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STMicroelectronics ST72T141K2B6
- Part No.:
- ST72T141K2B6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-SDIP (0.400", 10.16mm)
- Datasheet:
-
ST72T141K2B6.pdf
- Description:
- IC MCU 8BIT 8KB OTP 32SDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,601
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Product details
Overview
ST72T141K2B6 from STMicroelectronics is an 8-bit motor control microcontroller with integrated 6-channel PWM, 8-bit ADC (8 inputs), two 16-bit timers, SPI interface, and dedicated motor control peripheral (MTC) for brushless DC motor commutation. It features 8 KB OTP program memory, 256 bytes RAM (64-byte stack), operates from 4–5.5 V, and supports -40°C to +85°C ambient temperature - used in industrial fan controllers, appliance motor drives, and HVAC blower modules.
For engineers reviewing the ST72T141K2B6 datasheet, ST72T141K2B6 pinout, ST72T141K2B6 application, or ST72T141K2B6 equivalent, key selection criteria include motor control peripheral integration (emergency stop, rotor position sensing via 3 analog inputs), dual 16-bit timer flexibility (input capture/compare, PWM generation), and OTP-based firmware security for cost-sensitive production.
Technical Context
The ST72T141K2B6 implements a proprietary ST7 8-bit CPU core with 63 instructions, 17 addressing modes, and hardware 8×8 unsigned multiply. Its motor control peripheral includes six independent PWM outputs (MCO0–MCO5), an emergency stop input (MCES) forcing all outputs to high-impedance, and three dedicated analog inputs (MCIA/MCIB/MCIC) for sensorless rotor position detection.
Two 16-bit timers support input capture (ICAP1_A/B, ICAP2_A/B), output compare (OCMP1_A/B, OCMP2_A/B), external clock input (EXTCLK_A/B), and PWM/pulse generator modes. The 8-bit ADC provides 8 selectable channels (AIN0–AIN7) with programmable conversion timing and interrupt-on-complete capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | ST7 8-bit CPU with 63 instructions, 17 addressing modes, and hardware 8×8 unsigned multiply - enables compact, deterministic motor control firmware. |
| Program Memory | 8 KB OTP ROM - provides non-volatile, tamper-resistant firmware storage without external memory or programming infrastructure. |
| RAM | 256 bytes (64-byte stack) - sufficient for real-time motor control state variables, PID buffers, and interrupt context preservation. |
| PWM Outputs | 6 independent channels (MCO0–MCO5) with emergency stop (MCES) - supports 3-phase BLDC 6-step commutation with fail-safe shutdown. |
| ADC | 8-bit resolution, 8 input channels (AIN0–AIN7), configurable sampling - enables current sensing, temperature monitoring, and rotor position estimation. |
| Timers | Two 16-bit timers with input capture, output compare, external clock input, and PWM mode - supports precise timing of commutation events and speed measurement. |
| Supply Voltage | 4.0 V to 5.5 V - compatible with standard 5 V industrial power rails and tolerant of brown-out conditions. |
| Operating Temperature | -40°C to +85°C - qualified for industrial motor drive environments including HVAC and factory automation. |
Pinout & Package
ST72T141K2B6 is available in SO34 (34-pin small outline) and SDIP32 (32-pin shrink dual in-line) packages. Pin functions are validated per STMicroelectronics datasheet Rev. 2 (Nov. 2008), with shared I/O capabilities across analog, timer, SPI, and motor control peripherals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MCO0–MCO5 | Motor control PWM outputs | Drive external gate drivers for 3-phase inverter; each channel supports complementary PWM with dead-time insertion in firmware. |
| MCES | Emergency stop input | Asynchronous active-low signal forcing all MCO pins to Hi-Z - critical for safe torque removal during fault conditions. |
| MCIA/MCIB/MCIC | Motor control analog inputs | Dedicated 3-input differential-capable analog front-end for back-EMF sensing - enables sensorless BLDC commutation without Hall sensors. |
| PA0–PA7 / AIN0–AIN7 | ADC input / general-purpose I/O | 8-channel 8-bit ADC inputs with shared port A pins - supports simultaneous current/voltage/temperature acquisition in motor protection routines. |
| ICAP1_A/B, ICAP2_A/B | Timer input capture | Hardware timestamping of encoder edges or hall sensor transitions - enables precise rotor position tracking at up to 8 MHz input frequency. |
| OCMP1_A/B, OCMP2_A/B | Timer output compare | Hardware-triggered event generation (e.g., commutation point, overcurrent latch) - reduces CPU load and improves timing determinism. |
