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Comments on What is the popular 12 V DC jack connector?

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What is the popular 12 V DC jack connector?

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I'm designing a PCB for a project. 12 volt input power supply is provided externally, so the user will buy a power adapter, so putting a popular DC jack on the PCB is the best choice.

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posted over 3 years ago
3y ago by Peter Mortensen‭
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vigneshtnj‭
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General comments (1 comment)
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One common 12 V DC power connector is the "2.1 mm plug": 2.1mm inner diameter, 5.5mm outer diameter. Jameco says it is one of the most common DC power connector.

Several Sparkfun power connectors are 2.1 mm plug compatible.

Several Adafruit power connectors are 2.1 mm plug compatible.

Many devices, including some GoTo telescope mounts, many CCTV cameras, the power socket on Arduino boards, etc. are 2.1 mm plug compatible. (Like most devices powered with barrel connectors, they require Tip Positive, and a range of voltages that includes 12 VDC).

posted about 3 years ago
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DavidCary‭
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pros: - many replacement power supplies - makes ground connection first cons: - doesn't s... (1 comment)
pros: - many replacement power supplies - makes ground connection first cons: - doesn't s...
Pete W‭ wrote about 3 years ago · edited about 3 years ago
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pros:

  • many replacement power supplies;
  • makes ground connection first

cons:

  • doesn't stop other voltages with the same plug;

  • doesn't stop confusingly similar plugs, namely the almost indistinguishable 2.5x5.5mm plug. Will feel about the same going in for the user, but unreliable intermittent contact, if any, due to the smaller center pin in the 2.1 jack vs the 2.5 plug;

Mechanical insertion force happens after contact has been made. Depending on circuit's inrush behavior vs power supply's output / limiting behavior, can result in hundreds of ms of repeated arcing when hot plugged (another failure mode to hunt down...)