STM8S003K3T6C - 16MHz 8-bit MCU | STMicroelectronics
MPN: STM8S003K3T6C ✓ ActiveSTM8S003K3T6C Overview
A microcontroller is a programmable semiconductor that integrates a CPU core, nonvolatile program memory, data memory, peripherals, and input/output ports on one package. Within the product hierarchy, the STM8S003K3T6C is an 8-bit MCU, a low-density member of the STM8S microcontroller family, and a value-line device intended for cost-sensitive embedded systems. Its 16 MHz operating clock supports responsive control tasks without requiring a more complex processor architecture.
Key features include 8 KB of Flash memory, 128 bytes of true data EEPROM, and a 10-bit analog-to-digital converter. Three timers support timing, counting, and basic motor or control tasks. The integrated UART, SPI, and I2C interfaces allow the MCU to connect sensors, displays, transceivers, and other digital peripherals while limiting external component count. Its 16 I/O ports provide dedicated mixed-signal and communication access on the 32-LQFP package.
The STM8S003F3/K3 value-line architecture is positioned between simple logic controllers and larger 8-bit microcontrollers. True EEPROM preserves frequently changed configuration or calibration values without requiring an external memory component. The ADC supports analog measurement, while the serial peripherals cover asynchronous communication, sensor buses, and displays. Designers should still verify the exact peripheral mapping and alternate-function assignments for their selected pins in the manufacturer pin-description table.
Typical applications include compact sensor nodes, appliance controllers, small motor-control boards, digital timers, LED-control systems, simple battery-powered instruments, and industrial monitoring modules. The combination of Flash, EEPROM, ADC, and three serial interfaces is particularly useful when a board must combine local control with a few external sensors or communication devices while minimizing board area and firmware overhead.
A key design consideration is package verification. The STM8S003K3T6C uses a 32-LQFP footprint, so replacement parts must match its pin arrangement, power pins, oscillator connections, and exposed analog functions. Check startup, reset, and debug requirements in the manufacturer reference manual, and confirm that the selected supply voltage and external component values satisfy the electrical limits for the operating temperature range.
This page combines manufacturer specifications, package and lifecycle information, interface-oriented application guidance, and a strict drop-in replacement review. It also distinguishes electrical and mechanical compatibility from simple functional similarity, helping engineers shortlist a device for an existing STM8S003K3T6C PCB with greater engineering confidence.
Drop-in alternatives for STM8S003K3T6C — 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 STM8S003K3T6C (same form factor and footprint) — differing in Package, ADC Resolution, Core Architecture, Operating Temperature, Timers.
STM8S903K3T6C
✅ Drop-InContact for price
View Datasheet →STM8S003K3T6C Maximum Ratings & Electrical Characteristics
| Product Type | 8-bit value-line microcontroller |
| Maximum Clock Frequency | 16 MHz |
| Flash Program Memory | 8 KB |
| Flash Organization | 8K x 8 |
| Data EEPROM | 128 bytes |
| ADC Resolution | 10 bits |
| Timer Count | 3 timers |
| Serial Interfaces | 1 UART, 1 SPI, 1 I2C |
| I/O Port Count | 16 I/O ports |
| Supply Voltage Range | 2.95 V to 5.5 V |
| Package | 32-LQFP (7 x 7 mm) |
| Mounting Type | Surface mount |
| Core Architecture | 8-bit STM8S |
| Program Memory Type | Flash |
| Lifecycle Status | Active |
STM8S003K3T6C 32-lqfp (7 x 7 mm) Pin Configuration Guide
Pin configuration for STM8S003K3T6C (32-lqfp (7 x 7 mm) 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 STM8S003K3T6C.
Refer to the datasheet for full pin configuration.
Typical Applications
STM8S003K3T6C is suitable for 6 applications: Compact Sensor Monitoring, Appliance Control Panel, Small Motor and Relay Control, Digital Timer and Sequencer, LED Lighting Controller, Battery-Powered Data Logger.
Compact Sensor Monitoring
The STM8S003K3T6C fits compact sensing modules because its 10-bit ADC measures analog inputs while its 16 I/O ports support sensors, indicators, and local control logic. Three timers provide independent timing functions for sampling, debouncing, and periodic updates, while UART, SPI, and I2C permit connection to digital sensors or external memory. The 2.95 V to 5.5 V supply range also allows deployment in 3.3 V and 5 V designs. The primary design task is to assign ADC-capable pins carefully and configure the acquisition timing in firmware.
