieve a reliable, safeguarded and all-embracing Long-Term Conservation. All the more, an extensive evaluation of the goods is important at the beginning of the conservation. Beside the evaluation of the visual condition of the goods, tests regarding the layer thickness of the parts in terms of grinding patterns and a light microscopy as well as an examination of the solderability are performed.
In order to make a statement regarding the development of an intermetallic phase, a REM-EDX analysis is performed recording its gradient and intensity systematically. In conclusion, a statement about the specific period for reliable processing of the components is possible. A FTIR-analysis for the determination of the IC packaging material provides further important information for the specification of the absorption criteria.
A lead-free test of the components and, where necessary, a coplanarity check make the evaluation of the goods complete. Related to completed modules very special and complex, product-internal criteria for monitoring and evaluation must be defined in cooperation with the clients.
The result is a frankly communicated, customer-oriented documentation. The relevant inspections are repeated at least once a year and compared with all previous test results. Consequently, a currently adjusted documentation is created and communicated to the clients. This documentation includes the performance related to the evaluation of the condition of the goods and the status of the effectiveness concerning the conservation processes.