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USB Power Delivery (USB PD) is a USB-IF specification that lets compatible devices negotiate how much power to send over a USB connection. It can support different power levels and even change the direction of power flow. The actual power depends on what the device, charger, and cable all support; a USB-C connector alone does not guarantee USB PD or a particular wattage.
What does USB Power Delivery mean?
USB PD is a power-delivery protocol: compatible equipment communicates to negotiate power over a USB connection. It is designed to provide flexible power alongside data over one cable, from low-power devices to higher-power applications. USB Implementers Forum (USB-IF) describes it this way: “The USB Power Delivery (USB PD) Specification enables the maximum functionality of USB by providing more flexible power delivery along with data over a single cable.”
USB PD does not mean that every connected device receives the charger’s maximum output. The source and the device receiving power negotiate a level they can support, and the cable must also be suitable for that power.
Is USB PD the same as USB-C?
No. USB PD is the power-delivery specification; USB Type-C is the connector and cable system. They are related, but the shape of a USB-C port or plug does not establish that a product supports USB PD or any particular power level. Check the specifications for the device, charger, and cable rather than relying on the connector alone. USB-IF’s USB Charger (USB Power Delivery) overview describes the power negotiation and cable requirements.
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How much power can USB PD deliver?
USB-IF’s overview of USB PD Revision 3.1 says the specification expanded the earlier 100 W limit to as much as 240 W over a full-featured USB Type-C cable and connector. The overview associates the newer fixed voltage levels with these maximum power figures:
| Fixed voltage level | Maximum power described by USB-IF |
|---|---|
| 28 V | Up to 140 W |
| 36 V | Up to 180 W |
| 48 V | Up to 240 W |
USB PD also includes an adjustable-voltage supply mode, which lets a device request an intermediate voltage up to the maximum fixed voltage offered by the charger. These are specification capabilities, not a promise that every USB-C charger, cable, or device can deliver 240 W. The connection is limited by the capabilities of its components.
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Can power flow in either direction?
Yes. USB-IF says either the host or peripheral may provide power under USB PD, so power is not necessarily one-way from a wall charger to a device. Depending on the products and setup, a wall-powered monitor could charge a laptop while displaying its picture; a laptop or charger could pass power through a laptop’s USB ports; or a battery-powered device could temporarily provide power to another device. These are possible configurations, not features guaranteed by every product.
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How to check whether a USB PD setup will work
Before connecting equipment for charging or pass-through power, compare the supported capabilities of each part of the setup:
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- Device: Check the power levels and charging profiles it accepts.
- Charger or other power source: Check its output capability and the profiles it offers.
- Cable: Confirm that its power rating suits the intended level, particularly for high-power charging.
- Ports and power direction: Check whether each port can act as a source, a sink (the device receiving power), or both for the intended setup.
USB-IF’s overview also explains that USB PD is designed to coexist with USB Battery Charging implementations. Implementers adding battery-charging capability or supporting host adapters such as docks or ACA devices should consult the relevant USB Battery Charging Specification as well.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which USB PD specification version is current?
USB-IF’s document library lists USB Power Delivery Specification Revision 3.2 Version 1.2, dated September 14, 2026. That listing is newer than the USB-IF overview’s description of Revision 3.1 and its 240 W capability; the 240 W figure above is specifically attributed to that Revision 3.1 overview. USB-IF also lists a USB PD Compliance Test Specification for Q3 2026, dated May 31, 2026. A listed specification or test document does not, by itself, establish that a particular retail product is certified. See the USB-IF document library.
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- No PPS support: Charging for Samsung / Google Pixel phones is limited at 9V max. and will NOT achieve Super Fast Charging speeds.
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