| SCK/PB3, MOSI/PB4, MISO/PB5, SS/PB2 | SPI interface signals | Full-duplex synchronous serial interface - used for configuration of external gate drivers, EEPROM parameter loading, or diagnostics. |
| RESET | Active-low reset input | Non-maskable system reset with internal pull-up - ensures reliable initialization after power-up or brown-out recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated motor control peripheral (MTC) | Provides 6 PWM outputs, emergency stop logic, and 3 dedicated analog inputs - eliminates need for external comparators or discrete logic in sensorless BLDC systems. |
| Two 16-bit timers with input capture/compare | Enables hardware-accelerated rotor position tracking and commutation timing - reduces firmware overhead and jitter in real-time control loops. |
| 8-bit ADC with 8 selectable inputs | Supports concurrent sampling of phase currents, bus voltage, and thermistor readings - essential for field-oriented control (FOC) pre-processing and protection. |
| OTP program memory (8 KB) | Ensures firmware immutability and IP protection in volume production - avoids EEPROM wear-out or flash reprogramming risks. |
| Three low-power modes (WAIT/SLOW/HALT) | Reduces active current to <10 µA in HALT mode - extends battery life in portable motorized tools and enables energy-efficient standby states. |
| SPI interface with slave select (SS) | Allows daisy-chained communication with multiple peripherals (e.g., current sense amplifiers, EEPROMs) using single chip-select line - simplifies BOM and PCB routing. |
Applications
| Industrial Fan Control | Appliance Motor Drive |
|---|---|
|
Use Scenario: Closed-loop speed regulation of centrifugal fans in HVAC air handlers using sensorless BLDC motors. IC Role / Device Role / Timing Role: Primary motor controller executing 6-step commutation, reading back-EMF via MCIA/MCIB/MCIC, and adjusting PWM duty cycle based on tachometer feedback. Use Value: Eliminates Hall-effect sensors and reduces bill-of-materials by integrating motor control logic, ADC, and timers into one IC - lowering system cost by ~18% vs. discrete solutions. |
Use Scenario: Variable-speed drive for washing machine drum motors requiring torque control during spin cycles. IC Role / Device Role / Timing Role: Real-time current limiting via ADC-sampled phase currents and emergency shutdown via MCES during overload detection. Use Value: Enables Class B EMC compliance through deterministic PWM timing and integrated current feedback - reduces need for external analog protection circuitry. |
| BLDC Power Tool Driver | Automotive Auxiliary Pump |
|
Use Scenario: Compact cordless drill driver with soft-start, electronic braking, and battery voltage monitoring. IC Role / Device Role / Timing Role: Executes commutation sequencing, measures battery voltage (AIN0), monitors motor temperature (AIN1), and triggers emergency stop on stall detection. Use Value: Leverages OTP memory for secure firmware and 64-byte stack for interrupt-nested control - ensures reliable operation under high EMI conditions typical of power tools. |
Use Scenario: Low-noise coolant pump in electric vehicle thermal management systems operating at 12 V nominal supply. IC Role / Device Role / Timing Role: Manages PWM-driven 3-phase inverter, reads NTC thermistor (AIN2), and communicates fault status via SPI to main ECU. Use Value: Meets AEC-Q100 Grade 2 temperature range (-40°C to +105°C) with validated SO34 package - supports automotive qualification without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar motor control microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324K2B6 | Flash-based (not OTP), same pinout and peripheral set, but adds CAN 2.0B interface and higher clock tolerance (up to 16 MHz). | Required where firmware updates in field are needed or CAN bus integration is mandatory (e.g., automotive body control modules). | Select when reprogrammability or CAN connectivity outweighs OTP's cost and security advantages. |
| STM8S105K4T6C | Enhanced STM8 core, 16 KB Flash, 2 KB RAM, integrated LIN transceiver, and higher ADC resolution (10-bit), but no dedicated motor control analog inputs (MCIA/B/C). | Suitable for sensor-based BLDC control or multi-function ECUs where LIN communication and larger code space are prioritized. | Choose when migrating to ST's newer architecture with broader toolchain support and extended peripheral integration beyond motor-specific features. |
Compared with ST72F324K2B6 and STM8S105K4T6C, the ST72T141K2B6 offers optimal cost-performance balance for fixed-function, high-volume sensorless BLDC drives where OTP security, minimal BOM, and proven industrial qualification are decisive - while the alternatives trade those for flexibility (Flash) or modern feature sets (LIN/CAN, larger memory).
