STM32F301K8T6 ST Mainstream Arm Cortex-M4 Mixed-Signal 32-bit MCU 64KB Flash 72MHz FPU ADC DAC Op-Amp LQFP-32

STM32F301K8T6 Product Overview

The STM32F301K8T6 is a Cortex-M4 mixed-signal MCU from STMicroelectronics in an LQFP-32 package. It runs at 72 MHz with FPU and ART Accelerator. It integrates 64 KB Flash, 16 KB SRAM, 12-bit ADC (8ch, 0.2µs), 12-bit DAC, 3 ultra-fast comparators (25ns), 3 programmable op-amps (PGA), up to 9 timers (incl. 1 motor control PWM/deadtime), and up to 11 communication interfaces (3×USART/1×UART/2×SPI/I2S/I2C). 26 I/Os, all 5 V-tolerant. Supply 2.0–3.6 V, -40–85 °C. Core specs are identical to the STM32F301C8T6 (LQFP-48, 37 I/Os), but in an LQFP-32 package with 26 I/Os and no USB, making it ideal for space-constrained mixed-signal applications. Compared to the STM32F103C8T6 (Cortex-M3), it upgrades to a Cortex-M4 core with FPU, adds op-amps and ultra-fast comparators for digital power and motor control.

STM32F301K8T6 Core Features

Core: Arm Cortex-M4 72 MHz + FPU + ART Accelerator Memory: 64 KB Flash, 16 KB SRAM 12-bit ADC: 8 channels, 0.2 µs, 0–3.6 V 12-bit DAC: 1 channel, buffered 3 Ultra-Fast Comparators: 25 ns 3 Programmable Op-Amps (PGA): Gain ×2/×4/×8/×16 Timers: 1× motor control PWM (deadtime/emergency stop), 3× 16-bit GP, 1× 32-bit GP, 2× watchdogs, SysTick Communication Interfaces: 3×USART + 1×UART (ISO7816/LIN/IrDA), 2×SPI/I2S, I2C (SMBus) I/Os: 26, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Package: LQFP-32 (7×7 mm)

STM32F301K8T6 Applications

Digital Power: SMPS, inverters, PFC Motor Control: BLDC/PMSM FOC, fans, pumps Consumer: Game controllers, remote controls IoT Nodes Sensor Signal Conditioning

STM32F301K8T6 Key Advantages

Cortex-M4 + FPU + Op-Amps/Comparators: High mixed-signal integration for digital power and motor control LQFP-32 Compact Package: 26 I/Os, ideal for space-constrained designs 72 MHz FPU: Single-cycle DSP and floating-point operations 3 PGAs + 3 25ns Comparators: No external op-amps needed, saves BOM ADC 0.2 µs Fast Conversion Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL

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FAQ:

1. What is the STM32F301K8T6 and how does it differ from the STM32F301K8U6?
   The STM32F301K8T6 is a 72 MHz Arm Cortex‑M4F microcontroller with 64 KB Flash and 16 KB SRAM in an LQFP‑32 package. It offers the same analog and digital peripherals as the K8U6: one 2 Msps 12‑bit ADC, one 12‑bit DAC, one operational amplifier, and one comparator. The only difference is the package—the K8T6 uses an LQFP‑32 with exposed leads and a 0.8 mm pitch, while the K8U6 uses a leadless UFQFPN‑32. The LQFP version is far easier to hand‑solder, inspect, and rework, making it the preferred choice for prototypes, small‑batch production, and designs where field repairability matters.

2. Why choose the LQFP‑32 K8T6 over the UFQFPN‑32 K8U6 when both are STM32F301?
   The LQFP‑32 package has exposed leads that can be drag‑soldered with a standard iron and flux, and every joint can be visually inspected. The UFQFPN‑32 is a leadless QFN‑style package that requires hot‑air or reflow soldering and is harder to rework. If you are building a few prototypes, a small batch, or a product that may need field repairs, the K8T6’s LQFP package saves time and reduces assembly risk. Electrically and functionally, the two are identical.

