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SuperSpeed USB logo Type Production history Designed November 2008 Manufacturer USB 3.0 Promoter Group (,,,,, and ) Superseded Superseded by (September 2017) General specifications Width 12 mm (A plug), 8 mm (B plug), 12.2 mm (Micro-A & Micro-B plugs) Height 4.5 mm (A plug), 10.44 mm (B plug), 1.8 mm (Micro-A & Micro-B plugs) Pins 9 Electrical Max. Current 900 mA Data Data signal Yes Bitrate 5 Gbit/s (625 MB/s) USB 3.0 is the third major version of the (USB) standard for interfacing computers and electronic devices.

Among other improvements, USB 3.0 adds the new transfer rate referred to as SuperSpeed USB (SS) that can transfer data at up to 5 Gbit/s (625 MB/s), which is about ten times as fast as the standard. Manufacturers are recommended to distinguish USB 3.0 connectors from their USB 2.0 counterparts by blue color-coding of the Standard-A receptacles and plugs, and by the initials SS., released in July 2013, is the successor standard that replaces the USB 3.0 standard. USB 3.1 preserves the existing SuperSpeed USB transfer rate, now giving the USB 3.0 label the new label called USB 3.1 Gen 1, while defining a new transfer rate called SuperSpeed USB 10 Gbps, also called USB 3.1 Gen 2 (which is basically the actual USB 3.1 but without the USB 3.1 Gen 1 or USB 3.1 Gen 2 label), which can transfer data at up to 10 Gbit/s (1.25 GB/s, twice the rate of USB 3.0), bringing its theoretical maximum speed on par with the first version of the., released in September 2017, is the successor standard that replaces the USB 3.1 standard. Contents • • • • • • • • • • • • • • • • • • • Overview [ ] The specification of USB 3.0 is similar to that of, but with many improvements and an alternative implementation. Earlier USB concepts such as endpoints and the four transfer types (bulk, control, and interrupt) are preserved but the protocol and electrical interface are different. The specification defines a physically separate channel to carry USB 3.0 traffic.

Front view of a Standard-A USB 3.0 connector, showing its front row of four pins for the USB 1.x/2.0 backward compatibility, and a second row of five pins for the new USB 3.0 connectivity. The plastic insert is in the USB 3.0 standard blue color known as Pantone 300C. In USB 3.0, dual-bus architecture is used to allow both USB 2.0 (Full Speed, Low Speed, or High Speed) and USB 3.0 (SuperSpeed) operations to take place simultaneously, thus providing. Connections are such that they also permit, that is, running USB 3.0 devices on USB 2.0 ports. The structural topology is the same, consisting of a tiered star topology with a root hub at level 0 and hubs at lower levels to provide bus connectivity to devices. Data transfer and synchronization [ ] The SuperSpeed transaction is initiated by the host making a request followed by a response from the device. The device either accepts the request or rejects it; if accepted, the device sends data or accepts data from the host.

If the endpoint is halted, the device shall respond with a STALL handshake. If there is lack of buffer space or data, it responds with a Not Ready (NRDY) signal to tell the host that it is not able to process the request. When the device is ready, it will send an Endpoint Ready (ERDY) to the host which will then reschedule the transaction. The use of and the limited amount of packets, combined with asynchronous notifications, enables links that are not actively passing packets to be put into reduced power states, which allows better power management. Data encoding [ ] The 'SuperSpeed' bus provides for a transfer mode at a nominal rate of 5.0 Gbit/s, in addition to the three existing transfer modes. Accounting for the encoding overhead, the raw data throughput is 4 Gbit/s, and the specification considers it reasonable to achieve 3.2 Gbit/s (0.4 GB/s or 400 MB/s) or more in practice.

All data is sent as a stream of eight-bit (one-byte) segments that are scrambled and converted into 10-bit symbols via; this helps the receiver to decode correctly even in the presence of (EMI). Scrambling is implemented using a free-running (LFSR). The LFSR is reset whenever a COM symbol is sent or received. Unlike previous standards, the USB 3.0 standard does not directly specify a maximum cable length, requiring only that all cables meet an electrical specification: for copper cabling with 26 wires, the maximum practical length is 1.3 meters (4.3 ft). Power and charging [ ] As with earlier versions of USB, USB 3.0 provides power at 5 volts nominal. The available current for low-power (one unit load) SuperSpeed devices is 150 mA, an increase from the 100 mA defined in USB 2.0. For high-power SuperSpeed devices, the limit is six unit loads or 900 mA (4.5 watts), almost twice USB 2.0's 500 mA.: section 9.2.5.1 Power Budgeting USB 3.0 ports may also implement other USB specifications for increased power, including the for up to 1.5 A or 7.5 watts, or the for up to 100 watts.

