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So does that mean that normal USB A connector for some reason can't handle the current? That seems odd.
by baddox 11y ago
So does that mean that normal USB A connector for some reason can't handle the current? That seems odd.
- sbierwagen 11y agoYes, in fact. USB1 tops out at 2.1A, USB3 here is 3A. (Watts is volts times amps. 15W/5V = 3A) USB Power Delivery chargers can deliver quite a lot more.
- baddox 11y agoI'm only talking about the physical connector.
- sbierwagen 11y agoWell if you go by the spec then USB1 and USB2 can only deliver 0.5A. Apple seems to have settled as 2.1A as the most current you can run through a USB connector without getting it too hot.
- Dylan16807 11y agoThe power delivery spec requires special cables but allows 5 amps over normal* type A connectors. *except for a detection mechanism for higher-power cables
- tjohns 11y agoNot sure about the connector, but I have heard reports that some cheaper USB cables with thinner-gauge wires already cannot handle the current from some chargers that are on the market. I can imagine USB-C only makes this more of a concern, since the USB Power Delivery spec allows up to 5 A @ 20 V.