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Green rectangular circuit board with SODIMM edge connector and CM4 socket, status LEDs visible

WaveShare

WaveShare Raspberry Pi CM4 to CM3 Modular Adapter

SKU CH-C997-3A5MT

Adapter board lets a Compute Module 4 replace a CM3 or CM3+ on existing carrier boards, adding a quad-core Cortex-A72 64-bit processor

  • Use CM4 modules on CM3 baseboards with this adapter
  • Quad-core Cortex-A72 64-bit processor boosts compute power
  • Onboard CM4 connector fits Lite and eMMC variants
  • Buck-boost DC chip accepts 3.3V or 5V input
  • ACT LED shows CM4 status in real time

CM4-to-CM3 adapter board

This modular adapter lets a Raspberry Pi Compute Module 4 plug into an existing CM3 baseboard. It provides a standard CM4 connector and a SODIMM edge that matches the CM3 form factor. An onboard buck-boost regulator accepts 3.3 V or 5 V input. Status LEDs show CM4 activity at a glance.

Makers migrating from CM3 or CM3+

Engineers with CM3 carrier boards who need the 64-bit Cortex-A72 performance of a CM4 can use this board without redesigning their hardware. It is not for projects that must stay on the original CM3 silicon, nor for designs that lack a CM3-compatible SODIMM socket. Buyers who need a CM4 module included should look elsewhere.

Onboard CM4 connector and CM3 SODIMM

The adapter carries a standard CM4 receptacle and a matching CM3 SODIMM footprint. A DC buck-boost chip handles 3.3 V and 5 V supply rails. The CM4 module itself is not supplied.

How it compares

Measured against everything we stock in USB-C Multiport Adapters, at today’s prices. Recalculated every night.

Price $39.99
Pricier than about 80% of the 89 comparable items (median $18.99).

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Specifications

Processor
ProcessorOther

Questions about this item

Which Compute Module 4 variant fits this adapter?

The onboard standard CM4 connector accepts any CM4 Lite or eMMC board, so choose the memory size and wireless option that matches your project.

What performance gain does the Quad Core Cortex A72 64-bit processor give over the original CM3?

Moving to the CM4's 64-bit 72-core architecture provides a significant compute boost for multi-threaded workloads and modern 64-bit OS images.

What does the onboard buck-boost DC chip allow for power input?

It accepts either 3.3V or 5V supply rails, letting you power the adapter from the same rail used by your existing CM3 base board.

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