STMicroelectronics STM32F042G4U6TR

Overview

STM32F042G4U6TR from STMicroelectronics is an ARM® Cortex®-M0 32-bit microcontroller with 16 KB Flash, 6 KB SRAM, crystal-less USB 2.0 Full-Speed interface, CAN 2.0B controller, and integrated 48 MHz RC oscillator trimmed via USB SOF synchronization. It operates from 2.0–3.6 V, supports 38 fast I/Os (24 5 V-tolerant), and targets embedded control in industrial sensors, USB-connected peripherals, and CAN-based automation nodes.

For engineers reviewing the STM32F042G4U6TR datasheet, STM32F042G4U6TR pinout, STM32F042G4U6TR application, or STM32F042G4U6TR equivalent, key selection criteria include USB clocking autonomy (no external crystal required), CAN+USB coexistence on a single chip, low-power Stop/Standby modes with RTC wakeup, and capacitive touch sensing capability for HMI interfaces.

Technical Context

The device integrates a single-cycle Cortex-M0 core running up to 48 MHz, with tightly coupled NVIC, CRC unit, and memory protection unit (MPU). Its clock system combines internal oscillators - including a factory-trimmed 48 MHz HSI48 for USB - with optional 4–32 MHz HSE and 32 kHz LSE for RTC calibration.

Peripheral integration centers on real-time connectivity: one CAN 2.0B controller with dedicated TX/RX pins and filtering, full-speed USB 2.0 PHY with BCD/LPM support, two USARTs (one with ISO7816/LIN/IrDA), two SPIs (one multiplexed with I2S), and a 12-bit ADC with 10-channel sampling at 1.0 µs conversion time and independent analog supply (VDDA = 2.4–3.6 V).

Key Specifications

Pinout & Package

STM32F042G4U6TR is housed in a 28-pin UFQFPN package (4 × 4 mm, 0.5 mm pitch) with wettable flanks, optimized for automated optical inspection (AOI) and high-density PCB layouts. Pin functions are validated per ST's official pin definition table (DocID025832 Rev 5, Table 13).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F042K4T6, the STM32F042G4U6TR provides full USB+CAN coexistence in a compact 28-pin package; versus STM32F072CBT6, it offers lower cost and smaller footprint for cost-sensitive, interface-constrained applications where extended Flash or CAN FD is unnecessary.

Availability

STM32F042G4U6TR is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-connected peripherals, and CAN-based automation controllers requiring stable component supply across multi-year production cycles.

Supply support for STM32F042G4U6TR 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.

This part belongs to the STM32F0 mainstream Arm Cortex-M0 microcontroller family, engineered for cost-sensitive, resource-constrained embedded applications demanding USB connectivity, real-time control, and industrial interface support - especially where crystal-less operation and small form factor are critical.

FAQ

Does STM32F042G4U6TR require an external crystal for USB operation?

No. The device features an internal 48 MHz HSI48 oscillator with automatic trimming synchronized to USB Start-of-Frame (SOF) packets, achieving ±0.25% frequency accuracy without any external crystal or capacitors. This is confirmed in Section 3.6 and Table 40 of the official datasheet (DocID025832 Rev 5).

What is the maximum operating temperature range for this part?

The STM32F042G4U6TR is rated for industrial temperature range: –40 °C to +85 °C ambient, as specified in Section 6.3.1 and Table 21 of the datasheet. Thermal derating begins above 70 °C ambient when operating at maximum 48 MHz with all peripherals active.

Can the 5 V-tolerant I/Os be used with a 1.8 V supply on VDDIO2?

Yes - eight I/Os (PA0–PA7) support independent VDDIO2 supply from 1.65 V to 3.6 V. When VDDIO2 = 1.8 V, those pins operate at 1.8 V logic levels while remaining 5 V-tolerant on input, enabling direct interface with 1.8 V peripherals without level shifters, per Section 3.7 and Table 50.

Is the RTC battery-backed when VDD is removed?

Yes. The RTC and 4 backup registers retain state and continue counting using VBAT supply (1.8–3.6 V) when main VDD is disconnected, as detailed in Section 3.13 and Figure 12. VBAT must be connected externally (e.g., coin cell) and decoupled with ≥1 µF capacitor for reliable operation.