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Power semiconductors

We have SiC MOSFETs from ROHM in our range.

What are power semiconductors?

Power semiconductors are semiconductor components that can be thought of as "electronic valves". They can switch very high currents almost without wear and extremely quickly (compared to relays). Voltages of up to approx. 1,700 V and currents in the range of 120 A are possible. Since the on-resistance is not zero (which would be the ideal scenario) but in the range of 2–3-digit milliohms, these devices are lossy. Therefore, it is an aim of the manufacturers to keep this RDS-on as low as possible. Power semiconductors are available in various designs. The technologies GaN, MOS-FET and SicMOS-FET are common.

Which power semiconductors do we have in our portfolio?

SiC-MOSFETs from ROHM eliminate tail current during switching, resulting in faster operation, lower switching losses and increased stability. The lower on-state resistance and compact chip size result in reduced capacitance and gate charge. In addition, SiC has excellent material properties, such as only a minimal increase in on-state resistance, and enables greater package miniaturisation than silicon devices, where on-resistance can more than double with increasing temperature. The fourth generation of SiC-MOS from ROHM have an industry-leading low on-resistance, with improved short-circuit strength.

Applications of power semiconductors

Power semiconductors are found wherever power has to be switched.


  • A simple mains adapter for mobile phones
  • Power supply units
  • Converters for motors and drives
  • Transport systems
  • Charging stations for electric bikes
  • Quick-charging stations for e-mobility

Advantages of power semiconductors

Without modern power semiconductors, the miniaturisation of electrical devices would be unthinkable. High switching frequencies, a compact design and almost wear-free operation are the outstanding advantages of these components.