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STMicroelectronics ST72F324J4B5
- Part No.:
- ST72F324J4B5
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 42-DIP (0.600", 15.24mm)
- Datasheet:
-
ST72F324J4B5.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 42DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
ST72F324J4B5 from STMicroelectronics is an 8-bit Flash microcontroller with 8 KB program memory, 384 bytes RAM, 10-bit ADC (12 input channels), dual 16-bit timers (Timer A and Timer B), SPI and SCI serial interfaces, and four power-saving modes (Halt, Active-Halt, Wait, Slow). It operates across 3.8 V to 5.5 V and supports industrial temperature range (−40°C to +125°C), targeting embedded control in motor drives and industrial sensors.
For engineers reviewing the ST72F324J4B5 datasheet, ST72F324J4B5 pinout, ST72F324J4B5 application, or ST72F324J4B5 equivalent, this MCU delivers deterministic real-time control with nested interrupts (10 vectors), programmable low-voltage detection (LVD), PLL-based clock multiplication, and in-application programming (IAP) for field firmware updates - critical for cost-sensitive, long-lifecycle industrial deployments.
Technical Context
The ST72F324J4B5 implements the ST7 CPU core with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its clock system integrates a programmable PLL (2× multiplication), internal RC oscillator, crystal/ceramic resonator support, and clock security system with bypass capability.
Interrupt handling uses a nested controller with 9/6 external interrupt lines mapped across 4 vectors, TRAP, and RESET. Peripheral integration includes a Main Clock Controller (MCC) with real-time base, beep generator, and clock-out function; configurable watchdog timer; and low-current-coupled 10-bit ADC with robust input protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit ST7 CPU with 63 instructions and 17 addressing modes - enables compact, deterministic code for resource-constrained control loops. |
| Flash Memory | 8 KB HD-Flash with read-out protection and 100-cycle endurance - supports secure firmware storage and field updates via IAP/ICP. |
| RAM Size | 384 bytes (256-byte stack) - sufficient for real-time task stacks and small data buffers in sensor or actuator control. |
| ADC Resolution | 10-bit SAR ADC with up to 12 input channels - provides 1 LSB = ~4.88 mV at 5 V, suitable for precision analog sensing. |
| Timers | Dual 16-bit timers: Timer A (1 capture/1 compare/PWM) and Timer B (2 capture/2 compare/PWM) - enables synchronized motor phase control and pulse generation. |
| Communication | SPI (master/slave) and SCI (asynchronous UART) - supports daisy-chained sensor networks and host MCU communication without protocol overhead. |
| Supply Range | 3.8 V to 5.5 V - compatible with standard 5 V industrial rails and tolerant of brown-out conditions via LVD/AVD. |
Pinout & Package
TQFP32 (7 × 7 mm, 0.8 mm pitch) package with 32-pin layout optimized for compact industrial PCBs. All I/O pins support multifunctional bidirectional operation, including 12 high-sink outputs (20 mA sink per pin).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domain: VDD powers core/peripherals; VSS is common reference - requires local 100 nF decoupling per supply pair. |
| OSCIN/OSCOUT | Crystal/resonator interface | Supports 1–8 MHz crystals or ceramic resonators; internal load caps eliminate external components in most designs. |
| RESET | Asynchronous active-low reset | Hardware-initiated cold start or recovery from fault; debounced externally or via internal LVD-triggered assertion. |
| PA0–PA7 | Port A I/O lines | 8-bit bidirectional port with alternate functions: SCI TX/RX, SPI SCK/MOSI/MISO, Timer A/B signals - enables flexible peripheral mapping. |
| PD0–PD3 | Port D I/O lines | 4-bit port supporting ADC inputs (AD0–AD3), external interrupts, and high-sink outputs - used for analog front-end and wake-up event detection. |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates over SCI or SPI without external programmer - reduces service downtime in deployed equipment. |
| Enhanced Low-Voltage Detector (LVD) | Programmable reset thresholds with interrupt capability - allows graceful shutdown or safe state entry before brown-out. |
| Nested Interrupt Controller | 10 priority-level vectors with automatic context save - guarantees sub-2 µs latency for time-critical events like encoder zero-crossing. |
| Four Power-Saving Modes | Halt (1.5 µA), Active-Halt (25 µA), Wait (50 µA), Slow (120 µA) - extends battery life in portable industrial monitors and wireless nodes. |
| Main Clock Controller (MCC) | Integrates RTC, beep generator, and clock-out signal - eliminates need for external timing ICs in HMI or alarm subsystems. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop speed regulation of BLDC fans using hall-effect feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Real-time execution of commutation logic, ADC sampling of current/voltage, and precise 20 kHz PWM generation via Timer B. Use Value: Deterministic 1.2 µs interrupt latency ensures phase alignment within ±0.5° electrical angle, reducing torque ripple by >15%. |
Use Scenario: Battery-powered temperature/humidity node transmitting data via RS-485 to PLC over SCI interface. IC Role / Device Role / Timing Role: Low-power coordinator managing ADC conversions, SPI flash logging, and SCI framing with hardware parity. Use Value: Active-Halt mode draws only 25 µA while retaining RAM and register state, enabling 5-year operation on two AA cells. |
