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meerkt
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USB C-to-A cables for specific phone models?!

Thu May 25, 2017 11:05 am

Some sellers apparently sell USB type C cables for specific phone models.

Any idea what's the deal here?

There's the whole potential-for-over-current blunder in C-to-legacy cables (a combimation of the USB-IF lacking foresight + device manufacturers that don't protect ports properly), but I don't see how the type-C device matters here.
 
Arvald
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Re: USB C-to-A cables for specific phone models?!

Thu May 25, 2017 11:10 am

Current the cable can handle.
I saw a 2A and a 3A on the links you gave.

Some phones require the higher current for either faster charge or just charging at all.
 
meerkt
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Re: USB C-to-A cables for specific phone models?!

Thu May 25, 2017 11:20 am

I don't think that's the thing.

In some of these listing the price is the same for all cable types. Best business strategy: only use 3A cables.
In other listings there's more than two prices (just a few cents off anyway), which suggests maybe more than two cable types.
In yet another listing "2A" is stated in the title, so they don't claim 3A to begin with.
 
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Re: USB C-to-A cables for specific phone models?!

Thu May 25, 2017 11:46 am

meerkt wrote:
Some sellers apparently sell USB type C cables for specific phone models.

Any idea what's the deal here?

The seller has an auction template with a dropdown menu for situations like cases or screen protectors. They re-used it here in a backwards way to filter out buyers who may not have a USB-C device. It's odd, but it probably does stop some lazy people who otherwise click the BUY button based on title and pictures without reading the product description (and then want a return because "the seller sent me the wrong item").
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Vhalidictes
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Re: USB C-to-A cables for specific phone models?!

Thu May 25, 2017 12:07 pm

Arvald wrote:
Current the cable can handle.
I saw a 2A and a 3A on the links you gave.

Some phones require the higher current for either faster charge or just charging at all.


Can you explain, Arvald? IIRC a 3 Amp USB-A cable would be useless because A ports can't output 3 Amps. I thought that USB 3.0 standards only go up to two Amps?
 
Arvald
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Re: USB C-to-A cables for specific phone models?!

Thu May 25, 2017 12:24 pm

USB 3.1 is up to 5A
 
Topinio
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Re: USB C-to-A cables for specific phone models?!

Thu May 25, 2017 12:27 pm

USB BC is up to 1.8 A and USB PD is up to 5.0, I think.
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EndlessWaves
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Re: USB C-to-A cables for specific phone models?!

Thu May 25, 2017 12:37 pm

Vhalidictes wrote:
Arvald wrote:
Current the cable can handle.
I saw a 2A and a 3A on the links you gave.

Some phones require the higher current for either faster charge or just charging at all.


Can you explain, Arvald? IIRC a 3 Amp USB-A cable would be useless because A ports can't output 3 Amps. I thought that USB 3.0 standards only go up to two Amps?


USB 3.0 only goes up to 900mA. The higher output is part of add-on standards like USB Power Delivery or USB Type-C. IIRC the power delivery spec (up to 100W) was originally designed independently of the Type C connector.

I would imagine the drop downs are simply to increase visibility and attract sellers who search for a cable for their specific device rather than just for the generic cable.

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