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Small green circuit board with a 19-pin header and two USB A ports

Vszerda

Vszerda USB 3.0 19/20Pin to 2× USB A Adapter PH21

SKU CH-STHF-ND5G4

Adds two USB 3.0 Type-A ports to a motherboard 19/20-pin header for front-panel access

  • Adds two front-panel USB 3.0 ports via a 19/20-pin motherboard header
  • Dual-layer connector design maintains 3.0 signal integrity for lossless transmission
  • Standard 19-pin USB 3.0 header ensures broad motherboard compatibility
  • Two 3 mm mounting holes allow secure DIY installation in custom chassis
  • Reversible left or right orientation fits either side of the front panel

Front-panel USB 3.0 adapter for desktop builders

This adapter converts a motherboard 19 or 20-pin header into two standard USB 3.0 Type-A ports for a case front panel. It uses a dual-layer connector and multi-layer circuit board designed for lossless high-speed signal transmission. The PH21 model includes two 3 mm mounting holes for custom bracket installation. It suits anyone adding or replacing front USB ports on a desktop PC.

Replaces missing or damaged front-panel headers

If a chassis lacks usable front USB 3.0 ports or the original header cable has failed, this adapter restores two ports without replacing the motherboard. The upgrade is worthwhile when the board still has a spare 19 or 20-pin header and the builder wants native 3.0 speeds rather than falling back to 2.0. No internal hub or extra power connection is required.

Suits DIY builders with a free 19 or 20-pin header

The adapter fits standard desktop motherboards that expose a 19 or 20-pin USB 3.0 header and cases with room for the two 3 mm mounting holes. It is not for laptops, external enclosures or systems that only provide 2.0 headers. Buyers needing more than two ports or a different connector orientation should look at other solutions.

How it compares

Measured against everything we stock in USB Cords & Extension Cables, at today’s prices. Recalculated every night.

Price $16.99
Pricier than about 60% of the 15,227 comparable items (median $14.99).

Specifications

No published specifications for this item yet.

Questions about this item

Will the 19-pin header on this PH21 adapter fit my motherboard's USB 3.0 connector?

The PH21 uses a standard USB 3.0 19-pin connector that matches the motherboard header specification.

Which way round does the dual-layer connector go onto the 19-pin header?

The dual-layer USB 3.0 connector is keyed so it only seats one way; align the missing pin position before pressing it in.

Are the two 3 mm mounting holes on the PCB meant for securing the adapter inside the case?

Yes, the two 3 mm holes are provided for DIY mounting to the chassis or a bracket.

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