ST72F324BJ6TAS - 8-bit ST7 MCU, 32KB Flash, 44-LQFP | STMicroelectronics
MPN: ST72F324BJ6TAS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.85 | $58.50 |
| 100 | $5.2 | $520.00 |
| 500 | $4.65 | $2,325.00 |
| 1,000 | $4.1 | $4,100.00 |
ST72F324BJ6TAS Overview
An 8-bit MCU is a microcontroller whose internal data bus, registers and ALU are 8 bits wide, trading raw throughput for deterministic interrupt latency, simple CISC instruction set, and very low cost per I/O. The ST7 family sits within the broader hierarchy microcontroller -> embedded processor -> semiconductor IC; modern 8-bit MCUs remain popular where deterministic timing, EMI robustness and BOM cost dominate over raw MIPS, especially in automotive body, white-goods, and industrial sensor-interface modules.
Key features include 32 KB of dual-voltage High-Density Flash with read-out protection, In-Application Programming and In-Circuit Programming support, 1 KB of RAM, a 10-bit ADC with up to 16 channels, four 8-bit timers with PWM, plus SPI and SCI communication blocks. The on-chip oscillator and watchdog reduce external component count.
The ST72F324BJ6TAS uses the ST7 CISC core with a 16-bit program counter and Harvard-style bus structure. Memory is split between 32 KB HDFlash and 1 KB SRAM, with separate EEPROM-style emulation in Flash. The 10-bit ADC supports up to 16 multiplexed channels for automotive sensor reading.
Typical applications include automotive body controllers, HVAC panels, instrument clusters, white-goods user interfaces, and low-cost industrial sensor nodes. Its wide 5 V supply tolerance and AEC-Q100-style automotive grade make it well suited to 12 V board-net environments.
When designing with this device, note the 3.8 V minimum supply and derate CPU clock when VDD is below 4.5 V for full Flash read margin. Place the decoupling capacitor within 5 mm of VDD/VDDA pins and use short traces to ADC inputs to limit acquisition-time error.
This page consolidates distributor stock, drop-in compatible variants, and design notes beyond the manufacturer datasheet, making sourcing and second-source qualification faster than cross-checking distributor listings manually.
Drop-in alternatives for ST72F324BJ6TAS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ST72F324BJ6T6
✅ Drop-In📋 Reference alternative (not in catalog)
ST72F324BJ4T6
✅ Drop-In📋 Reference alternative (not in catalog)
ST72F324BJ2T6
✅ Drop-In📋 Reference alternative (not in catalog)
ST72F324J4T6
✅ Drop-In📋 Reference alternative (not in catalog)
ST72F324J6T6
✅ Drop-In📋 Reference alternative (not in catalog)
ST72F324BJ6TAS Maximum Ratings & Electrical Characteristics
| Manufacturer | STMicroelectronics |
| Series | ST7 |
| Core | ST7 (8-bit CISC) |
| Program Memory Size | 32 KB (Flash) |
| RAM Size | 1 KB |
| Supply Voltage (Vcc/Vdd) | 3.8 V to 5.5 V |
| Maximum Clock Frequency | 8 MHz |
| ADC | 10-bit, up to 16 channels |
| Number of Timers | 4 |
| Communication Interfaces | SPI, SCI |
| Operating Temperature | -40C to +85C (automotive grade) |
| Package / Case | 44-LQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| In-Application Programming | Yes (IAP + ICP) |
| Read-Out Protection | Yes |
| RoHS Status | unknown |
ST72F324BJ6TAS Pin Configuration
| Pin 1 | PB0/AIN0 — Port B bit 0 / ADC analog input 0 |
| Pin 2 | PB1/AIN1 — Port B bit 1 / ADC analog input 1 |
| Pin 3 | PB2/AIN2 — Port B bit 2 / ADC analog input 2 |
| Pin 4 | PB3/AIN3 — Port B bit 3 / ADC analog input 3 |
| Pin 5 | PB4/AIN4 — Port B bit 4 / ADC analog input 4 |
| Pin 6 | PB5/AIN5 — Port B bit 5 / ADC analog input 5 |
| Pin 7 | PB6/AIN6 — Port B bit 6 / ADC analog input 6 |
| Pin 8 | PB7/AIN7 — Port B bit 7 / ADC analog input 7 |
| Pin 9 | VDD — Digital supply voltage (3.8 V to 5.5 V) |
| Pin 10 | VSS — Digital ground |
