My Inquiry
My Account
STMicroelectronics ST72F324J4B6
- Part No.:
- ST72F324J4B6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 42-DIP (0.600", 15.24mm)
- Datasheet:
-
ST72F324J4B6.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 42DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,297
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ST72F324J4B6 from STMicroelectronics is an 8-bit microcontroller featuring 8 KB Flash memory, 384 bytes RAM, 10-bit ADC with up to 12 input channels, dual 16-bit timers (Timer A and Timer B), SPI and SCI serial interfaces, and four power-saving modes. 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 sensor interface modules.
For engineers reviewing the ST72F324J4B6 datasheet, ST72F324J4B6 pinout, ST72F324J4B6 application, or ST72F324J4B6 equivalent, this MCU delivers deterministic real-time control with nested interrupt handling (10 vectors), programmable low-voltage detection, and in-application programming capability for field firmware updates.
Technical Context
The ST72F324J4B6 implements the ST7 core with 63 basic instructions and 17 addressing modes, including 8×8 unsigned multiply. Its clock system integrates a PLL for 2× frequency multiplication, internal RC oscillator, crystal/ceramic resonator support, and clock security system with bypass mode.
Peripheral integration includes a Main Clock Controller with real-time base, beep generator, and clock-out function; configurable watchdog timer; and low-current-coupled 10-bit ADC optimized for noise immunity in industrial signal acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | ST7 8-bit CISC CPU with 63 instructions and 17 addressing modes |
| Flash Memory | 8 KB HD-Flash with read-out protection, 100 write/erase cycles, 20-year data retention at 55°C |
| RAM | 384 bytes (including 256-byte stack), volatile data storage for variables and context |
| ADC Resolution | 10-bit successive approximation ADC with up to 12 robust analog inputs |
| Timers | Two 16-bit timers: Timer A (1 capture/1 compare/PWM), Timer B (2 capture/2 compare/PWM) |
| Communication | SPI synchronous interface and SCI asynchronous UART-compatible interface |
| Supply Range | 3.8 V to 5.5 V operation, compatible with standard 5 V logic systems |
| Temperature Range | −40°C to +125°C ambient, qualified for under-hood automotive and industrial environments |
Pinout & Package
TQFP44 (10 mm × 10 mm, 0.8 mm pitch) package with 44 leads; pin functions validated per STMicroelectronics datasheet Rev. 5 (April 2008), Section 2 "Pin Description".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main power supply | Primary 3.8–5.5 V supply rail for core and I/O |
| VSS | Ground reference | Digital ground return path for all internal circuits |
| RESET | Asynchronous reset input | Active-low hardware reset with internal pull-up; initiates cold boot sequence |
| OSCIN / OSCOUT | Crystal/resonator interface | Differential input/output for external 1–8 MHz crystal or ceramic resonator |
| PA0–PA7 | Port A bidirectional I/O | 8-bit multifunction port supporting alternate functions including ADC inputs and timer channels |
| PB0–PB7 | Port B bidirectional I/O | 8-bit port with high-sink capability (20 mA per pin), used for LED drivers or relay control |
| PC0–PC7 | Port C bidirectional I/O | 8-bit port supporting SPI (PC0–PC2) and SCI (PC3–PC4) peripheral mapping |
| PD0–PD7 | Port D bidirectional I/O | 8-bit port with 22 alternate function lines shared across timers, ADC, and interrupts |
| ICCSEL/VPP | In-circuit programming control | Selects ICC programming mode or provides VPP voltage during Flash programming |
Key Features
| Feature | Design Value |
|---|---|
| In-Application Programming (IAP) | Enables firmware updates via running application without external programmer |
| Enhanced Low Voltage Detector (LVD) | Programmable reset thresholds with interrupt capability for brown-out recovery |
| Nested Interrupt Controller | Supports prioritized, reentrant interrupt handling across 10 vectors plus TRAP/RESET |
| Four Power-Saving Modes | Halt, Active-Halt, Wait, and Slow modes reduce current to ≤1.5 µA (Halt) for battery longevity |
| Real-Time Base & Beeper | Integrated RTC functionality and tone generation using main clock controller, no external components required |
Applications
| Motor Control Interface | Sensor Signal Acquisition |
|---|---|
Use Scenario: Brushless DC motor commutation in HVAC blowers and industrial fans. IC Role / Device Role / Timing Role: Real-time PWM generation, ADC sampling of current/voltage feedback, and closed-loop timing via Timer A/B. Use Value: Precise 10-bit current sensing enables torque ripple reduction; dual timers synchronize gate drive signals with <1 µs jitter. |
Use Scenario: Multi-channel environmental monitoring in smart building controllers. IC Role / Device Role / Timing Role: Simultaneous sampling of temperature, humidity, and CO₂ analog sensors via 12-channel ADC. Use Value: Low-current coupling and programmable sampling rate minimize sensor loading and enable 12-bit effective resolution through oversampling. |
| Industrial Serial Gateway | Embedded Power Supply Monitor |
