Some power jack models include a third conductor which forms a switch with the outer sleeve conductor. Convention is for the center pin to be power and the outer sleeve to be ground, but reversing the connections is acceptable. The standard dc barrel plug or jack has two conductors, one each for power and ground. When the connectors are mated, that additional depth needs to be accounted for in the plug barrel length. Second, in some installations, the depth of the chassis wall must be considered. First, the plug barrel may not be required to be completely enclosed by the receiving jack when the connectors are mated and thus a longer plug barrel length than the jack insertion depth is acceptable. Jack insertion depth dimensions may often be less than the plug barrel lengths which can be explained for two reasons. The typical mating connection to the outer sleeve is a cantilevered flat spring and thus the clearance between the outer sleeve and the mating connector is not critical to the proper functioning of the connector.Ī third dimension specified on dc power connectors is the depth of insertion. The diameter of the inner sleeve (which interfaces with the inner pin) should be slightly larger than that of the mating pin, but manufacturers have not standardized upon a common clearance. Typical dc power connector inner pin and outer sleeve diameters Common diameters of the inner pin and outer sleeve are shown in the table below: Understanding Barrel Connector DimensionsĪ common standard for defining barrel connectors is the diameter of the inner pin and outer sleeve. Users should be aware that there are standardized jack and plug combinations in which the center pin is in the jack for some and in the plug for others. The connector with the center pin is accepted as male and the mating connector is accepted as female. Some in the industry avoid declaring male and female when discussing connectors, while many engineers, following the conventions of the RF connector industry, have accepted the center pin configuration for defining the gender of barrel power connectors. The definitions of gender for dc power connectors are less standardized than the definitions of jacks, plugs and receptacles. A receptacle is also mounted on a power cord and receives power from a mating plug. The plug is most often located on the electrical cord and supplies power from the power supply. The jack typically receives power and is mounted in the appliance, either on a PCB or in the chassis. While there is not an absolute standard for the definition of barrel power connectors, the electronics industry has drifted towards common usage of the terms jack, plug and receptacle. Jacks, Plugs, and Receptacles in Dc Power Applications Additionally, there should be little concern that sensitive components will be damaged by plugging a power connector into an incorrect receptacle since barrel connectors are almost exclusively used to supply power to electronic devices. A benefit of the recessed second conductor is that it is difficult to accidentally create a short between the two conductors. Both the jack and the plug of barrel connectors feature one exposed conductor and a second recessed conductor. These ratings ensure reliability when using these connectors in power delivery applications. Low voltage dc power connectors, often referred to as barrel connectors, have both current and voltage ratings specified by the manufacturer. Selecting one of the more commonly used models is often the best choice for power supply connections as these connectors are inexpensive and readily available. Specifying the proper dc power connector is not a complex task and can be completed quickly and painlessly. You have finished the initial phases of your new design and are anxious to see the project through to completion, but a few tasks remain, including the selection of the low voltage dc input power connector.
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