STM8L051F3P6
Brand: ST
STM8L051F3P6 is a 8-bit STM8 microcontroller from STMicroelectronics, designed for BLHeli_S drone ESCs, battery management systems, and cost-sensitive embedded control. Superb Automation supplies genuine STM8L051F3P6 with full traceability, competitive pricing, and fast global delivery — supporting prototype to production volumes for drone, robotics, and industrial customers worldwide.
Product Specifications
STM8L051F3P6 — Ultra-Low-Power 8-Bit STM8L MCU in TSSOP-20 for Battery-Powered Drone Sensors and BMS Nodes
The STM8L051F3P6 is STMicroelectronics' cost-optimized entry into the ultra-low-power STM8L family, featuring the 16 MHz STM8 core, 8 KB Flash, 1 KB SRAM, 256 bytes EEPROM, and an industry-leading 0.35 µA Halt-mode current consumption. Packaged in TSSOP-20 and operating from 1.8V to 3.6V, it is the ideal MCU for battery-powered drone sensor nodes (temperature, humidity, GPS backup), ultra-low-power BMS sleep-mode monitors, and wireless drone telemetry tags where the device must run for months on a small LiPo or coin cell. The STM8L051 is fully pin-compatible with the 5V STM8S003 in TSSOP-20 — enabling easy migration from 5V to low-voltage, low-power designs.
Part Number Decoded — Field by Field
| Field | Value | Meaning |
|---|---|---|
| STM8 | Product Family | STMicroelectronics 8-bit MCU |
| L | Product Type | Ultra-Low-Power — 1.8–3.6V, sub-µA sleep modes |
| 051 | Sub-Family | Value Line Low-Power — cost-optimized STM8L entry |
| F | Pin Count | 20 pins (TSSOP-20) |
| 3 | Flash Size | 8 KB |
| P | Package | TSSOP |
| 6 | Temperature Range | −40°C to +85°C (industrial) |
Quick Specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Part Number | STM8L051F3P6 |
| Core | STM8 (8-bit, 16 MHz, Harvard architecture) |
| Flash / SRAM / EEPROM | 8 KB / 1 KB / 256 bytes |
| Package | TSSOP-20 (6.5×4.4 mm, 0.65 mm pitch) |
| Supply Voltage | 1.8V – 3.6V |
| Temperature | −40°C to +85°C |
| GPIO | 18 (up to 16 mA, 5V-tolerant inputs available) |
| ADC | 1× 12-bit, 4 channels |
| Timers | 3× 16-bit (2 general-purpose, 1 basic) |
| Communication | 1× USART, 1× SPI, 1× I²C |
| Power Consumption | 0.35 µA (Halt, RTC off), 175 µA/MHz (Run) |
| Debug | SWIM |
Product Overview
The STM8L051F3P6 is built on ST's ultra-low-leakage 130 nm process — the same technology that enables the STM32L0 series to achieve industry-leading low-power figures. At 0.35 µA in Halt mode (with RTC off), a CR2032 coin cell (225 mAh) can theoretically power the MCU in sleep for over 73,000 hours (8+ years) — though practical battery self-discharge limits this to ~3–5 years. This makes the STM8L051 the go-to choice for drone peripherals that must operate from small batteries for extended periods without recharging.
The 12-bit ADC (vs. 10-bit on STM8S) provides 16× finer voltage resolution (0.8 mV at 3.3V reference) — critical for precise LiPo cell voltage monitoring in BMS applications. The 1.8–3.6V supply range allows direct operation from a single LiPo cell (3.7V nominal) through a simple diode drop, or from a 3.3V regulated rail. The 256-byte EEPROM stores sensor calibration data, device configuration, and accumulated runtime statistics.
Key Features & Benefits
0.35 µA Halt Mode — Years of Battery Life from a Coin Cell
In Halt mode with all peripherals off, the STM8L051 consumes only 350 nA — among the lowest in the 8-bit MCU industry. With periodic wake-up via RTC (1.0 µA with RTC running), the MCU can sample sensors once per minute, transmit data, and sleep — achieving months of battery life on a 100 mAh LiPo for drone telemetry tag applications.
