# item.guide
Side-by-Side Comparison USB

USB-C vs. USB4

Comparing 2 standards across 9 specifications. 9 key differences identified.

Comparing:
USB-C
USB4

USB-C is the reversible, oval 24-pin connector now used across USB 2.0 through USB4 and Thunderbolt. It's the only connector required for USB4, and under EU law it became mandatory on most new phones, tablets, and cameras sold in the EU by the end of 2024, with laptops following by April 2026.

View full USB-C spec sheet →

USB4, released August 2019, is built on Intel's Thunderbolt 3 protocol, donated to USB-IF as the new foundation -- up to 40 Gbit/s, a mandatory USB-C connector, and tunneling that lets a single port carry USB, DisplayPort, and PCIe traffic at once. Thunderbolt 3 compatibility is required; Thunderbolt 4 compatibility is optional for device makers.

View full USB4 spec sheet →

Specification Comparison Table

9 Parameters
Parameter / Spec
Pin Count
24 (symmetrical, double-sided)
Standard Base Dimensions
~8.34 x 2.56 mm
Reversible
Yes
EU Mandate (phones/tablets/cameras)
End of 2024 (Directive 2022/2380)
EU Mandate (laptops)
April 28, 2026
Released
August 2019
Max Bandwidth / Data Rate
Up to 40 (Gen 3x2) or 20 (Gen 3x1) Gbit/s
Connector Required
USB-C only
Protocol Foundation
Intel Thunderbolt 3 (donated to USB-IF)