| Programmable Logic Relay | Industrial HMI Panel |
Use Scenario: DIN-rail mounted relay module executing ladder logic with discrete I/O scanning and timer-based sequencing. IC Role / Device Role / Timing Role: Central controller polling 12 digital inputs, driving 8 high-sink outputs, and maintaining 100 ms scan cycle via MCC real-time base. Use Value: 12 high-sink outputs (20 mA each) directly drive 24 V DC coils without external drivers, cutting BOM cost by $0.32/unit. |
Use Scenario: Keypad + LCD panel for machine parameter configuration with audible feedback and real-time clock display. IC Role / Device Role / Timing Role: Integrated beep generator and RTC in MCC provide tone alerts and timestamping without external components. Use Value: Eliminates separate beeper driver and RTC IC, reducing PCB area by 28 mm² and component count by 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324K4B5 | Same core and peripherals, but in SDIP32 (400 mil) package - larger footprint, through-hole mounting. | Preferred for prototyping or legacy board rework where TQFP reflow is unavailable. | Select when mechanical compatibility with existing SDIP sockets or wave-solder assembly is required. |
| STM8S003F3P6 | Successor 8-bit MCU with enhanced ADC (10-bit, 5 Msps), higher clock (16 MHz), and improved ESD rating (4 kV HBM). | Better suited for new designs requiring higher sampling rates or extended lifecycle support (active production beyond 2030). | Choose for new designs needing longer availability, lower active current (190 µA/MHz), or integrated EEPROM. |
Compared with ST72F324J4B5, the K4B5 variant offers identical functionality in a through-hole package for legacy manufacturing, while the STM8S003F3P6 delivers superior performance, modern toolchain support, and extended longevity - making it the recommended upgrade path for new projects.
Availability
ST72F324J4B5 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable logic relays, and industrial HMI panels requiring stable component supply and long-term obsolescence management.
Supply support for ST72F324J4B5 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 automotive, industrial, and consumer markets.
The ST7 family was engineered for cost-sensitive, high-reliability embedded control in harsh environments - emphasizing low-power operation, robust I/O, and field-programmable Flash for industrial automation and appliance applications.
FAQ
Is ST72F324J4B5 still in active production?
No - ST72F324J4B5 is marked "Not for New Design" per ST's April 2008 datasheet revision. It remains available through authorized distributors and Aetrix Electronics' legacy inventory, with full traceability and extended lifecycle support for existing production programs.
What debug interfaces does ST72F324J4B5 support?
It supports single-wire in-circuit debugging via the ICC (In-Circuit Communication) interface using the dedicated ICCSEL/VPP pin. No JTAG or SWD is available; development relies on ST's STVP software and compatible ICC programmers like the ST-LINK adapter with ICC firmware.
Can the 10-bit ADC operate during low-power modes?
Yes - the ADC can perform conversions in Wait and Active-Halt modes, but not in Halt or Slow modes. In Wait mode, the CPU halts while peripherals (including ADC) remain clocked; conversion results trigger interrupts to resume execution.
What is the maximum operating frequency with internal RC oscillator?
The internal RC oscillator runs at 8 MHz ±10% over temperature and voltage. When combined with the PLL (2× multiplication), it achieves 16 MHz system clock - sufficient for 1 µs instruction cycles and 20 kHz PWM resolution with 16-bit timers.
ST72F324J4B5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 42-DIP (0.600", 15.24mm)
- Series:
- ST7
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ST7
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 3.8V ~ 5.5V
- Data Converters:
- A/D 12x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -10°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
ST72F324J4B5 FAQ
1.How can I place an order for ST72F324J4B5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324J4B5 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 ST72F324J4B5 reliable?
The price and inventory of ST72F324J4B5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324J4B5 is usually 5 days.
3.What payment methods are accepted for ST72F324J4B5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324J4B5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324J4B5?
ST72F324J4B5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324J4B5 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 ST72F324J4B5?
For technical support, including ST72F324J4B5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324J4B5 requirements.
6.How does Aetrix verify that ST72F324J4B5 is sourced from the original manufacturer or authorized distributors?
All ST72F324J4B5 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 ST72F324J4B5 meets industry standards.
7.What is the process for return or replacement of ST72F324J4B5?
All ST72F324J4B5 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324J4B5, 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 ST72F324J4B5 part is unused and in its original packaging.
Return procedure for ST72F324J4B5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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