Availability [ ]. A USB 3.0 four-port hub, using a chipset The USB 3.0 Promoter Group announced on 17 November 2008 that the specification of version 3.0 had been completed and had made the transition to the (USB-IF), the managing body of USB specifications.

This move effectively opened the specification to hardware developers for implementation in future products. The first USB 3.0 consumer products were announced and shipped by in November 2009, while the first certified USB 3.0 consumer products were announced on 5 January 2010, at the Las Vegas (CES), including two motherboards by and.

Manufacturers of USB 3.0 host controllers include, but are not limited to,,,, Etron,,, and. Hasee Laptop Wifi Drivers Download there. As of November 2010, Renesas and Fresco Logic have passed USB-IF certification. Motherboards for 's processors have been seen with Asmedia and Etron host controllers as well. On 28 October 2010, released the 17 3D featuring a Renesas USB 3.0 host controller several months before some of their competitors. Worked with Renesas to add its USB 3.0 implementation into its chipsets for its 2011 platforms.

[ ] At CES2011, unveiled a laptop called ' X500' that included USB 3.0 and, and released a new series of laptops that would include USB 3.0. As of April 2011, the and series were available with USB 3.0 ports, and, as of May 2012, the laptop series were as well; yet the USB root hosts failed to work at SuperSpeed under Windows 8. On 11 June 2012, announced new and with USB 3.0.

Adding to existing equipment [ ]. Side connectors on a laptop computer. Left to right: USB 3.0 host,, connector, USB 2.0 host. Note the additional pins on the top side of the USB 3.0 port. In laptop computers that lack USB 3.0 ports but have an slot, USB 3.0 ports can be added by using an ExpressCard-to-USB 3.0 adapter. Although the ExpressCard port itself is powered from a 3.3 V line, the connector also has a USB 2.0 port available to it (some express cards actually use the USB 2.0 interface rather than the true express card port). However, this USB 2.0 port is only capable of supplying the power for one USB 3.0 port.

Where multiple ports are provided on the express card, additional power will need to be provided. Additional power for multiple ports on a laptop PC may be derived in the following ways: • Some ExpressCard-to-USB 3.0 adapters may connect by a cable to an additional USB 2.0 port on the computer, which supplies additional power. • The ExpressCard may have a socket for an external power supply. • If the external device has an appropriate connector, it can be powered by an.

• USB 3.0 port provided by an ExpressCard-to-USB 3.0 adapter may be connected to a separately-powered USB 3.0 hub, with external devices connected to that USB 3.0 hub. On the motherboards of desktop PCs which have (PCIe) slots (or the older standard), USB 3.0 support can be added as a PCI Express. In addition to an empty PCIe slot on the motherboard, many 'PCI Express to USB 3.0' expansion cards must be connected to a power supply such as a adapter or external power supply, in order to power many USB 3.0 devices such as mobile phones, or external hard drives that have no power source other than USB; as of 2011, this is often used to supply two to four USB 3.0 ports with the full 0.9 A (4.5 W) of power that each USB 3.0 port is capable of (while also transmitting data), whereas the PCI Express slot itself cannot supply the required amount of power. If faster connections to storage devices are the reason to consider USB 3.0, an alternative is to use, possibly by adding an inexpensive expansion slot bracket that provides an eSATAp port; some external hard disk drives provide both USB (2.0 or 3.0) and eSATAp interfaces. To ensure compatibility between motherboards and peripherals, all USB-certified devices must be approved by the (USB-IF). At least one complete end-to-end test system for USB 3.0 designers is available on the market. Adoption [ ] The USB Promoter Group announced the release of USB 3.0 on November 2008.

On 5 January 2010, USB-IF announced the first two certified USB 3.0 motherboards, one by Asus and one by Gigabyte. Previous announcements included Gigabyte's October 2009 list of seven USB 3.0 motherboards, and an ASUS motherboard that was cancelled before production.

Commercial controllers were expected to enter into volume production in the first quarter of 2010. On 14 September 2009, announced a USB 3.0 external hard drive.

On 4 January 2010, announced a small portable HDD bundled with an additional USB 3.0, targeted for laptops (or desktops with ExpressCard slot addition) at the CES in Las Vegas Nevada. The contains support for USB 3.0 since version 2.6.31, which was released in September 2009. Supports USB 3.0 since version 8.2, which was released in February 2011. Was the first Microsoft operating system to offer built in support for USB 3.0. In support was not included with the initial release of the operating system. However, drivers that enable support for Windows 7 are available through websites of hardware manufacturers. Released its first with integrated USB 3.0 ports in 2012 with the release of the chipset.

