Side-by-Side Comparison
USB
USB-B vs. USB Power Delivery
Comparing 2 standards across 8 specifications. 8 key differences identified.
Comparing:
USB-B
USB Power Delivery
USB-B (Standard-B) is the squarish connector historically used on printers, scanners, and external hard drives -- the peripheral-side counterpart to USB-A. A 9-pin SuperSpeed variant with a distinctive stacked upper tab was added for USB 3.0, though USB-C has since displaced Standard-B in most new peripheral designs.
USB Power Delivery (USB PD) is a separate negotiation protocol governing how much power flows over a USB-C cable -- independent of the cable's data speed. Standard Power Range tops out at 100W (20V/5A); PD 3.1's Extended Power Range (2021) raised that ceiling to 240W (48V/5A), requiring cables with a built-in identification chip.
Specification Comparison Table
8 Parameters| Parameter / Spec | ||
|---|---|---|
|
Pin Count
|
4 (USB 1.x/2.0) or 9 (USB 3.0+, stacked SuperSpeed tab) | — |
|
Standard Base Dimensions
|
~11.1 x 7.0 mm | — |
|
Reversible
|
No | — |
|
Typical Role
|
Peripheral-side port (printers, scanners, external drives) | — |
|
PD 1.0
|
— | 2012 -- up to 60W |
|
PD 2.0
|
— | 2013 -- up to 100W (Standard Power Range, 20V/5A) |
|
PD 3.1 (EPR)
|
— | 2021 -- up to 240W (Extended Power Range, 48V/5A) |
|
EPR Cable Requirement
|
— | Built-in E-Marker identification chip |
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