ATMEGA324PA-MU - 8-bit AVR MCU 32KB Flash 20MHz VQFN-44 | Microchip
Référence : ATMEGA324PA-MU ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.08 | $30,80 |
| 100 | $2.74 | $274,00 |
| 500 | $2.39 | $1 195,00 |
| 1 000 | $2.05 | $2 050,00 |
ATMEGA324PA-MU Présentation
An 8-bit microcontroller (MCU) is a self-contained computing device that integrates a processor core, program memory, data memory, and peripherals on a single silicon die. The AVR architecture, originally developed by Atmel and now manufactured by Microchip Technology, sits within the broader hierarchy of embedded processors: MCU -> 8-bit MCU -> AVR RISC MCU -> picoPower ATmega family. MCUs like the ATmega324PA serve as the intelligence of embedded systems, executing firmware that reads sensors, drives actuators, and communicates over serial buses.
Key features include the AVR enhanced RISC architecture with 131 powerful instructions, most executing in a single clock cycle, delivering throughput approaching 1 MIPS per MHz. The 32 KB Flash supports In-System Programming with read-while-write capability, while the picoPower technology provides aggressive sleep modes that cut quiescent consumption to microamp levels, extending battery life in portable designs.
Technically, the ATmega324PA integrates a 10-bit ADC, multiple timers/counters, USART, SPI, and TWI (I2C) serial interfaces, plus an on-chip debug interface compatible with standard AVR toolchains. The 2 KB SRAM and 1 KB EEPROM give designers headroom for buffering and parameter storage without external memory in most mid-complexity embedded applications.
Typical applications include industrial control and automation nodes, consumer appliances, battery-powered sensor and metering products, and hobbyist/embedded prototyping where the mature Arduino-compatible AVR ecosystem accelerates development.
Design consideration: choose the clock frequency deliberately - running at 20 MHz requires a 4.5 V to 5.5 V supply, while lower-voltage operation at 2.7 V or 3.3 V limits the safe maximum clock speed per the datasheet derating curves.
This page synthesizes verified distributor data, same-package drop-in alternatives, application guidance, and FAQ answers not found in the manufacturer datasheet alone, as of 2026-09-17.
Alternatives de remplacement direct pour ATMEGA324PA-MU — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA324PA-MU (même facteur de forme et même empreinte) — différant par Package, Flash Memory, EEPROM, SRAM, Speed.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA324PB-MU
✅ Remplacement direct✓ En stock
$1.35 / unité
Voir la fiche technique →ATMEGA324PA-MCHR
✅ Remplacement direct✓ En stock
$2.55 / unité
Voir la fiche technique →ATMEGA324PA-MCH
✅ Remplacement direct✓ En stock
$2.45 / unité
Voir la fiche technique →ATMEGA324PV-10MUR
✅ Remplacement direct✓ En stock
$1.52 / unité
Voir la fiche technique →ATMEGA644PA-MU
✅ Remplacement direct✓ En stock
$3.78 / unité
Voir la fiche technique →ATMEGA164PA-MU
✅ Remplacement direct✓ En stock
$2.55 / unité
Voir la fiche technique →ATMEGA324PA-MU Valeurs maximales et caractéristiques électriques
| Core Architecture | 8-bit AVR RISC |
| Flash Memory | 32 KB (16K x 16) ISP Flash |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| Fréquence d'horloge maximale | 20 MHz |
| Tension d'alimentation | 2.5 V / 3.3 V / 5 V |
