Information about USB interface voltage can be summarized as follows:
Standard voltage: The standard voltage of the USB interface is 5V. This is set according to the USB specification and is applicable to standards such as USB2.0 and USB3.0. In addition, USB3.0 also supports 9V and 12V voltages, and these higher voltages are mainly used for fast charging functions.
Voltage range: In practical applications, due to the influence of various factors, the voltage of the USB interface may fluctuate. The industry accepted tolerance is +/-0.25V, so normally the voltage of the USB interface should be between 4.75V and 5.25V. Although sometimes the equipment can work at a voltage slightly below 4.75V, the voltage should not be lower than 3.2V to ensure stable operation of the equipment.
Current requirements: In addition to voltage, the current of the USB interface is also an important parameter. Under normal circumstances, the current requirement of the USB interface is not greater than 500mA. However, in some cases, such as when using the USB3.0 fast charging feature, the current may be higher.
To sum up, the standard voltage of the USB interface is 5V, but it may fluctuate between 4.75V and 5.25V in actual use. At the same time, when using the USB interface, it is also necessary to pay attention to the current requirements to ensure the normal operation and safe use of the device.
