Abstract: Flexible, adhesive materials are used to secure integrated circuit package components together. The die is secured to the heat sink, the ringframe to the heat sink and the leadframe to the ringframe, using epoxy materials that flex over the operational temperature range of the circuit package. The flexibility of the adhesives accommodates large differences in expansion and contraction of CTE-mismatched materials. The heat sink and ringframe materials are neither restricted to CTE-compatible materials nor to materials that are compatible with high-temperature attachment processes. Adhesive mounting of the die avoids the use of lead-based solders used in typical assembly processes.