| Number of I/O | 32 general purpose I/O lines |
| General Purpose Working Registers | 32 |
| Instruction Set | 131 instructions, mostly single-cycle |
| Boîtier | 44-VQFN (7 x 7 mm) with exposed pad |
| Type de montage | Surface Mount |
| Programming Method | In-System Programmable (ISP), read-while-write |
| Power Technology | picoPower low-power modes |
| Statut RoHS | Compliant |
| ECCN | EAR99 |
| Lifecycle Stage | ACTIVE |
Configuration des broches de ATMEGA324PA-MU
| Broche 1 | PA0 (ADC0) — Port A bit 0 / ADC channel 0 |
| Broche 2 | PA1 (ADC1) — Port A bit 1 / ADC channel 1 |
| Broche 3 | PA2 (ADC2) — Port A bit 2 / ADC channel 2 |
| Broche 4 | PA3 (ADC3) — Port A bit 3 / ADC channel 3 |
| Broche 5 | PA4 (ADC4) — Port A bit 4 / ADC channel 4 |
| Broche 6 | PA5 (ADC5) — Port A bit 5 / ADC channel 5 |
| Broche 7 | PA6 (ADC6) — Port A bit 6 / ADC channel 6 |
| Broche 8 | PA7 (ADC7) — Port A bit 7 / ADC channel 7 |
| Broche 9 | PB0 (XCK0/T0) — Port B bit 0 / USART external clock / Timer0 external clock |
| Broche 10 | PB1 (T1) — Port B bit 1 / Timer1 external clock |
| Broche 11 | PB2 (AIN0/INT2) — Port B bit 2 / analog comparator input 0 / external interrupt 2 |
| Broche 12 | PB3 (AIN1/OC0) — Port B bit 3 / comparator input 1 / Timer0 output compare |
| Broche 13 | PB4 (SS) — Port B bit 4 / SPI slave select |
| Broche 14 | PB5 (MOSI) — Port B bit 5 / SPI master output |
| Broche 15 | PB6 (MISO) — Port B bit 6 / SPI master input |
| Broche 16 | PB7 (SCK) — Port B bit 7 / SPI clock |
| Broche 17 | RESET — Reset input / active low |
| Broche 18 | VCC — Digital supply voltage |
| Broche 19 | GND — Ground |
| Broche 20 | XTAL2 — Crystal oscillator output |
| Broche 21 | XTAL1 — Crystal oscillator input / external clock input |
| Broche 22 | PD0 (RXD0) — Port D bit 0 / USART0 receive |
| Broche 23 | PD1 (TXD0) — Port D bit 1 / USART0 transmit |
| Broche 24 | PD2 (INT0) — Port D bit 2 / external interrupt 0 |
| Broche 25 | PD3 (INT1) — Port D bit 3 / external interrupt 1 |
| Broche 26 | PD4 (OC1B) — Port D bit 4 / Timer1 output compare B |
| Broche 27 | PD5 (OC1A) — Port D bit 5 / Timer1 output compare A |
| Broche 28 | PD6 (ICP1) — Port D bit 6 / Timer1 input capture |
| Broche 29 | PD7 (OC2A) — Port D bit 7 / Timer2 output compare A |
| Broche 30 | PC0 (SCL) — Port C bit 0 / TWI clock |
| Broche 31 | PC1 (SDA) — Port C bit 1 / TWI data |
| Broche 32 | PC2 (TCK) — Port C bit 2 / JTAG test clock |
| Broche 33 | PC3 (TMS) — Port C bit 3 / JTAG test mode select |
| Broche 34 | PC4 (TDO) — Port C bit 4 / JTAG test data output |
| Broche 35 | PC5 (TDI) — Port C bit 5 / JTAG test data input |
| Broche 36 | PC6 (TOSC1) — Port C bit 6 / Timer oscillator input |
| Broche 37 | PC7 (TOSC2) — Port C bit 7 / Timer oscillator output |
| Broche 38 | AREF — Analog reference for ADC |
| Broche 39 | GND — Ground |
| Broche 40 | AVCC — Analog supply voltage for ADC |
| Broche 41 | NC — Not connected (per datasheet) |
| Broche 42 | NC — Not connected (per datasheet) |
| Broche 43 | NC — Not connected (per datasheet) |
| Broche 44 | NC — Not connected (per datasheet) |
Applications typiques
ATMEGA324PA-MU convient pour 6 applications: Industrial Control and Automation, Battery-Powered Sensor Nodes, Consumer Appliances, Embedded Prototyping and Education, Metering and Instrumentation, Motor Control and Small Robotics.
