USB Voltage Protector Circuit diagram - Simple Electronic Project





Diagram of USB 5V Hight and low volt protection circuit


Components Needed for this Project:

You can get the components from any of the sites below:

  1. TL431 Voltage Regulator [See Buy Click Amazon]
  2. IRFZ44N MOSFET [See Buy Click Amazon]
  3. 1k Ohm Resistor [See Buy Click Amazon]
  4. 1.2K Ohm Resistor [See Buy Click Amazon]
  5. 1.5k Ohm Resistor [See Buy Click Amazon]

*Please note: These are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

Related Basic Electronic Mini Project Circuit Diagram:


Working Principle




Frequently asked questions

What is the voltage protection of a USB port?

The voltage is clamped to a level below that which could cause damage to the circuit diagram. Over-current events that occur on the USB power supply line can be dealt with effectively by the polymer-based PTC (Positive Temperature Coefficient) device.

Are all USB ports 5 volts?

All ports start at 5v but can be negotiated up to the limit output. USB type C supports 100w or 20v at 5 amps, and the next standard is 48v with a max of 5 amps output.

USB Overvoltage and ESD protection

top left is GND, below is VBUS, and +5V is protected output. How would I deal with ESD protection for the 5V line output? Using a USBLC6 would protect the following circuit from ESD, but would also just clamp the voltage down, if it is, for some reason, too high.

USB Type-C Circuit Protection

Universal Serial Bus (USB) Type-C has introduced a compact, reversible data and power supply connector that also supports USB Power Delivery (USB). Supporting up to 100 watts (20 volts @ 5 amps), USB is helping to drive a rapid gain in popularity for USB Type-C as it can, among other features, quickly charge Li-ion batteries 3.7V.

USB Working Explanation

The USB port provides DC bias of the power supply, which is regulated by a Zener diode used. We can acquire varied levels of controlled DC voltage by using different voltage Zener diodes. When using a USB power supply.

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