DC
DC - DC Connector Barrel Jack | AG Electronica
The AG Electronica DC-005 is a 2.1 mm through-hole DC power connector barrel jack widely used as a low-cost, panel-mountable power inlet on consumer electronics, hobbyist boards, and embedded modules. It accepts a 2.1 x 5.5 mm barrel plug and supports up to 24 VDC at 3 A continuous current with a typical contact resistance under 30 mOhm.
A DC barrel connector is a standardized coaxial power inlet that mates with a male DC plug carrying center-positive or center-negative polarity. The DC-005 follows the EIA/JEDEC-conventional 2.1 mm inner pin / 5.5 mm outer sleeve geometry, the de-facto pinout used by legacy wall adapters. This category includes through-hole, surface-mount, mid-mount and panel-mount variants, locking and non-locking versions, and a range of pin diameters (1.3, 1.65, 2.1, 2.5 mm). Each variant is keyed by inner diameter so that power adapters cannot accidentally cross-mate between incompatible voltage rails - the industry standard remains 2.1 x 5.5 mm for 12-24 V adapters and 2.5 x 5.5 mm for higher-current laptop supplies.
The DC-005 exposes three through-hole pins: a tip contact (the spring-loaded sleeve), a sleeve contact (the inner pin), and a mechanical mounting pin tied to chassis ground. Its current rating is derived from the silver-plated copper alloy contact system and a 5,000-cycle mating durability rating, sufficient for the typical 3-5 year service life of a wall-powered consumer product.
In circuit terms, this part is a passive mechanical-electrical interconnect - it has no active silicon, no SOA, and no logic. Its signal integrity is characterized solely by contact resistance and insertion force. Engineers select it for its sub-100-cent cost, its compatibility with universal AC adapters, and its ability to be wave-soldered alongside through-hole components on small-batch production lines.
Typical applications include Arduino/Raspberry Pi power input, 3D-printer 24 V supplies, audio amplifier 12-24 V rails, CCTV camera feeds, and IoT gateway mains adapters. The 24 V / 3 A rating comfortably drives 60-70 W of downstream load through the connector before derating.
When designing with this connector, reserve at least 10 mm of PCB keep-out around the barrel opening to allow plug insertion clearance, and add a TVS diode across the input to clamp inductive adapter transients at the connector pins.
This page synthesizes the AG Electronica DC-005 datasheet specification with cross-references to the broader DC-005 family and competitive offerings, plus practical PCB-layout notes not found in the manufacturer datasheet alone.
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