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Green PCB mini base board with B-to-B connector, 40-pin GPIO, USB 2.0 Type A, 15-pin CSI, microSD slot

NuoTo

NuoTo Raspberry Pi 4 Model A Mini Base Board for CM4 B-to-B Connector Quad Core 64-bit Expansion Board

SKU CH-WXTX-D7H4J

Mini base board adds Gigabit Ethernet, PCIe, USB 2.0, MIPI CSI-2 and 40-pin GPIO to any Compute Module 4 via a stable B-to-B connector

  • Gigabit Ethernet with IEEE 1588 support enables precise network timing
  • Quad-core 64-bit BCM2711 processor delivers strong compute performance
  • B-to-B connector design improves mechanical stability over gold-finger layouts
  • Optional wireless module with on-board and external antenna suits industrial use
  • On-board PCIe interface expands peripheral options in tight spaces

Compact Base Board for CM4 Compute Modules

The NuoTo Raspberry Pi 4 Model A Mini Base Board is a barebone carrier designed for the Compute Module 4. It provides essential I/O in a small PCB footprint, targeting developers building web applications or embedded Linux devices. The board accepts any version of the CM4, including variants without onboard eMMC storage. It suits engineers who need a minimal platform for rapid prototyping.

B-to-B Connector Replaces Gold-Finger Interface

The single specification that determines compatibility is the board-to-board connector, which replaces the gold-finger edge connector used on earlier Compute Module generations. This change improves mechanical stability and signal integrity for the CM4's BCM2711 quad-core Cortex-A72 64-bit processor. Builders using older CM3 or CM3+ modules cannot use this carrier; it is exclusively for CM4 modules.

Onboard Gigabit Ethernet and PCIe Expansion

Bundled accessories are limited to a straight-pin 40-pin GPIO header for custom wiring. The board itself integrates a Gigabit Ethernet port with IEEE1588 support, a USB2.0 Type-A port, a 15-pin MIPI CSI camera connector and a microSD slot for non-eMMC modules. An onboard PCIe interface enables high-speed peripheral expansion, while wireless variants add dual-band Wi-Fi and Bluetooth with PCB or external antenna options.

How it compares

Measured against everything we stock in Mini PC Barebone Systems, at today’s prices. Recalculated every night.

Price $62.99
Cheaper than about 97% of the 1,735 comparable items (median $564.99).

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Specifications

Processor
ProcessorOther

Questions about this item

What does the BCM2711 quad-core Cortex-A72 64-bit processor deliver in a real machine?

The BCM2711 quad-core Cortex-A72 64-bit processor provides strong performance for web application development and industrial tasks, handling multi-threaded workloads efficiently in a compact form factor.

What does the Gigabit Ethernet with IEEE1588 support cap in practice?

The onboard Gigabit Ethernet supports IEEE1588 precision time protocol, enabling accurate network timing for industrial applications while delivering standard wired network speeds up to 1 Gbps.

What does the B-to-B connector design need to fit the Compute Module 4?

The B-to-B connector directly mates with all versions of the Compute Module 4, replacing the older gold-finger design for a more stable connection on the mini base board.

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