Raspberry Pi 4 Model B Full Schematic -

  • Mechanical drawing – Board dimensions, mounting holes, connector locations.

  • BCM2711 ARM Peripherals datasheet – GPIO, I2C, SPI, PWM, etc. register-level info.

    • A dedicated section covers the MaxLinear MxL7704 PMIC. The schematic reveals:

    The official schematic for the Raspberry Pi 4 Model B (revision 1.2, 1.4, and 1.5) is released by Raspberry Pi Ltd. (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.

    First, a clarification. When you search for Pi schematics, you might find two types of documents:

    Note: While the Raspberry Pi Foundation releases detailed schematics, they do not release the full PCB layout files (the actual traces and copper layers) due to proprietary manufacturing information. However, the schematic is all you need to understand the logic of the board.

    When designing a HAT for the Pi 4, you cannot just copy the Pi 3 schematic. The Pi 4 has different voltage tolerances.

    Conclusion The Raspberry Pi 4 Model B schematic is a compact, professionally engineered reference design balancing cost, performance and compatibility. Use the schematic to guide safe modifications, add-ons, and custom enclosures—especially respecting power sequencing, DDR routing and high-speed signal integrity. For any board-level modification or product design, always validate with the latest official schematic and run EMC/thermal testing before deployment.

    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.

    USB Controller (VIA VL805): A dedicated PCIe-connected chip that manages the two USB 3.0 and two USB 2.0 ports. Raspberry Pi 4 Model B Full Schematic

    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 Raspberry Pi 4 Model B represents a massive leap in single-board computing. To truly understand its power, you need to dive into its blueprint. Exploring the full schematic reveals how this tiny board handles high-speed data, dual displays, and power management. The Heart of the Board: Broadcom BCM2711

    At the center of the schematic sits the Broadcom BCM2711 SoC. Unlike its predecessors, this chip uses a 28nm process. It features a quad-core Cortex-A72 architecture. This shift allows for faster clock speeds and better thermal efficiency. Processor: Quad-core 64-bit ARM v8. Speed: 1.5GHz (upgradable via firmware). Video: VideoCore VI supports OpenGL ES 3.x. Power Delivery and Management (PMIC)

    Powering the Pi 4 is more complex than older models. The schematic shows a dedicated MxL7704 PMIC (Power Management Integrated Circuit). This chip regulates the 5V input from the USB-C port into the various voltages needed by the RAM and SoC. Input: USB-C (5V / 3.0A recommended). Regulation: Provides 3.3V, 1.8V, and 1.1V rails.

    Safety: Includes overvoltage and thermal shutdown protection. Memory and High-Speed I/O

    The Pi 4 schematic highlights the move to LPDDR4 RAM. Depending on your model, you’ll see routing for 2GB, 4GB, or 8GB modules. USB 3.0 and Ethernet

    For the first time, the Ethernet controller is not bottlenecked by the USB bus. The schematic reveals a dedicated RGMII interface for the Gigabit Ethernet. USB Controller: Via Labs VL805 PCIe to USB 3.0. Networking: Broadcom BCM54213PE Gigabit PHY. Throughput: Full 1Gbps speeds are now achievable. Dual Display Architecture

    The schematic shows two micro-HDMI ports. These are driven by the SoC's upgraded display pipeline. It supports two 4K displays simultaneously at 30Hz, or a single 4K display at 60Hz. Ports: 2x Micro-HDMI. Audio: Digital audio is embedded in the HDMI signal.

    Legacy: 4-pole composite video remains available via the 3.5mm jack. GPIO and Expansion

    The 40-pin GPIO header remains a staple. The schematic confirms it is backward compatible with older HATs. However, it adds new "muxing" options for UART, SPI, and I2C, giving developers more flexibility for complex sensor arrays. Key GPIO Features: Standard: 27 GPIO pins. Power: 3.3V and 5V power pins available. Ground: Multiple ground points for signal integrity.