Recommended
Appliance Control Panel
The STM8S003K3T6C is appropriate for appliance control panels that combine button inputs, indicators, a small display, and configurable internal settings. Its 8 KB Flash stores the control firmware, while 128 bytes of true EEPROM can retain selected operating parameters. The UART can serve a display or service interface, and the timers can manage button scanning, delays, and actuator timing. The 32-LQFP footprint provides more pins than the smaller K3 devices while remaining practical for a densely populated control board.
Recommended
Small Motor and Relay Control
The STM8S003K3T6C can control small motors, relays, solenoids, and status indicators when its timers are used for edge detection, pulse generation, or debouncing. Sixteen I/O ports leave enough interface capacity for discrete driver inputs and fault signals, while the three timers support time-critical sequencing. The ADC can monitor a supply or sensor input for supervisory functions. Because an MCU output is not a substitute for a power driver, use an appropriate transistor or motor-driver stage and account for inductive transients.
Recommended
Digital Timer and Sequencer
The STM8S003K3T6C is well suited to digital timers, sequence controllers, and small process-control modules because three hardware timers can run concurrently with CPU firmware. The 16 MHz clock supports responsive event handling, and 8 KB of Flash accommodates compact state-machine logic. UART and I2C can connect to a display, data logger, or supervisory controller, while the ADC permits monitoring an analog timing reference. Keep each timer’s operating mode and interrupt load deterministic so that timing does not depend on blocking software delays.
Recommended
LED Lighting Controller
The STM8S003K3T6C supports compact LED lighting controllers where multiple channels require sequencing, dimming, status feedback, or configuration storage. Its timers can generate precise switching intervals, and the 10-bit ADC may monitor a current-sense signal for simple feedback control. UART, SPI, and I2C enable integration with a master controller, LED driver, or local configuration module. The principal design consideration is to keep high-current LED drive stages separate from sensitive MCU supply and ground paths.
Recommended
Battery-Powered Data Logger
The STM8S003K3T6C can serve as the control device in a small battery-powered data logger that periodically samples sensors and stores or transmits readings. Its low-density 8 KB Flash limits firmware complexity, but the 128-byte EEPROM can retain calibration factors and operating counters. The timers can schedule measurements, the ADC acquires analog channels, and UART or I2C can communicate with a memory module or radio. Power-loss behavior should be tested so that configuration writes occur only when the supply can support safe completion.
Recommended
Recommended Products Summary
Engineering reference data for STM8S003K3T6C — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | STM8S903K3T6C |
|---|---|---|
| Package | 32-LQFP (7 x 7 mm) | 32-LQFP (7 x 7 mm) |
| Brand | STMicroelectronics | STMicroelectronics |
| Maximum Clock Frequency | 16 MHz | 16 MHz |
| Flash Program Memory | 8 KB | 8 KB |
| Data EEPROM | 128 bytes | 128 bytes |
| ADC Resolution | 10 bits | 10 bits |
| Timer Count | 3 timers | 3 timers |
| Serial Interfaces | UART, SPI, I2C | UART, SPI, I2C |
Key Differentiators
- Compact mixed-signal control in one device (vs STM8S903K3T6C)
- On-chip parameter retention (vs STM8S903K3T6C)
- Value-line integration (vs STM8S903K3T6C)
Design Notes
Route the STM8S003K3T6C power pins and decoupling capacitor directly to the device, with the capacitor placed on the same side of the PCB whenever possible. Connect the 16 MHz oscillator network close to the relevant pins and maintain a compact return path. Because the 32-LQFP footprint is easy to confuse with similar STM8 devices, verify every pin against the manufacturer pin-description table before releasing artwork.
Keep analog inputs away from UART, SPI, and I2C routing when the PCB permits, and provide a quiet ground reference for the 10-bit ADC. If the selected pins have alternate analog functions, verify their configuration in the device documentation. For mixed-signal boards, route the MCU ground toward the analog connector through a deliberate ground strategy rather than relying on a single high-current return path.
Do not treat same-package devices as automatically interchangeable. The STM8S903K3T6C candidate shares the 32-LQFP format and headline resources, but replacement requires checking pin assignments, interrupt vectors, timer behavior, ADC implementation, and firmware startup. Also distinguish STM8S003K3T6C from STM8S003K3T6CTR: the latter changes the orderable packing suffix rather than providing a different second-source device.
Operate the MCU only within its 2.95 V to 5.5 V supply range and account for voltage tolerance, ripple, and startup behavior across the complete operating temperature range. If the board includes relays, motors, LEDs, or other switched loads, separate their supply paths and return currents from sensitive MCU nodes. Validate brownout behavior and the state of I/O pins during reset before connecting external circuitry.
Compliance Information
The manufacturer product page and family datasheet identify the STM8S003K3 value-line device as active. Detailed environmental, material, and automotive qualification declarations require confirmation from the current manufacturer compliance documentation.