STM32F051K6T7 - 32KB Flash 48MHz Cortex-M0 MCU 32-LQFP | STMicroelectronics
MPN: STM32F051K6T7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.98 | $2.98 |
| 10 | $2.68 | $26.80 |
| 100 | $2.25 | $225.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.7 | $1,700.00 |
STM32F051K6T7 Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (typically Flash), working RAM, and a rich set of programmable peripherals onto one silicon die. The STM32F051 family belongs to the ARM Cortex-M0 class — the smallest, most energy-efficient member of the ARMv6-M architecture family — and STM32F0 series MCUs sit below the Cortex-M3/M4 STM32F1/F4 lines in ST's hierarchy. They are used as the 'brains' of embedded products, executing firmware that reads sensors, drives actuators, and communicates over serial buses.
Key features of the STM32F051K6T7 include 32KB of on-chip Flash (32K x 8), 8KB of SRAM, a 32KB single-bank Flash with read/write protection, and up to 25 fast 5V-tolerant GPIOs. The 48MHz Cortex-M0 core delivers 0.93 DMIPS/MHz and executes the Thumb instruction set, while the integrated 12-bit 1Msps ADC (up to 13 external channels), advanced-control timers, and motor-control PWM block address field-oriented control of small BLDC and stepper motors. Communication interfaces include I2C (Fast-mode Plus), SPI, I2S, USART, and an HDMI-CEC peripheral for consumer-electronics bridging.
On the architecture side, the part uses ST's 90nm embedded Flash process with a low-leakage option for run and standby modes, an internal 8MHz RC oscillator with PLL-derived 48MHz system clock, and an integrated voltage regulator supporting 2.0V–3.6V single-supply operation. An independent watchdog, a window watchdog, and a SysTick timer provide three-tier task supervision. The 12-bit ADC shares its sample-and-hold across the 16 input channels, and on-chip op-amps (on selected variants) allow direct current-shunt motor sensing without external amplifiers.
Typical applications include small BLDC and PMSM motor drives for fans, pumps and e-bikes, sub-1GHz and BLE sensor nodes, low-cost HMI boards, electronic metering, home appliances, and USB-CEC bridging accessories. The 32-LQFP footprint also suits hand-soldered prototypes and small-batch industrial modules where the larger 48/64-pin STM32F0 parts are not required.
When designing with the STM32F051K6T7, allocate at least 4KB of the 32KB Flash for a UART bootloader, and place a 100nF decoupling capacitor within 3mm of each VDD pin. The integrated reset and POR circuits require a 100nF cap on NRST; a 10kΩ pull-up ensures clean power-on behavior. For ADC accuracy, decouple VDDA separately from VDD and avoid routing high-frequency signals near the analog pins.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for STM32F051K6T7 — 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 STM32F051K6T7 (same form factor and footprint) — differing in Core Architecture, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STM32F051K6T6
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →STM32F031K6T6
✅ Drop-In📋 Reference alternative (not in catalog)
STM32F051K8T7
✅ Drop-In📋 Reference alternative (not in catalog)
STM32F051C6T6
✅ Drop-In📋 Reference alternative (not in catalog)
GD32F130K6T6
✅ Drop-In📋 Reference alternative (not in catalog)
MM32F031K6T6
✅ Drop-In📋 Reference alternative (not in catalog)
STM32F051K6T7 Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M0 32-bit RISC |
| CPU Frequency | 48 MHz |
| Instruction Set | Thumb / Thumb-2 subset |
| Performance | 0.93 DMIPS/MHz (38 DMIPS) |
| Flash Memory | 32 KB (32K x 8) |
| SRAM | 8 KB |
| Operating Voltage | 2.0 V to 3.6 V |
| I/O Voltage Tolerance | 5 V tolerant FT/FTf pins |
| Number of I/Os | 25 (high-current) |
| ADC | 12-bit, 1 Msps, up to 13 external channels |
| Timers | 1x 16-bit advanced-control, 5x 16-bit general-purpose, 1x 32-bit, 2x basic, SysTick, 2x watchdog |
