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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersSTM32F101C4T6A
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STM32F101C4T6A - STMicroelectronics

Manufacturer Part Number
STM32F101C4T6A
Manufacturer
STMicroelectronics
Allelco Part Number
32D-STM32F101C4T6A
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
13,733 pcs available, New & Original
Parts Description
IC MCU 32BIT 16KB FLASH 48LQFP
Package
48-LQFP (7x7)
Data sheet
STM32F101C4T6A.pdf

PCN Packaging

2.73KHz.pdf

PCN Assembly/Origin

STM8/STM32 10/Mar/2020.pdf
RoHs Status
ROHS3 Compliant
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Specifications

STM32F101C4T6A Tech Specifications
STMicroelectronics - STM32F101C4T6A technical specifications, attributes, parameters and parts with similar specifications to STMicroelectronics - STM32F101C4T6A

Product Attribute Attribute Value
Manufacturer STMicroelectronics
Voltage - Supply (Vcc/Vdd) 2V ~ 3.6V
Supplier Device Package 48-LQFP (7x7)
Speed 36MHz
Series STM32F1
RAM Size 4K x 8
Program Memory Type FLASH
Program Memory Size 16KB (16K x 8)
Peripherals DMA, PDR, POR, PVD, PWM, Temp Sensor, WDT
Package / Case 48-LQFP
Package Tray
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Number of I/O 37
Mounting Type Surface Mount
EEPROM Size -
Data Converters A/D 10x12b
Core Size 32-Bit Single-Core
Core Processor ARM® Cortex®-M3
Connectivity I²C, IrDA, LINbus, SPI, UART/USART
Base Product Number STM32F101

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status REACH Unaffected
ECCN 3A991A2
HTSUS 8542.31.0001

Parts Introduction

STM32F101C4T6A Image
STM32F101C4T6A (1)

Manufacturer Part Number

STM32F101C4T6A

Manufacturer

STMicroelectronics

Introduction

Highly integrated, 32-bit ARM Cortex-M3 MCU with extensive connectivity and peripherals

Product Features and Performance

32-bit ARM Cortex-M3 core operating at up to 36 MHz

16 KB of Flash memory, 4 KB of SRAM

10-bit, 12-channel ADC

Multiple communication interfaces (UART, SPI, IrDA, LIN)

DMA, PWM, temperature sensor, watchdog timer

Extensive set of I/O and peripherals

Product Advantages

Powerful 32-bit ARM Cortex-M3 core with advanced features

Flexible connectivity options for various applications

Extensive set of on-chip peripherals for enhanced functionality

Wide operating temperature range of -40°C to 85°C

RoHS3 compliant

Key Technical Parameters

ARM Cortex-M3 core at up to 36 MHz

16 KB Flash, 4 KB SRAM

10-bit, 12-channel ADC

37 I/O pins

Operating voltage range: 2V to 3.6V

-40°C to 85°C operating temperature range

Quality and Safety Features

RoHS3 compliant

Robust design for reliable operation

Compatibility

Compatible with a wide range of STM32 development tools and ecosystems

Application Areas

Embedded systems, industrial control, home automation, and other applications requiring a powerful, versatile MCU

Product Lifecycle

Current product, no discontinuation planned

Replacements and upgrades available within the STM32 MCU family

Several Key Reasons to Choose This Product

Powerful 32-bit ARM Cortex-M3 core for advanced performance

Extensive set of on-chip peripherals and connectivity options

Wide operating temperature range for demanding environments

Robust design and RoHS3 compliance for reliable operation

Compatibility with a well-established STM32 ecosystem

Frequently Asked Questions(FAQ)

