Why SiC and GaN Need Their Own Qualification Standards
AI-summarised brief · reviewed before publication
Silicon carbide (SiC) and gallium nitride (GaN) power devices are rapidly entering electric‑vehicle inverters, onboard chargers, solar inverters and data‑center supplies, but the industry still relies on qualification standards—JEDEC JESD47, AEC‑Q101 and JESD22 stress tests—originally devised for silicon. Dr. Pradyumna Gupta of Infinita Lab explains that wide‑bandgap materials exhibit distinct failure mechanisms: SiC basal‑plane dislocations can evolve into stacking faults that cause bipolar degradation, while its gate‑oxide traps and breakdown behavior diverge from silicon models. GaN suffers from charge‑trapping‑induced dynamic on‑resistance shifts (current collapse) and dielectric‑trap‑driven threshold instability. Test conditions also fall short; for example, high‑temperature reverse‑bias testing often uses only 80 % of a device’s rated voltage, leaving many labs applying lower stress. Consequently, published qualification data may appear robust yet fail to predict real‑world degradation, posing a central challenge as power electronics push toward higher voltages, temperatures and frequencies.
💡 Why It Matters
- · Without standards that reflect SiC and GaN’s unique failure modes, manufacturers risk deploying components that under‑perform in critical applications, jeopardizing reliability and safety.
