: The 4-pole stereo audio and composite video port layout. Why You Won't Find a "Full" Version
The central component of the schematic is the Broadcom BCM2711 SoC. Moving away from the older 28nm processes, the BCM2711 is fabricated on a 28nm silicon node but utilizes much higher performance IP blocks.
The official schematic for the Raspberry Pi 4 Model B (revision 1.2, 1.4, and 1.5) is released by (formerly the Raspberry Pi Foundation) under a non-commercial license. It is distributed as a PDF file within the Raspberry Pi Hardware Reference repository on their official website and GitHub. Users should note that while the schematics are publicly accessible, the board’s physical layout (Gerber files) and the proprietary bootloader code are not fully open source. Raspberry Pi 4 Model B Full Schematic
However, there is an immediate and crucial distinction that must be understood: the official schematic, titled raspberry-pi-4-reduced-schematics.pdf , is not a "full" schematic in the traditional sense. This article provides a comprehensive guide to the schematic as it exists, details what hardware information it contains, and explains how to use it effectively for your projects and troubleshooting.
A triple-speed Gigabit Ethernet controller that provides true gigabit performance without the USB bottlenecks found in previous models. : The 4-pole stereo audio and composite video port layout
: Because the schematic does not label all IC part numbers, use community-sourced lists (like the one in this article) to identify what each U-number corresponds to.
| | Benefit | |---------------|--------------| | Custom HAT design | Identify which GPIO pins are already in use (e.g., I2C, SPI, UART) and their voltage levels. | | Power budget analysis | Trace current paths from PMIC to load; calculate maximum peripheral draw. | | Debugging boot failures | Probe power sequencing rails and check RESET signals against the schematic’s timing. | | Low-level software development | Determine which peripherals share internal buses (e.g., Ethernet and USB bandwidth). | | Repair and rework | Locate test points, fuse elements, and alternative component footprints. | The official schematic for the Raspberry Pi 4
The Raspberry Pi 4 Model B has undergone several hardware revisions since its launch. The official schematic is versioned as "4.0" (referring to the PCB version), but the model revisions are labeled v1.1, v1.2, and v1.4. Confusingly, the PCB revision number is printed on the top side of the board, hidden beneath the Ethernet jack, and is not visible to software.