How does the STM32F101C4T6A compare to higher-memory variants like the STM32F101C8T6 in typical microcontroller applications?
The STM32F101C4T6A provides 16KB of flash memory and 4KB of RAM, making it suitable for simple control tasks with limited data logging or small state machines. In contrast, the STM32F101C8T6 offers 64KB of flash and typically 8KB of RAM, allowing for more complex firmware features such as multiple peripheral drivers, larger lookup tables, or basic RTOS usage. Designers choosing between these variants must assess firmware complexity against available memory, as exceeding program size limits leads to linker errors, while insufficient RAM impacts real-time response during interrupts or buffer operations.
What considerations apply when using the STM32F101C4T6A in low-power battery-operated systems?
With a supply voltage range of 2V to 3.6V and internal oscillator operation, the STM32F101C4T6A supports moderate power efficiency, but its 36MHz maximum frequency and lack of ultra-low-power modes (unlike newer STM32L series) limit deep sleep savings. Engineers should disable unused peripherals, configure clocks carefully, and use stop or standby modes only if wake-up latency tolerances permit. Given the 4K×8 RAM retention in low-power states, data integrity during transitions remains critical.
Can the STM32F101C4T6A drive multiple I2C buses simultaneously without bus contention issues?
Yes, the STM32F101C4T6A includes hardware I2C peripherals that can operate on different pins, provided timing constraints are met and arbitration logic is respected. However, since only one I2C instance is listed in the connectivity summary, simultaneous multi-master communication requires external buffering or careful software coordination. Bus speed selection must also align with pull-up resistor values and cable capacitance to avoid signal integrity degradation.
What are the thermal implications of operating the STM32F101C4T6A at full 36MHz load in compact enclosures?
At 36MHz under heavy computational load, the device may dissipate several hundred milliwatts depending on VDD and switching activity. In a 48-LQFP package with limited exposed pad options, localized heating could approach 85°C ambient conditions. Engineers should verify thermal performance through worst-case simulations or prototypes, especially when stacking components on PCBs with high thermal resistance. Adequate airflow or thermal vias may be necessary for sustained operation near temperature limits.
How does the internal oscillator accuracy of the STM32F101C4T6A affect UART baud rate generation?
The internal RC oscillator typically has ±2% to ±5% tolerance across temperature and voltage variations. This drift directly impacts UART baud rate accuracy, potentially causing framing errors in high-speed serial links. For reliable communication over 9600 bps or higher, external crystal oscillators are recommended. If using the internal clock, engineers must validate baud rate margins at minimum and maximum operating conditions and consider adding error-handling routines in firmware.
Is it feasible to run an RTOS like FreeRTOS on the STM32F101C4T6A for task scheduling?
Technically possible, but constrained by resource limits. With only 16KB of flash and 4KB of RAM, only a minimal RTOS configuration with few tasks and reduced stack allocations would fit. Memory fragmentation and context switch overhead must be carefully managed. Real-time responsiveness depends on interrupt prioritization and peripheral DMA usage to offload CPU tasks. Most production designs opt for cooperative multitasking or single-threaded state machines instead.
What design precautions are needed when connecting the STM32F101C4T6A’s analog inputs to sensor outputs?
The STM32F101C4T6A features 10-bit ADCs with 12 effective bits of resolution in some cases, but input voltage must stay within VDD + 0.3V to avoid latch-up. Impedance matching and anti-aliasing filters are essential when sampling dynamic signals above 10 kHz. Since there is no built-in PGA, weak signal sources require external amplification. Sampling time configuration and ADC calibration routines significantly influence conversion accuracy, particularly at lower input voltages.
Can the STM32F101C4T6A support CAN bus communication without additional transceivers?
No, the STM32F101C4T6A does not include a CAN controller; its listed connectivity includes LINbus and IrDA but excludes CAN. To implement CAN communication, an external transceiver such as the MCP2551 must be added, along with proper termination resistors and differential signaling traces. PCB layout near the MCU pins must maintain controlled impedance to prevent EMI and ensure signal fidelity.
How does flash write endurance impact long-term reliability in STM32F101C4T6A-based systems?
According to STMicroelectronics specifications, the STM32F101C4T6A flash memory typically withstands 10,000 write cycles per sector. Frequent rewrites—such as storing runtime logs or calibration data—can degrade reliability over time. Best practice involves buffering writes in RAM and flushing them periodically, or using EEPROM emulation techniques with wear leveling. Avoiding repeated writes to the same addresses extends operational lifespan and maintains data integrity.
What trade-offs exist between using internal versus external clock sources with the STM32F101C4T6A?
The internal oscillator simplifies PCB design and reduces component count, enabling faster time-to-market, but sacrifices precision and stability. External crystals provide better timing accuracy and jitter characteristics, crucial for communication protocols and synchronous operations. However, they add cost, board space, and sensitivity to load capacitance mismatches. Engineers must balance system requirements against development constraints when selecting clock architecture.
Does the STM32F101C4T6A support USB OTG functionality?
No, the STM32F101C4T6A lacks USB hardware peripherals. While some STM32F1 series devices include USB, this specific model does not list it among its connectivity options. Implementing USB would require either upgrading to a derivative like the STM32F103 with USB support or using external USB-to-serial bridges for host or device mode communication.
How should interrupt handling be optimized on the STM32F101C4T6A given its limited RAM?
Interrupt service routines (ISRs) should be kept short to preserve stack depth and avoid overflow. Global variables accessed by ISRs must be declared volatile and accessed atomically where possible. Using DMA for data transfers reduces CPU load and minimizes interrupt frequency. Prioritizing critical interrupts via NVIC settings ensures timely responses, while non-essential processing should occur in main loop tasks. Excessive nesting of interrupts increases risk of missed deadlines due to priority inversion.
What precautions are necessary when soldering the STM32F101C4T6A in volume manufacturing?
As an LQFP-48 package with MSL 3 rating, the STM32F101C4T6A requires storage below 30°C and 60% RH before reflow. Solder paste selection should match lead-free processes with appropriate reflow profiles to avoid tombstoning or cold joints. Automated optical inspection (AOI) helps detect misalignments or solder defects. Thermal profiling ensures peak temperatures stay within JEDEC standards, preserving bond wire integrity and preventing latent reliability failures.
How does the absence of brown-out reset (BOR) thresholds affect system robustness in the STM32F101C4T6A?
The STM32F101C4T6A includes Power-on Reset (POR), Power-Down Detection (PDR), and Programmable Voltage Detector (PVD), but BOR behavior varies by variant. Without explicit BOR, undervoltage events may leave the MCU in undefined states. Designers should enable PVD with appropriate thresholds and implement software checks on startup. Monitoring supply rails with external comparators adds redundancy for safety-critical applications requiring fail-safe operation.
What limitations arise from the STM32F101C4T6A’s lack of dual-bank flash architecture?
Unlike some newer STM32 families, the STM32F101C4T6A uses single-bank flash, meaning all code resides in one memory region. This prevents in-application programming (IAP) updates without erasing the entire bank, which is impractical for large programs. Firmware upgrades must occur via external bootloader or JTAG/SWD flashing, increasing deployment complexity. Bootloader placement must avoid protected sectors to allow reprogramming capability.
How do pin assignments differ between LQFP-48 and other packages for the STM32F101C4T6A?
Although the STM32F101C4T6A is specified only in 48-LQFP (7x7), earlier derivatives appear in LQFP-32 and UFQFPN-32. Pin compatibility across packages is not guaranteed due to differing I/O counts and alternate function mappings. Engineers must consult exact part numbers and reference manuals, as critical peripherals like USART or SPI may map to different pins depending on package. Signal integrity and trace routing also vary with pad geometry.
Can the STM32F101C4T6A interface directly with 5V logic levels without level shifting?
No, the STM32F101C4T6A operates at 2V–3.6V logic levels. Applying 5V signals risks damaging input protection diodes and exceeding absolute maximum ratings. Direct connection to 5V systems requires bidirectional level translators or open-drain configurations with pull-down resistors. Alternatively, configuring I/Os as inputs only and using resistive dividers can work for unidirectional signals, though timing margins and noise immunity become concerns.
What role does the watchdog timer play in ensuring reliability in embedded systems using the STM32F101C4T6A?
The STM32F101C4T6A includes an independent window watchdog (IWDG) and low-voltage reset (LVR), both crucial for detecting software hangs caused by stack overflows or infinite loops. The IWDG runs from a dedicated 40kHz RC oscillator, making it immune to system clock failures. Engineers should initialize it early and periodically refresh it from safe code paths. Failure to service the watchdog triggers a hard reset, restoring predictable operation.

