DC Barrel Connector connector, generated image
AI-generated image. A generic connector, not a specific brand or product.
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Size5.5 × 2.1 mm
SignalLow-voltage DC

DC Jack

DC Barrel Connector
Invented in
1970s
Invented by
Generic industry standard
Availability
Very common

The small cylindrical plug on countless power adapters, routers, pedals, laptops, LED strips. An outer sleeve and inner pin carry low-voltage DC.

Technical specifications
Introduced1970s
SignalLow-voltage DC
Common5.5 × 2.1 mm
PolarityUsually centre-positive
Found on
a routera wall socket
Recommended brands
01Goobay
02DeLOCK
03BKL Electronic
Where to buy
Amazonamazon.itReicheltreichelt.de
Europe-focused retailer searches. Some links are affiliate links and may earn a commission.
Fun fact

Its many near-identical sizes (5.5×2.1, 5.5×2.5, 3.5×1.35…) are the bane of every gadget owner hunting for the right charger.

Tips & tricks

Match voltage AND polarity (centre-positive ⊕ is usual), reversed polarity can fry the device.

Philosophy

A connector defined by its frustrating variety. So nearly standard, yet never quite the same twice.

Applications
Power
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