Raspberry Pi 4 Model B [new] Full Schematic May 2026

While a "full" schematic for the Raspberry Pi 4 Model B Go to product viewer dialog for this item.

is not publicly released by the Raspberry Pi Foundation due to proprietary designs, a Reduced Schematic PDF is available. This official document covers essential I/O blocks, such as the USB-C power input and the 40-pin GPIO header, while omitting the complex internal routing of the Broadcom SoC and RAM. Key Schematic Sections

Broadcom BCM2711 SoC: The central 64-bit quad-core processor. In the reduced schematic, this is typically represented as a simplified block with main interface lines.

Power Management (PMU): Details the USB-C power input circuitry, which requires a 5V/3A supply. It includes specific voltage regulators for the DDR memory and SoC rails. Raspberry Pi 4 Model B Full Schematic

40-Pin GPIO Header: A complete pinout including power pins (5V, 3.3V), Ground, and programmable pins for SPI, I2C, and UART. Connectivity Blocks: Dual Micro-HDMI: Supports resolutions up to 4Kp60.

Gigabit Ethernet & USB 3.0: Schematics show the connection to the VL805 USB controller and the Ethernet PHY.

MIPI CSI/DSI: Interface paths for camera and display flex cables. Raspberry Pi 4 Model B specifications While a "full" schematic for the Raspberry Pi

Technical Analysis: Raspberry Pi 4 Model B Full Schematic

6. How to Obtain and Use the Schematic

  1. Visit the official Raspberry Pi hardware documentation page:
    https://www.raspberrypi.com/documentation/computers/raspberry-pi.html
  2. Download the PDF file named:
    Raspberry_Pi_4_Model_B_Schematic.pdf (current revision 1.5)
  3. Open with a PDF reader; use search for net names (e.g., GPIO2, USB_DP, PWR_LED).
  4. For advanced analysis, import the PDF into vector editing software (e.g., Inkscape) or use a schematic capture tool that supports PDF import (e.g., KiCad’s PDF to schematic plugin, though manual re-drawing is often required).

3. The USB 3.0 Hub (Via Labs VL805)

The Pi 4 marked the debut of true USB 3.0 support. The schematic shows the Via Labs VL805 controller. This chip sits between the BCM2711 and the USB ports.

If you look closely at the schematic, you can trace how the PCIe interface of the CPU connects to this hub. This explains why the Pi 4 can handle high-speed storage devices, and it is the basis for many cool projects involving custom USB configurations.

2. Navigating the Schematic: A Page-by-Page Tour

The official schematic spans approximately 10 to 12 pages. It is dense but logically organized. Let’s open the PDF and walk through it. Technical Analysis: Raspberry Pi 4 Model B Full

Key schematic areas — detailed walkthrough

Raspberry Pi 4 Model B — Full Schematic Deep Dive

March 23, 2026

This post examines the Raspberry Pi 4 Model B full schematic, explains key subsystems, highlights design trade-offs, and offers practical guidance for engineers, makers, and educators who want to understand or extend the platform. It assumes familiarity with digital electronics, PCB design, power-supply principles, and embedded Linux basics.