Raspberry Pi 4 Model B Full Schematic |top|

Unlike previous generations where the RAM was packaged directly on top of the CPU (Package-on-Package), the Pi 4 decouples them. The schematic shows a dedicated high-speed point-to-point bus connecting the BCM2711 to an external LPDDR4 SDRAM IC.

The official reduced schematic is a that summarises the board at a high level. Let’s break down exactly what you can and cannot find.

The Raspberry Pi 4 Model B represents a foundational shift in the capabilities of low-cost, single-board computers. To fully appreciate its desktop-class performance, hardware engineering teams, developers, and repair technicians rely heavily on its electrical schematics. Understanding how its multi-layered subsystems interact is critical for diagnosing hardware failures, engineering custom expansion boards, or integrating the platform into embedded industrial applications. The Architecture of the Official Schematic Raspberry Pi 4 Model B Full Schematic

Below is a summary of the major differences.

As of 2026, Raspberry Pi Trading Ltd. provides reduced schematics (covering essential connections like power, HDMI, and USB) rather than the complete, granular PCB design files. Official Reduced Schematic (PDF): Download the RP-008345-DS Reduced Schematics Mechanical Drawings (PDF/Step): Download Technical Drawings (via PIP Portal) 3D Models (STEP/SLDPRT): GrabCAD Raspberry Pi 4 Model B Library ⚡ Hardware Breakdown: What’s Under the Hood? Unlike previous generations where the RAM was packaged

If you are designing an add-on board (HAT), the reduced schematic + GPIO documentation is sufficient. If you are trying to repair a Pi 4, the reduced schematic plus multimeter probing usually works.

The board includes a Gigabit Ethernet port (enabled by a dedicated Ethernet controller) and onboard 2.4 GHz/5.0 GHz IEEE 802.11ac wireless connectivity with Bluetooth 5.0. Let’s break down exactly what you can and cannot find

The Raspberry Pi 4 Model B represents a monumental shift in the single-board computer (SBC) landscape. For hardware engineers, embedded developers, and advanced makers, understanding the official schematics is crucial for troubleshooting, custom hardware design, and optimization.

Understanding the Raspberry Pi 4 Model B Full Schematic: A Complete Hardware Guide