STM32F078CBU6 — STM32F0 32-bit MCU, 128KB Flash, 48MHz, USB/LINbus, 48-UFQFN
STMicroelectronics STM32F0 series, STM32F078CBU6; ARM Cortex-M0 32-bit single-core at 48MHz, 128KB FLASH, 16KB RAM; 13x12-bit A/D and 2x12-bit D/A converters; USB, UART/USART, I2C, SPI, LINbus, HDMI-CEC; supply 1.65V to 3.6V; operating -40°C to 85°C; 48-UFQFN (7x7) exposed pad, surface mount, tray.
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Specifications
| Parameter | Value |
|---|---|
| Series | STM32F0 |
| Mounting type | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 1.65V ~ 3.6V |
| Operating temperature | -40°C ~ 85°C (TA) |
| Speed | 48MHz |
| Package | Tray |
| RAM size | 16K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | DMA, I²S, POR, PWM, WDT |
| Connectivity | HDMI-CEC, I²C, IrDA, LINbus, SPI, UART/USART, USB |
| Number of i (O) | 36 |
| Core processor | ARM® Cortex®-M0 |
| Case | 48-UFQFN Exposed Pad |
| Data converters | A/D 13x12b; D/A 2x12b |
| Program memory size | 128KB (128K x 8) |
Frequently asked questions
Does the -40°C to 85°C rating of the STM32F078CBU6 cover a sealed industrial enclosure running at 65°C internal ambient?
Yes — 65°C internal ambient against an 85°C maximum rating provides 20°C of margin, which is adequate for most passively ventilated or actively cooled sealed panels. The margin narrows if the enclosure has restricted airflow or if thermal relief vias under the exposed pad are absent from the board design; under those conditions the junction temperature can climb faster than the ambient rating suggests.
Can the STM32F078CBU6 drive a 0-10V industrial actuator directly from its internal DAC without external buffering?
No — the 2x12-bit DAC output range is tied to VDD, which runs at a maximum of 3.6V on this part. A 0-10V output requires a rail-to-rail op-amp buffer with level-shifting gain. The DAC can generate 0 to 3.3V natively at VDD = 3.3V, but 0-10V is outside the DAC's output range by design and cannot be achieved through firmware calibration alone.
Does the USB peripheral on the STM32F078CBU6 need an external LDO, or can VDD supply USB power directly?
VDD supplies the USB transceiver directly. When operating as a bus-powered USB device drawing up to 500mA, the board must provide a clean, regulated 3.3V rail with adequate bulk and decoupling capacitance — not raw VBUS. The internal USB PD controller shares the same supply domain. A dedicated LDO with appropriate headroom from the USB VBUS 5V rail is the standard implementation, not a direct VBUS-to-VDD connection.