STM8L050J3M3 - 8-Bit 16MHz Ultra-Low-Power MCU | STMicroelectronics
MPN: STM8L050J3M3 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.8621 | $0.86 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
STM8L050J3M3 Overview
An ultra-low-power microcontroller is a semiconductor controller optimized to complete system tasks while consuming little active and standby power. STM8L devices sit within the broader hierarchy of 8-bit microcontrollers, embedded processors, and semiconductor control components. Their low-power characteristics are useful for battery-operated sensors, building controls, appliances, and portable accessories where long operating life is more important than maximum arithmetic throughput.
The STM8L050J3M3 provides 8 KB of programmable Flash for firmware and 256 bytes of EEPROM for nonvolatile data retention. Its 16 MHz maximum CPU frequency supports responsive control of GPIO, timers, serial interfaces, and analog peripherals. Integrated USART, I2C, and SPI interfaces reduce the need for external interface hardware, while the ADC and comparators enable direct connection to sensors and simple threshold-based control loops.
The device belongs to STMicroelectronics' STM8L value line and emphasizes low-power operation and integration rather than high-performance computation. The 8-pin SOIC package supports compact through-hole assembly and is suitable for prototypes, industrial modules, metering products, and low-cost control boards. Exact pin names, alternate functions, voltage limits, current limits, clock details, and electrical timing values must be confirmed in the manufacturer datasheet before final PCB release.
Typical uses include low-cost environmental sensors, relay and actuator controllers, simple industrial interfaces, compact timers, battery-powered instruments, and serial-connected modules. Engineers should use the MCU's timers and communications peripherals to reduce polling requirements, and should select external components with attention to standby current, wake-up behavior, analog accuracy, and the voltage range required by the attached sensor or actuator.
A key design consideration is preserving low-power behavior across the entire system, not only the MCU. Use the manufacturer's recommended decoupling, clock, reset, and unused-pin arrangements, and verify the application schematic against the reference documentation. This page combines verified manufacturer and distributor product information with application guidance and clearly identifies where additional datasheet data is required.
Drop-in alternatives for STM8L050J3M3 — 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 STM8L050J3M3 (same form factor and footprint) — differing in Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STM8L001J3M3
✅ Drop-In✓ In Stock
$0.49 / Unit
View Datasheet →STM8L050J3M3 Maximum Ratings & Electrical Characteristics
| Product Type | Ultra-low-power 8-bit microcontroller |
| Series | STM8L value line |
| Maximum CPU Frequency | 16 MHz |
| Flash Memory | 8 KB |
| Data EEPROM | 256 byte |
| Integrated Peripherals | RTC, timers, USART, I2C, SPI, ADC, comparators |
| Package | 8-SOIC |
| Mounting Type | Surface mount |
| Architecture | 8-bit |
| Core Family | STM8 |
| Product Line | EnergyLite |
| RTC Availability | Yes |
| Serial Interfaces | USART, I2C, SPI |
| Analog Peripherals | ADC and comparators |
STM8L050J3M3 8-soic Pin Configuration Guide
Pin configuration for STM8L050J3M3 (8-soic package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for STM8L050J3M3.
Refer to the datasheet for full pin configuration.
Typical Applications
STM8L050J3M3 is suitable for 6 applications: Battery-Powered Environmental Sensor, Compact Relay and Actuator Controller, Low-Cost Industrial Interface Module, Serial-Connected Metering Product, Battery-Powered Timer and Sequencer, Simple Consumer Appliance Control.
Battery-Powered Environmental Sensor
STM8L050J3M3 fits a compact environmental sensor because its ultra-low-power STM8L architecture can process periodic readings from an external sensor while limiting active and standby consumption. The 16 MHz CPU provides enough control bandwidth for sampling, threshold evaluation, status reporting, and local alarms, while the integrated ADC and comparators help simplify analog front-end decisions. USART or another serial interface can connect the sensor to a host or gateway. The final battery-life target must be validated with the selected regulator, sensor, wake-up frequency, and firmware because the supplied verified snippets do not provide exact sleep-current or conversion-time figures.
