STM8S208RBT3 - 24MHz 128KB 8-Bit MCU | STMicroelectronics
料号： STM8S208RBT3 ✓ 量产中STM8S208RBT3 概述
An 8-bit microcontroller is a programmable semiconductor containing a processor core, memory, and integrated peripherals on one device. STM8 devices belong to the broader microcontroller and embedded-processor hierarchy, combining an 8-bit CISC-oriented architecture with deterministic real-time control peripherals. The STM8S208 performance line is positioned above smaller STM8 families by offering more Flash memory and a broad selection of communication and timing resources.
Key features of the STM8S208RBT3 include operation at up to 24 MHz, 128 KB of Flash, integrated EEPROM, a 10-bit analog-to-digital converter, multiple timers, 38 I/O ports, and support for UART, SPI, I²C, and CAN communication. These resources allow the MCU to consolidate several discrete functions on a single device and reduce component count in industrial controls, communications equipment, access systems, and embedded measurement products.
The STM8S architecture supports a supply range of 3 V to 5.5 V according to the verified distributor data. Its integrated EEPROM provides nonvolatile data storage without requiring an external memory chip, while the 10-bit ADC supports analog sensor acquisition. Two UART channels enable asynchronous serial connectivity, SPI supports higher-speed peripherals, I²C supports external sensors and EEPROMs, and CAN supports industrial network nodes.
Typical applications include industrial automation controllers, CAN-connected equipment, motor and relay control, environmental monitoring, access-control terminals, serial data acquisition, and compact consumer appliances. The 64-LQFP package provides enough I/O for external sensors, displays, transceivers, and actuators while remaining practical for leaded PCB assembly and prototype development.
Designers should verify the exact pin assignment, electrical limits, oscillator requirements, reset circuit, and decoupling recommendations against the STM8S208RB manufacturer documentation before layout. The 3 V to 5.5 V supply requirement means external interface levels and sensor voltages must remain compatible with the MCU pins used.
This product page consolidates verified manufacturer and distributor specifications, same-package replacement guidance, interface coverage, and practical engineering considerations into one reference for engineers evaluating the STM8S208RBT3.
直接替换替代料： STM8S208RBT3 ——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： STM8S208RBT3 （相同外形与封装尺寸） ——差异在于 Flash Program Memory, Integrated EEPROM, Package.
STM8S208RBT6
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →STM8S208RBT6TR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
STM8S207RBT6
✅ 直接替换 ⚠️ 规格未核验联系询价
查看数据手册 →STM8S207RBT6TR
✅ 直接替换📋 参考替代料（不在目录中）
STM8S207R8T6
✅ 直接替换📋 参考替代料（不在目录中）
STM8S208RBT3 最大额定值与电气特性
| Product Type | 8-bit microcontroller |
| Product Series | STM8S Performance line |
| Maximum CPU Clock Frequency | 24 MHz |
| Flash Program Memory | 128 KB |
| Flash Organization | 128K x 8 |
| Integrated EEPROM | Present; capacity not specified |
| ADC Resolution | 10 bits |
| UART Count | 2 |
| SPI Interface | 1 |
| I²C Interface | 1 |
| CAN Interface | 1 |
| I/O Port Count | 38 |
| Operating Supply Voltage Range | 3 V to 5.5 V |
| 封装 | 64-LQFP, 10 x 10 mm |
| 安装类型 | Surface mount |
STM8S208RBT3 64-lqfp, 10 x 10 mm 引脚配置指南
STM8S208RBT3（64-lqfp, 10 x 10 mm 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： STM8S208RBT3.
请参阅 数据手册 以查看完整引脚配置。
典型应用
STM8S208RBT3 适用于 6 应用s: CAN-Connected Industrial Control, Industrial Sensor and Data Acquisition, Access Control and Security Terminal, Motor, Relay, and Actuator Control, Serial Network Gateway, Environmental Monitoring Instrument.
CAN-Connected Industrial Control
The STM8S208RBT3 fits compact CAN nodes because it combines a 24 MHz CPU, 128 KB of Flash, integrated EEPROM, and a dedicated CAN interface in a 64-LQFP package. Its 38 I/O ports allow simultaneous connection of digital sensors, status indicators, relay drivers, and local operator inputs without requiring a separate communications MCU. The integrated EEPROM can retain configuration and calibration values, while the 10-bit ADC can monitor analog process signals. Designers should use the CAN transceiver recommended by STMicroelectronics, observe transceiver standby and termination requirements, and validate bit timing for the selected bus rate.
推荐
Industrial Sensor and Data Acquisition
The STM8S208RBT3 is suitable for distributed measurement nodes because it combines a 10-bit ADC with two UARTs, SPI, I²C, and 38 I/O pins. The 24 MHz processing rate supports responsive sampling and local filtering, while 128 KB of Flash provides room for calibration tables, communications protocols, and field-upgrade logic. I²C can connect low-speed digital sensors, SPI can serve higher-speed sensors or display controllers, and the UART channels can provide configuration or logging links. Engineers should budget conversion time and settling time against the actual sampling schedule and place analog and digital return paths carefully to avoid coupling ADC results to switching circuitry.
