Check with the manufacturer before using an A-A cable for data transfer. Shop USB-A. USB-B Info. USB-B Images. The B-style connector is designed for use on USB peripheral devices. The B-style interface is squarish in shape, and has slightly beveled corners on the top ends of the connector.
Like the A connector, it uses the friction of the connector body to stay in place. The B-socket is an "upstream" connector that is only used on peripheral devices. Shop USB-B. USB-C Info. USB-C Images. It can be plugged into any USB-C device using either end. It has been tested with up to 10, connection styles and is 6 times more durable than USB-A.
Shop USB-C. The connection can be easily identified by its white-colored receptacle and compact 5 pin design. The connection can be easily identified by its black-colored receptacle and compact 5 pin design. One drawback to the B-style connector is its size, which measures almost a half inch on each side. This made the B-style interface unsuitable for many compact personal electronic devices. As a result, many device manufacturers began the miniaturization of USB connectors with this Mini-b.
By default, a Mini-b cable is presumed to have 5 pins. This connector is quite small, about two-thirds the width of an A-style connector. Shop Mini-B 5-Pin. It resembles the shape of a standard B-style connector, with beveled corners; however, it is much smaller in size. Shop Mini-B 4-Pin. Known as "SuperSpeed", this A-style connector is commonly found on host controllers in computers and hubs, the A-style connector is a flat, rectangular interface.
However, the USB 3. The USB 3. USB devices have some choice of implemented modes, and USB version is not a reliable statement of implemented modes. Modes are identified by their names and icons, and the specification suggests that plugs and receptacles be colour-coded SuperSpeed is identified by blue.
Unlike other data buses such as Ethernet , USB connections are directed; a host device has "downstream" facing ports that connect to the "upstream" facing ports of devices. Only downstream facing ports provide power; this topology was chosen to easily prevent electrical overloads and damaged equipment. Each format has a plug and receptacle defined for each of the A and B ends. A USB cable, by definition, has a plug on each end—one A or C and one B or C —and the corresponding receptacle is usually on a computer or electronic device.
The mini and micro formats may connect to an AB receptacle, which accepts either an A or a B plug, that plug determining the behavior of the receptacle. The connectors the USB committee specifies support a number of USB's underlying goals, and reflect lessons learned from the many connectors the computer industry has used.
The connector mounted on the host or device is called the receptacle , and the connector attached to the cable is called the plug. By design, it is difficult to insert a USB plug into its receptacle incorrectly. The USB specification requires that the cable plug and receptacle be marked so the user can recognize the proper orientation.
USB cables and small USB devices are held in place by the gripping force from the receptacle, with no screws, clips, or thumb-turns as other connectors use. The different A and B plugs prevent accidentally connecting two power sources.
There are so-called cables with A plugs on both ends, which may be valid if the "cable" includes, for example, a USB host-to-host transfer device with two ports. The standard connectors were designed to be more robust than many past connectors.
This is because USB is hot-swappable , and the connectors would be used more frequently, and perhaps with less care, than previous connectors. Standard USB has a minimum rated lifetime of 1, cycles of insertion and removal,  the mini-USB receptacle increases this to 5, cycles,  and the newer Micro-USB  and USB-C receptacles are both designed for a minimum rated lifetime of 10, cycles of insertion and removal.
This change was made so that the connector on the less expensive cable would bear the most wear. In standard USB, the electrical contacts in a USB connector are protected by an adjacent plastic tongue, and the entire connecting assembly is usually protected by an enclosing metal shell.
The shell on the plug makes contact with the receptacle before any of the internal pins. The shell is typically grounded, to dissipate static electricity and to shield the wires within the connector. The USB standard specifies tolerances for compliant USB connectors to minimize physical incompatibilities in connectors from different vendors.
The USB specification also defines limits to the size of a connecting device in the area around its plug, so that adjacent ports are not blocked. Compliant devices must either fit within the size restrictions or support a compliant extension cable that does. USB 2. USB 3. USB ports and connectors are often color-coded to distinguish their different functions and USB versions. USB connector types multiplied as the specification progressed. The connectors were different so that users could not connect one computer receptacle to another.
The data pins in the standard plugs are recessed compared to the power pins so that the device can power up before establishing a data connection. Some devices operate in different modes depending on whether the data connection is made.
Charging docks supply power and do not include a host device or data pins, allowing any capable USB device to charge or operate from a standard USB cable. Charging cables provide power connections, but not data. In a charge-only cable, the data wires are shorted at the device end, otherwise, the device may reject the charger as unsuitable. The maximum allowed cross-section of the overmold boot which is part of the connector used for its handling is 16 by 8 mm 0.
