Raspberry Pi 4 Model B ^hot^ Full Schematic | RELIABLE · 2026 |

The schematic confirms the wiring for two micro-HDMI ports, allowing for dual 4K output at 30Hz (or a single 4K at 60Hz). Where to Find Schematics

The Pi 4B uses a dedicated PMIC (Power Management IC) to generate all the required voltage rails from the 5 V USB‑C input. Early revisions used a , while later revisions (especially those with 8 GB of RAM) adopted a more capable DA9090 to supply the higher current needed by the denser memory. The schematic shows the PMIC, its external inductors, and the feedback networks.

The official documentation serves as a high-level technical reference for engineers. Key sections typically covered in these diagrams include: Raspberry Pi 4 Model B Full Schematic

: True Gigabit Ethernet is implemented via the Broadcom BCM54213PE PHY, which connects directly to the SoC’s RGMII interface. The 40-Pin GPIO Header

The full schematic is organized into logical functional blocks, typically spanning 6 to 8 pages. Below is a breakdown of the critical subsystems: The schematic confirms the wiring for two micro-HDMI

For most makers, this is the most important page. The schematic maps every pin on the 40-pin header to the BCM2711 balls.

: It requires a 5V / 3A DC input via USB-C. The schematic shows the PMIC, its external inductors,

Below is a summary of the major differences.

In the first hardware revision (Rev 1.1), the schematic shows that the USB-C port's two pins share a single 5.1K ohm resistor (Rd) to ground, rather than each having its own dedicated resistor.

The Raspberry Pi Foundation has made the schematic for the Pi 4 Model B publicly available on its official documentation site. The direct link to the PDF file is:

When engineers look for a full schematic of the Raspberry Pi 4 Model B, they encounter a specific documentation approach from Raspberry Pi Ltd. Rather than publishing a complete production-ready circuit diagram with internal multi-layer trace routings and proprietary Broadcom silicon blueprints, the official release is a highly detailed Raspberry Pi 4 Reduced Schematic . This document strips away internal proprietary system-on-chip (SoC) logic networks but maps out every external electrical connection, passives chain, interface port, and power plane. For hardware designers leveraging tools like SnapMagic to download symbols and footprints, this schematic serves as the ultimate functional source of truth for physical board layout and system debugging. System on Chip and Memory Topography