Use Scenario: Protocol translation between Modbus RTU (SCI) and SPI-connected slave devices in PLC backplanes. IC Role / Device Role / Timing Role: SCI UART handles RS-485 framing; SPI master controls isolated I/O expanders and EEPROM. Use Value: Hardware SCI framing and SPI shift register reduce CPU overhead by >40% versus bit-banged alternatives. |
Use Scenario: Monitoring rail voltages and thermal shutdown in telecom power modules. IC Role / Device Role / Timing Role: LVD and AVD monitor primary/auxiliary supplies; generate interrupts on threshold crossing. Use Value: Programmable LVD thresholds (4.0 V / 4.3 V / 4.6 V) allow precise brown-out response without external supervisor IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST72F324K4B6 | Same core and peripherals, but SDIP42 package (600 mil) instead of TQFP44 | Preferred for through-hole prototyping or legacy PCBs requiring DIP footprint | Select when mechanical compatibility with existing SDIP layouts is required |
| STM8S003F3P6 | Newer STM8 core, 8 KB Flash, 1 KB RAM, enhanced debug (SWIM), no LVD interrupt capability | Better code density and lower active current; lacks auxiliary voltage detector (AVD) interrupt | Choose for new designs needing higher reliability and toolchain support; not drop-in compatible |
Compared with ST72F324J4B6, the K4B6 variant offers identical electrical behavior in a through-hole package, while the STM8S003F3P6 provides modern tooling and lower power but requires firmware porting and lacks AVD-triggered interrupts.
Availability
ST72F324J4B6 is available at Aetrix Electronics and suitable for motor control interface, sensor signal acquisition, industrial serial gateway, and embedded power supply monitor applications requiring stable component supply across extended temperature ranges.
Supply support for ST72F324J4B6 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 management ICs, and sensors for industrial, automotive, and consumer markets.
The ST7 family was engineered for cost-sensitive, real-time embedded control applications demanding deterministic interrupt latency, low-power operation, and robust analog integration - especially where Flash programmability and wide temperature tolerance are critical.
FAQ
Is ST72F324J4B6 still recommended for new designs?
No - STMicroelectronics explicitly marks this device as "NOT FOR NEW DESIGN" in the April 2008 datasheet. It has been superseded by the STM8S series, which offers improved performance, lower power, and ongoing toolchain support. Aetrix Electronics maintains legacy supply for repair and continuity, but design-in guidance strongly favors STM8S003F3P6 or STM8L051F3P6 for new projects.
What programming interfaces does ST72F324J4B6 support?
The device supports In-Circuit Programming (ICP) via the ICC interface using the ICCSEL/VPP pin and standard SWIM protocol-compatible programmers. It also enables In-Application Programming (IAP) through user firmware that writes to Flash using the built-in bootloader routines - no external debugger required for field updates.
Does ST72F324J4B6 include hardware UART support?
Yes - it integrates a Serial Communications Interface (SCI) peripheral that implements full-duplex asynchronous communication with programmable baud rate, parity, stop bits, and framing error detection. The SCI maps to Port C pins (PC3/PC4) and supports both polling and interrupt-driven operation.
Can ST72F324J4B6 operate reliably at 125°C ambient?
Yes - the device is fully specified and tested for operation from −40°C to +125°C ambient temperature per datasheet Section 12.3. This includes validated Flash endurance, ADC linearity, and I/O drive strength at maximum junction temperature, making it suitable for under-hood automotive and industrial power electronics applications.
ST72F324J4B6 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
ST72F324J4B6 FAQ
1.How can I place an order for ST72F324J4B6 through Aetrix?
Please submit a Request for Quotation (RFQ) for ST72F324J4B6 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 ST72F324J4B6 reliable?
The price and inventory of ST72F324J4B6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST72F324J4B6 is usually 5 days.
3.What payment methods are accepted for ST72F324J4B6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST72F324J4B6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST72F324J4B6?
ST72F324J4B6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST72F324J4B6 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 ST72F324J4B6?
For technical support, including ST72F324J4B6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST72F324J4B6 requirements.
6.How does Aetrix verify that ST72F324J4B6 is sourced from the original manufacturer or authorized distributors?
All ST72F324J4B6 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 ST72F324J4B6 meets industry standards.
7.What is the process for return or replacement of ST72F324J4B6?
All ST72F324J4B6 units undergo pre-shipment inspection (PSI). If there is an issue with ST72F324J4B6, 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 ST72F324J4B6 part is unused and in its original packaging.
Return procedure for ST72F324J4B6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST72F324J4B6 Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
