Raspberry Pi 4 Model B Full Schematic =link=

https://datasheets.raspberrypi.com/rpi4/raspberry-pi-4-reduced-schematics.pdf

VideoCore VI 3D Graphics supporting OpenGL ES 3.1 and Vulkan 1.0. 2. Power Delivery and Electrical Specifications

Because the official schematic often does not label component part numbers, the community has worked to identify the major ICs (Integrated Circuits) on the Pi 4B. If you are reading a schematic of the Pi 4 (or examining a physical board), here are the critical components you are looking at:

Unlike previous generations where the RAM was packaged directly on top of the CPU (Package-on-Package), the Pi 4 decouples them. The schematic shows a dedicated high-speed point-to-point bus connecting the BCM2711 to an external LPDDR4 SDRAM IC. Raspberry Pi 4 Model B Full Schematic

Included in the Schematic

The key takeaways are these:

When designing a HAT or add-on board, always reference the schematic for your specific use case to confirm the availability and alternate functions of each pin. https://datasheets

The BCM2711 features a quad-core ARM Cortex-A72 cluster running at 1.5 GHz (overclockable to 1.8 GHz or higher in newer revisions). In the schematic, this block is represented by massive ball grid array (BGA) pinouts divided into banks for power, ground, and specific signal groups. The Cortex-A72 implements out-of-order execution, giving it up to three times the performance of the Cortex-A53 found in the Pi 3B+. Memory Interface (LPDDR4)

Understanding the Pi 4's schematic empowers you in several real-world scenarios:

March 23, 2026

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

The schematic details the "SD_PWR_ON" signal and the 3.3V regulator feeding the SD card slot (J2). The card-detect pin is notably absent in implementation, as the Pi relies on software polling for card presence.