STM32F439BGT6 STMicroelectronics ARM Cortex-M4 MCU, 180MHz, 1MB Flash, 208-LQFP
STMicroelectronics STM32F4 series, ARM Cortex-M4 single-core MCU, 180MHz, 1MB Flash, 256KB SRAM, 168 I/O, 208-LQFP (28x28mm), tray; -40°C to 85°C, 1.8V to 3.6V supply; Ethernet, USB OTG, CAN, 24x12b ADC, 2x12b DAC.
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Specifications
| Parameter | Value |
|---|---|
| Series | STM32F4 |
| Mounting type | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 1.8V ~ 3.6V |
| Operating temperature | -40°C ~ 85°C (TA) |
| Speed | 180MHz |
| Package | Tray |
| RAM size | 256K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, DMA, I²S, LCD, POR, PWM, WDT |
| Connectivity | CANbus, EBI/EMI, Ethernet, I²C, IrDA, LINbus, SPI, UART/USART, USB OTG |
| Number of i (O) | 168 |
| Core processor | ARM® Cortex®-M4 |
| Case | 208-LQFP |
| Data converters | A/D 24x12b; D/A 2x12b |
| Program memory size | 1MB (1M x 8) |
Frequently asked questions
Can I substitute the STM32F439ZIT6 (144-pin) for the STM32F439BGT6 on my existing board?
No. The 208-lead LQFP package on the STM32F439BGT6 does not share a footprint with the 144-pin variant; the mounting hole pattern and board cutout require a respin. Pin-compatible substitutes with the same 208-lead body and full peripheral routing are not listed in this ledger.
Does the internal oscillator support USB OTG full-speed timing?
No. The internal RC oscillator does not meet the ±0.25% accuracy required for USB full-speed operation. USB OTG on the STM32F439BGT6 requires an external crystal on the HSE pins — typically 8MHz or 25MHz depending on your PLL configuration.
Does 256KB of SRAM leave headroom after Ethernet, USB OTG, and DMA buffers at 180MHz?
The raw allocation is 256KB, which is generous — but ETH MAC, USB OTG, and DMA channel buffers consume a meaningful slice at full bus speed. The usable free-SRAM figure after peripheral reservation depends on your firmware configuration and should be profiled with your actual driver stack loaded, not estimated from the headline number alone.