ATMEGA324P-15MT - 8-bit AVR MCU 16MHz 32KB Flash VQFN-44 | Microchip
MPN: ATMEGA324P-15MT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.16 | $41.60 |
| 100 | $3.71 | $371.00 |
| 500 | $3.34 | $1,670.00 |
| 1,000 | $2.97 | $2,970.00 |
ATMEGA324P-15MT Overview
An 8-bit AVR microcontroller is a single-chip computer that integrates a RISC processor core, program memory, data memory, timers, serial peripherals, and analog converters on one die. Within the semiconductor hierarchy it belongs to the microcontroller (MCU) family: processor core, then microcontroller, then embedded system-on-chip. MCUs run the firmware that controls everything from household appliances to industrial sensors, executing deterministic real-time code with low power consumption.
The ATMEGA324P is built on the Advanced RISC Architecture with 131 powerful instructions, most executing in a single clock cycle, plus 32 general purpose working registers that are directly connected to the arithmetic logic unit. picoPower technology enables aggressive sleep modes, with the real-time counter running independently to support battery-powered designs. Peripherals include three flexible timer/counters with compare modes and PWM, two USARTs, a byte-oriented Two-Wire serial interface (I2C-compatible), an SPI interface, and an 8-channel 10-bit ADC.
In-system programmable (ISP) Flash with read-while-write capability allows firmware updates in the field without removing the device. The 16 MHz maximum clock, internal oscillator option, and wide operating voltage range make the part suitable for both cost-optimized and low-power designs.
Typical applications include industrial sensor nodes, HVAC and building automation, consumer appliances, motor control using timer PWM outputs, and battery-powered metering products where the picoPower sleep currents extend battery life.
A key design consideration: VQFN packages require a well-defined PCB land pattern and adequate thermal via stitching under the exposed pad for reliable soldering and ground return.
This page synthesizes distributor availability data, drop-in alternatives within the AVR ATmega family, and practical design guidance not found in the manufacturer datasheet. Pricing references are as of 2026-09-17.
Drop-in alternatives for ATMEGA324P-15MT — 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-15MT (same form factor and footprint) — differing in Flash Memory, EEPROM, Package, SRAM, Number of I/O.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA324PA-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.05 / Unit
View Datasheet →ATMEGA324PB-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.35 / Unit
View Datasheet →ATMEGA164PA-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$2.55 / Unit
View Datasheet →ATMEGA644PA-MU
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ATMEGA1284P-MU
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.1 / Unit
View Datasheet →ATMEGA324P-15MT Maximum Ratings & Electrical Characteristics
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 16 MHz |
| Program Memory Size | 32 KB (16K x 16) FLASH |
| EEPROM Size | 1 KB |
| RAM Size | 2 KB |
| Number of I/O | 32 |
| Number of USARTs | 2 |
| ADC Resolution | 10-bit |
| ADC Channels | 8 |
| Timers | Three timer/counters with compare modes and PWM |
| Serial Interfaces | 2x USART, TWI (I2C), SPI |
| Oscillator Type | Internal |
| Package / Case | 44-VQFN (7x7 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Program Memory Type | ISP FLASH, read-while-write |
| Technology Feature | picoPower low-power technology |
| Instruction Set | 131 instructions, RISC, mostly single-cycle |
ATMEGA324P-15MT 44-vqfn (7x7 mm) Pin Configuration Guide
Pin configuration for ATMEGA324P-15MT (44-vqfn (7x7 mm) 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-15MT.
Refer to the datasheet for full pin configuration.
Typical Applications
ATMEGA324P-15MT is suitable for 6 applications: Industrial Sensor Nodes, Building Automation and HVAC Control, Battery-Powered Metering, Motor Control and Fan Drivers, Consumer Appliance Control Boards, IoT Edge Devices and Gateways.
Industrial Sensor Nodes
The ATMEGA324P-15MT fits industrial sensor nodes because its 8-channel 10-bit ADC can read multiple analog sensors directly, its TWI and SPI interfaces connect digital sensors, and picoPower sleep modes minimize average current in battery or energy-harvesting installations. In a typical node, the MCU samples analog channels with the ADC noise-canceler mode, packages readings, and transmits them over USART0 to a radio module while USART1 remains available for local diagnostics. The 32 KB Flash provides headroom for sensor compensation tables and a field-updatable bootloader, and the read-while-write Flash allows logging calibration data to EEPROM without halting execution. The 16 MHz clock supports real-time filtering, while lower clock settings cut active current in duty-cycled designs.
Recommended
Building Automation and HVAC Control
In HVAC controllers and building automation panels, the ATMEGA324P-15MT provides the right mix of timers, analog inputs, and serial links. Its three flexible timer/counters generate PWM outputs for fan speed control and damper actuation, while the 10-bit ADC reads temperature sensors such as NTC thermistors ratiometrically against AVCC. The two independent USARTs allow one link to a BACnet/Modbus gateway (over RS-485 with an external transceiver) and a second to a service tool. The TWI interface reads humidity or pressure sensors over I2C. Because HVAC controllers run continuously, the internal watchdog and brown-out detector improve system robustness, and the 32 KB Flash accommodates PID control loops plus a communication protocol stack with room to spare.