Parts with Similar Specifications

The three parts on the right have similar specifications to STMicroelectronics STM32F101C4T6A

Product Attribute STM32F101C6T6ATR STM32F101C6T6A STM32F101C8T6 STM32F101C6T6
Part Number STM32F101C6T6ATR STM32F101C6T6A STM32F101C8T6 STM32F101C6T6
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Peripherals - - - -
Voltage - Supply (Vcc/Vdd) - - - -
Core Processor - - - -
Connectivity - - - -
EEPROM Size - - - -
Oscillator Type - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Program Memory Size - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Number of I/O - - - -
Series - - - -
Program Memory Type - - - -
Core Size - - - -
Speed - - - -
RAM Size - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Data Converters - - - -

STM32F101C4T6A Datasheet PDF

Download STM32F101C4T6A pdf datasheets and STMicroelectronics documentation for STM32F101C4T6A - STMicroelectronics.

HTML Datasheet
STM32F101x(4,6) Datasheet.pdf
PCN Design/Specification
LQFP 48 7x7 Products Increased Capacity 21/Dec/201.pdf Mult Dev 03/Nov/2022.pdf
PCN Packaging
2.73KHz.pdf
PCN Assembly/Origin
STM8/STM32 10/Mar/2020.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

  • Daic***K.
    Mar 23, 2026

    Very good. No issue after long time testing.

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STM32F101C4T6A Image

STM32F101C4T6A

STMicroelectronics
32D-STM32F101C4T6A

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