Curtis W Mitchell

Title: Innovations by Curtis W Mitchell in Semiconductor Technologies

Introduction

Curtis W Mitchell is a notable inventor based in Phoenix, AZ, with a solid portfolio that includes five patents. His innovative contributions primarily revolve around advancements in semiconductor technologies, significantly aiding in the manufacturing processes that enhance efficiency and reliability in electronic components.

Latest Patents

Among his latest inventions is the **Silver flashing process on semiconductor leadframes**. This innovative process involves applying a thin layer of silver on metal leadframes without the use of mask steps, using a minimal amount of silver. The unmasked metal leadframe is immersed in a cleaning bath containing silver in solution, which operates without external electrical assistance to help with the plating. This method allows for the removal of the leadframe once a uniform silver layer, measuring between 100 to 1000 angstroms, is achieved, with flexibility in timing during the plating process due to the non-critical nature of the layer thickness.

Another significant invention by Mitchell is the **Gold metallization process**, which outlines a one-step method for applying a layer of gold or gold alloy to the back of a silicon substrate. This technique facilitates strong bonding between the substrate and its metallized package member. During the application, the substrate is maintained at temperatures ranging from approximately 200°C to 360°C. After the gold is deposited, the substrate is rapidly cooled to room temperature. This careful management of thickness and temperature ensures that the silicon diffusion profile is effectively contained within the gold film, thereby promoting optimal adhesion and producing a pure gold surface layer essential for ideal bonding.

Career Highlights

Curtis W Mitchell has developed a strong reputation in the field through his association with Motorola Corporation, where he has made significant strides in semiconductor technology. His expertise in metallization processes is particularly notable for its impact on enhancing semiconductor production and performance.

Collaborations

Throughout his career, Curtis has worked alongside esteemed colleagues such as Howard M Berg and Gary L Lewis, contributing to collaborative innovations that have propelled advancements in semiconductor applications.

Conclusion

In summary, Curtis W Mitchell has established himself as a key innovator in the semiconductor industry through his pioneering patents, particularly in the areas of silver and gold metallization processes. His work not only reflects his expertise but also his commitment to improving the functionality and reliability of semiconductor components, which remains crucial to modern electronic devices.