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Green circuit board with gold U.3 connector and M.2 slot

Innocard

Innocard U.3 (SFF-8639) PCIe Gen4 to M.2 NVMe SSD (22x80mm) Adapter

SKU CH-0HQZ-0A12Y

Converts a 22x80mm M.2 NVMe SSD to a U.3 (SFF-8639) PCIe Gen4 interface with built-in 12V-to-3.3V power conversion and protection

  • Adapter typePCIe Gen4
  • Gen 4 16GT/s bandwidth for fast NVMe speeds
  • U.3 SFF-8639 to M.2 22x80mm conversion fits enterprise drives
  • Built-in 12V to 3.3V PWM buck converter delivers 5.5A max current
  • Multiple protection circuits include OCP UVLO OVP thermal shutdown and ESD HBM 500V
  • Designed and made in Taiwan with SFF-9402 Rev1.1 compliant pin-out

U.3-to-M.2 NVMe adapter

This PCIe Gen4 adapter converts a U.3 (SFF-8639) bay to accept a 22x80mm M.2 NVMe SSD. It includes a built-in SFF-8639 connector with pin-out defined by SFF-9402 Rev1.1 and a PWM 12V-to-3.3V synchronous buck converter supplying up to 5.5A. Protection features cover overcurrent, undervoltage, over/under voltage, thermal shutdown and 500V HBM ESD. The board is designed and made in Taiwan.

Suits builds needing PCIe Gen4 NVMe in a U.3 slot

It supports M.2 3.3V and 1.8V supply rails plus VIO_CFG, PERST#, CLKREQ# and WAKE# signal translation between 3.3V and 1.8V levels. Hot-plug power uses an eFuse with programmable 6.5A current limit and inrush slew-rate control. A 400W TVS diode protects the 3.3V input and the output stage uses a 32mΩ NexFET with Schottky rectifier. Builders whose backplane cannot deliver 12V to the converter or who need a different M.2 form factor should look elsewhere.

PCIe Gen4 16GT/s interface

The adapter runs at Gen 4 16GT/s across the U.3 link, so the host must provide a PCIe Gen4 U.3 connection for full bandwidth. M.2 PERST# and PWRDIS signals are passed through from the U.3 pins. No other interface speed or protocol is supported by this board.

How it compares

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Price $41.99
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 U.3 adapter and which step is often missed?

Plug the M.2 22x80mm NVMe SSD into the onboard slot, secure it with the screw, then insert the SFF-8639 end into the U.3 backplane; the step often missed is connecting the PERST# and CLKREQ# signal translators so the drive negotiates 3.3 V and 1.8 V levels correctly.

What maintenance or replacement will this adapter need over time?

The PWM buck converter and eFuse are rated for continuous 5.5 A output with 6.5 A programmable limit; under normal loads no user-serviceable parts wear out, but if the thermal shutdown triggers repeatedly the MOSFET or TVS diode may need board-level replacement.

What limit appears first when the adapter runs under sustained heavy I/O?

The 5.5 A maximum output current of the 12 V-to-3.3 V synchronous buck converter is the first hard ceiling; exceeding it trips the over-current protection and thermal shutdown before any signal-integrity limit is reached.

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