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STMicroelectronics ST72T141K2M6
- Part No.:
- ST72T141K2M6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 34-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
ST72T141K2M6.pdf
- Description:
- IC MCU 8BIT 8KB OTP 34SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,564
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Product details
Overview
ST72T141K2M6 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, 4–5.5 V operating supply, and operates up to 8 MHz CPU frequency using internal or external oscillator. Used in industrial BLDC motor drives requiring rotor position sensing and current limiting.
For engineers reviewing the ST72T141K2M6 datasheet, ST72T141K2M6 pinout, ST72T141K2M6 application, or ST72T141K2M6 equivalent, key selection criteria include motor control peripheral integration (emergency stop, 3 analog rotor position inputs, comparator-based current limit), dual 16-bit timer flexibility (input capture/output compare), and OTP-based firmware security for cost-sensitive production.
Technical Context
The ST72T141K2M6 implements a dedicated Motor Control (MTC) peripheral with six PWM output channels (MCO0–MCO5), emergency stop input (MCES) forcing all outputs to high-impedance, and three analog inputs (MCIA/MCIB/MCIC) for sensorless rotor position detection. Its MTC supports 6-step commutation without external Hall sensors.
It integrates two independent 16-bit timers (Timer A and Timer B), each supporting input capture (ICAP1/2_A/B), output compare (OCMP1/2_A/B), external clock input (EXTCLK_A/B), and PWM generation. The SPI interface operates in master/slave mode with full-duplex synchronous serial communication at up to fCLK/2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with 63 instructions, true bit manipulation, and 8×8 unsigned multiply - enables compact, deterministic motor control firmware. |
| Program Memory | 8 KB OTP ROM - provides non-volatile, tamper-resistant firmware storage ideal for volume production without reprogramming risk. |
| RAM | 256 bytes (64-byte stack) - sufficient for real-time BLDC control state variables, ADC buffers, and interrupt context storage. |
| ADC | 8-bit resolution, 8 input channels (AIN0–AIN7) - supports simultaneous sampling of motor phase voltages and bus current for sensorless FOC pre-processing. |
| PWM Outputs | 6 independent channels (MCO0–MCO5) with programmable dead-time - directly drives 3-phase inverter gate drivers in 6-step or trapezoidal commutation. |
| Operating Voltage | 4.0 V to 5.5 V - compatible with standard 5 V industrial logic and motor driver ICs, eliminating need for level-shifting. |
| CPU Frequency | Up to 8 MHz (with 16 MHz crystal) - delivers ~1.25 µs instruction cycle time, enabling sub-10 µs critical timing for overcurrent shutdown response. |
Pinout & Package
ST72T141K2M6 is available in SO34 (34-pin small outline) and SDIP32 (32-pin shrink dual in-line) packages. Both are lead-free, RoHS-compliant surface-mount packages suitable for automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MCO0–MCO5 | Motor control PWM outputs | Direct drive signals for 3-phase inverter high/low-side gates; support complementary pair configuration with hardware-enforced dead-time. |
| MCES | Emergency stop input | Asynchronous active-low signal forcing all MCO pins to Hi-Z within one instruction cycle - critical for fast fault shutdown in motor overcurrent or stall conditions. |
| MCIA/MCIB/MCIC | Rotor position analog inputs | Dedicated 3-input analog front-end for back-EMF zero-crossing detection - eliminates need for external comparators or Hall-effect sensors in sensorless BLDC control. |
| PA0–PA7 / AIN0–AIN7 | ADC input channels | Shared with Port A I/O; enable simultaneous acquisition of motor phase currents, bus voltage, and temperature for closed-loop torque/speed regulation. |
| OSC1/OSC2 | Crystal oscillator terminals | Support 4–16 MHz quartz crystals or ceramic resonators - provides stable, low-jitter clock source for precise PWM timing and ADC sampling synchronization. |
| RESET | Active-low reset input | Non-maskable, Schmitt-triggered input with internal pull-up - ensures reliable power-on and brown-out recovery in electrically noisy motor drive environments. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated motor control peripheral (MTC) | Hardware-accelerated 6-step commutation engine with emergency stop, eliminating software overhead and timing jitter in critical fault paths. |
| Sensorless rotor position detection | Three dedicated analog inputs (MCIA/B/C) with internal comparator routing - enables robust back-EMF zero-crossing detection without external components. |
| Current limiting via comparator | On-chip comparator monitors MCCFI pin against reference; triggers immediate PWM disable on overcurrent - reduces external protection circuitry count by ≥2 components. |
| Dual 16-bit timers with input capture | Timer A and Timer B each provide two input capture registers (ICAP1/2) - allows precise measurement of motor electrical period and rotor position timing for adaptive commutation. |
| OTP program memory | 8 KB one-time-programmable ROM - prevents firmware cloning and unauthorized updates in production motor modules while lowering BOM vs. flash-based alternatives. |
Applications
| Industrial BLDC Motor Drive | Appliance Fan Controller |
|---|---|
Use Scenario: Closed-loop speed control of 3-phase BLDC motors in HVAC blowers and industrial pumps using sensorless 6-step commutation. IC Role / Device Role / Timing Role: Primary motor controller executing real-time commutation logic, ADC sampling, and PWM generation with sub-10 µs interrupt latency. Use Value: Eliminates Hall sensors and external current-sense amplifiers, reducing system cost by $1.20 and PCB area by 18 mm² per unit. | Use Scenario: Variable-speed fan control in refrigerators and washing machines with soft-start, thermal derating, and acoustic noise optimization. IC Role / Device Role / Timing Role: Standalone motor management unit handling startup sequencing, RPM feedback via back-EMF zero-crossing, and PWM duty-cycle modulation. Use Value: Achieves <35 dB(A) acoustic noise at 3000 RPM through precise 20 kHz PWM carrier frequency control and dynamic dead-time adjustment. |
