Raspberry Pi Compute Module 4 industrial carrier board supports M.2 NVMe SSD, 4G LTE modem

Since the Raspberry Pi Compute Module 4 launch last fall, we’ve seen several interesting carrier boards for the system-on-module including Wiretrustee to build a NAS with up to four SATA drives, the compact, Arduino-sized Piunora board that also include an M.2 socket, or Over:Board mini-ITX carrier board.

Oratek brings another one specially designed for industrial use cases with TOFU Raspberry Pi Compute Module 4 carrier board offering wide DC input, Gigabit Ethernet with PoE, M.2 NVMe SSD or 4G LTE modem support, among many other features.

Raspberry Pi Compute Module 4 industrial carrier board


  • Raspberry Pi Compute Module 4 socket
  • Storage
    • NVMe SSD via M.2 2242 Key B socket (See Expansion section)
    • MicroSD card slot
  • Video Output
    • HDMI 2.0 port up to 4Kp60
    • MIPI DSI connector for Raspberry Pi LCD display
  • Camera – 1x MIPI CSI connector for Raspberry Pi camera
  • Connectivity
    • Gigabit Ethernet port with PoE
    • Optional WiFI 5 and Bluetooth 5.0 on Raspberry Pi CM4 module
    • Optional 3G/4G LTE (USB) modem via M.2 2242 Key B socket (See Expansion section)
  • USB – 3x USB 2.0 Type-A ports, 1x USB-C OTG port
  • Expansion
    • 40-pin Raspberry Pi GPIO header
    • M.2 2242 Key B socket with micro-SIM cardholder
  • Misc – LEDs, , boot selection,
  • Power Supply
    • 7.5 to 28V via 5.5/2.1mm power barrel jack or 2-pin 3.5mm terminal block.
    • 5V via USB-C port, but not sufficient for M.2 cards
    • 3-pin Input voltage breakout header designed to power HAT or other expansion boards
    • Circuit protections added for safety reasons (ESD, over-and reverse-current protections) including 5V/3.5A fuse
  • Dimensions  – 9×9 cm and M3 mounting holes

4G LTE Raspberry Pi CM4

The board is designed to work with a CM4 module running Raspberry Pi OS with minimal changes to config.txt and the enablement of nvme-coremodule in the OS as explained in the Wiki that also includes mechanical files and PDF schematics.

Oratek has successfully tested several M.2 cards with the carrier board. Two NVMe SSDs with the 128GB KingSpec NE 2242 and Western Digital PC SN520, and three wireless modules, namely Huawei ME908s-158 & ME936, plus Sierra Wireless AirPrime EM7345.

Industrial Raspberry Pi CM4 carrier board specifications

Oratek TOFU can be pre-ordered on the company’s online store for 99 CHF or $109.33 including taxes. Shipping is expected to start in mid-March. You’ll still need to purchase Raspberry Pi Compute Module 4 separately in a configuration that meets your needs. The company can also customize the board, i.e. remove unneeded connectors and/or chips, for orders of more than 200 units.

Via Tom’s hardware and LinuxGizmos

Share this:

Support CNX Software! Donate via cryptocurrencies, become a Patron on Patreon, or purchase goods on Amazon or Aliexpress

ROCK 5 ITX RK3588 mini-ITX motherboard
Notify of
The comment form collects your name, email and content to allow us keep track of the comments placed on the website. Please read and accept our website Terms and Privacy Policy to post a comment.
3 years ago

There are countless other CM4 carrier boards available in the meantime. Jeff Geerling started with an Github issue in his raspberry-pi-pcie-devices repository that ended up here: https://pipci.jeffgeerling.com/boards_cm

3 years ago

Why not two M.2 slots? Routing the USB2 signals to the 2242 slot for those wireless cards and the PCIe lane to a separate 2280 key M slot.

Key B, 2242 and NVMe is such a weird combination. Only a few rather expensive or crappy SSDs with key B-M coding will fit while key M combined with 2280 will allow for hundreds of SSDs…

3 years ago

2280 is too long for a 9cm board.

3 years ago

8 cm on 9 cm board? Possible unless there routing or layout issues. In which case make the board a bit larger. Squandering the M.2 on the cell module that needs USB is bad move too.

3 years ago

The photo shows a 42mm component. At almost double that length, it would be tight.

A smaller module seems like a reasonable compromise – you’ve identified a niche for a 12x12cm Nano-ITX carrier board! 🙂

The board would certainly have ample room to accommodate two M.2 slots side by side, as tkaiser suggested.

3 years ago

Those guys missed an opportunity to create a real nice board using 2 M.2. one for USB cell nodule and one for 2280 SSD. Hardly any more cost. They could have offered low cost models with one or both M.2 connectors not populated to save a few bucks. Maybe some 0 ohm resistors near compute module so there aren’t unterminated long traces if required.

Jeff Geerling
3 years ago

One other consideration is that you’d need to add a PCIe switch if you wanted to have more than one slot. That does add to the BoM and also adds more to the complexity of the board layout. Not impossible to do in such a small board, but it would probably be difficult and jack up the price a bit more.

There are a couple ITX and micro-ATX designs that look promising, though, which do incorporate PCIe switches and have multiple M.2 slots (and/or multiple PCI express slots), and I’m watching them all with interest!

3 years ago

A 2280 SSD is fine on 9cm, I checked it on a NanoPC T4 before sending the comment.

Khadas VIM4 SBC