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Black adapter cable with 20-pin USB 3.0 male and 9-pin USB 2.0 female connectors, 5.5 in

EN-Labs

EN-Labs ADUSB20M29F USB 2.0 9-pin Female to USB 3.0 20-pin Male Adapter Cable 5.5 in Black

SKU CH-JBBR-R297F

Connects a USB 3.0 20-pin device to a USB 2.0 9-pin motherboard header at 480 Mbps with a 5.5 in cable

  • Rated speed480 Mbit/s
  • Connection typeMotherboard usb 9pin to 20pin
  • Cable length4 in (10.2 cm)
  • Connector count2
  • Connector genderFemale to Male
  • Product typeAdapter

Style M/F Slim

  • Connect USB 3.0 20-pin devices to USB 2.0 9-pin motherboard headers
  • Data transfer at 480 Mbps under USB 2.0 specification
  • 5 inch cable length fits tight internal spaces
  • Black 20-pin male to 9-pin female connector orientation
  • Enables drive panels and card readers on legacy headers

Adapter cable for USB 2.0 headers

This EN-Labs adapter connects a USB 3.0 20-pin male device to a USB 2.0 9-pin female motherboard header. It suits builders adding a front-panel drive bay or card reader to an older board. The 5.5 in black cable bridges the header mismatch without requiring a new motherboard.

Sustained throughput at USB 2.0 rates

The link meets the USB 2.0 specification, capping data transfer at 480 Mbps even when a USB 3.0 device is attached. Under continuous load the adapter maintains this ceiling without stepping up to USB 3.0 speeds. Performance stays consistent for typical panel or reader workloads.

Limited by the 9-pin header bandwidth

The USB 2.0 9-pin motherboard header sets the hard bandwidth limit at 480 Mbps. A USB 3.0 20-pin device will function but cannot exceed this throughput. Builders needing full USB 3.0 speed must use a native 20-pin header or add a controller card.

How it compares

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

Price $4.99
Cheaper than about 95% of the 15,227 comparable items (median $14.99).

Specifications

Product
Brand nameEN-Lab
Model nameADUSB20M29F
Product typeAdapter
Product colorBlack
Performance
Rated speed480 Mbit/s
Ports & slots
Connection typeMotherboard usb 9pin to 20pin
Connector count2
Connector genderFemale to Male
Size & build
Cable length4 in (10.2 cm)
Overall length4 in (10.2 cm)

Questions about this item

Does the 5.5 inch adapter cable generate noticeable heat or draw extra power when a USB 3.0 drive panel runs all day?

The adapter is a passive 20 pin to 9 pin cable with no active electronics, so it adds no measurable heat or power draw beyond the USB 2.0 480 Mbps signalling.

What motherboard header must I already have free to plug in the 9 pin female end of this adapter?

You need an available USB 2.0 9 pin internal header on the motherboard; the cable’s female connector mates directly with that header.

Will a legacy USB 2.0 9 pin front-panel device still work if I occupy the header with this 20 pin male adapter?

The adapter converts the single 9 pin header to a 20 pin male port, so the original 9 pin device can no longer use that header unless you add a separate splitter.

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