What the standard defines
The USB Type-C specification defines the reversible connector, the cable and how devices detect each other. The USB Power Delivery specification defines how a device and a supply negotiate voltage and current above basic USB levels. Data speeds are defined by the separate USB data specifications a port supports.
What it does not promise
No power level from the connector alone: a USB-C socket may accept only basic USB power or negotiate much more. No data capability: some USB-C ports carry power only. No compatibility with every charger: a tool needing a particular Power Delivery profile heats or runs slowly on a supply that cannot provide it. No cable adequacy: cables are rated separately.
What it works with
The power requirement a maker publishes — voltage, current or wattage — and the supply it names. On boards, the logic voltage and on-board regulator, which decide what the USB supply feeds.
Questions makers ask before buying
Why does a USB-C soldering iron heat slowly on some chargers?
Because the charger may not offer the voltage and power the iron requests through Power Delivery. The iron’s maker publishes the supply it needs for full power.
Is every USB-C cable the same?
No. Cables differ in the current they are rated for and the data speeds they support, and higher-power use needs a cable rated for it.
Last reviewed 15 September 2026