The rated current of a silicon carbide diode is the main nominal value of a silicon carbide diode, such as a 5A/100V diode, and 5A is the rated current. Generally, the rated current is defined as the average of the rated current that the silicon carbide diode can pass. However, some tests are square waves, that is, a square wave current of 5A between 010 and 10009 can be passed. Some tests require DC, which is 5 amperes of DC current. Theoretically, a silicon carbide diode with a square wave as the test condition can pass a larger DC current, because a square wave with the same level of current will cause greater loss to the silicon carbide diode than a DC current. So, can a 5A silicon carbide diode pass a 5A current? Not necessarily, it is related to temperature. When your heat dissipation conditions are not good enough, the current that the silicon carbide diode can pass will be limited by the junction temperature.
When the silicon carbide diode is turned off in the reverse direction, it can withstand a certain back pressure, so the highest back pressure it can withstand is the rated voltage. For example, the rated reverse voltage of a 5A/100V silicon carbide diode is 100V. Although all silicon carbide diode manufacturers have a certain margin, 100-volt silicon carbide diodes usually use 110 volts without problems, but it is not recommended to use them, because the manufacturers will not guarantee their reliability if they exceed the rated value. The problem is your problem. In addition, many power supply design companies will reduce the design to ensure reliability.
The switching power supply requires silicon carbide diodes to withstand large inrush currents and will not be damaged under startup or other transient conditions. Of course, the inrush current should be non-repetitive or have a long interval. Generally speaking, the data manual of silicon carbide diode has defined this kind of impulse current, and its test condition is usually a single waveform impulse current, such as a single sine wave or a square wave. Its current value can usually reach several hundred.
The silicon carbide diode is not perfectly cut off when it is reversely cut off. When subjected to back pressure, some small current will leak from the cathode to the anode. The current is usually very small, the higher the reverse voltage, the greater the leakage current, and the higher the temperature, the greater the leakage current. Large leakage currents can cause large losses, especially in high voltage applications. Silicon carbide diodes are diodes made of silicon carbide. At present, the most common high-voltage Schottky silicon carbide diodes have good reverse recovery characteristics, which are comparable to Schottky silicon diodes. But it can be used as a high voltage diode. It has been widely used in PFC.
The above explanation is the basic introduction of silicon carbide diodes. I hope it will be helpful to you after reading it. If you want to learn more about silicon carbide diodes, please contact customer service online or call our company's service hotline ( The upper right corner of the website) for consultation, we will be happy to provide you with quality service!