Comment by adrian_b
7 hours ago
While USB Type C can be broken much more easily by brute force and it is more prone to accidental disconnects than Type A, the Type C connectors are guaranteed to survive much more cycles of plugging/unplugging than Type A connectors.
Type A connectors are typically guaranteed only for around 1000 cycles, with some better connectors rated up to 1500 cycles and some worse connectors rated only for a few hundred cycles.
If you have a device with a Type A connector that you plug and unplug at least once per day, there is a non-negligible risk that the connector will become defective before other components of the device.
On the other hand Type C connectors are guaranteed for at least ten thousand mating cycles, with the best guaranteed for at least twenty thousand cycles, so you should not be able to wear them out through normal usage.
It is true however that you must handle Type C connectors much more delicately than Type A, otherwise you can break them before they are worn out by mating cycles.
During the last few years, high-endurance Type A connectors have also appeared, which can survive a limit between 5 thousand and 20 thousand mating cycles, matching Type C connectors, but most equipment with Type A connectors does not use such more expensive connectors.
Thanks for the details on mating cycles – although I've never had a TypeA connector "fail" from mating cycles (and have some in daily use for decades). I've only used USB-C for about a year, but have already broken one (which completely disables the plug, unlike the indescructible TypeA).
>It is true however that you must handle Type C connectors much more delicately than Type A, otherwise you can break them before they are worn out by mating cycles.
I would suspect that on a large enough datasample, TypeA connectors will out-survive TypeC (durability-wise), for your above reasoning alone. Have you ever worked hardware techsupport in an academic environment (or have children, or wives, or husbands)?
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As an electrician with tons of realworld experience resolving burned-up installations, I also doubt the 240W across top-end USB-C connectors is safe (I know theoretically it is... just like all those burnt-up outlets I've replaced in the real world). If I breath on my main display's USB-C connector (<1 year old!), it often re-sync's (a few seconds of annoyance).
Obviously USB-A could never approach these power ratings, but I suspect USB-C cannot either (in realworld == electric fires). I love & use PoE (via Cat5e/6): it has much lesser-rated ampacity (despite higher cross-sectional area of wire).