Pin diameter is contingent upon sleeve diameter a 5.5mm sleeve will have either a 2.5mm or 2.1mm pin.

Sleeve diameter is most commonly either 5.5mm or 3.5mm. When ordering, there are three differentiating characteristics of a barrel connection- inner diameter (the diameter of the pin inside the jack), outer diameter (the diameter of the sleeve on the outside of the plug), and polarity (whether the sleeve voltage is higher or lower than the tip voltage). Make sure to check out the product image and specs to find what you are looking for!īarrel connectors provide only two connections, frequently referred to as 'pin' or 'tip' and 'sleeve'. Depending on where your get these connectors, the jack can be referred to 'male' barrel connector due to the pin in the center and vice versa for the plug. Heads up! There are varying opinions on the gender of the jack and plug for these low power coax connectors. Some of these connectors will have an additional contact that allows the application to detect whether a power supply is plugged into the barrel jack or not, thus allowing the device to bypass batteries and save battery life when running on external power.

The female barrel connector, or 'jack', can be purchased in several varieties: PCB mounted (surface mount or through hole), cable mount, or panel mount. Wall adaptors are widely available, in a variety of power ratings and voltages, making barrel connectors a common means for connecting power to small projects. Barrel Connectorsīarrel connectors are typically found on low-cost consumer electronics which can be plugged into wall power via bulky AC wall adaptors. These vary widely by application and size, but we will only focus on some of the most common ones here. While many connectors carry power in addition to data, some connectors are used specifically to provide power connections to devices.

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Identify molex connector