Reengineering Core Packages for Automotive: Materials, Design, and Interconnect Evolution

Semiconductor packages are evolving rapidly to meet the stringent demands of automotive electronics. Quad Flat No-Lead (QFN), thin-shrink small-outline package (TSSOP), small outline integrated circuit (SOIC), and ball grid array (BGA) designs are popular in automotive applications, widely used for analog, radio frequency (RF), and microcontroller (MCU) devices due to their reliability, manufacturability, and cost-effectiveness.

This paper presents enhancements made to semiconductor packages for automotive-grade applications. It begins by examining specialized material sets, including the latest variations of copper bond wires, epoxy mold compounds, die attach materials, and lead frame finishes. These components are engineered to meet rigorous standards such as AEC-Q006 and ensure robust field performance under harsh operating conditions.

Then, it explores design features for leadframes and substrates that help improve package reliability. Variations of wettable flanks – dimpled, step-cut, and immersion tin – are discussed, highlighting their respective advantages and trade-offs in terms of manufacturability, inspection capability, and solderability. In parallel, it addresses the growing adoption of advanced interconnects in package formats like QFN, driven by the need to reduce electromagnetic interference (EMI) in applications such as switching DC/DC converters, in alignment with International Special Committee on Radio Interference (CISPR) standards.

Finally, it examines traceability requirements for automotive-grade packages. Features such as 2D identification (ID) and unit-level traceability (ULT) are increasingly integrated to monitor and record the history of each unit throughout the assembly process, enabling precise tracking and identification of product defects and commonalities.

By covering these topics, this paper aims to provide attendees with a holistic understanding of how semiconductor packages are being reengineered to meet the rigorous demands of today’s automotive systems.