Some industry analysts have claimed that Intel was slow to integrate USB 3.0 into the chipset, thus slowing mainstream adoption. These delays may be due to problems in the manufacturing process, a focus to advance the platform, a wait to mature all the 3.0 connections standards (USB 3.0,, ) before developing a new chipset, or a tactic by Intel to favor its new interface. Announced laptops with USB 3.0 ports on 11 June 2012, nearly four years after USB 3.0 was finalized.

Began supporting USB 3.0 with its in 2011. Announced support of USB 3.0 with its -based platform intended for handheld devices. Issues [ ] Speed and compatibility [ ] Various early USB 3.0 implementations widely used the / µD72020x family of host controllers, which are known to require a firmware update to function properly with some devices. A factor affecting the speed of USB storage devices (more evident with USB 3.0 devices, but also noticeable with USB 2.0 ones) is that the (BOT) protocol drivers are generally slower than the protocol (UAS[P]) drivers. On some old (2009–2010) -based motherboards, the built-in USB 3.0 chipsets are connected by default via a 2.5 lane of the, which then did not provide full PCI Express 2.0 speed (5 GT/s), so it did not provide enough bandwidth even for a single USB 3.0 port. Early versions of such boards (e.g. The P55A-UD4 or P55A-UD6) have a manual switch (in BIOS) that can connect the USB 3.0 chip to the processor (instead of the PCH), which did provide full-speed PCI Express 2.0 connectivity even then, but this meant using fewer PCI Express 2.0 lanes for the graphics card.

However, newer boards (e.g. Gigabyte P55A-UD7 or the Asus P7P55D-E Premium) used a technique (in the case of those boards provided by a PEX8608 or PEX8613 PCI Express switch) that combines two PCI Express 2.5 GT/s lanes into a single PCI Express 5 GT/s lane (among other features), thus obtaining the necessary bandwidth from the PCH.

Radio frequency interference [ ] USB 3.0 devices and cables may with wireless devices operating in the 2.4 GHz ISM band. This may result in a drop in throughput or complete loss of response with and devices. Various strategies can be applied to resolve the problem, ranging from simple solutions such as increasing the distance of USB 3.0 devices from Wi-Fi routers and Bluetooth devices, to applying additional shielding around internal computer components. There were some devices (for example Vivo Xplay 3S) which were promised to come with USB 3.0, however ultimately didn't ship with USB 3.0, because of manufacturer's inability to resolve the electromagnetic interference caused by the USB 3.0.

Connectors [ ]. USB 3.0 Standard-A receptacle (top, in the blue color ' 300C'), Standard-B plug (middle), and Micro-B plug (bottom) A USB 3.0 Standard-A receptacle accepts either a USB 3.0 Standard-A plug or a USB 2.0 Standard-A plug. Conversely, it is possible to plug a USB 3.0 Standard-A plug into a USB 2.0 Standard-A receptacle. This is a principle of backward compatibility. The Standard-A is used for connecting to a computer port, at the host side.

A USB 3.0 Standard-B receptacle accepts either a USB 3.0 Standard-B plug or a USB 2.0 Standard-B plug. Backward compatibility applies to connecting a USB 2.0 Standard-B plug into a USB 3.0 Standard-B receptacle. However, it is not possible to plug a USB 3.0 Standard-B plug into a USB 2.0 Standard-B receptacle, due to a physically larger connector. The Standard-B is used at the device side.

Since USB 2.0 and USB 3.0 ports may coexist on the same machine and they look similar, the USB 3.0 specification recommends that the Standard-A USB 3.0 receptacle have a blue insert ( 300C color). The same color-coding applies to the USB 3.0 Standard-A plug.: sections 3.1.1.1 and 5.3.1.3 USB 3.0 also introduced a new Micro-B cable plug, which consists of a standard USB 1.x/2.0 Micro-B cable plug, with an additional 5-pin plug 'stacked' inside it. That way, the USB 3.0 Micro-B host connector preserved its backward compatibility with the USB 1.x/2.0 Micro-B cable plugs.

However, it is not possible to plug a USB 3.0 Micro-B plug into a USB 2.0 Micro-B receptacle, due to a physically larger connector. USB 3.0 Standard-A plug (top) and receptacle (bottom), with annotated pins The connector has the same physical configuration as its predecessor but with five more pins. The VBUS, D−, D+, and GND pins are required for USB 2.0 communication.

The additional USB 3.0 pins are two differential pairs and one ground (GND_DRAIN). The two additional differential pairs are for SuperSpeed data transfer; they are used for full duplex SuperSpeed signaling. The GND_DRAIN pin is for drain wire termination and to control EMI and maintain signal integrity.

