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Small black adapter with 5.5mm barrel jack and USB-A female port

JacobsParts Inc.

JacobsParts Inc. UB2DC-A Barrel Jack to USB Type A Female Connector 5.5mm/2.1mm

SKU CH-64C9-WT992

Converts a 5.5 x 2.1 mm centre-positive barrel jack into a USB-A female port for powering Raspberry Pi boards, HDMI dongles and other USB devices that do not require data-line resistance

  • TypeConverter
  • Connector TypeUSB A to DC Plug
  • Power USB devices from a 5.5mm barrel supply
  • 1mm centre-positive jack fits common 5V adapters
  • USB Type A female port accepts standard cables
  • No data-line resistors — incompatible with iPhone or iPad charging
  • Works with Raspberry Pi, HDMI dongles and most USB-powered gear

What this adapter does

The JacobsParts UB2DC-A converts a 5.5mm/2.1mm centre-positive barrel jack into a USB Type A female port. It lets you run USB-powered gear from an existing 5 V barrel-type power supply. The connector pair is the only function; there is no voltage conversion or regulation on board.

Who it suits and who it does not

Makers powering a Raspberry Pi, an HDMI streaming stick or similar USB devices from a spare barrel charger will find it works well. Buyers who need to charge an iPhone, iPad or other device that requires D+/D- line resistance cannot use this adapter. It also does not suit anyone needing data transfer or a different barrel size.

What to verify before ordering

Confirm that your power supply delivers exactly 5 V and uses a 5.5 mm outer / 2.1 mm inner centre-positive plug. Check that the target device draws power only and does not rely on data-line signalling for charging negotiation. Ensure the barrel jack on your supply matches the adapter’s female socket polarity.

Highlights

  • Power USB devices from a 5.5mm barrel supply
  • 1mm centre-positive jack fits common 5V adapters
  • USB Type A female port accepts standard cables
  • No data-line resistors — incompatible with iPhone or iPad charging
  • Works with Raspberry Pi, HDMI dongles and most USB-powered gear

Specifications

BrandJacobsParts
ModelUB2DC-A
TypeConverter
Connector TypeUSB A to DC Plug

Questions about this item

What barrel-jack power supply do I already need to use this 5.5 mm/2.1 mm connector?

You need a 5 V supply with a 5.5 mm/2.1 mm male barrel plug, centre positive, that can deliver the current your USB device requires.

Will this adapter charge an older iPhone or iPad that I still use?

No, because the adapter leaves the D+/D- lines without the resistance those devices expect, so they will not recognise it as a charger.

How can I confirm the adapter is passing power correctly after I plug it in?

Connect a USB device such as a Raspberry Pi or HDMI dongle; if it powers up and runs normally, the adapter is working as intended.

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