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Green circuit board with M.2 slot and U.3 connector, silver components, black PCB edges

Innocard

Innocard GD1402A M.2 to U.3 adapter

SKU CH-XZ3A-54JYN

Converts an M.2 NVMe SSD to a U.3 SFF-8639 bay with PCIe Gen4 support and built-in 12V-to-3.3V power conversion

  • Adapter typePCIe Gen4
  • Converts M.2 NVMe drives to U.3 SFF-8639 interface
  • Delivers up to 5.5 A at 3.3 V via synchronous buck converter
  • Protects SSD with 400 W TVS and 500 V HBM ESD safeguards
  • Supports hot-plug with eFuse and programmable 6.5 A current limit
  • Translates 3.3 V and 1.8 V signals for PERST#, CLKREQ# and WAKE#

Adapter for M.2 NVMe to U.3 conversion

The Innocard GD1402A converts an M.2 NVMe solid-state drive to a U.3 SFF-8639 interface. It uses a built-in 30u connector with pin-out defined by SFF-9402 Rev 1.1. The adapter suits builders who need to install an M.2 22x80mm drive into a U.3 backplane or enclosure.

On-board power conversion with protection

A synchronous buck converter steps 12 V down to 3.3 V for the M.2 NVMe SSD with a 5.5 A maximum output current and a 6.5 A programmable limit. Protection includes output discharge control, overcurrent protection, undervoltage lock-out, over/under voltage protection and thermal shutdown. The 3.3 V input is guarded by a 400 W TVS and the output uses a 32 m ohm NexFET plus a Schottky barrier rectifier. ESD HBM rating is 500 V.

Fits M.2 22x80mm drives into U.3 bays

The adapter accepts M.2 3.3 V and 1.8 V supplies and translates VIO_CFG, PERST#, CLKREQ#, WAKE# and PWRDIS signals between voltage levels. Hot-plug power with eFuse protection is built in for the M.2 NVMe SSD. It does not suit drives longer than 80 mm or builders who need a second card slot.

How it compares

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Price $42.99
Pricier than about 85% of the 1,761 comparable items (median $18.99).

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Specifications

Product
Adapter typePCIe Gen4

Questions about this item

How do I install the Innocard GD1402A adapter and what step is often missed?

Insert the M.2 22x80mm NVMe SSD into the onboard slot, then connect the SFF-8639 U.3 interface to the backplane. The step often missed is ensuring the 3.3V VIO_CFG, PERST#, CLKREQ# and WAKE# signal translators align with your drive's 1.8V or 3.3V logic levels.

What maintenance or replacement will the GD1402A need over time?

The onboard PWM buck converter, 32 m ohm NexFET, Schottky rectifier and 400W TVS diodes are solid-state with no moving parts. No scheduled maintenance is required; only replace the unit if the 5.5A overcurrent protection, UVLO or thermal shutdown trips repeatedly, indicating component fatigue.

What limit appears first when the adapter runs under sustained load?

The 5.5A maximum output current of the 12V-to-3.3V synchronous buck converter is the first hard limit. If the M.2 SSD draws more, the programmable 6.5A overcurrent protection and thermal shutdown will activate, throttling or cutting power to protect the drive.

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