USB A to DC 5521 Male Power Cable

Overview

A dc 5521 male power cable converts a USB-A 5 V source into a standard 5.5 x 2.1 mm coaxial barrel plug. It is the most frequently requested power tap in this category, because 5521 is the default barrel on a huge installed base of small DC equipment and USB-A sources are everywhere. The electrical question is never whether the plug fits – it is whether the host can supply the current and whether the drop along the lead leaves enough voltage at the device.

Key Specifications

Start from what the host will advertise

The port sets the ceiling. These are the values defined by the USB specifications for the common host types – they are not a rating we assign to this cable.

Two caveats. A multi-port charger marked 3 A usually shares that across its outlets, so each port delivers less. And a device that draws in pulses – a motor, a printer head, a radio on transmit – trips the port on the peak, not on the average. Measure with a meter that captures the peak, or add margin.

Then do the drop arithmetic

At 5 V you have very little room. A device specified for 5 V +/- 5% has 0.25 V of margin, and that margin has to cover the host port, both connectors and the conductor. The wire gage sets the resistance per meter, and the drop is current times resistance over the length you actually run – doubled, because the return path is in the same cable.

1. Take the load current at the device, including startup.
2. Take the one-way length of the run, then double it.
3. Multiply by the resistance per meter for the gage you intend to use.
4. Add the contact resistance at both connectors.
5. Compare the total against the margin your device allows.

If the number does not fit, the fix is a heavier conductor or a shorter run – not a bigger charger. Where the existing documentation does not state a current figure, the value is stated per your drawing; we do not assign one.

Fitment: 5521 and its near neighbors

The 5521 and 5525 pair deserves the warning. Because the shells are the same diameter, a mismatch will often assemble and then fail intermittently under vibration or heat – which presents as a random reboot rather than as a bad connection. Read the rating label, and if it is not legible, measure the jack center pin.

Typical applications for this dc 5521 male power cable

• Powering 5 V loads – small fans, LED controllers, sensor boards – from a power bank
• Bench and prototype builds that need a barrel input from a USB charger
• Field kits where one power bank feeds several 5521 devices
• Single-board computer and microcontroller projects with a barrel jack
• Temporary installations where running mains is not practical

How to specify your build

1. Load current, steady and peak.
2. Run length, measured along the real route.
3. Conductor gage, or let us size it from the two above.
4. Polarity – center positive unless stated otherwise.
5. Jacket color and material, plus any print.
6. Straight or right-angle barrel.
7. Quantity.

Workmanship and testing

Build standard for USB A builds is IPC/WHMA-A-620 Class 3 under ISO 9001, with terminations from 32 to 12 AWG. No USB unit is packed until continuity and pinout check out, and seal checking is quoted whenever an ingress rating is on the drawing.

Every production run can ship with RoHS and REACH declarations and the electrical report agreed at quotation; see certifications and material declarations. UL styles and other named approvals are built to drawing: we source to the style you specify and document it, rather than asserting a listing we do not hold. This assembly is built on the four lines covered under cable assembly and wire harness production, with nothing in the build handed to an undisclosed subcontractor. Related reading: what outdoor duty does to a jacket. Tooling is quoted separately, cut in-house rather than brokered out, and owned by you.

Custom builds and ordering

On USB A builds, prototype lots run from 1 to 50 pcs and leave in 3 working days. Production runs of 500 pcs and up ship 14 working days after approval. Tooling not already held adds around 10 working days. USB builds go out under your part number and labeling, and material certificates and first-article reports are on offer.

Related DC plug power cables

• USB A to DC 5521 Female Adapter Cable
• USB A Coiled to DC 5521 Female Cable
• USB-C PD Trigger Cable to DC 5.5×2.1mm
• USB-C PD Trigger Power Cable to DC 5.5×2.1mm Barrel
• DC 5521 Power Splitter, 1 Female 2 Way
• COB LED Power Injection Cable, DC 5.5×2.1mm
• Mini UPS Splitter Cable DC 5.5×2.1mm

Full range: DC plug power cable assemblies.

Frequently Asked Questions