| Communication | 1x I2C Fast-mode Plus, 1x SPI, 1x I2S, 1x USART, HDMI-CEC |
| Package | 32-LQFP (7x7 mm) |
| Operating Temperature | -40 C to +105 C (grade 7) |
| RoHS Status | Compliant (ecopack2) |
STM32F051K6T7 Pin Configuration
| Pin 1 | PB7 — I2C1_SDA / TIM17_CH1N |
| Pin 2 | PB8 — TIM16_CH1 / I2C1_SCL |
| Pin 3 | PB9 — I2C1_SDA / TIM17_CH1 |
| Pin 4 | VDD — Digital supply (2.0-3.6V) |
| Pin 5 | VSS — Digital ground |
| Pin 6 | OSC_IN — External clock input / HSE |
| Pin 7 | OSC_OUT — External clock output / HSE |
| Pin 8 | NRST — Reset input, active low |
| Pin 9 | VSSA — Analog ground |
| Pin 10 | VDDA — Analog supply (2.4-3.6V) |
| Pin 11 | PA0 — WKUP / ADC_IN0 / TIM2_CH1 |
| Pin 12 | PA1 — ADC_IN1 / TIM2_CH2 |
| Pin 13 | PA2 — USART1_TX / ADC_IN2 / TIM2_CH3 |
| Pin 14 | PA3 — USART1_RX / ADC_IN3 / TIM2_CH4 |
| Pin 15 | PA4 — SPI1_NSS / ADC_IN4 / TIM14_CH1 |
| Pin 16 | PA5 — SPI1_SCK / ADC_IN5 |
| Pin 17 | PA6 — SPI1_MISO / ADC_IN6 / TIM3_CH1 |
| Pin 18 | PA7 — SPI1_MOSI / ADC_IN7 / TIM3_CH2 |
| Pin 19 | PB0 — ADC_IN8 / TIM3_CH3 |
| Pin 20 | PB1 — ADC_IN9 / TIM3_CH4 |
| Pin 21 | PB2 — BOOT1 / I2C1_SMBA |
| Pin 22 | PB10 — I2C2_SCL / USART3_TX (on F0 family) |
| Pin 23 | PB11 — I2C2_SDA / USART3_RX (on F0 family) |
| Pin 24 | VSS — Digital ground |
| Pin 25 | VDD — Digital supply (2.0-3.6V) |
| Pin 26 | PB12 — SPI2_NSS / TIM1_BKIN |
| Pin 27 | PB13 — SPI2_SCK / TIM1_CH1N |
| Pin 28 | PB14 — SPI2_MISO / TIM1_CH2N |
| Pin 29 | PB15 — SPI2_MOSI / TIM1_CH3N |
| Pin 30 | PA8 — USART1_CK / TIM1_CH1 / MCO |
| Pin 31 | PA9 — USART1_TX / TIM1_CH2 / I2C1_SCL |
| Pin 32 | PA10 — USART1_RX / TIM1_CH3 / I2C1_SDA |
Typical Applications
STM32F051K6T7 is suitable for 6 applications: Low-Cost BLDC / PMSM Motor Control, Industrial IoT Sensor Node, Home Appliance Control Board, Electronic Metering and Energy Measurement, USB-CEC Bridging Accessory, Low-Cost HMI with Keypad and LCD.
Low-Cost BLDC / PMSM Motor Control
The STM32F051K6T7 fits small motor control boards because it combines a 48MHz Cortex-M0 core with a 16-bit advanced-control timer (TIM1) generating complementary 6-channel PWM, a 12-bit 1Msps ADC, and built-in 32KB Flash for ST's MCSDK reference firmware. In a typical sensorless 6-step or basic FOC drive for a 24V fan, pump or e-bike hub, the MCU's PWM channels feed the gate driver while the ADC samples the back-EMF at 5-20kHz - well within the 1Msps budget. Compared with an 8-bit AVR, the 32-bit core halves the control-loop latency and gives headroom for UART diagnostics, while the 32-LQFP footprint is hand-solderable and inexpensive.
Recommended
Industrial IoT Sensor Node
In a battery-powered IIoT sensor node, the STM32F051K6T7's 2.0-3.6V wide supply, 8KB SRAM, and 12-bit ADC read temperature, pressure or 4-20mA transducers at sub-mA currents. The 32KB Flash holds a LoRaWAN or Modbus stack plus application logic, while the I2C/SPI/USART set talks to radios and EEPROMs. Compared to discrete 8-bit designs, the part drops the BOM by 30-50% and adds a real Cortex-M ecosystem (HAL, FreeRTOS, STM32CubeMX). For remote deployments, the integrated low-power Run and Standby modes trim quiescent current below 5uA, extending coin-cell life by months.
Recommended
Home Appliance Control Board
The STM32F051K6T7 is widely deployed in washing machines, dishwashers, induction cookers, and air-conditioner boards because its 32-LQFP package, 25 GPIOs, and 5V-tolerant inputs interface directly to triac drivers, keypads and seven-segment LEDs without level shifters. The 16-bit advanced timer provides zero-crossing detection for TRIAC phase-angle control of heating elements, while the 12-bit ADC monitors NTC thermistors and current shunts. The wide 2.0-3.6V supply tolerates rectified 12V rails, and the 105C operating temperature grade (T7 suffix) suits appliance in-cabinet environments.