Both Mini-A and Mini-B plugs are approximately 3 by 7 mm 0. The Micro-A connector is 6. The thinner Micro-USB connectors were intended to replace the Mini connectors in devices manufactured since May , including smartphones , personal digital assistants , and cameras. The Micro plug design is rated for at least 10, connect-disconnect cycles, which is more than the Mini plug design.
The 3. To achieve USB 3. The USB 3. In this way, cables with smaller 5 pin USB 2. USB cables exist with various combinations of plugs on each end of the cable, as displayed below in the USB cables matrix. The Micro-AB receptacle is capable of accepting both Micro-A and Micro-B plugs, attached to any of the legal cables and adapters as defined in revision 1. To enable Type-AB receptacles to distinguish which end of a cable is plugged in, plugs have an "ID" pin in addition to the four contacts in standard-size USB connectors.
Typically, a pull-up resistor in the device is used to detect the presence or absence of an ID connection. The OTG device with the A-plug inserted is called the A-device and is responsible for powering the USB interface when required, and by default assumes the role of host. The OTG device with the B-plug inserted is called the B-device and by default assumes the role of peripheral. An OTG device with no plug inserted defaults to acting as a B-device.
If an application on the B-device requires the role of host, then the Host Negotiation Protocol HNP is used to temporarily transfer the host role to the B-device. Developed at roughly the same time as the USB 3. The pin double-sided connector provides four power—ground pairs, two differential pairs for USB 2.
Adapters and cables with a USB-C receptacle are not allowed. Full-featured USB-C 3. USB-C devices also support power currents of 1. Manufacturers of personal electronic devices might not include a USB standard connector on their product for technical or marketing reasons. Full functionality of proprietary ports and cables with USB standard ports is not assured; for example, some devices only use the USB connection for battery charging and do not implement any data transfer functions.
SuperSpeed uses separate transmit and receive differential pairs , which additionally require shielding typically, shielded twisted pair but twinax is also mentioned by the specification. Thus, to support SuperSpeed data transmission, cables contain twice as many wires and are thus larger in diameter.
The USB 1. The primary reason for this limit is the maximum allowed round-trip delay of about 1. When adding USB device response time, delays from the maximum number of hubs added to the delays from connecting cables, the maximum acceptable delay per cable amounts to 26 ns. There are several minimum allowable voltages defined at different locations within a chain of connectors, hubs, and cables between an upstream host providing the power and a downstream device consuming the power.
To allow for voltage drops, the voltage at the host port, hub port, and device are specified to be at least 4. Unlike USB 2. The limit to device power draw is stated in terms of a unit load which is mA for USB 2. Low-power devices may draw at most 1 unit load, and all devices must act as low-power devices before they are configured.
A high-powered device must be configured, after which it may draw up to 5 unit loads mA , or 6 unit loads mA for SuperSpeed devices, as specified in its configuration because the maximum power may not always be available from the upstream port. A bus-powered hub is a high-power device providing low-power ports. It draws 1 unit load for the hub controller and 1 unit load for each of at most 4 ports.
The hub may also have some non-removable functions in place of ports. A self-powered hub is a device that provides high-power ports by supplementing the power supply from the host with its own external supply. Optionally, the hub controller may draw power for its operation as a low-power device, but all high-power ports must draw from the hub's self-power.
Where devices for example, high-speed disk drives require more power than a high-power device can draw,  they function erratically, if at all, from bus power of a single port. USB provides for these devices as being self-powered. However, such devices may come with a Y-shaped cable that has two USB plugs one for power and data, the other for only power , so as to draw power as two devices.
Dedicated charging ports can be found on USB power adapters to run attached devices and battery packs. Charging ports on a host with both kinds will be labelled. Per the base specification, any device attached to a standard downstream port SDP must initially be a low-power device, with high-power mode contingent on later USB configuration by the host.
Charging ports, however, can immediately supply between 0. The charging port must not apply current limiting below 0. Since these currents are larger than in the original standard, the extra voltage drop in the cable reduces noise margins, causing problems with High Speed signaling.
Battery Charging Specification 1. Revision 1. It made several changes, and increased limits including allowing 1. Also, support was removed for charging port detection via resistive mechanisms. Before the Battery Charging Specification was defined, there was no standardized way for the portable device to inquire how much current was available.
Accessory charging adapters ACA are devices that provide portable charging power to an On-The-Go connection between host and peripheral. ACAs have three ports: the OTG port for the portable device, which is required to have a Micro-A plug on a captive cable; the accessory port, which is required to have a Micro-AB or type-A receptacle; and the charging port, which is required to have a Micro-B receptacle, or type-A plug or charger on a captive cable.
