These include USB 3 Type-B, USB Type-C, and USB 3 Micro-B. Of course, USB 2.0 peripherals could draw power from the host port and function without an external power supply.
USB 3.0 includes something called the Powered B (or Powered USB) connector.
The USB connectors also operate over -25 to 85°C and have Ro HS compliance.
One reason USB 3.0 is becoming widely used is its capability for handling power.
The USB 2.0 specification in 2000 provided a third transfer rate of 480 Mbps.
The USB 3.0 standard released a few years ago moved data rates up to 450 MB/sec while retaining backward compatibility with USB 2.0.But until obsolescence comes, designers must be able to differentiate one USB style from another.First a few basics about connection speed: USB connections in the 1990s provided two speeds, 12 and 1.5 Mbps.One reason is that the pin assignments are symmetrical, a fact that becomes evident by examining the pin assignments on a type C connector.Of course, the most visible difference between USB 2.0 and 3.0 is in the cable and connectors.This power handling ability has led to the use of USB 3.0 connections in several new schemes.For example, one called Quick Charge is expected to make heavy use of USB Type C connectors.USB 3.1 also provides backward compatibility with USB 2.0 by means of a dual-bus architecture: One bus is a USB 2.0 bus while the other is an Enhanced Super Speed bus.The USB 3.1 spec uses the term Enhanced Super Speed as a generic adjective referring to any valid collection of USB features that were defined for the bus that runs in parallel to the USB 2.0 bus in a USB 3.1 system.The 3.0 spec boosted handling power because USB 2.0’s limit of 500 m A at 5 V had become problematic for charging small electronics.Now USB 3.0 can provide 900 m A at 5V while USB 3.1 delivers more when paired with a Type-C cable, capable of delivering 5 A at 20 V.