![]() This design offers strong resistance to unplugging when used properly. Typically, this feature is a conical cut-back section of the tip, just behind the insulator that separates the inner from outer contact surfaces.Ī "lock-ring DC coaxial connector" uses a captive threaded ring or collar to secure the connection between the plug and jack. ![]() These 3.5 mm OD plugs are normally used for lower voltages and currents.Ī ring-shaped "locking detent" or "high-retention feature", present on the barrel of some DC coaxial connectors, is a feature intended to prevent accidental disconnection. Generic plugs are often described by their inside diameter, such as 2.1 mm DC plugs and 2.5 mm DC ( direct current) plugs.Īfter the two common 5.5 mm OD (Outer Diameter) plugs, the next-most common size is 3.5 mm OD with a 1.3 mm ID (Inner Diameter), usually about 9.5 mm in length, although both longer and shorter versions also exist. Use of the wrong power supply may cause severe equipment damage or even fire.Ĭommon sizes and interchangeability Some common DC power connectors ![]() Alternatively, connectors of the same size can be part of power supplies with different voltages and currents. Two connectors from different manufacturers with different sizes could potentially be attached to power supplies with the same voltage and current. The sizes and shapes of connectors do not consistently correspond to the same power specifications across manufacturers and models. One possible reason that a particular manufacturer may use a new size is to discourage use of third-party power supplies, either for technical reasons or to force use of their own accessories, or both. It is quite possible that new sizes will continue to appear and disappear. The smaller types usually have lower current and voltage ratings. Voltage is often unspecified, but may be up to 48 V with 12 V typical. See the table at the end of this article.Ĭontact ratings commonly vary from unspecified up to 5 A (11 A for special high-power versions). There are many different sizes of coaxial power connectors. There is typically a single spring-loaded contact at the side of the socket and a pin in the center. The outer terminal is usually GND pin and inner is V n+ is a voltage suppply pin, where n voltage is 5V, 12V, 24V etc. The inner and outer barrels are separated by an insulating layer, which is flared at the tip to prevent a short circuit when the plug is inserted or removed. The second, inside contact is a hollow metallic cylinder constructed to accept insertion of the pin in the corresponding socket. On the plug, the outer body terminal is metallic and cylindrical in shape, and comprises one of the two contacts. Cables for such cases are available with a plug at each end, although cables or adapters with two receptacles are not widely available. As the use of a plug implies a cable, even a short stub, some power supplies carry panel-mounted receptacles instead to avoid this cable. Cables are available with one in-line receptacle fanning out to a number of plugs, so that many devices may be supplied by one supply. Power is generally supplied by a plug to a receptacle. Some in-line receptacles are also cable-mounted. ![]() Receptacles may be panel-mounted or circuit board-mounted. The connector pairs for barrel connectors are defined in terms of "plugs" and "receptacles" receptacles are more commonly called "sockets" or "jacks" in the United States. Some of these jacks contain a normally closed switch the switch can disconnect internal batteries whenever the external power supply is connected.Ĭonnector construction and terminology Also known as barrel connectors, concentric barrel connectors or tip connectors, these small cylindrical connectors come in an enormous variety of sizes.īarrel plug connectors are commonly used to interface the secondary side of a power supply with the device. Common DC power connectorsĪ coaxial power connector is an electrical power connector used for attaching extra-low voltage devices such as consumer electronics to external electricity. Note: connectors depicted do not connect with each other. Connector gender is determined by the center contact. ( Learn how and when to remove this template message)Ī common coaxial power connector, male (left) and female (right), 5.5 × 2.5 mm. ( November 2011) ( Learn how and when to remove this template message) Statements consisting only of original research should be removed. Please improve it by verifying the claims made and adding inline citations. This article possibly contains original research.
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