Recommended
Battery-Powered Metering
Utility submeters and portable measurement instruments benefit from the ATMEGA324P-15MT's picoPower architecture. The power-down mode with an independently running real-time counter lets the device sleep between measurement intervals at very low current, extending battery life in products that must operate for years. Wake-up occurs on timer overflow or external interrupt, after which the ADC captures consumption pulses and the two USARTs (or TWI bus) communicate totals to a display or wireless module. The 1 KB EEPROM stores billing constants and accumulated counters across power interruptions, and the 32 KB Flash supports a secure bootloader for remote tariff updates. Running the clock at 1-2 MHz between transmissions further reduces active-mode energy versus full 16 MHz operation.
Recommended
Motor Control and Fan Drivers
The ATMEGA324P-15MT suits small motor control tasks such as DC fans, pumps, and servo drivers because its three timer/counters provide multiple hardware PWM channels with compare modes, enabling independent control of speed and direction outputs without CPU intervention. The fast ADC samples current shunt or back-EMF feedback for closed-loop speed regulation, and interrupt-driven pin-change inputs capture hall-sensor or encoder pulses. Two USARTs support command interfaces to a host controller or Modbus line. A typical topology uses an 8-bit PWM at 15-30 kHz from a 16 MHz clock to drive a MOSFET gate driver, with cycle-by-cycle current limiting implemented in an ADC interrupt. Dead-time generation and fault shutdown can be handled in firmware with deterministic single-cycle instruction timing.
Recommended
Consumer Appliance Control Boards
Washing machines, coffee makers, rice cookers, and similar appliances use the ATMEGA324P-15MT as a cost-effective main controller. Its 32 I/O lines drive seven-segment displays, relays, and triac triggers directly through appropriate drivers, while the 10-bit ADC reads temperature probes, water-level pressure sensors, and user potentiometers. The internal oscillator removes the cost of an external crystal in non-critical timing applications, reducing bill-of-materials cost. Two USARTs and TWI cover communication with display or inverter modules, and the 32 KB Flash holds state-machine logic, safety interlocks, and diagnostics. The AVR's brown-out detector and watchdog timer support the safety behavior expected in mains-connected appliance firmware, and the VQFN-44 package keeps PCB area compact in crowded control boards.
Recommended
IoT Edge Devices and Gateways
The ATMEGA324P-15MT serves as the sensor-side MCU in IoT edge products where a wireless module handles connectivity and a dependable, low-power MCU handles acquisition and control. One USART connects to a Wi-Fi, LoRa, or NB-IoT module using AT-command framing, while the second UART feeds a debug console. The SPI and TWI buses attach environmental sensors, and the ADC captures analog inputs such as battery voltage via a divider. The 32 KB Flash supports a bootloader that accepts OTA firmware pushed through the radio module, with read-while-write allowing the image to be written without stopping sensor sampling. picoPower sleep modes between uplink intervals keep average current within battery budgets, and the watchdog guarantees recovery from radio-module lockups.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA324P-15MT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA324PA-MU | ATMEGA324PB-MU | ATMEGA164PA-MU | ATMEGA644PA-MU | ATMEGA1284P-MU |
|---|---|---|---|---|---|---|
| Package | 44-VQFN (7x7 mm) | 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 | 16 KB | 64 KB | 128 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 1 KB | 4 KB | 16 KB |
| Max Clock Speed | 16 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| USARTs | 2 | 2 | 3 | 1 | 2 | 2 |
| ADC | 8-ch 10-bit | 8-ch 10-bit | 8-ch 10-bit | 8-ch 10-bit | 8-ch 10-bit | 8-ch 10-bit |
| Pin Compatibility with ATMEGA324P-15MT | Reference part | Pin-to-pin | Pin-to-pin | Pin-to-pin | Pin-to-pin (verify datasheet) | Pin-to-pin (verify datasheet) |
Key Differentiators
- Full 32 KB Flash in the pin-compatible VQFN-44 family (vs ATMEGA164PA-MU)
- picoPower technology for battery designs (vs ATMEGA324A (non-picoPower generation))
- Two USARTs in the base configuration (vs ATMEGA164PA-MU)
Design Notes
The 44-VQFN (7x7 mm) land pattern requires a 0.1 mm solder-paste stencil for the perimeter pads and a solid center thermal pad connected to the ground plane through an array of 4x4 or denser thermal vias (0.3 mm drill, plugged or tented). This improves both heat dissipation and ground return integrity for the ADC and USARTs. X-ray or angled AOI inspection is recommended after reflow because QFN solder joints are hidden under the package. Hand soldering this package is unreliable; use reflow profiles per Microchip packaging application notes.
Decouple VCC and AVCC independently: place 100 nF ceramic capacitors within 5 mm of each supply pin plus a 10 uF bulk capacitor near the IC. Connect AVCC to VCC through a low-pass RC filter (e.g., 10 ohm / 100 nF) when ADC accuracy matters, and keep the AREF pin decoupled with 100 nF when using the internal reference. Do not exceed the datasheet maximum VCC for the 16 MHz speed grade; verify the voltage-frequency curve in the ATmega324P datasheet before finalizing the supply rail.
The -15MT suffix ordering indicates the VQFN tape-and-reel variant; do not confuse it with -15AT (TQFP) when placing reel orders, as footprints are not interchangeable. Firmware ported between ATmega324P and ATmega324PB must account for changed register maps and peripheral counts in the PB. When using the internal oscillator for UART communication at 16 MHz, verify the oscillator tolerance against the baud-rate error budget; for long RS-485 lines a crystal is strongly recommended. Also enable the brown-out detector in fuses for reliable operation in electrically noisy environments.
Compliance Information
Compliance statuses were not stated in the verified web data; consult the official Microchip product page and environmental datasheet for ATmega324P for current RoHS/REACH declarations.