10 interview questions and answers on GaN and SiC Devices

Here’s a list of questions and answers about the GaN and SiC Devices. This guide can help you prepare for job interviews for GaN and SiC Devices skill requirements.

List of 10 GaN and SiC Devices Questions and Answers

Question 1: What are GaN and SiC devices used for?

Answer 1: Both are wide bandgap semiconductors used in high efficiency power conversion systems like EV chargers, solar inverters and 5G.

Question 2: Mention key difference between GaN and SiC.

Answer 2: GaN excels in high frequency, low voltage applications, while SiC is better suited for high voltage, high temperature environments.

Question 3: What is the switching speed comparison between GaN and SiC?

Answer 3: GaN has a higher electron mobility, offering faster switching speeds and lower gate charge losses than SiC.

Question 4: Which is better for automotive EV inverters : GaN or SiC?

Answer 4: SiC is preferred in high voltage automotive inverters due to its thermal robustness and higher breakdown voltage.

Question 5: Mention advantages of GaN in power electronics.

Answer 5: GaN offers compact design, high efficiency and reduced parasitic losses, ideal for mobile and telecom power converters.

Question 6: Mention advantages of SiC devices.

Answer 6: SiC offers high breakdown strength, excellent thermal conductivity and supports operation at >1200 V, making it ideal for industrial applications.

Question 7: What are thermal challenges in GaN vs SiC?

Answer 7: GaN has lower thermal conductivity than SiC, making thermal management more critical in high power applications.

Question 8: Why are wide bandgap materials like GaN and SiC revolutionary?

Answer 8: They enable smaller, faster and more efficient power systems, outperforming traditional silicon in high power scenarios.

Question 9: Which device is more mature in commercial deployment?

Answer 9: SiC is more mature and widely adopted in automotive and energy sectors, while GaN is growing in low to mid power applications.

Question 10: Which offers better cost performance at scale: GaN or SiC?

Answer 10: GaN tends to be cost effective in consumer electronics, while SiC justifies its higher cost in high reliability industrial applications.