The Raspberry Pi Compute Module 3 (CM3) and Compute Module 3 Lite (CM3L) are DDR2-SODIMM-mechanically-compatible system on modules (SoMs) containing processor, memory, eMMC Flash (CM3 only), and supporting power circuitry. These modules are a revision to the original Raspberry Pi Compute Module (CM1) and allow a designer to leverage the Raspberry Pi hardware and software stack in their own custom systems and form factors. In addition, these modules have extra IO interfaces over and above what is available on the Raspberry Pi Model A/B boards opening up more options for the designer and are reverse compatible with that of the former Compute Module 1.

The CM3 contains a BCM2837 processor, the same as used on the Raspberry Pi 3, 1 GB LPDDR2 RAM, and 4 GB eMMC Flash. Meanwhile, the CM3L product is the same as CM3 except the eMMC Flash is not included, and instead the SD/eMMC interface pins are available for the user to connect their own SD/eMMC device.

To get started designing a PCB to use the module, Raspberry Pi provides an open-source breakout board with a single module in an affordable development kit.