ATMEGA324P-A15MZ - 8-Bit AVR MCU 16MHz 32KB Flash | Microchip
MPN: ATMEGA324P-A15MZ β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.3 | $230.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.85 | $1,850.00 |
ATMEGA324P-A15MZ Overview
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die, sitting at the center of the embedded systems hierarchy between discrete logic and full application processors. The ATmega family belongs to the AVR 8-bit RISC line, one of the most widely deployed microcontroller architectures in industrial, automotive, and consumer electronics.
Key features of the ATMEGA324P-A15MZ include the Advanced RISC architecture with 131 powerful instructions, most executing in a single clock cycle, and 32 general-purpose working registers directly connected to the ALU for maximum code efficiency. The 'P' suffix denotes the picoPower class with low active and sleep current consumption, while the 'A' grade and automotive-grade suffix indicate extended qualification for demanding environments, per FindIC automotive classification.
On-chip peripherals include two 8-bit timers, 16-bit timers with input capture and PWM output compare channels, a 10-bit ADC with multiplexed single-ended and differential inputs, USART serial ports, two-wire interface (TWI/I2C), SPI, an analog comparator, and programmable watchdog timer with separate on-chip oscillator. Read-while-write ISP FLASH allows in-system firmware updates without removing the device from the board.
Typical applications span automotive body electronics and sensors, industrial control and motor-driven systems, building automation, consumer appliances, and battery-powered instrumentation where the picoPower sleep modes extend operating life.
For design, note the 4.5V to 5.5V supply range: at the 16MHz grade the device is 5V-only, so level shifting is required for 3.3V peripherals, and the VQFN exposed pad should be soldered to a grounded copper pour for both thermal and EMC performance.
This page synthesizes distributor pricing context, verified drop-in alternatives within the same 44-VQFN footprint, and practical engineering design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATMEGA324P-A15MZ β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA324P-A15MZ (same form factor and footprint) β differing in EEPROM, Package, SRAM, ADC, Core Architecture.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA324P-20MQ
β Drop-Inβ In Stock
$4.15 / Unit
View Datasheet βATMEGA324P-B15AZ
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA324P-15MT
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA164P-A15MZ
β Drop-Inβ In Stock
$1.58 / Unit
View Datasheet βATMEGA324PA-A15MZ
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA324P-A15MZ Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Core Size | 8-Bit |
| Max Clock Frequency | 16 MHz |
| Flash Memory | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| I/O Count | 32 |
| Instructions | 131 (mostly single-cycle) |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Package | 44-VQFN (7x7 mm), exposed pad |
| Mounting Type | Surface Mount |
| Product Grade | Automotive (per FindIC classification) |
| ISP Support | Yes (read-while-write Flash) |
| Timers | 2x 8-bit, 1x 16-bit with PWM |
| ADC | 10-bit, multiplexed single-ended and differential |
| Communication Interfaces | USART, SPI, TWI (I2C-compatible) |
| Power Class | picoPower |
| Life Cycle Stage | Active |
ATMEGA324P-A15MZ 44-vqfn (7x7 mm), exposed pad Pin Configuration Guide
Pin configuration for ATMEGA324P-A15MZ (44-vqfn (7x7 mm), exposed pad package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATMEGA324P-A15MZ.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA324P-A15MZ is suitable for 6 applications: Automotive Body Electronics, Industrial Control and Automation, Building Automation and HVAC, Consumer Appliances, Sensor and Data Acquisition Nodes, Portable and Battery-Powered Instrumentation.
Automotive Body Electronics
The ATMEGA324P-A15MZ fits automotive body-control nodes such as door modules, seat controllers, lighting units, and sensor hubs. FindIC classifies the part as 'Automotive 44Pin QFN EP', confirming its qualification for vehicle environments, and the 4.5V to 5.5V supply tolerates 5V automotive rail transients with external protection. Its 32 GPIO lines drive relays, LEDs, and switches directly, while the 10-bit ADC reads analog sensor inputs such as position potentiometers and temperature sensors. The exposed-pad VQFN (7x7) provides low thermal resistance and improved EMC, important for passing automotive electromagnetic compatibility requirements. The 32KB FLASH accommodates diagnostic code, UDS/K-Line style communication stacks, and NVM calibration tables stored in the 1KB EEPROM. Designers should budget brown-out detection and watchdog usage for safety-relevant functions.
Recommended
Industrial Control and Automation
In PLC-lite controllers, motor drive supervision, pump management, and factory sensor nodes, the ATMEGA324P-A15MZ offers a 16MHz AVR core delivering roughly 16 MIPS, sufficient for PID loops and state machines with deterministic timing. The two 8-bit timers and 16-bit timer with PWM output-compare channels generate motor PWM directly, while the 10-bit ADC with differential inputs reads current-shunt signals for load monitoring. Its 4.5V to 5.5V supply range matches industrial 5V logic rails, and the 1KB EEPROM stores configuration and wear-leveled counters through power cycles. The TWI and SPI interfaces connect HMIs, real-time clocks, and isolated transceivers. The exposed-pad QFN dissipates heat reliably in sealed enclosures, and the 32KB FLASH leaves headroom for field-updatable firmware via ISP read-while-write programming.
Recommended
Building Automation and HVAC
Thermostats, damper controllers, and room occupancy nodes benefit from the ATMEGA324P-A15MZ's peripheral mix: the TWI/I2C bus connects temperature, humidity, and pressure sensors; the USART interfaces with RS-485 transceivers for BACnet-style or Modbus RTU fieldbus links; and the 10-bit ADC reads potentiometer setpoints. The 32KB FLASH holds protocol stacks and LCD driver code, while the 1KB EEPROM retains schedule tables and calibration data without external memory. The 5V supply simplifies interfacing with legacy building wiring optocouplers and relay drivers, and the picoPower idle modes trim standby consumption in always-on wall units. The 44-VQFN (7x7) footprint with exposed ground pad meets the thermal and EMC expectations of plastic-housed wall-mounted products, and ISP programming permits firmware updates during commissioning without desoldering.
