[glennfle]

I just read through the USB-C spec, and the closest thing it says to 20V/3A minimum is in a chart that has a footnote:

"the USB Type-C specification requires that a Source port that supports USB BC 1.2 be at a minimum capable of supplying 1.5 A and advertise USB Type-C Current @ 1.5 A in addition to supporting the USB BC 1.2 power provider termination."

Is there a more explicitly states a minimum of 20V/3A? I may be misreading the table above this (Table 2-1).

https://www.usb.org/sites/default/files/USB%20Type-C%20Spec%...

[glennfle]

Nope, finally found it in the USB-C spec, section 4.6.2, covering cables: "USB Power Delivery in Standard Power Range (SPR) operation is intended to work over un- modified USB Type-C to USB Type-C cables, therefore any USB Type-C cable assembly that incorporates electrical components or electronics shall ensure that it tolerate, or be protected from, a VBUS voltage of 21 V."

This comes after a table that would seem to indicate USB-C as a whole supports a minimum of 7.5W, but then this cable-specific section expands that. However, it notes that it must tolerate or be protected from, which in this context I gather means "must pass power through."