USB 3.0 connector pinouts Pin Color Signal name Description A connector B connector Shell N/A Shield Metal housing 1 Red VBUS Power 2 White D− USB 2.0 differential pair 3 Green D+ 4 Black GND Ground for power return 5 Blue StdA_SSRX− StdB_SSTX− SuperSpeed transmitter differential pair 6 Yellow StdA_SSRX+ StdB_SSTX+ 7 N/A GND_DRAIN Ground for signal return 8 Purple StdA_SSTX− StdB_SSRX− SuperSpeed receiver differential pair 9 Orange StdA_SSTX+ StdB_SSRX+ The USB 3.0 Powered-B connector has two additional pins for power and ground supplied to the device. 10 N/A DPWR Power provided to device (Powered-B only) 11 DGND Ground for DPWR return (Powered-B only) Backward compatibility [ ].

USB Micro-B USB 2.0 vs USB Micro-B SuperSpeed (USB 3.0) USB 3.0 and USB 2.0 (or earlier) Type-A plugs and receptacles are designed to interoperate. USB 3.0 Type-B receptacles, such as those found on peripheral devices, are larger than in USB 2.0 (or earlier versions), and accept both the larger USB 3.0 Type-B plug and the smaller USB 2.0 (or earlier) Type-B plug. USB 3.0 Type B plugs are larger than USB 2.0 (or earlier) Type-B plugs; therefore, USB 3.0 Type-B plugs cannot be inserted into USB 2.0 (or earlier) Type-B receptacles. Micro USB 3.0 (Micro-B) plug and receptacle are intended primarily for small portable devices such as smartphones, digital cameras and GPS devices. The Micro USB 3.0 receptacle is backward compatible with the Micro USB 2.0 plug. A receptacle for, which is an eSATA/USB combo, is designed to accept USB Type-A plugs from USB 2.0 (or earlier), so it also accepts USB 3.0 Type-A plugs.

USB 3.1 [ ] A January 2013 press release from the USB group revealed plans to update USB 3.0 to 10 Gbit/s (1250 MB/s). The group ended up creating a new USB specification, USB 3.1, which was released on 31 July 2013, replacing the USB 3.0 standard. The USB 3.1 specification takes over the existing USB 3.0's SuperSpeed USB transfer rate, also referred to as USB 3.1 Gen 1, and introduces a faster transfer rate called SuperSpeed USB 10 Gbps, referred to as USB 3.1 Gen 2, putting it on par with a single first-generation channel.

The new mode's logo features a caption stylized as SUPERSPEED+. The USB 3.1 Gen 2 standard increases the maximum to 10 Gbit/s (1250 MB/s), double that of SuperSpeed USB, and reduces line encoding overhead to just 3% by changing the to.

The first USB 3.1 Gen 2 implementation demonstrated real-world transfer speeds of 7.2 Gbit/s. The USB 3.1 standard is backward compatible with USB 3.0 and USB 2.0. It defines the following transfer modes: • USB 3.1 Gen 1 - SuperSpeed, 5 Gbit/s (625 MB/s) data signaling rate over 1 lane using 8b/10b encoding, the same as USB 3.0. • USB 3.1 Gen 2 - SuperSpeed+, new 10 Gbit/s (1250 MB/s) data rate over 1 lane using 128b/132b encoding. USB 3.2 [ ] On 25 July 2017, a press release from the USB 3.0 Promoter Group detailed a pending update to the USB Type-C specification, defining the doubling of bandwidth for existing USB-C cables. Under the USB 3.2 specification, existing SuperSpeed certified USB-C 3.1 Gen 1 cables will be able to operate at 10 Gbit/s (up from 5 Gbit/s), and SuperSpeed+ certified USB-C 3.1 Gen 2 cables will be able to operate at 20 Gbit/s (up from 10 Gbit/s). The increase in bandwidth is a result of multi-lane operation over existing wires that were intended for flip-flop capabilities of the Type-C connector.

The USB 3.2 standard is backward compatible with USB 3.1/3.0 and USB 2.0. It defines the following transfer modes: • USB 3.2 Gen 1x1 - SuperSpeed, 5 Gbit/s (625 MB/s) data signaling rate over 1 lane using 8b/10b encoding, the same as USB 3.1 Gen 1 and USB 3.0.

• USB 3.2 Gen 2x1 - SuperSpeed+, 10 Gbit/s (1250 MB/s) data rate over 1 lane using 128b/132b encoding, the same as USB 3.1 Gen 2. • USB 3.2 Gen 1x2 - SuperSpeed, new 10 Gbit/s (1250 MB/s) data rate over 2 lanes using 8b/10b encoding.

• USB 3.2 Gen 2x2 - SuperSpeed+, new 20 Gbit/s (2500 MB/s) data rate over 2 lanes using 128b/132b encoding. See also [ ].