    💡 Pro Tip: Always check the official Raspberry Pi Foundation hardware documentation for the most recent PCB revision (e.g., v1.2 or v1.4) to ensure your wiring matches your specific board. BCM2711 ARM Peripherals datasheet – GPIO, I2C, SPI,

    If you’re looking to build something specific, I can help you: Find pinout diagrams for the 40-pin header. Troubleshoot voltage drop issues in your circuit. Identify compatible HATs for your project.

    Raspberry Pi 4 Model B: Deep Dive into the Schematic and Architecture

    The Raspberry Pi 4 Model B marked a significant evolution for single-board computers, shifting from a hobbyist tool to a genuine entry-level PC replacement. For engineers and advanced makers, understanding its internal layout is crucial for troubleshooting and custom hardware integration. The Official "Reduced" Schematic

    It is important to note that the Raspberry Pi Ltd. has never released a full, component-level schematic for the Raspberry Pi 4 Model B. Instead, they provide a Reduced Schematic which focuses on the primary user interfaces rather than the internal power management or high-speed proprietary signal routing. Key Insights from the Schematic:

    Processor Core: Centered around the Broadcom BCM2711 SoC, a quad-core Cortex-A72 (ARM v8) 64-bit processor.

    Power Input: Transitions to USB-C, requiring a 5V DC supply at a minimum of 3A.

    Dual-Display Routing: The schematic reveals two micro-HDMI ports, each capable of supporting up to 4Kp60 resolution.

    Peripheral Connectivity: Layout for two USB 3.0 ports and two USB 2.0 ports, alongside a true Gigabit Ethernet port. Hardware Architecture Highlights

    The Pi 4’s architecture provides approximately 3x the performance of the previous Pi 3 Model B+. Raspberry Pi 4 Model B specifications

    Understanding the Raspberry Pi 4 Model B "Reduced" Schematic If you’ve ever looked for a "Full Schematic" of the Raspberry Pi 4 Model B

    , you’ve likely hit a wall. Unlike early models, the Raspberry Pi Foundation now only releases Reduced Schematics. These official diagrams provide just enough detail for hardware designers and hobbyists to build add-ons without exposing proprietary design secrets. What’s Included in the Official Schematics?

    The official documentation serves as a high-level technical reference for engineers. Key sections typically covered in these diagrams include:

    Broadcom BCM2711 SoC: The brain of the board, a 64-bit quad-core processor @ 1.8GHz. A dedicated section covers the MaxLinear MxL7704 PMIC

    40-pin GPIO Header: Detailed pinout for interfacing with sensors and HATs.

    USB-C Power Input: Wiring for the 5V DC power supply (minimum 3A recommended).

    Dual Micro HDMI Ports: Pin configurations for the two 4Kp60 supported displays.

    PoE Header: Dedicated pins for using a Power over Ethernet HAT.

    AV Jack: The 4-pole stereo audio and composite video port layout. Why You Won't Find a "Full" Version

    The Raspberry Pi Foundation has explicitly stated in community forums that full schematics—including all component values, traces, and internal layers—are unlikely to be released. This is largely due to the proprietary nature of certain parts of the board design and the Broadcom SoC. Where to Find More Technical Details

    For those looking to dive deeper than the basic schematics, you can reference these authoritative technical documents:

    Official Reduced Schematic (PDF): The most accurate starting point for hardware developers.

    Raspberry Pi 4 Model B Datasheet: Includes electrical specifications, power requirements, and GPIO multiplexing modes.

    Raspberry Pi 4 Product Brief: Provides physical specifications and mechanical dimensions in millimeters.

    Pro Tip: If you are designing a custom PCB or carrier board, look into the Compute Module 4 (CM4) documentation. It is "loosely based" on the Pi 4 Model B

    and often provides more granular interface data for industrial designers.

    Are you planning to build a custom expansion board or just trying to troubleshoot a specific component on your Pi? Raspberry Pi 4 Model B specifications

    Practical notes:

    The full schematic is organized into logical functional blocks, typically spanning 6 to 8 pages. Below is a breakdown of the critical subsystems: