STM32F042C6T6 - 48MHz Cortex-M0 32KB Flash USB MCU | STMicroelectronics
MPN: STM32F042C6T6 ✓ ActiveSTM32F042C6T6 Overview
A microcontroller integrates a CPU core, memory, and peripheral blocks into one semiconductor device. The STM32F0 family uses an Arm Cortex-M0 core within the broader 32-bit embedded microcontroller hierarchy, providing deterministic control performance, efficient interrupt handling, and a broad ecosystem of software development tools. The STM32F042C6T6 targets USB, CAN, industrial-control, consumer-electronics, and accessory applications.
The device operates from a 2.5 V or 3.3 V supply, as identified in the distributor listing. Its 48 MHz maximum operating frequency supports responsive control loops and USB full-speed device communication compliant with USB 2.0. The integrated USB device peripheral includes an internal USB PHY and embedded DP pull-up, while the datasheet summary identifies battery-charging detection support according to the Battery Charging Specification Revision 1.2.
The STM32F042x4/x6 family also provides a CAN peripheral, making the MCU appropriate for industrial and embedded communication systems. The 48-LQFP 7x7 mm package exposes the required GPIO, communication, power, debug, and clock connections in a widely manufacturable surface-mount format.
Typical uses include USB-connected configuration tools, data acquisition modules, compact industrial controllers, CAN-connected sensor nodes, and USB peripheral accessories. The 32 KB Flash capacity is appropriate for applications with moderate firmware size, while the 48 MHz core provides useful performance margin for protocol handling and real-time control.
Designers should confirm the exact pin multiplexing, crystal requirements, USB implementation guidance, and decoupling values against the manufacturer datasheet before layout. This page combines distributor availability data, manufacturer specifications, package information, and application guidance to support component selection and sourcing.
Drop-in alternatives for STM32F042C6T6 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STM32F042C6T6 (same form factor and footprint) — differing in Package, Core, Flash Memory, SRAM, ADC.
STM32F042C6T6
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →STM32F042C8T6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32F051C6T6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32F051C8T6
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →STM32F072C6T6
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
STM32F072C8T6
✅ Drop-In ⚠️ Specs UnverifiedContact for price
View Datasheet →STM32F042C6T6 Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M0, 32-bit RISC |
| Maximum CPU Frequency | 48 MHz |
| Flash Memory | 32 KB (32K x 8) |
| SRAM | 6 KB |
| Operating Supply Voltage | 2.5 V / 3.3 V |
| USB Interface | USB Full-Speed device, USB 2.0 |
| CAN Interface | CAN peripheral |
| Package | 48-LQFP (7x7 mm) |
| Mounting Type | Surface Mount |
| Product Range | STM32F0 Series |
| Core Architecture | ARM Cortex-M0 |
| Flash Organization | 32K x 8 |
| USB PHY | Internal USB PHY |
| USB DP Pull-Up | Embedded |
| Battery Charging Detection | Battery Charging Specification Revision 1.2 |
| MSL Level | 3 |
| RoHS Status | Compliant |
STM32F042C6T6 Pin Configuration
| Pin 1 | VBAT — Backup supply pin |
| Pin 2 | PC13 — General-purpose input/output |
| Pin 3 | PC14-OSC32_IN — General-purpose input/output or external oscillator input |
| Pin 4 | PC15-OSC32_OUT — General-purpose input/output or external oscillator output |
| Pin 5 | PF0-OSC_IN — General-purpose input/output or external oscillator input |
| Pin 6 | PF1-OSC_OUT — General-purpose input/output or external oscillator output |
| Pin 7 | NRST — Reset input |
| Pin 8 | VDDA — Analog power supply |
| Pin 9 | PA0 — General-purpose input/output or analog input |
| Pin 10 | PA1 — General-purpose input/output or analog input |
| Pin 11 | PA2 — General-purpose input/output or analog input |
| Pin 12 | PA3 — General-purpose input/output or analog input |
| Pin 13 | PA4 — General-purpose input/output or analog input |
| Pin 14 | PA5 — General-purpose input/output or analog input |
| Pin 15 | PA6 — General-purpose input/output or analog input |
| Pin 16 | PA7 — General-purpose input/output or analog input |
| Pin 17 | PB0 — General-purpose input/output or analog input |
| Pin 18 | PB1 — General-purpose input/output or analog input |
| Pin 19 | VSS — Ground |
| Pin 20 | VDD — Digital power supply |
| Pin 21 | PB2 — General-purpose input/output or BOOT1 |
| Pin 22 | PB10 — General-purpose input/output or alternate-function signal |
| Pin 23 | PB11 — General-purpose input/output or alternate-function signal |
| Pin 24 | VSS — Ground |
| Pin 25 | VDD — Digital power supply |
| Pin 26 | PB12 — General-purpose input/output or alternate-function signal |
| Pin 27 | PB13 — General-purpose input/output or alternate-function signal |
| Pin 28 | PB14 — General-purpose input/output or alternate-function signal |
| Pin 29 | PB15 — General-purpose input/output or alternate-function signal |
| Pin 30 | PA8 — General-purpose input/output or alternate-function signal |
| Pin 31 | PA9 — General-purpose input/output or alternate-function signal |
| Pin 32 | PA10 — General-purpose input/output or alternate-function signal |
| Pin 33 | PA11 — General-purpose input/output or USB/CAN alternate function |
| Pin 34 | PA12 — General-purpose input/output or USB alternate function |
| Pin 35 | PA13 — General-purpose input/output or debug signal |
| Pin 36 | VSS — Ground |
| Pin 37 | VDD — Digital power supply |
| Pin 38 | PA14 — General-purpose input/output or debug signal |
| Pin 39 | PA15 — General-purpose input/output or debug signal |
| Pin 40 | PB3 — General-purpose input/output or debug signal |
| Pin 41 | PB4 — General-purpose input/output or debug signal |
| Pin 42 | PB5 — General-purpose input/output or alternate-function signal |
| Pin 43 | PB6 — General-purpose input/output or alternate-function signal |
| Pin 44 | PB7 — General-purpose input/output or alternate-function signal |
| Pin 45 | BOOT0 — Boot mode selection input |
| Pin 46 | PB8 — General-purpose input/output or alternate-function signal |
| Pin 47 | PB9 — General-purpose input/output or alternate-function signal |
| Pin 48 | VSS — Ground |
Typical Applications
STM32F042C6T6 is suitable for 6 applications: USB Configuration and Programming Tool, USB-Peripheral Data Acquisition Module, CAN-Connected Industrial Sensor Node, USB-Accessory and Peripheral Controller, Battery-Powered Embedded Control Module, Consumer Electronics and Interface Controller.
USB Configuration and Programming Tool
The STM32F042C6T6 is suitable for a compact USB configuration adapter because it combines a 48 MHz Cortex-M0 core with a full-speed USB device peripheral and 32 KB of Flash. Its integrated USB PHY, embedded DP pull-up, and battery-charging detection support reduce the external interface burden. Place the MCU beside the USB connector, provide the datasheet-recommended decoupling, route D+ and D- as a controlled differential pair, and validate enumeration with the target host. The advantage over a simpler microcontroller is native USB support, although firmware size must remain within the 32 KB Flash budget.
Recommended
USB-Peripheral Data Acquisition Module
The STM32F042C6T6 fits a small USB data-acquisition module that must stream sensor or control data to a host computer. Its 48 MHz CPU provides timing margin for sampling control and packet handling, while the USB full-speed device peripheral handles enumeration and data transfer without an external USB controller. The 32 KB Flash capacity is adequate for a focused acquisition application, but buffered streaming code must be sized carefully. The designer should use the manufacturer USB application guidance, place the MCU and connector close together, and isolate analog and digital sections to reduce USB-related noise coupling.
Recommended
CAN-Connected Industrial Sensor Node
The STM32F042C6T6 is appropriate for a compact industrial sensor node requiring both CAN connectivity and USB service access. The manufacturer data identifies CAN support alongside the USB full-speed device peripheral, allowing one MCU to handle local sensing, remote bus communication, and a maintenance connection. Its 48 MHz Cortex-M0 execution rate supports interrupt-driven communication and control tasks, while the 6 KB SRAM limits the feasible buffering strategy. Use a bus transceiver, protection network, and isolated or filtered CAN interface, and follow the datasheet layout guidance for EMC-sensitive industrial equipment.
