Silicon carbide (SiC) and gallium nitride (GaN) outperform conventional silicon at high voltage, high frequency, and high temperature. Wolfspeed's SiC handles 1.2kV to over 3.3kV above 150°C, while Texas Instruments' GaN switches at 150 V/ns and above 500 kHz, shrinking magnetics by up to 60% — enabling applications from solar inverters to EV on-board chargers.
What Performance Advantages Do Wide-Bandgap Materials Offer Over Silicon?
Oak Ridge National Laboratory (ORNL) states that wide-bandgap devices perform more efficiently than conventional semiconductor materials across a wider temperature rangeCITE:E1. According to ORNL, the specific advantages of wide-bandgap devices include higher inherent reliability, higher overall efficiency, higher-frequency operation, greater temperature capability and tolerance, lighter weight enabling more compact systems, and higher power densityCITE:E2. These properties form the baseline case for why silicon carbide (SiC) and gallium nitride (GaN) — the two commercialized wide-bandgap materials — are being adopted in place of silicon in power electronics.
How Does Silicon Carbide (SiC) Perform at High Voltage and High Temperature?
Wolfspeed states that silicon carbide (SiC) handles voltages from 1.2kV to more than 3.3kV while operating reliably above 150°CCITE:E3. Wolfspeed says this voltage and temperature range enables high-efficiency energy conversion in solar inverters and wind systems, and reduces cooling requirements in harsh operating environmentsCITE:E3. Separately, Wolfspeed states that higher efficiency and switching frequency in high-voltage SiC systems shrink magnetics, cooling systems, and overall system footprintCITE:E4.
How Does Gallium Nitride (GaN) Enable High-Frequency Switching and Smaller Systems?
Texas Instruments states that its GaN FETs with integrated drivers reach switching speeds of 150 V/nsCITE:E5. Texas Instruments says these faster switching speeds allow its GaN devices to achieve switching frequencies above 500 kHz, which results in magnetics up to 60% smaller, enhanced performance, and lower system costCITE:E6.
| Material | Metric | Value | Entity (Source) |
|---|
| SiC | Voltage range | 1.2kV to 3.3kV+ | WolfspeedCITE:E3 |
| SiC | Operating temperature | Above 150°C | WolfspeedCITE:E3 |
| GaN | Switching speed | 150 V/ns | Texas InstrumentsCITE:E5 |
| GaN | Switching frequency | Above 500 kHz | Texas InstrumentsCITE:E6 |
| GaN | Magnetics size reduction | Up to 60% | Texas InstrumentsCITE:E6 |
Where Are SiC and GaN Deployed Today — EVs, Fast Charging, and Power Conversion?
Texas Instruments states that its GaN power stages are used across a wide range of applications, from telecommunications, servers, and motor drives to laptop adapters and on-board chargers for electric vehiclesCITE:E7. On the SiC side, Wolfspeed points to solar inverters and wind systems as deployment targets for its high-voltage, high-temperature devicesCITE:E3, alongside critical power infrastructure where higher switching frequency shrinks magnetics and cooling systemsCITE:E4.
What This Means
The two materials trace back to the same wide-bandgap properties ORNL identified — higher efficiency, higher frequency, higher temperature tolerance, and higher power densityCITE:E1CITE:E2 — but they are being deployed along different axes. Wolfspeed's SiC data centers on voltage and heat tolerance (1.2kV to 3.3kV+, above 150°C) for solar, wind, and critical power systemsCITE:E3CITE:E4. Texas Instruments' GaN data centers on switching speed and frequency (150 V/ns, above 500 kHz) that cut magnetics size by up to 60% for compact applications including EV on-board chargersCITE:E5CITE:E6CITE:E7. The application lists disclosed by each source do not overlap on EV charging specifics beyond TI's on-board-charger referenceCITE:E7.
Author's Take・林紀旭 James Lin
The specification data point to two distinct engineering trade-offs rather than one material displacing the other. SiC's case rests on thermal and voltage headroom — reliable operation above 150°C at 1.2kV to 3.3kV+ — which fits high-voltage, high-heat infrastructure like solar inverters and critical power systems, not compact consumer electronics. GaN's case rests on switching speed — 150 V/ns enabling frequencies above 500 kHz and magnetics up to 60% smaller — which fits size- and cost-constrained designs, including the on-board EV chargers Texas Instruments lists as a GaN application. The detail worth tracking next is that Wolfspeed's own high-voltage claims center on solar, wind, and critical power rather than EV charging — so which material vendors ultimately pair with EV on-board chargers at scale remains an open question based on what these two sources disclose.