DC Jack Power Connectors from China
1 resources tagged with "Dc Jack"
A DC jack is the receptacle half of a barrel power connector — the panel- or PCB-mounted socket that accepts the matching DC plug on devices, adapters, and instruments. The diameter pairing is the trap: a 5.5/2.1mm jack and a 5.5/2.5mm jack look identical but won't mate reliably with the wrong plug. Beyond the pin diameter you choose between PCB through-hole, SMD, and panel-mount styles, plus whether the jack needs a built-in switching contact to detect plug insertion.
When you source DC jacks, match the inner-pin diameter to your plug exactly, confirm the current rating, and decide if you need the normally-closed switch contact (common in battery/adapter auto-switching designs). The common pitfall is under-rated solder tabs that overheat at your real load, so load-test samples at the full design current.
Wiki (1)
FAQ
What size DC jack do I need?
Match it to your plug — the common pairings are 5.5/2.1mm and 5.5/2.5mm, which are not interchangeable. Confirm both the outer and inner diameter against the mating plug before ordering.
What does the switched contact on a DC jack do?
A switching DC jack has an internal contact that opens when a plug is inserted, letting a device automatically cut over from battery to external power. Specify it if your design relies on auto-switching; omit it for simple power-in.
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