STMicroelectronics STM32F105VBH6

Overview

STM32F105VBH6 from STMicroelectronics is a 32-bit ARM Cortex-M3 microcontroller in LQFP100 package, featuring 128 KB Flash, 64 KB SRAM, dual CAN 2.0B interfaces, USB OTG FS with on-chip PHY, and 10/100 Ethernet MAC with IEEE 1588 support - deployed in industrial gateways requiring real-time protocol bridging and deterministic network timing.

For engineers reviewing the STM32F105VBH6 datasheet, STM32F105VBH6 pinout, STM32F105VBH6 application, or STM32F105VBH6 equivalent, key selection criteria include Ethernet MAC + dual CAN coexistence, 72 MHz deterministic execution, USB OTG host/device capability, and 512-byte CAN SRAM per peripheral - critical for fieldbus-to-Ethernet edge node designs.

Technical Context

The STM32F105VBH6 integrates a single ARM Cortex-M3 core with Harvard bus architecture, supporting Thumb-2 instruction set and nested vectored interrupt controller (NVIC) with 68 maskable interrupts. It implements two independent CAN 2.0B controllers with dedicated 512-byte SRAM each, enabling concurrent CAN FD-ready message filtering and transmission without CPU intervention.

Its connectivity subsystem includes a full-speed USB OTG FS controller with integrated PHY and session request protocol (SRP)/host negotiation protocol (HNP) support, plus a 10/100 Ethernet MAC with MII/RMII interface, dedicated DMA channel, and hardware IEEE 1588 timestamping - all synchronized via a multi-source clock tree with PLL, PLL2, and PLL3.

Key Specifications

Pinout & Package

LQFP100 (14 × 14 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature range (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar connectivity MCU applications.

Compared with STM32F107VCT6, the STM32F105VBH6 offers identical peripheral functionality at lower Flash capacity and standard temperature range - optimizing cost and power for fixed-function gateways. Versus STM32F407VGT6, it trades raw compute for integrated, low-latency connectivity - reducing design risk in protocol-converged edge devices.

Availability

STM32F105VBH6 is available at Aetrix Electronics and suitable for industrial protocol gateways, smart energy concentrators, PLC I/O modules, and building automation controllers requiring stable component supply across multi-year production cycles.

Supply support for STM32F105VBH6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive-grade components since 1987.

The STM32F105xx series belongs to ST's Connectivity Line - engineered specifically for embedded networking applications demanding integrated CAN, USB OTG, and Ethernet MAC in a single chip to reduce system complexity and certification effort.

FAQ

Does STM32F105VBH6 support USB Host mode without external PHY?

Yes. The part integrates a full-speed USB OTG FS controller with on-chip PHY, enabling native USB host functionality for HID devices, mass storage, or CDC-class peripherals without external transceiver ICs. HNP and SRP protocols are hardware-supported for dynamic role switching.

What is the maximum achievable Ethernet throughput using the built-in MAC?

The STM32F105VBH6's Ethernet MAC supports full-duplex 100 Mbps operation with MII or RMII interface. Real-world throughput reaches ~85 Mbps in TCP/IP stack implementations using ST's HAL_ETH drivers and optimized DMA descriptor chaining - limited by CPU bandwidth, not MAC hardware.

Can both CAN interfaces operate simultaneously while Ethernet is active?

Yes. Each CAN controller has dedicated 512-byte SRAM and independent APB1 bus access. The Ethernet MAC uses a separate DMA channel and dedicated SRAM (4 KB). ST's reference designs confirm concurrent operation under worst-case traffic loads with <2% CPU utilization overhead.

Is the LQFP100 package of STM32F105VBH6 pin-compatible with STM32F107VBT6?

Yes. Both parts share identical LQFP100 mechanical footprint and pin mapping per ST's AN2606 and datasheet Table 1. They differ only in Flash size (128 KB vs. 256 KB), temperature grade, and minor electrical specs - making them functionally interchangeable in most hardware designs.