The accessory port acts as any other port. When appropriately signaled by the ACA, the portable device can charge from the bus power as if there were a charging port present; any OTG signals over bus power are instead passed to the portable device via the ID signal. Bus power is also provided to the accessory port from the charging port transparently. Devices can request higher currents and supply voltages from compliant hosts—up to 2 A at 5 V for a power consumption of up to 10 W , and optionally up to 3 A or 5 A at either 12 V 36 W or 60 W or 20 V 60 W or W.
The intent is to permit uniformly charging laptops, tablets, USB-powered disks and similarly higher-power consumer electronics, as a natural extension of existing European and Chinese mobile telephone charging standards. This may also affect the way electric power used for small devices is transmitted and used in both residential and public buildings.
The first Power Delivery specification defined six fixed power profiles for the power sources. PD-aware devices implement a flexible power management scheme by interfacing with the power source through a bidirectional data channel and requesting a certain level of electrical power, variable up to 5 A and 20 V depending on supported profile. Instead of six fixed profiles, power supplies may support any maximum source output power from 0.
Revision 3. As of April , [update] there are silicon controllers available from several sources such as Texas Instruments and Cypress Semiconductor. Prior to Power Delivery, mobile phone vendors used custom protocols to exceed the 7. For example, Qualcomm's Quick Charge 2. Sleep-and-charge USB ports can be used to charge electronic devices even when the computer that hosts the ports is switched off. Normally, when a computer is powered off the USB ports are powered down.
This feature has also been implemented on some laptop docking stations allowing device charging even when no laptop is present. As of 14 June [update] , all new mobile phones applying for a licence in China are required to use a USB port as a power port for battery charging. When a device doesn't recognize the faster-charging standard, generally the device and the charger fall back to the USB battery-charging standard of 5 V at 1.
When a device detects it is plugged into a charger with a compatible faster-charging standard, the device pulls more current or the device tells the charger to increase the voltage or both to increase power the details vary between standards. Such standards include: .
Some USB devices require more power than is permitted by the specifications for a single port. This is common for external hard and optical disc drives , and generally for devices with motors or lamps. Such devices can use an external power supply , which is allowed by the standard, or use a dual-input USB cable, one input of which is for power and data transfer, the other solely for power, which makes the device a non-standard USB device.
Some USB ports and external hubs can, in practice, supply more power to USB devices than required by the specification but a standard-compliant device may not depend on this. In addition to limiting the total average power used by the device, the USB specification limits the inrush current i. Otherwise, connecting a device could cause problems with the host's internal power. USB devices are also required to automatically enter ultra low-power suspend mode when the USB host is suspended.
Some non-standard USB devices use the 5 V power supply without participating in a proper USB network, which negotiates power draw with the host interface. These are usually called USB decorations. In most cases, these items contain no digital circuitry, and thus are not standard-compliant USB devices. This may cause problems with some computers, such as drawing too much current and damaging circuitry.
Prior to the USB Battery Charging Specification, the USB specification required that devices connect in a low-power mode mA maximum and communicate their current requirements to the host, which then permits the device to switch into high-power mode. Some devices, when plugged into charging ports, draw even more power 10 watts at 2.
It is commonly used in point of sale systems to power peripherals such as barcode readers , credit card terminals , and printers. The Micro-USB interface is commonly found on chargers for mobile phones. Y-shaped USB 3.
USB-powered mini fans. From Wikipedia, the free encyclopedia. Communication connector using the USB protocol. This article is about the physical and electrical aspects of USB connectors. For the standard in general, see USB. Micro-B plug 8-pin Mini-B plug, a proprietary connector used on many older Japanese cameras for both USB and analog AV output This strongly resembles the 8-pin Micro-B plug which often has only 5 pin positions occupied.
See also: USB 3. Main article: USB-C. Main article: Common external power supply. Main article: PoweredUSB. A small device that provides voltage and current readouts for devices charged over USB. This USB power meter additionally provides a charge readout in mAh and data logging. USB-powered vacuum cleaner. Archived from the original on 30 December Retrieved 28 April Archived from the original PDF on 12 April Retrieved 28 April — via www.
Archived from the original on 21 April Retrieved 2 December August Archived from the original PDF on 11 June Archived from the original on 18 March Retrieved 24 April Stack exchange. Archived from the original on 7 December Retrieved 3 December Archived from the original on 17 June
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USB A Male to USB Mini-B 5PIN Male. Description This USB cable enables you to connect different devices e.g. HDD enclosure, digital cameras, mobile phones. - It features two USB Type A connectors: one for data and power, and one for power only. - The cable terminates in a mini B connector for connecting to the. USB Mini-B (Fuji®). This is another unofficial connector also widely used on digital cameras especially certain models manufactured by Fuji®. It more closely.