Raspberry Pi 4 Model B !link! Full Schematic Jun 2026
The ubiquitous is fully backwards‑compatible with previous Raspberry Pi boards. The reduced schematic clearly maps each pin to a BCM2711 GPIO, power rail (3.3 V, 5 V), or ground. This is the section most often used by HAT designers.
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: 27 GPIO pins. Power: 3.3V and 5V power pins available. Ground: Multiple ground points for signal integrity.
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. USB-C (5V / 3.0A recommended). Regulation: Provides 3.3V, 1.8V, and 1.1V rails.
The reduced schematics are and are provided “as is” for non‑commercial, educational, and personal use. You are allowed to: Raspberry Pi 4 Model B Full Schematic
In contrast to fully open-source hardware projects, the commercial ecosystem of Raspberry Pi relies heavily on proprietary system-on-chip technology from Broadcom. Consequently, a comprehensive schematic containing every internal silicon connection, multi-layer board routing path, and complete Bill of Materials has never been publicly disclosed. The official Raspberry Pi Hardware Documentation provides an updated, multi-page Raspberry Pi 4 Reduced Schematic drawn by James Adams. This file deliberately omits the dense, complex high-speed memory bus routings connecting the Broadcom SoC to the LPDDR4 RAM modules, as well as the internal physical layout of the multi-layer printed circuit board. Despite these omissions, the document provides detailed mapping for power subsystems, interface lines, external connectors, and protection circuitry. Core Silicon and System Architecture Raspberry Pi 4 Model B
For those looking to dive deeper than the basic schematics, you can reference these authoritative technical documents:
The represents a significant leap forward in the world of single‑board computing. Since its release, this compact yet powerful computer has powered everything from DIY media centres and retro gaming consoles to industrial automation systems and edge‑AI projects. For engineers, hardware developers, and enthusiastic tinkerers, understanding the board at a schematic level is the first step toward creating custom hardware, designing add‑on boards, or troubleshooting complex issues. The 40-pin GPIO header remains a staple
Many university courses on embedded systems and computer architecture use the Pi 4B as a case study. The schematic is a perfect medium to teach , from the PMIC’s power‑good sequencing to the differential signalling of the HDMI ports.
Early revisions (Rev 1.1) of the Raspberry Pi 4 schematic revealed a notorious design oversight: both Configuration Channel (CC1 and CC2) pins on the USB-C port shared a single
The RAM is stacked on top of the SoC using technology, which saves board space. The schematic does not show the internal routing to the RAM chips; only the power and control signals are exposed. Available RAM sizes are 1 GB, 2 GB, 4 GB, and later 8 GB. Key GPIO Features: 27 GPIO pins
: 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.
The standard HDMI port was replaced with two micro-HDMI ports, enabling dual-display support at resolutions up to 4Kp60.
It is important to distinguish between a (specs), a Datasheet (electrical characteristics of specific chips), and a Schematic (the actual wiring diagram). The official Raspberry Pi schematics show the physical layout of signals like HDMI, USB, Ethernet, and GPIO, as well as the intricate power distribution networks and clock routing.
