Item specifics
Description
STM32H7B0RBT6 Product Overview
STM32H7B0RBT6 is a Cortex-M7 MCU at 280 MHz with double-precision FPU, LQFP-64. 128 KB Flash, 1.4 MB SRAM, USB OTG HS/FS (on-chip HS PHY), Ethernet MAC, CAN FD, dual Quad SPI, FMC (SDRAM), three 16-bit ADCs (5 Msps), two 12-bit DACs, two comparators, HW crypto (AES/RNG/HASH), two SAI, SDIO, 8×USART/UART, 5×SPI/I2S, 4×I2C. Up to 51 x 5 V-tolerant I/Os. 1.62–3.6 V, -40–85 °C. Compared to the H7A3 series, optimizes cost with reduced Flash while preserving the full 1.4 MB SRAM and rich peripherals, making it an excellent value choice for high-performance embedded applications that execute code from external memory.
STM32H7B0RBT6 Core Features
Core: Cortex-M7 280 MHz, DPFPU + L1 cache (16 KB I-cache + 16 KB D-cache)
Memory: 128 KB Flash, 1.4 MB SRAM (including large contiguous SRAM blocks)
Connectivity: Ethernet MAC, USB OTG HS/FS (on-chip HS PHY), CAN FD, SDIO, 2×SAI, 8×USART/UART, 5×SPI/I2S, 4×I2C
Analog: 3×16-bit ADCs (5 Msps), 2×12-bit DACs, 2×Comparators
Security: Hardware AES/RNG/HASH crypto coprocessor
Memory Expansion: FMC (SDRAM/PSRAM/NOR/NAND), Dual Quad SPI
I/Os: Up to 51 (5 V-tolerant)
Package: LQFP-64
Temperature Range: -40°C to 85°C
STM32H7B0RBT6 Applications
Industrial Control: Real-time controllers, PLCs, servo drives, industrial Ethernet gateways
IoT & Security: Secure communication nodes, IoT gateways
High-Speed Communication: Ethernet/CAN FD/USB HS interface conversion and bridging
Audio & Consumer: Digital audio equipment, advanced consumer electronics
Graphics & Display: Display terminals with code executing from external Flash and large SRAM frame buffer
STM32H7B0RBT6 Key Advantages
280 MHz Cortex-M7 + DPFPU: Ultimate real-time processing and floating-point performance
1.4 MB Large SRAM: Same massive RAM as higher-end H7 models, ideal for data-intensive applications
On-Chip USB HS PHY: Eliminates external HS PHY, simplifying design and BOM
Ethernet + CAN FD + HW Crypto: Single-chip solution for industrial networking, real-time communication, and data security
Dual Quad SPI + FMC: Flexible external code/data memory expansion to complement internal Flash
51 I/Os in Compact 64-Pin Package: High-density interfaces for space-constrained high-performance designs
1.62–3.6 V Wide Supply: Adaptable to various power scenarios
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FAQ
1. How does the STM32H7B0RBT6 differ from the STM32H7B0VBT6, and what are the advantages of the LQFP‑64 package?
Both share the same Cortex‑M7 280 MHz core, 128 KB on‑chip Flash, 1.4 MB SRAM, Chrom‑ART accelerator, and all digital peripherals. The main differences lie in the package and I/O count: the RBT6 uses an LQFP‑64 package (10 mm × 10 mm) with 51 usable I/Os, while the VBT6 uses an LQFP‑100 package with 82 I/Os. The RBT6 is more compact, easy to hand‑solder, and ideal for space‑constrained designs with moderate I/O needs. If your system does not require more than 51 I/Os, the RBT6 delivers identical graphics performance and large SRAM capacity in a smaller footprint.
2. Why does the STM32H7B0RBT6 have only 128 KB of Flash but as much as 1.4 MB of SRAM?
This design concentrates cost on graphics processing and real‑time data throughput. The 128 KB Flash is primarily used for boot code and security‑critical firmware, while the massive 1.4 MB SRAM accommodates frame buffers, graphics assets, complex UI data, and real‑time control variables. The main application, large graphics libraries (such as TouchGFX), and file systems are stored in external Flash via the dual QSPI interfaces and executed through memory‑mapped mode, delivering real‑world performance very close to on‑chip Flash—an effective balance of high performance and cost.