推荐
Access Control and Security Terminal
The STM8S208RBT3 supports access-control terminals that need local decision logic, credential-interface handling, and durable configuration storage. Its 128 KB of Flash is more useful than the 64 KB option in the STM8S207R8T6 alternative when firmware includes protocol stacks, logging, or update features. Integrated EEPROM provides nonvolatile records, and the UARTs can connect readers or host systems, while GPIO and optional communication peripherals support indicators, relays, and expansion. Because access-control equipment may face electrical transients and long service lives, the final design should include appropriate surge protection, defined reset behavior, secure programming practices, and verified brownout behavior.
推荐
Motor, Relay, and Actuator Control
The STM8S208RBT3 can serve as the control core for compact relay, solenoid, or small-motor systems where deterministic timers and numerous control pins are needed. Its 38 I/O ports allow direct interface to gate drivers, status inputs, encoders, and protection feedback, while the 24 MHz CPU supports responsive control loops and fault handling. The STM8 family timers should be allocated according to the motor-control topology and timing requirements. Because inductive loads can introduce switching transients, designers should use driver transistors or gate drivers, separate noisy return paths, add flyback protection, and confirm every actuator's absolute-maximum voltage and current limits.
推荐
Serial Network Gateway
The STM8S208RBT3 is appropriate for a small protocol-conversion gateway because it provides two UARTs, SPI, I²C, CAN, 128 KB of Flash, and 38 GPIO pins. A product can bridge a legacy RS-232 or RS-485 field link to a CAN or I²C peripheral while maintaining protocol state, filtering, and diagnostic information in Flash and EEPROM. The dual UART arrangement allows simultaneous host and field-device communication, while SPI can support a higher-throughput local module. Firmware development should account for buffering, timeout behavior, and worst-case interrupt load; interface levels must be translated through approved transceivers rather than relying on MCU pins for RS-232 voltage ranges.
推荐
Environmental Monitoring Instrument
The STM8S208RBT3 works well in a compact environmental monitor because it combines analog measurement, nonvolatile storage, and multiple bus options with a modest 64-LQFP footprint. The 10-bit ADC can read resistive sensors or conditioned analog inputs, the I²C interface can connect digital temperature and humidity sensors, and the UART can report readings to a host. Its 128 KB Flash capacity allows calibration coefficients and logging features that may not fit the STM8S207R8T6's 64 KB configuration. To obtain useful accuracy, engineers should characterize sensor excitation, ADC reference stability, input impedance, grounding, and calibration across the intended temperature range rather than relying on nominal converter resolution alone.
推荐
推荐产品汇总
工程参考数据： STM8S208RBT3 ——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 | STM8S208RBT6 | STM8S208RBT6TR | STM8S207RBT6 | STM8S207RBT6TR | STM8S207R8T6 |
|---|---|---|---|---|---|---|
| Package | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) | 64-LQFP (10 x 10 mm) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Maximum CPU Clock Frequency | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 24 MHz |
| Flash Program Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB |
| Architecture | 8-bit STM8S | 8-bit STM8S | 8-bit STM8S | 8-bit STM8S | 8-bit STM8S | 8-bit STM8S |
关键差异点
- Twice the Flash capacity of the STM8S207R8T6 option （对比 STM8S207R8T6)
- Retains the same 64-LQFP footprint across the listed STM8 alternatives （对比 STM8S207RBT6TR)
- Broad integrated interface set reduces external controller demand （对比 STM8S207R8T6)
设计说明
Create the footprint from the current STMicroelectronics STM8S208RB 64-LQFP package drawing rather than copying a generic 64-LQFP library. Confirm body dimensions, lead span, pin-1 orientation, courtyard, and solder-paste recommendations. Place all supported decoupling capacitors close to the corresponding power pins with short return paths, and route high-current or switching-node connections away from ADC inputs and oscillator circuitry.
The verified operating range is 3 V to 5.5 V, but every connected peripheral and signal must be compatible with that range. Define the power tree so motor, relay, CAN-transceiver, and display loads do not inject transients directly into the MCU supply. Validate brownout and reset behavior, provide the power-on timing required by the STM8S device, and use local bulk capacitance to manage supply steps without relying on undocumented capacitor values.
Separate analog and digital return paths as far as practical, especially when the 10-bit ADC monitors low-level sensors. Keep the ADC input traces short, avoid routing them beside UART, SPI, CAN, motor-control, or relay nets, and use a quiet ground reference if the application requires higher measurement accuracy. Follow the manufacturer's oscillator layout guidance and keep crystal or clock circuitry away from switching nodes and high-current return paths.
Do not substitute an STM8S207R8T6 solely because it uses the same 64-LQFP footprint: its verified Flash capacity is 64 KB versus 128 KB on STM8S208RBT3. Likewise, verify the exact temperature grade and ordering suffix for STM8S208RBT6 and STM8S208RBT6TR. Before approving any alternative, confirm the device identifier, pin functions, reset behavior, peripheral set, memory size, electrical limits, and development-tool support.
合规信息
The supplied search excerpts identify the lifecycle status as active but do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields therefore remain unknown.