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The Raspberry Pi Foundation provides these schematics under a Creative Commons Attribution-ShareAlike (BY-SA) license for the documentation.
The LPDDR4 RAM is documented with:
Mechanical drawing – Board dimensions, mounting holes, connector locations.
BCM2711 ARM Peripherals datasheet – GPIO, I2C, SPI, PWM, etc. register-level info.
The official schematics are open and available from the Raspberry Pi documentation website.
Download the Raspberry Pi 4 Model B Schematics here (Look for the 'Schematics' section).
Early Pi 4 boards (Rev 1.1) could not negotiate power with smart e-marked USB-C cables. Why? The schematic shows the original used two separate CC lines via resistors, breaking the standard. Raspberry Pi 4 Model B Full Schematic
The Raspberry Pi 4 is a triumph of integration. Looking at the full schematic moves you from being a user of the platform to a master of it. It demystifies the board and proves that the Pi isn't just a toy—it's a serious piece of embedded engineering.
So, download the PDF, zoom in on that PMIC block, and take a moment to appreciate the "blueprint" of the world's favorite single-board computer.
Raspberry Pi 4 Model B Full Schematic is a critical resource for advanced users, hardware engineers, and developers looking to understand the intricate circuit design of the flagship single-board computer. Technical Breakdown & Layout Core Architecture : The schematic details the integration of the Broadcom BCM2711
SoC, highlighting the four Cortex-A72 CPU cores and the VideoCore VI GPU. Power Management : It maps out the transition to USB-C power
, specifying the required 5V/3A input and the internal voltage rails like the 3.3V supply for the GPIO bank. Peripheral Connectivity
: You’ll find clear diagrams for the dual micro-HDMI ports (supporting 4K), Gigabit Ethernet, and the mix of two USB 3.0 and two USB 2.0 ports. Expansion Headers : The document provides the exact pinout for the 40-pin GPIO header The Raspberry Pi Foundation provides these schematics under
, including labels for primary functions like SPI, I2C, and UART, as well as the PoE (Power over Ethernet) header. The Pi4J Project – Pin Numbering - Raspberry Pi 4B
While the official "full" engineering schematics for the Raspberry Pi 4 Model B Go to product viewer dialog for this item.
have not been publicly released due to proprietary design elements, the official Raspberry Pi 4 Reduced Schematics provide a comprehensive overview of the board's primary hardware architecture and signal routing. Core Hardware Components Raspberry Pi 4 Model B
is built around a complex system-on-chip (SoC) and several dedicated controllers that manage power, networking, and high-speed data.
SoC (BCM2711): The central hub of the board, featuring a quad-core 64-bit ARM Cortex-A72 processor.
PMIC (MXL7704): A Power Management Integrated Circuit that regulates and distributes various voltage rails across the board. BCM2711 ARM Peripherals datasheet – GPIO, I2C, SPI,
USB Controller (VIA VL805): A dedicated PCIe-connected chip that manages the two USB 3.0 and two USB 2.0 ports.
Ethernet Transceiver (BCM54213PE): A triple-speed Gigabit Ethernet controller that provides true gigabit performance without the USB bottlenecks found in previous models.
Memory (LPDDR4): High-speed SDRAM available in configurations ranging from 1GB to 8GB. Key Circuit Sections
The reduced schematic diagrams typically detail the following critical subsystems: Raspberry Pi 4 Model B specifications
The 2GB, 4GB, or 8GB LPDDR4 RAM is soldered on top of the processor (Package-on-Package). The schematic shows the termination resistors (VTT) and decoupling capacitors.