Recommended
USB-Accessory and Peripheral Controller
A low-cost USB accessory can use the STM32F042C6T6 as its central controller because the device combines USB device connectivity with general-purpose embedded control in a single 48-LQFP package. The 32 KB Flash is sufficient for bootloader plus application firmware in focused accessories, and the 48 MHz core leaves room for status LEDs, buttons, and local sensor handling. Compared with a higher-end Cortex-M device, the F042 offers a lower-complexity platform, but firmware partitioning is important if USB stacks, bootloaders, and application code coexist. Validate USB suspend, resume, and bus-powered current behavior during system qualification.
Recommended
Battery-Powered Embedded Control Module
The STM32F042C6T6 can serve as the controller in a small battery-powered module where USB is used for charging, configuration, or data exchange. Its 2.5 V or 3.3 V operating range supports common regulated rails, and the integrated USB battery-charging detection function simplifies implementation of a USB-connected power path. The Cortex-M0 core and 48 MHz clock provide adequate control performance without requiring a high-power application processor. Low-power design still depends on peripheral settings, clock configuration, and firmware sleep modes, so consult the manufacturer sleep-mode and brownout guidance rather than assuming USB operation is low power.
Recommended
Consumer Electronics and Interface Controller
The STM32F042C6T6 is appropriate for a compact consumer interface controller that manages USB connectivity, front-panel controls, and low-speed status signalling. Its 48 MHz Cortex-M0 core provides deterministic interrupt servicing, while 32 KB Flash and 6 KB SRAM fit many control-only products without an external memory device. The 48-LQFP package offers a practical balance between pin availability and board size. Designers should confirm the exact GPIO alternate functions, oscillator arrangements, and low-power requirements for the production enclosure, and should avoid using the USB-connected state as a substitute for a complete power-budget analysis.
Recommended
Recommended Products Summary
Engineering reference data for STM32F042C6T6 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32F042C8T6 | STM32F051C6T6 | STM32F051C8T6 | STM32F072C6T6 | STM32F072C8T6 |
|---|---|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) | 48-LQFP (7x7 mm) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Core | ARM Cortex-M0, 32-bit | ARM Cortex-M0, 32-bit | ARM Cortex-M0, 32-bit | ARM Cortex-M0, 32-bit | ARM Cortex-M0, 32-bit | ARM Cortex-M0, 32-bit |
| Maximum Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 32 KB | 64 KB | 32 KB | 64 KB | 32 KB | 64 KB |
| SRAM | 6 KB | 8 KB | 6 KB | 8 KB | 6 KB | 8 KB |
| Supply Voltage | 2.5 V / 3.3 V | 2.5 V / 3.3 V | 2.5 V / 3.3 V | 2.5 V / 3.3 V | 2.5 V / 3.3 V | 2.5 V / 3.3 V |
Key Differentiators
- Combines USB full-speed device support with CAN in one Cortex-M0 MCU (vs STM32F072C6T6)
- Lower flash capacity provides a defined 32 KB firmware target (vs STM32F042C8T6)
- 48 MHz Cortex-M0 performance with USB device connectivity (vs STM32F051C6T6)
- Established STM32F0 software and peripheral positioning (vs GD32F103)
Design Notes
Use the manufacturer datasheet power-supply and decoupling recommendations rather than treating the 2.5 V/3.3 V operating-voltage statement as a complete power design. Place supply capacitors close to the VDD and VDDA pins, route analog and digital returns according to the reference layout, and verify the regulator headroom required by the USB PHY and any external load. Estimated note: the actual dissipation and current draw depend on clock configuration, peripheral use, and USB activity, so no datasheet figure is inferred here.
Keep the USB D+ and D- routing short, impedance-controlled, and away from switching nodes and noisy analog inputs. Provide a continuous ground reference beneath the pair and place USB-related passive components close to their associated pins. For CAN, isolate the transceiver from the MCU side of the board and follow the transceiver manufacturer's termination and protection guidance. The MCU's 48-LQFP footprint leaves adequate escape routing, but pin multiplexing must be confirmed in the official pin table.
Do not assume that a family member with the same package is automatically firmware- or function-compatible. The STM32F042, STM32F051, and STM32F072 alternatives differ in Flash, SRAM, peripheral availability, and alternate-function behavior; validate boot configuration, interrupt mapping, USB descriptor support, and CAN implementation before release. Also check the exact ordering-code suffix, because tray and tape-and-reel packaging are separate procurement options even though the electrical device is the same.
Compliance Information
RoHS compliance is reported by the verified PartGenie result. Other compliance attributes were not explicitly provided in the verified data and are therefore marked unknown. AEC-Q100 qualification was not identified for this part.
