STM8S903F3P3 - 16MHz 8-Bit MCU, 8KB Flash | STMicroelectronics
料号： STM8S903F3P3 ✓ 量产中STM8S903F3P3 概述
An 8-bit microcontroller is a compact embedded-processing component designed for control-oriented products that monitor inputs, operate actuators, and communicate with external devices. The STM8S product type belongs to the hierarchy of microcontroller, embedded processor, semiconductor, and integrated-circuit devices. The STM8S903 access line combines an economical 8-bit architecture with integrated data EEPROM and conventional serial interfaces, making it suitable for compact industrial controllers, measurement instruments, and embedded accessories.
The principal system benefits are 8 KB of nonvolatile program storage, 1 KB of volatile data memory, and 640 bytes of true data EEPROM. The 10-bit ADC supports analog measurements, while two timers support timing, pulse generation, and basic motor or LED control functions. UART, SPI, and I2C connectivity allows the MCU to communicate with sensors, displays, transceivers, and external nonvolatile memories without requiring a separate interface controller.
The STM8S903F3 operates from a 3.3 V or 5 V supply and is specified for temperatures from -40°C to +125°C. Its 20-pin TSSOP package supports compact surface-mount assemblies while exposing the core control, analog, timing, and communication functions. The STM8S903F3 family combines an 8-bit CPU with a mixed-signal peripheral set designed for cost-sensitive embedded systems that need deterministic control and moderate communication bandwidth.
Typical applications include industrial control panels, digital thermometers, environmental monitoring stations, compact motor controllers, sensor-interface modules, and communication-enabled embedded accessories. In each case, the MCU can acquire analog inputs, execute control logic, store operating parameters, and update external peripherals through its integrated communication interfaces. A 16 MHz operating rate supports responsive polling and control without a higher-complexity processor core.
When designing the PCB, reserve the 20-pin TSSOP footprint and route power, ground, programming signals, reset, and decoupling according to the manufacturer pin-description table. Place the supply bypass capacitor close to the device and use the pin table when assigning alternate-function signals. Firmware and peripheral configuration should be checked against the STM8S903F3 datasheet and the STM8 toolchain documentation before production release.
This product record combines manufacturer specifications, orderable-part information, package details, application guidance, and a structured drop-in comparison. It is intended to help engineers evaluate the STM8S903F3P3 for embedded control designs and to request current commercial availability through the page's Request a Quote form.
直接替换替代料： STM8S903F3P3 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： STM8S903F3P3 （相同外形与封装尺寸） ——差异在于 Flash Program Memory, Package, ADC Resolution, Timer Count, I2C Interface.
STM8S103F3P3
✅ 直接替换联系询价
查看数据手册 →STM8S103F3P6
✅ 直接替换联系询价
查看数据手册 →STM8S903F3U3TR
✅ 直接替换📋 参考替代料（不在目录中）
STM8S903F3P6
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →STM8S903F3C6
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
STM8S903F3P3 最大额定值与电气特性
| Product Type | 8-bit microcontroller |
| Series | STM8S |
| Core Frequency | 16 MHz |
| Flash Program Memory | 8 KB (8K x 8) |
| RAM | 1 KB |
| EEPROM | 640 bytes |
| ADC Resolution | 10 bits |
| Timer Count | 2 timers |
| UART Interface | 1 UART |
| SPI Interface | 1 SPI interface |
| I2C Interface | 1 I2C interface |
| 电源电压 | 3.3 V or 5 V |
| 工作温度 | -40°C to +125°C |
| 封装 | 20-pin TSSOP |
| 安装类型 | Surface mount |
| Programming Data Width | 8 bits |
STM8S903F3P3 20-pin tssop 引脚配置指南
STM8S903F3P3（20-pin tssop 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： STM8S903F3P3.
请参阅 数据手册 以查看完整引脚配置。
典型应用
STM8S903F3P3 适用于 6 应用s: Industrial Temperature Sensor Interface, Compact Environmental Monitoring Node, LED Timing and Indicator Controller, Low-Power Motor Control Module, Serial Protocol Gateway, Compact Consumer Appliance Controller.
Industrial Temperature Sensor Interface
The STM8S903F3P3 is suited to compact temperature-measurement instruments because its 10-bit ADC can acquire analog sensor signals while its 16 MHz core handles sampling, filtering, and display updates. The 1 KB RAM supports working buffers, and 640 bytes of EEPROM can retain calibration offsets, configuration, and identification data. UART or I2C can connect the controller to a local display, host processor, or data logger. Its specified -40°C to +125°C operating range supports equipment intended for extended industrial environments. The design should verify sensor excitation, ADC input limits, reference stability, and calibration accuracy across the complete temperature range.
推荐
Compact Environmental Monitoring Node
The STM8S903F3P3 can act as the controller in a small environmental monitoring node that measures analog inputs and periodically reports results. Its 10-bit ADC supports sensor-conditioned measurements, while the two timers help establish sampling and communication intervals. UART provides a simple point-to-point link to a radio or gateway, and I2C or SPI can accommodate digital sensors and external memory. The 8 KB Flash capacity is suitable for a focused firmware image, while EEPROM retains configuration parameters. Low-power duty cycling should be designed around the controller's clock, reset, and peripheral configuration requirements.