Recommended
Electronic Metering and Energy Measurement
Single-phase electricity meters, water meters, and gas meters frequently use the STM32F051K6T7 as the metrology host because the 12-bit 1Msps ADC samples current shunts and voltage dividers at 4kHz with adequate dynamic range for class-1 accuracy. The 32KB Flash holds IEC 62053-21 calibration tables, tamper detection, and an MBus or wireless M-Bus stack over USART. The 5V-tolerant GPIOs connect directly to opto-isolated pulse inputs, while the 32-LQFP package is small enough for the 50x60mm meter form factor. The internal 8kB SRAM buffers up to 30 days of 15-minute interval data.
Recommended
USB-CEC Bridging Accessory
The STM32F051K6T7 uniquely includes an HDMI-CEC hardware peripheral, which makes it the lowest-cost solution for HDMI-CEC bridges (TV to AVR, set-top box to TV). It translates between HDMI-CEC two-wire bus and UART/SPI bridges for downstream microcontrollers. The 32KB Flash stores CEC command tables, the 12-bit ADC is unused but available for power monitoring, and the small 32-LQFP package fits inside HDMI connector dongles. Compared with discrete CEC line drivers, an F051K6T7 plus one NPN transistor is the entire BOM.
Recommended
Low-Cost HMI with Keypad and LCD
HMI panels for elevators, coffee machines and industrial kiosks use the STM32F051K6T7 to scan 4x4 or 5x5 matrix keypads, drive character or graphic LCDs over SPI/I2C, and run menu logic. The 32KB Flash holds a small LVGL or character-based UI plus the keypad debounce state machine, and the 8KB SRAM buffers display frame regions. Five USART instances (on F0 family) handle RS-485 Modbus to the host PLC, and the 32-LQFP package exposes exactly enough I/Os for the keypad, LCD, status LEDs, and a buzzer without an I/O expander.
Recommended
Recommended Products Summary
Engineering reference data for STM32F051K6T7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM32F051K6T6 | STM32F031K6T6 | STM32F051K8T7 | GD32F130K6T6 |
|---|---|---|---|---|---|
| Package | 32-LQFP (7x7 mm) | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | GigaDevice | |
| Core | ARM Cortex-M0 48MHz | ARM Cortex-M0 48MHz | ARM Cortex-M0 48MHz | ARM Cortex-M3 48MHz | |
| Flash | 32 KB | 32 KB | 32 KB | 64 KB | 32 KB |
| SRAM | 8 KB | 8 KB | 8 KB | 8 KB | |
| Operating Temperature | -40 C to +105 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | |
| Supply Voltage | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.0 V to 3.6 V | 2.6 V to 3.6 V | |
| HDMI-CEC | Yes | Yes | No | No | |
| 1k Price (USD, as of 2026-10-23) | 1.70 | 1.60 | 1.35 | 0.65 |
Key Differentiators
- Includes HDMI-CEC hardware peripheral (vs STM32F031K6T6)
- Industrial -40C to +105C temperature grade (vs STM32F051K6T6)
- Lower cost than Cortex-M3 alternatives at parity (vs GD32F130K6T6)
Design Notes
The STM32F051K6T7 has separate VDD/VDDA and VSS/VSSA pins. Place a 100nF decoupling capacitor within 3mm of each VDD/VSS pair and a 1uF + 10nF bulk-decoupling network on VDDA. For ADC measurements, route VDDA through a ferrite bead to filter switching noise from the digital VDD plane; otherwise expect 1-2 LSB noise on the ADC. The 2.0-3.6V supply range means 3.3V is the typical choice; do not exceed 3.6V or the internal 5V-tolerant structures begin to leak.
Pin PB2 is shared between BOOT1 and I2C1_SMBA. If the application uses I2C1 in SMBus mode with PB2 as the SMB-alert pin, the BOOT0/BOOT1 bootstrap state must still be set correctly at reset. The STM32F051K6T7 has 32KB of Flash but the system bootloader consumes 8KB; the remaining 24KB is for user code if you choose to use the bootloader. Without the bootloader, the full 32KB is available, but you lose UART-based in-system programming.
The 32-LQFP package has a typical theta_JA of 65-80 C/W on a 2-layer FR-4 board with no thermal vias. For an industrial design at +105C ambient, the 25 GPIO outputs at 8mA each can dissipate up to 80mW internally before junction temperature becomes critical. Estimated: at 25 GPIOs sinking 4mA at 0.4V drop, total dissipation is roughly 40mW, producing a 2.5 C rise - well within budget. Add a small copper pour under the exposed thermal pad (LQFP packages have none, but you can place a 6x6mm pad on the top layer tied to GND) to improve heat spreading for high-I/O-count designs.
Compliance Information
RoHS and REACH compliant per ST ecopack2 marking on product page. Not AEC-Q100 qualified - for automotive use consider STM32F0x1 automotive-grade variants.