Industrial Control and Automation
The ATMEGA324PA-MU fits industrial control nodes because it combines 32 GPIO with UART, SPI, and TWI (I2C) interfaces for driving relays, reading encoders, and linking to PLC-style peripherals over a single 8-bit AVR core at up to 20 MHz. Operating at a 5 V supply provides noise-immune logic levels compatible with legacy 24 V industrial systems through simple level shifting. The 32 KB Flash accommodates Modbus-style protocol stacks with room to spare, while the 1 KB EEPROM stores calibration and configuration data that survives power cycles without external non-volatile memory. Its picoPower sleep modes also allow duty-cycled monitoring nodes to meet modest power budgets. Place the VQFN-44 exposed pad on a solid ground plane to improve noise immunity in electrically harsh factory environments.
Recommandé
Battery-Powered Sensor Nodes
For battery-powered sensing, the ATMEGA324PA-MU's picoPower technology is the decisive parameter: power-down sleep reduces consumption to microamp levels while pin-change, watchdog, and TWI address-match interrupts wake the core on demand. The integrated 10-bit ADC reads analog sensors directly without an external converter, and the 1 KB EEPROM retains calibration constants across battery swaps. Running from a 3.3 V rail at a conservative clock frequency reduces active current in proportion to voltage and frequency, extending battery life. A typical duty-cycled design sleeps between measurement intervals, wakes via RTC interrupt, samples, transmits over UART or SPI radio, and returns to sleep. The 2 KB SRAM provides adequate buffering for sampled data blocks and communication stacks in compact wireless sensor modules.
Recommandé
Consumer Appliances
Consumer appliance control boards - from coffee machines to small HVAC units - benefit from the ATMEGA324PA-MU's balance of cost, peripherals, and mature tooling. The 32 GPIO drive seven-segment displays, keypads, and triac/relay controls directly through Port registers, while timers generate PWM for heater, fan, or motor control with hardware precision. The 20 MHz core at 5 V supplies ample computation for button debouncing, display multiplexing, and temperature control loops. The VQFN-44 package's 7 x 7 mm footprint keeps two-layer control boards compact and low cost. RoHS compliance and an ACTIVE lifecycle status simplify regulatory documentation for consumer product certification, and the mature AVR ecosystem shortens firmware development cycles compared with less-documented 8-bit alternatives.
Recommandé
Embedded Prototyping and Education
The ATMEGA324PA-MU is a natural choice for prototyping and education because the AVR architecture underpins the widely documented Arduino ecosystem, giving students and engineers access to mature libraries, bootloaders, and community resources. The 32 KB Flash supports self-programming bootloaders, so firmware can be updated over UART without a hardware programmer once the bootloader is flashed. The 44-pin package exposes four full 8-bit ports, letting learners experiment with parallel buses, shift registers, and multiple simultaneous peripherals. Debugging is supported via debugWIRE with low-cost Atmel-ICE tools. Compared with the smaller ATmega168/328, the 324PA's extra ports and 2 KB SRAM accommodate more ambitious course projects such as multi-sensor data loggers or small robot controllers without memory pressure.
Recommandé
Metering and Instrumentation
In energy meters, panel meters, and portable instrumentation, the ATMEGA324PA-MU provides the 10-bit ADC for voltage/current sampling, timers for pulse counting, and EEPROM for tamper-resistant accumulation registers. The picoPower sleep modes let handheld instruments idle between user interactions, conserving battery capacity, while the 5 V tolerant I/O simplifies interfacing with optocoupled pulse inputs from utility meters. The 2 KB SRAM handles fixed-point accumulation math and multi-line LCD buffers, and the TWI interface drives real-time clocks and external ADC front-ends when higher resolution is needed. The 20 MHz throughput of roughly 20 MIPS supports DSP-style RMS calculations at practical update rates, and the ACTIVE lifecycle status with wide distributor stock supports multi-year production programs in regulated metering markets.