3. Is the LQFP‑64 package easy to solder? Is it suitable for low‑volume hand assembly?
Very easy. The LQFP‑64 has all pins exposed with a 0.5 mm pitch and can be drag‑soldered with a standard iron and flux—no hot‑air station required. It strikes an excellent balance between mass production and hand prototyping, making it ideal for hobbyists, students, and small teams for rapid development and low‑volume production. The 10 mm × 10 mm size offers great compactness while remaining highly manageable.
4. With only 128 KB of on‑chip Flash, how are large applications executed, and is performance affected?
The 128 KB on‑chip Flash is mainly used for boot and secure loading. The main program, graphics assets, and file systems reside in external QSPI Flash, which can be memory‑mapped via the dual Quad SPI interfaces, allowing the CPU to fetch instructions directly. Combined with the large SRAM acting as a cache, sequential read throughput is very high, and real‑world execution efficiency closely approaches that of on‑chip Flash—easily meeting the demands of complex graphical interfaces and real‑time control.
5. How is the 1.4 MB SRAM organized, and how does it benefit graphics and real‑time tasks?
The 1.4 MB SRAM includes 192 KB of tightly coupled memory (TCM), with the remainder consisting of multi‑bank AXI SRAM and AHB SRAM. TCM provides zero‑wait‑state CPU access for the lowest and most deterministic interrupt and control‑loop latency. The large, multi‑bank design allows DMA and the CPU to access different memory regions simultaneously without blocking—critical when concurrently driving a high‑resolution LCD, handling Ethernet traffic, and performing high‑speed ADC acquisition, significantly boosting overall throughput.
6. Can the Chrom‑ART accelerator be fully utilized in the LQFP‑64 package, and what display size can be driven?
The Chrom‑ART (DMA2D) hardware accelerator does not consume extra I/Os, so its functionality is package‑independent. However, the on‑chip TFT‑LCD controller (LTDC) requires many pins for a 24‑bit RGB interface; in the 64‑pin package, bringing out a full interface would consume most of the I/Os and may limit other peripherals. You can still drive a 16‑bit display or use an SPI‑based smart screen to free up GPIOs. It is recommended to use STM32CubeMX for pin planning to balance graphics with other peripherals.
7. What external memory types can be connected via FMC and dual QSPI? Is SDRAM supported?
The Flexible Memory Controller (FMC) fully supports SDRAM, allowing tens of megabytes of runtime memory expansion, and can also interface with parallel NOR/NAND Flash. The dual Quad SPI interfaces support memory‑mapped mode and can connect high‑speed NOR Flash (up to 512 Mbit) or HyperRAM for code, graphics assets, and file systems. Within the 64‑pin package, you can bring out a 16‑bit SDRAM bus and both QSPI ports to build a highly flexible memory architecture for complex applications.
8. What high‑speed communication interfaces does the chip offer? Can Ethernet, USB HS, and CAN FD be used concurrently?
It integrates a 10/100M Ethernet MAC (with IEEE 1588), a USB 2.0 OTG high‑speed controller (480 Mbps), and up to three FDCAN controllers. All can operate simultaneously without conflicts and feature dedicated DMA. With the 51 available I/Os and careful pin‑multiplexing, you can bring out Ethernet RMII, USB HS ULPI, and at least one CAN FD channel simultaneously, but some trade‑offs may be necessary among other peripherals. It is recommended to use STM32CubeMX for upfront pin planning.
9. What about power consumption and thermal performance? Is the LQFP‑64 package reliable?
At 280 MHz full load, power consumption is typically around 1 W. Although the LQFP‑64 package lacks an exposed thermal pad, effective heat dissipation can be achieved through a large ground copper pour under the chip, a multi‑layer PCB, and sufficient thermal vias—no external heatsink is required. The chip supports dynamic frequency scaling and multiple low‑power modes, significantly reducing power during idle periods. It is rated for the commercial temperature range (0 °C–85 °C), and with good thermal design, long‑term stable operation can be maintained.
10. Is the software toolchain for the STM32H7B0RBT6 mature? Can I reuse code from previous projects?
Very mature. It is fully compatible with the STM32Cube ecosystem, including the free STM32CubeMX graphical configuration tool, STM32CubeIDE integrated development environment, and the feature‑rich STM32CubeH7 firmware package. If you have previously developed on STM32F4, F7, or other H7 projects, a large portion of HAL code can be reused; the main adjustments involve peripheral configuration, memory mapping, and external QSPI Flash initialization. ST also provides extensive example projects and middleware covering Ethernet, USB, graphics, and file systems.