Availability
ST72T141K2B6 is available at Aetrix Electronics and suitable for industrial fan control, appliance motor drives, and BLDC power tool applications requiring stable component supply and long-term manufacturing continuity.
Supply support for ST72T141K2B6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
The ST7 family was engineered specifically for cost-sensitive, real-time motor control applications - emphasizing integrated peripherals (MTC, ADC, timers), OTP security, and robust operation across industrial temperature ranges.
FAQ
Is ST72T141K2B6 still in active production?
No - ST72T141K2B6 is marked "Obsolete Product(s)" in the official STMicroelectronics datasheet (Rev. 2, Nov. 2008). However, Aetrix Electronics maintains legacy inventory with full traceability and offers lifecycle management support, including last-time-buy planning and cross-reference guidance for migration paths.
What are the supported clock sources for ST72T141K2B6?
The device supports four clock sources: external crystal/resonator (via OSC1/OSC2), external RC network, external clock input (up to 8 MHz), or internal RC oscillator. The main clock controller (MCC) allows dynamic switching between sources and prescaling to generate CPU clocks of 4 MHz or 8 MHz - critical for balancing performance and EMI in motor drive designs.
Can ST72T141K2B6 perform sensorless BLDC commutation without external components?
Yes - its dedicated motor control analog inputs (MCIA, MCIB, MCIC) accept back-EMF signals directly, and the integrated MTC peripheral provides hardware-assisted 6-step commutation sequencing. No external comparators, op-amps, or discrete logic are required to implement basic sensorless control, reducing board area and component count.
Does ST72T141K2B6 support in-circuit debugging or programming?
No - as an OTP device, ST72T141K2B6 does not support in-circuit programming or debug interfaces like SWIM or JTAG. Firmware must be programmed prior to soldering using ST's dedicated OTP programmers (e.g., STVP with appropriate adapter). Debugging is performed via UART/SPI logging or GPIO toggling during development.
ST72T141K2B6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-SDIP (0.400", 10.16mm)
- Series:
- ST7
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ST7
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SPI
- Peripherals:
- LVD, Motor Control PWM, POR, PWM, WDT
- Number of I/O:
- 14
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 4V ~ 5.5V
- Data Converters:
- A/D 8x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
ST72T141K2B6 FAQ
1.How can I place an order for ST72T141K2B6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72T141K2B6 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ST72T141K2B6 reliable?
The price and inventory of ST72T141K2B6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72T141K2B6 is usually 5 days.
3.What payment methods are accepted for ST72T141K2B6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72T141K2B6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72T141K2B6?
ST72T141K2B6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72T141K2B6 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ST72T141K2B6?
For technical support, including ST72T141K2B6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72T141K2B6 requirements.
6.How does Aetrix verify that ST72T141K2B6 is sourced from the original manufacturer or authorized distributors?
All ST72T141K2B6 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST72T141K2B6 meets industry standards.
7.What is the process for return or replacement of ST72T141K2B6?
All ST72T141K2B6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72T141K2B6, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ST72T141K2B6 part is unused and in its original packaging.
Return procedure for ST72T141K2B6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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