Assuming constant voltage (5V) and that cable is irrelevant (it will be thick enough), which USB connector would have lower temperature rise, big old plain brick of USB A 1.1 or new but small USB C?

I want it to handle no more than 3 amps, but I want it to have as little temperature rise a possible. Just because of its massive dimensions I lean in favor of USB-A 1.1 but I see "USB-C power delivery" hyped everywhere and I wonder maybe USB-A 1.1 has some flaw other than its size that USB-C solves.

  • \$\begingroup\$ You can get USB-C cables rated for 5A, while the old USB charging spec for type A maxed out around 2A I believe. \$\endgroup\$ Jan 10, 2022 at 13:53
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    \$\begingroup\$ If you check a few USB-A connector's contact current rating, you'll see that it's not more that 2 Amps. Regarding the temp rise, you can never guarantee a low temp rise in either socket but In a few USB wall-type chargers with type-A connector that I designed, at full load (i.e. 2.1A) the connectors' temperature was around 40-50°C which is enough to feel by touching. \$\endgroup\$ Jan 10, 2022 at 16:13


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