| Power Tool Motor Module | Automotive Auxiliary Pump |
Use Scenario: High-torque, battery-powered drill/driver with electronic torque limiting, stall detection, and battery voltage compensation. IC Role / Device Role / Timing Role: Real-time torque estimator using ADC-measured phase current and PWM duty cycle, triggering emergency stop via MCES on overcurrent. Use Value: Enables 150 ms response to stall condition (vs. 500 ms with discrete comparator solution), preventing MOSFET thermal runaway. | Use Scenario: 12 V auxiliary coolant or oil pump in mild-hybrid vehicles requiring ASIL-B functional safety compliance. IC Role / Device Role / Timing Role: Safety-critical motor actuator managing watchdog supervision, supply monitoring (LVD), and fail-safe shutdown via hardware MCES assertion. Use Value: Meets ISO 26262 diagnostic coverage requirements for single-point faults through integrated LVD, WDG, and emergency stop path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar motor control microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324B2M6 | Flash-based (16 KB), no dedicated MTC peripheral, requires software PWM and external comparators for current limiting. | Lacks hardware emergency stop and rotor position inputs - increases firmware complexity and reduces fault response reliability. | Select when field firmware updates are required and motor control algorithm is simple enough for software implementation. |
| STM8S105K4T6C | Enhanced STM8 core, 16 KB Flash, integrated 16-bit motor control timer (TIM1), but no dedicated MCIA/B/C analog inputs. | Requires external op-amps/comparators for sensorless position detection - adds BOM cost and board space. | Select for higher performance (16 MHz) and future-proof Flash upgrade path where sensor integration is acceptable. |
Compared with ST72F324B2M6 and STM8S105K4T6C, the ST72T141K2M6 offers superior integration for cost-sensitive, high-volume BLDC applications where OTP security, hardware emergency stop, and sensorless rotor position detection reduce total system BOM and improve functional safety response time.
Availability
ST72T141K2M6 is available at Aetrix Electronics and suitable for industrial motor drives, appliance fan controllers, power tool modules, and automotive auxiliary pumps requiring stable component supply across long-lifecycle production programs.
Supply support for ST72T141K2M6 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-optimized, real-time motor control applications - prioritizing hardware-peripheral integration (MTC, ADC, timers) over general-purpose computing features to minimize firmware development effort and system-level component count.
FAQ
Is ST72T141K2M6 still in active production?
No - ST72T141K2M6 is marked as obsolete by STMicroelectronics (as confirmed in the November 2008 Rev. 2 datasheet). However, Aetrix Electronics maintains legacy inventory and offers extended lifecycle support, including last-time-buy planning and cross-reference assistance for migration to pin-compatible or functionally aligned successors like STM8S105K4T6C.
What is the maximum allowable clock frequency for the ST72T141K2M6?
The ST72T141K2M6 supports a maximum CPU frequency of 8 MHz when using a 16 MHz external crystal oscillator (via internal /2 prescaler). With an 8 MHz crystal, it runs at 4 MHz. The internal RC oscillator option is not specified for this variant; operation relies on external crystal or ceramic resonator connected to OSC1/OSC2.
Does ST72T141K2M6 support in-circuit debugging or programming?
No - ST72T141K2M6 uses OTP (one-time-programmable) memory and lacks SWIM or UART-based bootloader capability. Programming occurs only once during manufacturing using dedicated OTP programmers (e.g., ST's STVP tool with appropriate socket adapter). Debugging requires external logic analyzers or oscilloscopes monitoring MCO/PWM and ADC signals.
Can the emergency stop (MCES) pin be used for normal GPIO functions?
No - MCES is a dedicated, asynchronous, level-sensitive input with fixed hardware behavior: asserting low forces all MCO outputs into high-impedance state within one instruction cycle, independent of CPU state or interrupts. It cannot be reconfigured as general-purpose I/O or assigned alternate functions per the datasheet pin description table.
ST72T141K2M6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 34-BSOP (0.295", 7.50mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
ST72T141K2M6 FAQ
1.How can I place an order for ST72T141K2M6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72T141K2M6 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 ST72T141K2M6 reliable?
The price and inventory of ST72T141K2M6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72T141K2M6 is usually 5 days.
3.What payment methods are accepted for ST72T141K2M6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72T141K2M6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72T141K2M6?
ST72T141K2M6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72T141K2M6 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 ST72T141K2M6?
For technical support, including ST72T141K2M6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72T141K2M6 requirements.
6.How does Aetrix verify that ST72T141K2M6 is sourced from the original manufacturer or authorized distributors?
All ST72T141K2M6 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 ST72T141K2M6 meets industry standards.
7.What is the process for return or replacement of ST72T141K2M6?
All ST72T141K2M6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72T141K2M6, 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 ST72T141K2M6 part is unused and in its original packaging.
Return procedure for ST72T141K2M6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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