12-Bit ADC — 16× Finer Resolution for Precision Monitoring
The 12-bit successive-approximation ADC (12.5 ENOB typical) provides 0.8 mV resolution at 3.3V reference — ideal for individual LiPo cell voltage monitoring where each cell's 3.0–4.2V range spans ~1,500 ADC counts (vs. only 100 counts with 10-bit). This eliminates the need for external ADC or AFE chips in precision BMS designs.
1.8–3.6V Supply — Direct LiPo Cell Operation
The STM8L051 operates directly from a single LiPo cell (3.0–4.2V) through a simple silicon diode (0.6V drop → 2.4–3.6V), eliminating the need for a voltage regulator in minimal BOM sensor node designs. This saves $0.10–0.30 and 3–5 mm² of PCB area per device.
Target Applications
Battery-Powered Drone Sensor Node (Temp/Humidity/GPS Backup)
Wakes every 30 seconds to read an I²C temperature/humidity sensor (e.g., SHT30) and transmit data via UART or LoRa module, then sleeps at 0.35 µA. Runs for 6–12 months on a single CR2032 coin cell — ideal for environmental monitoring drones and remote weather stations.
Ultra-Low-Power BMS Sleep Monitor
Monitors battery cell voltages during storage/shipping at 0.35 µA sleep, waking periodically (via RTC) to check if any cell has dropped below the safe-storage threshold. If undervoltage detected, wakes the main BMS controller to initiate a recovery charge — preventing battery damage during extended storage.
Drone Lost-Model Locator / Telemetry Beacon
After a crash or landing, transmits GPS coordinates or beacon signal at low duty cycle for days — powered by a small backup battery. The 0.35 µA sleep + periodic transmission cycle extends locator beacon life well beyond the flight battery's endurance.
Frequently Asked Questions
STM8L051 vs. STM8S003 — which should I use?
Use STM8S003 (5V) for BLHeli_S ESCs, PDB controllers, and applications powered from a regulated 5V rail where cost is the top priority. Use STM8L051 (1.8–3.6V) for battery-powered sensor nodes, BMS sleep monitors, and any application where sub-µA sleep current matters. The L051's 12-bit ADC is also superior for precision voltage monitoring. Pin count and package (TSSOP-20) are identical and pin-compatible, but voltage levels differ — the L051 is not 5V-tolerant on most pins.
Can the STM8L051 run BLHeli_S?
No. BLHeli_S is written for the 5V STM8S core and expects 5V I/O levels for MOSFET gate driver signaling. The STM8L operates at 1.8–3.6V and cannot drive 5V gate drivers reliably. Additionally, BLHeli_S assembly code makes assumptions about STM8S-specific peripherals and timing that differ on the STM8L. For ESC applications, use STM8S variants only.
Ordering Information
| Orderable Part Number | Package | Packaging | Temperature |
|---|---|---|---|
| STM8L051F3P6 | TSSOP-20 (6.5×4.4 mm, 0.65 mm pitch) | Tube | −40°C to +85°C |
| STM8L051F3P6TR | TSSOP-20 | Tape & Reel | −40°C to +85°C |
Design Resources
- Datasheet (DS9160): STM8L051F3 — Ultra-low-power 8-bit MCU with 8 KB Flash, 12-bit ADC, full low-power mode specs.
- Reference Manual (RM0031): STM8L05x/15x — Register-level documentation for STM8L low-power peripherals, RTC, and power management.
- Application Note AN3262: STM8L05x/15x Low-Power Modes — Detailed power consumption tables and mode transition flowcharts.
- STM8CubeMX: Pinout configurator with low-power mode estimation — plan RTC, USART, ADC, and timer assignments.
- STVD + COSMIC: Free STM8 IDE — supports STM8L target with low-power library and example projects.
Request a Quote
SUPERB Automation supplies genuine STMicroelectronics STM8L051F3P6 ultra-low-power MCUs with full traceability and batch-level QA documentation. With industry-leading 0.35 µA Halt-mode current and a 12-bit ADC, the STM8L051F3P6 enables battery-powered drone sensor nodes and BMS monitors that run for years on a coin cell — the ultimate low-power 8-bit MCU for wireless drone peripherals. Whether you need prototype quantities for ESC firmware development or production volumes for drone BMS and PDB controller manufacturing, we source through verified channels with competitive lead times. Contact us with your target quantity, delivery date, and any special packaging or marking requirements — we'll respond with a detailed quotation within 24 hours.