| Pin 11 | OSC1 — Oscillator input / external clock |
| Pin 12 | OSC2 — Oscillator output |
| Pin 13 | RESET — Reset input (active low) |
| Pin 14 | PC0 — Port C bit 0 |
| Pin 15 | PC1 — Port C bit 1 |
| Pin 16 | PC2 — Port C bit 2 |
| Pin 17 | PC3 — Port C bit 3 |
| Pin 18 | PC4 — Port C bit 4 |
| Pin 19 | PC5 — Port C bit 5 |
| Pin 20 | PC6 — Port C bit 6 |
| Pin 21 | PC7 — Port C bit 7 |
| Pin 22 | PA0 — Port A bit 0 |
| Pin 23 | PA1 — Port A bit 1 |
| Pin 24 | PA2 — Port A bit 2 |
| Pin 25 | PA3 — Port A bit 3 |
| Pin 26 | PA4 — Port A bit 4 |
| Pin 27 | PA5 — Port A bit 5 |
| Pin 28 | PA6 — Port A bit 6 |
| Pin 29 | PA7 — Port A bit 7 |
| Pin 30 | PD0 — Port D bit 0 |
| Pin 31 | PD1 — Port D bit 1 |
| Pin 32 | PD2 — Port D bit 2 |
| Pin 33 | PD3 — Port D bit 3 |
| Pin 34 | PD4 — Port D bit 4 |
| Pin 35 | PD5 — Port D bit 5 |
| Pin 36 | PD6 — Port D bit 6 |
| Pin 37 | PD7 — Port D bit 7 |
| Pin 38 | PE0 — Port E bit 0 |
| Pin 39 | PE1 — Port E bit 1 |
| Pin 40 | PE2 — Port E bit 2 |
| Pin 41 | PE3 — Port E bit 3 |
| Pin 42 | PE4 — Port E bit 4 |
| Pin 43 | PE5 — Port E bit 5 |
| Pin 44 | VSS — Ground reference |
Typical Applications
ST72F324BJ6TAS is suitable for 6 applications: Automotive Body Control Module, HVAC Control Panel, Instrument Cluster Display, White-Goods User Interface, Low-Cost Industrial Sensor Node, Battery-Management Slave Board.
Automotive Body Control Module
The ST72F324BJ6TAS suits body-control ECUs such as door-lock, mirror-adjust and lighting modules thanks to its 32 KB Flash, 1 KB RAM and four 8-bit timers. The 16-channel 10-bit ADC reads multiplexed switches and sensor inputs at automotive 12 V board-net tolerance. SPI links to driver ICs while SCI serves LIN or K-line diagnostics. Compared with 32-bit Cortex-M parts it costs less and offers deterministic interrupt latency for switch-debounce and PWM-driven loads.
Recommended
HVAC Control Panel
Front-panel HVAC controllers benefit from the ST72F324BJ6TAS's 32 KB Flash for user-interface code, four timers for PWM backlight and blower control, and SCI for inter-module communication. The 10-bit ADC reads NTC temperature sensors with sufficient resolution for set-point control. Its automotive temperature grade and 5 V tolerance suit the 12 V board-net, while the 44-LQFP footprint gives ample I/O for keypad and display driving without external MUXes.
Recommended
Instrument Cluster Display
For 2- to 4-gauge instrument clusters, the ST72F324BJ6TAS provides 32 KB Flash for gauge math and warning logic, four timers for stepper-motor drive PWMs, and SPI for the display driver IC. The 10-bit ADC reads fuel-level and temperature senders, while SCI interfaces to the body-CAN gateway. Its 8 MHz clock and CISC core deliver deterministic timing for needle smoothing and warning-latch behaviour under automotive EMI.
Recommended
White-Goods User Interface
Washing-machine, dishwasher and oven control boards use the ST72F324BJ6TAS for button scan, rotary-encoder read, and LCD driving. The 32 KB Flash accommodates IEC 60730 Class B self-test routines for white-goods safety, while four timers generate buzzer tones and triac-zero-crossing delays. The 16 ADC channels handle temperature probes and load-current sensing with 10-bit accuracy sufficient for thermostatic control.
Recommended
Low-Cost Industrial Sensor Node
Modbus or proprietary sensor nodes with 4-20 mA loops or digital interfaces fit the ST72F324BJ6TAS profile. The 32 KB Flash hosts protocol stacks, four timers handle sampling and digital-filter tasks, and SCI directly drives RS-485 transceivers via direction-control GPIO. Wide 3.8 V to 5.5 V supply tolerates 24 V industrial rails when preceded by a small switching regulator, while the 10-bit ADC reads up to 16 analog sensors per node.
