USB Power Specification

ModeUSB 2.0USB 3.x
Curent MaxVbus toleranceCurent 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).
USB Power Delivery is configurable up to 20 V and 5 A.

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 @ 2.0A2 W
25V @ 2.0A, 12V @ 1.5A.18 W
35V @ 2.0A, 12V @ 3A.36 W
45V @ 2.0A, 12V and 20V at 3A60 W
55V @ 2.0A, 12V and 20V at 5A100 W


USB Speed Specification

ModeData 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 (USB2.0)480Mb/s (60MB/s)± 500ppm
Super Speed (USB3.0)4.8Gb/s (600MB/s)± 600ppm
Enhanced Super Speed (USB 3.1)10Gb/s (1.25GB/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