推荐
LED Timing and Indicator Controller
The STM8S903F3P3 is appropriate for multichannel LED indication, status panels, and simple timing products because its two timers can generate periodic timing references and controlled outputs. The 16 MHz core leaves headroom for button handling, fault logic, and communication updates alongside indicator control. SPI or I2C can drive a display driver or serial LED controller, while UART can support an upstream control unit. The 20-pin TSSOP package keeps the design compact, although it requires careful planning of timer outputs, shared pins, and ground routing. Validate flicker timing, maximum duty cycle, thermal behavior, and startup states before production.
推荐
Low-Power Motor Control Module
The STM8S903F3P3 can serve as the supervisory controller in a small stepper-motor or actuator module where timed commutation, limit sensing, and fault reporting are required. Its two timers support repetitive timing sequences, and the 10-bit ADC can monitor current, position, or temperature through suitable sensing circuits. UART offers a straightforward command interface, while SPI or I2C connects to drivers or sensors. The 8 KB Flash and 1 KB RAM fit a focused embedded application, but motor transients and inductive coupling require careful power separation, decoupling, and grounding. Confirm motor-driver logic levels and worst-case timing before releasing the PCB.
推荐
Serial Protocol Gateway
The STM8S903F3P3 is useful in small protocol-conversion or configuration accessories that must bridge a host UART to SPI- or I2C-based peripherals. Its three named serial interfaces allow the firmware to manage multiple bus roles without an external interface controller. The 16 MHz core is suitable for modest message rates and deterministic polling, while 1 KB RAM provides limited but practical working space. EEPROM can store calibration or protocol settings that must survive power cycling. The engineer should define bus timing, address conflicts, pull-up requirements, and fault recovery in firmware, then verify behavior with worst-case message lengths.
推荐
Compact Consumer Appliance Controller
The STM8S903F3P3 can control a compact appliance or embedded accessory requiring local buttons, analog sensing, timers, and status communication. Its 10-bit ADC can monitor a divided sensor signal, the timers can coordinate drive intervals, and UART can expose diagnostics to a higher-level controller. The 8 KB Flash and 640-byte EEPROM provide enough resource for a narrowly defined appliance function without an external storage device. The 3.3 V or 5 V supply choices allow alignment with common logic systems, but the final power architecture must account for loads, relays, heating elements, and safety isolation separately from the MCU rail.
推荐
推荐产品汇总
工程参考数据： STM8S903F3P3 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | STM8S103F3P3 | STM8S103F3P6 | STM8S903F3U3TR | STM8S903F3P6 | STM8S903F3C6 |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | 20-pin TSSOP | 20-pin TSSOP | 20-pin TSSOP | 20-pin TSSOP | 20-pin TSSOP | 20-pin TSSOP |
| Core Type | 8-bit STM8 core | 8-bit STM8 core | 8-bit STM8 core | 8-bit STM8 core | 8-bit STM8 core | 8-bit STM8 core |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Flash Program Memory | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| RAM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| ADC Resolution | 10 bits | 10 bits | 10 bits | 10 bits | 10 bits | 10 bits |
| Timer Count | 2 timers | 2 timers | 2 timers | 2 timers | 2 timers | 2 timers |
| Serial Interfaces | UART, SPI, and I2C | UART, SPI, and I2C | UART, SPI, and I2C | UART, SPI, and I2C | UART, SPI, and I2C | UART, SPI, and I2C |
关键差异点
- Integrated true EEPROM with compact 8-bit controller resources （对比 STM8S103F3P3)
- Mixed analog and serial functionality in 20 pins （对比 STM8S103F3P6)
- Exact 16 MHz and 8 KB Flash family alignment （对比 STM8S903F3U3TR)
设计说明
Use the manufacturer pin-description table to assign the 20 TSSOP positions and confirm every alternate-function signal before routing. Keep the supply bypass capacitor close to the device power pins, provide a low-impedance ground plane, and isolate analog sensor traces from switching or high-current outputs. Because several alternate functions can be multiplexed onto the same pins, changing a peripheral assignment may require both firmware and PCB review.
Design the 3.3 V or 5 V MCU rail so it remains stable during ADC conversion, timer activity, and serial communication. Place bulk and local decoupling according to the manufacturer guidance, and account for supply ramp time during power-on and reset. External sensors, communication transceivers, and actuator drivers should not share a poorly filtered rail with the MCU; separate noisy loads or use suitable filtering to prevent disturbances on the controller supply.
Do not treat a matching TSSOP package as proof of complete drop-in compatibility. Before substituting an STM8S variant, verify pin multiplexing, interrupt vectors, clock options, reset behavior, bootloader support, peripheral availability, and device-specific errata. The STM8S903F3 family has only 8 KB Flash and 1 KB RAM, so firmware size, stack depth, serial buffers, and EEPROM wear should also be checked before committing a replacement to production.
Maintain short return paths for the MCU ground and sensitive analog inputs, and place analog conditioning networks close to the 10-bit ADC input rather than near noisy drivers. Serial interfaces should use controlled-impedance routing where cable transitions or high-frequency edges are involved. Avoid long traces beneath or immediately beside switching nodes and provide clean boundaries between analog, digital, and external power-return areas.
合规信息
No explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status was identified for the exact orderable MPN.