Side-by-Side Comparison
USB
USB 1.1 vs. USB-A
Comparing 2 standards across 8 specifications. 8 key differences identified.
Comparing:
USB 1.1
USB-A
USB 1.1, released in September 1998, was the first widely adopted USB standard -- 12 Mbit/s Full Speed for most peripherals, with a 1.5 Mbit/s Low Speed mode for mice and keyboards. The original USB 1.0 from January 1996 saw little real-world adoption before 1.1 quickly superseded it.
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.
Specification Comparison Table
8 Parameters| Parameter / Spec | ||
|---|---|---|
|
Released
|
September 1998 | — |
|
Full Speed
|
12 Mbit/s | — |
|
Low Speed
|
1.5 Mbit/s | — |
|
Predecessor
|
USB 1.0 (January 1996, limited real-world adoption) | — |
|
Pin Count
|
— | 4 (USB 1.x/2.0) or 9 (USB 3.0+, adds 5 SuperSpeed contacts) |
|
Standard Base Dimensions
|
— | ~12 x 4.5 mm |
|
Reversible
|
— | No |
|
Typical Role
|
— | Host / downstream-facing port |
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