Recommended
Compact Relay and Actuator Controller
STM8L050J3M3 is suitable for small relay, solenoid-valve, and actuator-control boards where an 8-bit control core, timers, and integrated comparators provide a practical low-cost platform. Timers can establish deterministic switching intervals, while comparator inputs can monitor simple thresholds before an actuator is driven through an appropriate external driver. The 8-SOIC package helps keep the controller compact, but relay isolation, flyback protection, voltage regulation, and current limits remain board-level requirements. Use the manufacturer pin and electrical limits before assigning outputs or sizing external transistors.
Recommended
Low-Cost Industrial Interface Module
STM8L050J3M3 can serve as the local controller in an industrial interface module that translates between sensors, switches, and a serial host. Its USART, I2C, and SPI options allow the same platform to support multiple external device classes, while the ADC and comparators provide basic measurement and threshold functions. This is useful for distributed monitoring where a full application processor would be unnecessary. Industrial deployment still requires review of operating voltage, noise immunity, grounding, ESD protection, and environmental limits, none of which can be fully established from the distributor snippets alone.
Recommended
Serial-Connected Metering Product
STM8L050J3M3 is a practical fit for metering products that periodically read analog or digital sensors and report measurements through USART, I2C, or SPI. The 8 KB Flash provides a defined firmware budget, and the 256-byte EEPROM can hold compact calibration or configuration values. RTC support can improve timestamped logging when the product needs a local time reference. Because the verified data does not state ADC resolution, memory endurance, or exact timer resources, verify those details against the official datasheet before selecting this MCU for regulated metering or long-life data retention.
Recommended
Battery-Powered Timer and Sequencer
STM8L050J3M3 can implement a compact timer, sequencer, or delayed-action controller for appliances and small equipment. The integrated timers support periodic timing tasks, while GPIO and comparator inputs can represent switches, interlocks, or simple sensor thresholds. Its 8-bit architecture is appropriate when the product does not need complex arithmetic or large firmware. Low-power behavior should be tested across all operating states because the available search results confirm the low-power family positioning but do not provide complete active, idle, or standby current figures.
Recommended
Simple Consumer Appliance Control
STM8L050J3M3 is suitable for simple appliance controls that combine a few switches, a display, an actuator, and local safety logic. Its integrated timers, ADC, comparators, and serial interfaces can reduce the component count compared with a discrete control design, while the 8-SOIC package is easy to prototype and assemble. Designers should establish the required input voltage, output current, ESD strategy, and safety isolation before using the MCU directly with mains-connected or high-energy circuitry. The exact electrical ratings and package pin functions must be confirmed in the official STMicroelectronics documentation.
Recommended
Recommended Products Summary
Engineering reference data for STM8L050J3M3 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8L001J3M3 |
|---|---|---|
| Package | 8-SOIC | 8-SOIC |
| Brand | STMicroelectronics | STMicroelectronics |
| Power Class | Ultra-low-power STM8L | STM8L family |
Key Differentiators
- Verified 8 KB Flash and 256-byte EEPROM combination (vs STM8L001J3M3)
- Integrated low-power control peripheral set (vs STM8L001J3M3)
- Established distributor sourcing (vs STM8L001J3M3)
Design Notes
Treat the STM8L050J3M3 power design as a system-level low-power design. Confirm the exact supply range, regulator dropout, quiescent current, and active current from the official datasheet, then size the input and bypass capacitors around those values. Keep analog and digital return paths organized so switching activity from an actuator or external regulator does not disturb ADC readings. Because the verified snippets do not provide current limits or capacitor recommendations, do not substitute generic values during schematic release.
Use the official 8-SOIC pinout and land pattern, and place required decoupling components close to the supply and ground pins. Route clock and reset signals away from high-current switching nodes, and keep analog inputs short with controlled grounding. Verify alternate-function mapping for USART, I2C, SPI, ADC, and comparators before assigning external connectors. The verified data identifies the package and peripheral families but does not provide the detailed pin table needed to finalize routing.
Do not assume that every STM8L-family device is a drop-in substitute. A valid replacement must match the exact 8-SOIC pin functions, supply limits, clock pins, peripheral assignments, memory requirements, and software assumptions. The supplied cross-reference material does not validate a complete alternative set, so review the manufacturer datasheet and errata, prototype the change, and confirm boot, timing, reset, and peripheral behavior before production. This is especially important when firmware depends on a particular alternate-function mapping.
Compliance Information
The supplied verified product snippets do not state the applicable RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The MCU is a general-purpose integrated circuit, so AEC-Q100 qualification is treated as not applicable based on the available evidence.