USB Power Specification

ModeUSB 2.0USB 3.x
Current MaxVbus toleranceCurrent MaxVbus tolerance
Low-power bus powered100mA4.40V - 5.25V150mA4.00V - 5.25V
High-power bus powered100mA4.40V - 5.25V150mA4.00V - 5.25V
500mA4.75V - 5.25V900mA4.00V - 5.25V
Self-powered100mA150mA
Suspend500uA2.5mA

USB 3.1 Type-C connector supports higher power devices (5V @ 1.5A, 3A).

Decoupling capacitance between VBUS and ground on devices:
- Maximum is 10uF to limit inrush current.
- Minimum is 1uF to limit flyback voltage on disconnection.

USB Power Delivery Specification

ProfileSupplying capabilityMax Power
0reserved-
15V @ 2A10 W
25V @ 2A, 12V @ 1.5A18 W
35V @ 2A, 12V @ 3A36 W
45V @ 2A, 12V, 20V @ 3A60 W
55V @ 2A, 12V, 20V @ 5A100 W


USB Speed Specification

Mode/NameData RateTolerance
Low speed1.5Mb/s (192KB/s)±1.5% or 15,000ppm
Full speed12Mb/s (1.5MB/s)±0.25% or 2,500ppm
High speed (USB 2.0)480Mb/s (60MB/s)± 500ppm
USB 5Gbps, SuperSpeed 5Gbps (USB 3.0, USB 3.1 Gen1, USB 3.2 Gen1x1)5Gb/s (0.5GB/s)± 600ppm
USB 10Gbps, SuperSpeedPlus, SuperSpeed 10Gbps (USB 3.2 Gen1x2)10Gb/s (1.0GB/s)
USB 10Gbps, SuperSpeedPlus, SuperSpeed 10Gbps (USB 3.1 Gen2, USB 3.2 Gen2x1)10Gb/s (1.2GB/s)
USB 20Gbps, SuperSpeed 20Gbps (USB 3.2 Gen2x2)20Gb/s (2.4GB/s)
USB 40Gbps (USB 4.0 v1)40Gb/s
USB 80Gbps (USB 4.0 v2)80Gb/s

USB 2.0 Cable Specification

Data wire size:
 Shielded → 28 AWG twisted,
 Non-shielded → 28 AWG non-twisted
Power wire size:
AWGMax length
280.81 m
261.31 m
242.08 m
223.33 m
205.00 m