Today, the latest physical standard is Type C and besides greater bandwidth and being both bi-directional and reversible, this newest iteration is capable of significantly higher power transfer than previous generations. USB A to Type C Charger Nylon Braided Cable Apphone Usb type c Connector
The USB-C connector has a flatter and smaller male port. The hole in the middle of the port where the small connector pins will fit into is a small and flat oval hole. The difference between USB-A and USB C male ports is that USB-A connectors are much larger than USB-C.
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When it comes to USB connectors, there are three different associated standards: the physical connector, data transmission protocol, and power delivery. CUI Devices has an in-depth blog describing these standards here. From a high level, a USB Type C connector follows the physical connector standard. This physical standard is designed to meet the power delivery standard up to 100 W, which opens up USB to a new realm of power opportunities.
As previously stated, the quantity of electricity a cable can transport determines how quickly it charges. This is proportional to the size of the wire within the cable; it’s just physics. Because a wire’s current carrying capacity is limited, a larger wire can carry more current.
A typical USB cable’s wires are usually standard-sized 28 gauge wires; however fast charging cables include bigger/thicker 24 gauge wires, allowing more current to be given to a battery of the same capacity. The conversion of high-power devices (100 W – 240 W) to USB-C charging requires not only compliant devices and chargers. It also needs specialized cables. Currently, regular USB-C cables can support up to 60 W at 20 V and 3 A. Anything over 60 W and up to 100 W requires a 5 A-rated cable that includes a built-in chip to allow detection of how much current it can safely handle.
Most of today’s fast charging technologies can charge a mobile phone to 50% of the power in half an hour. USB-C is definitely a major step in the right direction, with more and more companies adopting the technology, it will only mean slimmer devices with fewer ports, more flexibility, better rate of transferring data and an even better sound quality.