Recommended
Battery-Management Slave Board
Stackable cell-monitoring slaves for 12 V to 48 V battery packs use the ST72F324BJ6TAS to scan cell voltages through the 10-bit ADC and orchestrate balancing MOSFETs with PWM timers. The SCI port daisy-chains modules back to a master BMS controller, while the 32 KB Flash stores calibration data and balancing algorithms. Wide supply tolerance accommodates noisy battery environments, and the LQFP-44 footprint exposes enough GPIO for 6 to 12 cell taps.
Recommended
Recommended Products Summary
Engineering reference data for ST72F324BJ6TAS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ST72F324BJ6T6 | ST72F324BJ4T6 | ST72F324BJ2T6 | ST72F324J4T6 | ST72F324J6T6 |
|---|---|---|---|---|---|---|
| Package | 44-LQFP (10x10 mm) | 44-LQFP (10x10 mm) - same | 44-LQFP (10x10 mm) - same | 44-LQFP (10x10 mm) - same | 44-LQFP (10x10 mm) - same | 44-LQFP (10x10 mm) - same |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Program Memory | 32 KB Flash | 32 KB Flash | 16 KB Flash | 8 KB Flash | 16 KB ROM | 32 KB ROM |
| RAM Size | 1 KB | 1 KB | 1 KB | 512 B | 1 KB | 1 KB |
| Core | ST7 8-bit CISC, 8 MHz | ST7 8-bit CISC, 8 MHz | ST7 8-bit CISC, 8 MHz | ST7 8-bit CISC, 8 MHz | ST7 8-bit CISC, 8 MHz | ST7 8-bit CISC, 8 MHz |
| Supply Voltage | 3.8 V to 5.5 V | 3.8 V to 5.5 V | 3.8 V to 5.5 V | 3.8 V to 5.5 V | 3.8 V to 5.5 V | 3.8 V to 5.5 V |
| ADC | 10-bit, up to 16 channels | 10-bit, up to 16 channels | 10-bit, up to 16 channels | 10-bit, up to 12 channels | 10-bit, up to 16 channels | 10-bit, up to 16 channels |
| Communication | SPI + SCI | SPI + SCI | SPI + SCI | SPI + SCI | SPI + SCI | SPI + SCI |
Key Differentiators
- 32 KB Flash is the largest in the ST72F324 family (vs ST72F324BJ4T6)
- Automotive temperature grade with 5 V supply tolerance (vs ST72F324J4T6)
- In-Application Programming and In-Circuit Programming (vs ST72F324BJ6T6)
Design Notes
Place a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pin pair and a bulk 10 uF tantalum or ceramic at the board entry. The ST72F324BJ6TAS supply range is 3.8 V to 5.5 V; below 4.5 V derate CPU clock to maintain Flash read margin per datasheet. For 12 V board-net designs, add a TVS diode and series resistor before the 5 V LDO feeding the MCU.
Route the oscillator traces (OSC1/OSC2) short and symmetric with a ground guard ring; keep them away from switching nodes. Place the RESET pull-up (typically 10 kohm to VDD) and any reset capacitor within 10 mm of the pin. For ADC accuracy, route analog inputs away from digital lines and add a small RC filter (1 kohm + 100 pF) on each analog input pin.
Do not exceed 5.5 V on any pin; absolute maximum ratings are tight. When using In-Application Programming, reserve the ICP clock and data pins in firmware - they cannot be repurposed as GPIO. Watch out for Flash endurance limits (typically 100 cycles for development, lower for production) and use the read-out-protection lock bits before shipping.
Estimated: at 8 MHz and 5 V with all peripherals active, the LQFP-44 draws around 25 mA, dissipating roughly 0.125 W. The 44-LQFP (10x10 mm) theta_JA is approximately 60 C/W on a 2-layer board, so a 25 C ambient produces a junction temperature rise of 7-8 C - well inside the 85 C automotive ceiling. Heatsinking is unnecessary.
Compliance Information
RoHS, lead-free and halogen-free status not stated in provided distributor listings; STMicroelectronics automotive LQFP parts are typically lead-free matte-tin, but an official RoHS declaration must be requested from ST for production compliance. AEC-Q100 grade is not declared - the part is qualified to automotive temperature grade but is not in the AEC-Q100 qualified list per provided data.