Recommandé
Motor Control and Small Robotics
Small robots and motor-driven products use the ATMEGA324PA-MU's hardware PWM channels to drive H-bridges and servo interfaces with cycle-accurate timing independent of software jitter. Four 8-bit ports provide enough parallel I/O for quadrature encoders, limit switches, and status LEDs alongside the PWM outputs, eliminating port expanders in compact designs. The single-cycle instruction execution at 20 MHz yields roughly 20 MIPS, sufficient for cascaded PID loops at several kilohertz update rates. The 2 KB SRAM stores control state, trajectory buffers, and communication frames for a serial command link. Its 5 V operation matches common hobby servo and motor-driver logic thresholds directly, and the VQFN-44's exposed pad ties to ground, helping dissipate switching-related noise in shared ground designs.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA324PA-MU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA324PB-MU | ATMEGA324PA-MCHR | ATMEGA324PV-10MUR | ATMEGA644PA-MU | ATMEGA164PA-MU |
|---|---|---|---|---|---|---|
| Package | VQFN-44 (7 x 7 mm) | VQFN-44 (7 x 7 mm) - same | VQFN-44 (7 x 7 mm) - same | VQFN-44 (7 x 7 mm) - same | VQFN-44 (7 x 7 mm) - same | VQFN-44 (7 x 7 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 | 64 KB | 16 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB | 1 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 4 KB | 512 B |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 10 MHz | 20 MHz | 20 MHz |
| Serial Interfaces | USART, SPI, TWI | 2x USART, 2x SPI, 2x TWI (superset) | USART, SPI, TWI | USART, SPI, TWI | USART, SPI, TWI | USART, SPI, TWI |
| Lifecycle Status | ACTIVE | ACTIVE (newest revision) | ACTIVE | ACTIVE | ACTIVE | ACTIVE |
Principaux différenciateurs
- Full 20 MHz throughput at lowest family cost (vs ATMEGA324PV-10MUR)
- Peripheral superset drop-in upgrade available (vs ATMEGA324PB-MU)
- Twice the memory of the downscreen family member (vs ATMEGA164PA-MU)
- Compact MLF footprint with exposed thermal pad (vs ATMEGA324PA-AUR)
Notes de conception
Match the clock frequency to the supply voltage. At 5 V the ATmega324PA core can run to its full 20 MHz rating; at 3.3 V and lower voltages, the safe maximum frequency derates per the AVR datasheet frequency-versus-VCC curve. Running 20 MHz from a 3.3 V rail risks unstable execution. Use a 100 nF ceramic decoupling capacitor at each VCC pin plus bulk 10 uF, and connect AVCC to VCC through an RC filter (10 ohm / 100 nF) when ADC accuracy matters. Never leave AVCC unconnected even if the ADC is unused.
The VQFN-44 exposed die pad is the primary ground connection and thermal path - solder it to a grounded pad with an array of thermal vias (typically 3x3 to 4x4 via grid). Insufficient exposure-pad soldering is the most common field failure with MLF-package AVRs, causing intermittent resets under load. For hand assembly, consider the TQFP-44 variant ATMEGA324PA-AUR, which drops into a different but easier-to-inspect footprint. Keep the crystal within 10 mm of XTAL1/XTAL2 with short ground returns for clean 20 MHz operation.
When using SPI above 8 MHz or long UART runs, route PB5-PB7 (MOSI/MISO/SCK) as a matched group with ground guard traces, and keep TWI (PC0/PC1) lines under 30 cm with 4.7 kohm pull-ups to VCC. Verify RESET is pulled up (10 kohm) and optionally gated by an external supervisor if brownout at 2.7-3.3 V is expected - although the internal BOD can be enabled by fuse, the external RC reset adds robustness in electrically noisy industrial cabinets.
If migrating from the ATMEGA324PA to the pin-compatible ATMEGA324PB, do not assume register-level identity: the PB adds second USART/SPI/TWI instances and moves some pin-map assignments, so peripheral initialization code must be recompiled and re-verified. Also confirm EEPROM wear limits (100k cycles typical) if your firmware writes calibration data frequently. Distributor databases cite an estimated family EOL of 2026 - for designs beyond that horizon, validate the 324PB as your long-term source.
Informations de conformité
RoHS compliant and lead-free per DigiKey and datasheets.com listings. Halogen-free status explicitly confirmed only for the ATMEGA324PA-MCHR build variant per GlobalSpec cross-reference data. AEC-Q100 qualification not stated in provided data for this consumer/industrial grade part.
