PortaPow USB Power Blocker - Stops Charging, Allows Data (Single Pack)

Does exactly what it says is does. Prevents 5v power from reaching the device. Really only needed when dealing with self-powered devices that don't implement USB properly, which either try to backpower the host, or partially start only the 5v components. In the past I'd carve up a cable, and cut the 5v line, or modify the target device itself, and this is a bit easier of a solution. Things work well at 12Mbps (USB 1 "Full" speed). I have not tested with any 2.x devices, though the traces are pretty short, I would expect no issues. (All of my easily available 2.x devices are bus-powered, and they won't work for obvious reasons).

Just what I needed to prevent my device from powering a host device I needed to access. Data continued to be available from my device. Good price.

Works perfectly for my wireless Carplay adapter. The car supplies power to the USB/data port even if the car is off so my phone would connect/stay connected to the adapter anytime I was near it. This dongle lets the data through and I use a USB splitter to get the power from the lighter socket which is not powered when the car is off. Kind of workaround but it works.

I recently started using the PortaPow USB Power Blocker with my micro USB cable for my 3D printer, and I have to say, it's been a game-changer! This little gadget does an excellent job of preventing my printer from pulling too much power from my sonic pad, which could potentially damage it. It stops charging while still allowing data transfer, ensuring that my devices stay safe and sound. Installation was a breeze - I simply plugged it in between my printer and the sonic pad, and it started working right away. Plus, it's super compact, so it doesn't take up much space. Overall, I'm incredibly impressed with the PortaPow USB Power Blocker. It's a simple yet effective solution that gives me peace of mind knowing that my devices are protected. Five stars from me!

This product works as intended for blocking power on the usb, but did not work with the products I had wanted to use it with. But I was impressed with the how sturdy the build quality of this is. I own a Schiit Modius and Bifrost (gen 3 usb), both devices are recognized via usb with this device, but would not output anything. Both devices had independent power of the computers usb. The problem I wanted to solve is either EMI noise or a usb ground loop from a high power gaming computer. When either dac is connected via usb, they pick up a lot of electrical noise when the computer is in high power states. The noise comes through on the Modius even if on a different input, the computer usb has to be completely disconnected (seperate usb power via wall wart and optical from the computer are crystal clear). Unfortunately, the same noise is coming through to the DACs with the power blocked via this device... So the usb is dirty on just the data pins. I have ordered a slightly more expensive usb isolator and filter to try...

Bought this so my OctoPrint running on a Raspberry Pi doesn't power my 3D printer. I wanted to be able to flip the power switch and shut it down. Impossible without this blocker. Good quality and value.

Does exactly what it is supposed to do and block the +DC power on the USB port but allow data transfer to work. I have this installed on a USB port on a Raspberry Pi5 that uses USB for a serial connection to another device. I didnt want to power this other device with my RPi5. but wanted to use minicom to communicate to it. Works as advertised.

I bought these to use CarPlay without constantly charging my phone battery. They didn't work. My car refused to acknowledge my phone was plugged in using this adapter. Waste of money.