Solving Flip Chip Die Crack Issues with Reflow Oven Solutions

This case study details the technical challenges faced by a global OSAT client during the flip chip reflow process, specifically die crack issues that threatened production quality. The client, relying on Heller Industries' reflow ovens, sought immediate support after experiencing these issues. The problem was identified as thermal stress due to rapid cooling rates, which induced die cracks. Heller's solution involved switching to a more advanced oven model, the 2020MKIII, and implementing an external cooling module to extend the cooling duration while managing the cooling rate. The engineering team developed design modifications to enhance temperature control, including antagonist temperature control mechanisms and optimized airflow designs. After testing and fine-tuning, the cooling rate was successfully reduced to meet the client's specifications. The outcome was a defect-free production process, leading to increased production capacity and the delivery of over 300 ovens to the client, showcasing Heller's commitment to solving complex semiconductor manufacturing challenges.