3. Can 64 KB Flash and 16 KB SRAM handle a real‑time control loop with sensor conditioning?
   Absolutely. A dedicated control algorithm (such as a PID loop, simple FOC, or digital power control) and sensor‑signal processing can comfortably fit within 64 KB of Flash. The 16 KB SRAM is sufficient for the real‑time stack, measurement buffers, and application variables. This configuration is very common in single‑purpose industrial nodes, portable instruments, and cost‑sensitive products where code size is well‑known and optimized.

4. How can the built‑in operational amplifier and comparator simplify my design?
   The integrated rail‑to‑rail op‑amp can amplify a shunt‑resistor voltage for current measurement or condition sensor signals, removing the need for an external amplifier IC. The fast analog comparator provides hardware cycle‑by‑cycle over‑current protection or zero‑crossing detection without extra components. In the compact 32‑pin LQFP, this integration saves board space and BOM cost, especially valuable when every square millimeter counts.

5. Why doesn't the STM32F301K8T6 have CAN or USB? What are my communication options?
   The F301 series intentionally omits CAN and USB to offer the lowest possible cost for applications that do not need fieldbus or USB connectivity. You still have up to 2× USART, 2× SPI, and 2× I2C interfaces, which are enough for connecting to sensors, displays, or wireless modules. If your design absolutely requires CAN or USB, the pin‑compatible STM32F302K8T6 (LQFP‑32) adds both while keeping the same analog front‑end.

6. How does the STM32F301K8T6 compare to the classic STM32F103C8T6 as an upgrade?
   The STM32F103C8T6 is a Cortex‑M3 with a 1 Msps ADC and no FPU. The F301K8T6 adds a single‑precision FPU, DSP instructions, a faster 2 Msps ADC, a DAC, an integrated op‑amp, and a comparator, all while keeping the same 64 KB Flash and a similar 32‑pin LQFP footprint. The pin‑out can often be made compatible with minor adjustments, giving a smooth hardware upgrade that dramatically improves control‑loop performance and analog precision without increasing board size.

7. When should I pick the STM32F301K8T6 over the STM32F302K8T6? What do I sacrifice?
   Choose the F301K8T6 when you do not need CAN or USB, and a 2 Msps ADC is fast enough for your application. You sacrifice the faster 5 Msps ADC, the second op‑amp, the additional comparator, and the CAN/USB peripherals. In return, you get the lowest‑cost Cortex‑M4F with an integrated op‑amp and DAC in a hand‑solderable LQFP‑32 package—ideal for high‑volume, cost‑sensitive products where every cent counts.

8. Does the STM32F301K8T6 have CCM (Core Coupled Memory)? How should I manage the SRAM?
   No, the 16 KB SRAM is a single unified block without a dedicated CCM. For real‑time performance, you can place your stack and time‑critical variables in the lower‑latency region of the SRAM. The entire SRAM is accessible by both the CPU and DMA without restrictions, which simplifies memory management and is perfectly adequate for most single‑loop control applications.

9. How fast is the single ADC on the STM32F301K8T6, and can it be used for motor control?
   The 12‑bit ADC samples at up to 2 Msps and supports up to 10 external channels. While not as fast as the 5 Msps ADCs on the F302/F303, 2 Msps is still sufficient for many single‑axis drives (e.g., sensored BLDC, stepper motors) and digital power converters at moderate switching frequencies. The ADC is tightly coupled to the advanced‑control timer, enabling automatic triggering with zero CPU overhead.

10. What development tools and libraries support the STM32F301K8T6?
    All major IDEs—free STM32CubeIDE, Keil MDK, and IAR EWARM—fully support the chip. The STM32CubeF3 firmware package provides HAL/LL drivers and examples for the ADC, DAC, op‑amp, and comparator. For evaluation, you can start with a NUCLEO‑F302R8 board (software‑compatible) and then migrate to the K8T6 by adjusting the linker script and pin‑out in CubeMX.