Recommended
Consumer Appliances
Washers, ovens, coffee machines, and small appliance control boards use the ATMEGA324P-A15MZ to orchestrate user interfaces and actuator sequencing. The 32 GPIO drive seven-segment displays, keypads, triacs via optocouplers, and relay banks; the 16MHz core performs AC zero-cross timing and touch/encoder decoding with microsecond resolution. The 1KB EEPROM stores user preferences and usage counters, and the 32KB FLASH supports localization strings and multi-language menus. The device's 4.5V to 5.5V supply pairs with cheap linear regulators from rectified mains-derived rails, and the VQFN exposed pad bonds to the control-board ground pour, containing switching noise from relays and triac loads. The picoPower process keeps consumption low in standby clock modes, contributing to energy-label compliance, while watchdog supervision ensures recovery from mains-borne disturbances.
Recommended
Sensor and Data Acquisition Nodes
Distributed sensing nodes for temperature, pressure, vibration, and current use the ATMEGA324P-A15MZ's 10-bit ADC with differential input pairs and internal reference to digitize bridge and ratiometric sensors. The differential mode with programmable gain rejects common-mode noise in electrically noisy cabinets, and the analog comparator provides fast over-limit detection independent of software loops. Acquired data transmits over USART or SPI to RS-485, radio, or logging modules, while the 2KB SRAM buffers burst samples. The 32KB FLASH runs calibration and filtering code with headroom, and the 1KB EEPROM preserves factory calibration coefficients across power cycles. The 5V operation suits long cable runs where 3.3V signaling is marginal, and the QFN exposed pad anchors the ground plane for low-noise analog layout on mixed-signal boards.
Recommended
Portable and Battery-Powered Instrumentation
Handheld meters, portable testers, and logging instruments leverage the ATmega324P's picoPower sleep architecture: idle, power-down, and power-save modes drop standby current to microamp levels so battery life is dominated by sensing and display activity rather than the MCU. The 16MHz full-speed mode handles burst computation, then the asynchronous timer keeps time-of-day in power-save mode between measurements. The 10-bit ADC samples the measured channel, the 1KB EEPROM stores min/max logs, and the USART or SPI feeds displays and wireless modules. Designers should note the 4.5V to 5.5V supply: typical implementations use four alkaline/NiMH cells or a boost converter to hold regulation, or step down to a 3V-graded part variant for single-liion designs. The exposed-pad QFN improves thermal relief during continuous ADC or backlight-driven duty cycles.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA324P-A15MZ β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA324P-20MQ | ATMEGA324P-B15AZ | ATMEGA324P-15MT | ATMEGA164P-A15MZ | ATMEGA324PA-A15MZ |
|---|---|---|---|---|---|---|
| Package | 44-VQFN (7x7 mm) EP | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same | 44-VQFN (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 1 KB | 2 KB |
| Max Clock Frequency | 16 MHz | 20 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 1.8 V to 5.5 V (wider) |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 512 B | 1 KB |
| Product Grade | Automotive (A grade) | Automotive (20MHz grade) | Automotive (B grade) | Industrial/consumer | Automotive (A grade) | Industrial/consumer picoPower |
Key Differentiators
- Automotive A-grade qualification in 5V QFN (vs ATMEGA324P-15MT)
- Full 32KB FLASH at 16MHz 5V operation (vs ATMEGA164P-A15MZ)
- Balanced speed/supply compromise vs 20MHz grade (vs ATMEGA324P-20MQ)
Design Notes
The ATMEGA324P-A15MZ is a 5V-only device at its 16MHz rating: the datasheet specifies 4.5V to 5.5V for this speed grade. Do not attempt 3.3V operation at 16MHz; either add level shifters for 3.3V peripherals or select a lower-speed/wider-voltage variant such as the ATmega324PA for mixed-voltage systems. Fit a 100nF ceramic decoupling capacitor at each supply pin pair plus a 10uF bulk capacitor, and use the internal brown-out detector (set above 4.3V) so EEPROM writes abort cleanly during brown-out events rather than corrupting nonvolatile data.
The 44-VQFN (7x7) exposed pad must be soldered to a PCB ground pour, not left floating. Define a 3x3 or 4x4 via array (0.3mm vias) under the pad to the internal ground plane to reduce junction temperature and provide the low-inductance ground return the AVR's fast edges require. For assembly, verify your stencil design opens 50-70% pad coverage on the exposed pad to prevent voiding. Per Microchip QFN assembly guidance, use NSMD pads and confirm the land pattern matches the manufacturer datasheet footprint before panel qualification.
Confirm firmware memory budget before cross-grading: the ATMEGA164P-A15MZ shares this pinout but has only 16KB FLASH and 1KB SRAM, so 32KB-class binaries will not link. Also, do not confuse ATmega324P with ATmega324PA power figures - the PA revision has different current consumption tables and slightly different errata. When using ISP programming, keep the SPI bus (PB5/PB6/PB7) free of loads that fight the programmer, and hold RESET low during power-up if the application drives it, per the Microchip programming interface specification.
Compliance Information
FindIC classifies the part as automotive grade; specific RoHS/REACH/lead-free certification for this exact ordering code was not stated verbatim in the verified web data - confirm via Microchip compliance documents for ATMEGA324P-A15MZ.
