How a single component change helped Tesla shrink the electric vehicle inverter
In 2018, the electric vehicle industry faced a sudden shift in expectations. By adopting silicon carbide-based technology from ST Microelectronics, Tesla managed to reduce the size of a critical component by half, proving that even ancient semiconductor materials can drive modern innovation.
The transition toward silicon carbide (SiC) represents a significant evolution in power electronics. While silicon has long been the industry standard, the adoption of SiC-based inverters—most notably by Tesla for the Model 3 in 2018—demonstrated that this material could drastically optimize hardware. By utilizing SiC, engineers were able to shrink one of the most vital components in an electric vehicle, the inverter, to half its previous size.
The advantages of silicon carbide lie in its ability to transform power conversion systems. However, the transition is not without engineering hurdles. Much of the current packaging and integration technology used in the industry was originally designed for traditional silicon power devices. These conventional methods struggle to fully address the unique requirements of SiC, meaning researchers are now focused on developing new integration methods to unlock the material's full potential.
Silicon carbide is far from a new discovery; its presence in industrial applications dates back decades. As early as November 1946, scientific literature in Nature noted the commercial availability of silicon carbide non-ohmic resistors. At that time, these resistors were recognized for a specific physical property: the current passing through them was proportional to the fourth or fifth power of the voltage. This long history of utility suggests that while the application in modern EV inverters is a recent breakthrough, the fundamental material science has been part of the technological landscape for nearly eighty years.
Source: Silicon Carbide: A Power Electronics Revolution
