Side-by-Side Comparison
USB
USB-A vs. USB-C
Comparing 2 standards across 6 specifications. 6 key differences identified.
Comparing:
USB-A
USB-C
USB-A (Standard-A) is the flat rectangular connector on host ports -- computers, chargers, hubs. It used 4 pins for USB 1.x/2.0 speeds; a 9-pin variant, adding 5 SuperSpeed contacts, extended it to USB 3.0+ in 2008 without changing the external shape or requiring a new socket design.
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.
Specification Comparison Table
6 Parameters| Parameter / Spec | ||
|---|---|---|
|
Pin Count
|
4 (USB 1.x/2.0) or 9 (USB 3.0+, adds 5 SuperSpeed contacts) | 24 (symmetrical, double-sided) |
|
Standard Base Dimensions
|
~12 x 4.5 mm | ~8.34 x 2.56 mm |
|
Reversible
|
No | Yes |
|
Typical Role
|
Host / downstream-facing port | — |
|
EU Mandate (phones/tablets/cameras)
|
— | End of 2024 (Directive 2022/2380) |
|
EU Mandate (laptops)
|
— | April 28, 2026 |
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