Adafruit
2.1mm 5VDC Barrel Jack to USB C Adapter
$11.70
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A simple adapter that converts a standard 2.1 mm DC barrel jack into a USB-C plug, letting you power USB-C devices from common 5 V barrel-jack wall adapters....
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A simple adapter that converts a standard 2.1 mm DC barrel jack into a USB-C plug, letting you power USB-C devices from common 5 V barrel-jack wall adapters. Plug it onto the end of your existing power supply and connect straight to a Raspberry Pi 4 or any USB-C device that runs on 5 V without USB Power Delivery negotiation.
Key Features
- 2.1 mm Barrel Jack Socket – Accepts standard centre-positive 5 V DC plugs
- USB-C Plug Output – Reversible connector, no orientation to worry about
- Compact & Passive – No active electronics; straight-through power connection
Warning: This adapter has no protection circuit and does not perform USB Power Delivery negotiation. Use only with a 5 V centre-positive barrel jack supply. Incorrect polarity or voltage may damage your connected device.
Ideal For
- Powering a Raspberry Pi 4 from an existing 5 V barrel-jack supply
- Repurposing 2.1 mm wall adapters for USB-C devices
- Bench setups where barrel-jack supplies are already in use
Package Contents
- 1× 2.1 mm Barrel Jack to USB-C Adapter
Jargon buster
Plain-language definitions for the technical terms used above.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- DC barrel jack
- A round power connector commonly used for low-voltage DC power supplies, often described by its outer and inner diameters such as 5.5 x 2.1 mm. Matching the barrel size and polarity is important so the plug physically fits and powers the device correctly.
- USB Power Delivery
- USB Power Delivery (USB-PD) is a standard that lets devices negotiate higher power levels over a USB-C connection. It allows a device to draw or supply more power than basic USB provides, which matters for modules and peripherals with higher power demands.
- USB-C
- USB-C is a small, reversible USB connector that can carry power, data and, on some devices, video over a single cable. The same connector can range from charging only to high-speed data, so the functions a given port actually supports vary.
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