STMicroelectronics STM32F042G4U6

Overview

STM32F042G4U6 from STMicroelectronics is a 32-bit ARM Cortex-M0 microcontroller with 16 KB Flash, 6 KB SRAM, crystal-less USB 2.0 FS interface, CAN 2.0B controller, and 12-bit ADC (1.0 µs conversion). It operates from 2.0–3.6 V and supports up to 48 MHz CPU frequency. Used in embedded industrial control nodes requiring integrated USB device connectivity and robust analog sensing.

For engineers reviewing the STM32F042G4U6 datasheet, STM32F042G4U6 pinout, STM32F042G4U6 application, or STM32F042G4U6 equivalent, key selection criteria include USB clocking autonomy (48 MHz internal oscillator with trimming), CAN+USB coexistence on a single chip, 5 V-tolerant I/O count (up to 24), and capacitive touch channel support (up to 14 channels) for HMI cost optimization.

Technical Context

The STM32F042G4U6 integrates a single-cycle ARM Cortex-M0 core with NVIC supporting 32 interrupts, a dedicated CRS peripheral for USB clock synchronization without external crystal, and a hardware CRC unit for firmware integrity verification. Its clock tree includes dual oscillators: 48 MHz HSI48 (auto-trimmed via USB SOF) and 32 kHz LSE for RTC calibration.

Power architecture features three independent supply domains: VDD (digital/I/O), VDDA (analog, 2.4–3.6 V), and VDDIO2 (selectable I/O bank at 1.65–3.6 V). Low-power modes-Stop (1.9 µA typical) and Standby (0.3 µA)-are managed by PVD and ultra-low-leakage reset circuitry, enabling battery-backed operation with RTC alarm wakeup.

Key Specifications

Pinout & Package

STM32F042G4U6 is housed in a 28-pin UFQFPN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per ST's DocID025832 Rev 5, Section 4 (Pinouts and pin descriptions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32F042F4T6, the G4U6 trades I/O count and package size for compactness and lower assembly cost; versus STM32F070F6P6, it delivers unique crystal-less USB + CAN synergy critical for field-deployable diagnostic tools and industrial gateways.

Availability

STM32F042G4U6 is available at Aetrix Electronics and suitable for industrial sensor nodes, USB-capable HMI panels, automotive diagnostic tools, and smart power outlets requiring stable component supply across multi-year production cycles.

Supply support for STM32F042G4U6 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32F0 series targets cost-sensitive, resource-constrained embedded applications requiring ARM Cortex-M0 performance with rich analog/mixed-signal integration - optimized for rapid development and high-volume manufacturability.

FAQ

Does STM32F042G4U6 support USB device mode without an external crystal?

Yes. The device integrates an HSI48 oscillator with automatic trimming based on USB Start-of-Frame (SOF) tokens, enabling full-speed USB 2.0 device operation 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 STM32F042G4U6?

The STM32F042G4U6 is qualified for industrial temperature range: –40 °C to +85 °C ambient. This is specified in Section 6.3.1 (General operating conditions) and Table 21 of the datasheet, with thermal derating applied above 70 °C per package-specific θ_JA values in Table 74.

Can the 12-bit ADC perform simultaneous sampling on multiple channels?

No. The single 12-bit ADC supports sequential sampling only, with programmable channel sequencing via the regular channel sequence register (SQR). Simultaneous sampling requires dual ADCs or external parallel converters - a capability not present in the F042 series per Section 3.10 and Table 54 of the datasheet.

Is the UFQFPN28 package of STM32F042G4U6 lead-free and RoHS-compliant?

Yes. The UFQFPN28 package uses lead-free solderable terminations and complies with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. This is documented in ST's ECOPACK®2 environmental compliance statement referenced in the datasheet's "Features" section and Table 72 (UFQFPN28 mechanical data).