ATMEGA328P-MMH - 20MHz 32KB 8-Bit AVR MCU | Microchip Technology
Référence : ATMEGA328P-MMH ✓ ActifATMEGA328P-MMH Présentation
An 8-bit microcontroller is a compact embedded-processing IC that executes instructions from nonvolatile program memory and uses general-purpose I/O to control sensors, communications links, indicators, and actuators. Within the product hierarchy, the ATMEGA328P is an AVR microcontroller, an 8-bit RISC MCU, a semiconductor, and a member of the broader embedded-processing category. Its combination of Flash, SRAM, EEPROM, and integrated serial interfaces supports standalone control without requiring external program or data memory.
Three headline capabilities define the ATMEGA328P-MMH: a 20 MHz maximum clock, 32 KB of Flash program storage, and 2 KB of SRAM. The manufacturer lists 32 KB of ISP Flash with read-while-write capability, 1 KB of EEPROM, 23 general-purpose I/O lines, and 32 general-purpose working registers. The device also provides 131 powerful instructions with most instructions executing in a single clock cycle, supporting efficient event-driven and control-oriented firmware.
The ATMEGA architecture integrates serial communication capabilities directly into the microcontroller. The verified distributor and comparison results identify I2C, SPI, and UART/USART interfaces, allowing the device to connect with sensors, external nonvolatile memory, transceivers, and host systems. Because ATMEGA328P-MMH is a surface-mount VQFN device, its 28-pin land pattern is intended for automated assembly and compact embedded boards rather than breadboard prototyping.
Typical uses include Arduino-compatible embedded controllers, compact sensor nodes, LED and display controllers, USB-to-serial data acquisition systems, industrial control modules, and educational prototyping platforms. The ATMEGA328P family is particularly useful when moderate processing performance, deterministic I/O, and integrated serial interfaces matter more than a high-pin-count processor or external memory bus.
Designers should verify the exact oscillator, reset, and power circuitry against the manufacturer documentation before layout. Because no numerical pinout was included in the supplied verified records, this page does not invent pin names or numbering. The 28-VQFN footprint also requires careful exposed-pad, paste, stencil, and reflow design, while the 4 x 4 mm package can make assembly inspection and rework more demanding than a leaded package.
This page combines verified manufacturer specifications, distributor availability information, same-package alternatives, and practical implementation guidance. It distinguishes published ATMEGA328P-MMH facts from unresolved values and highlights the memory, package, and firmware implications engineers should verify before selecting a replacement or releasing a PCB design.
Alternatives de remplacement direct pour ATMEGA328P-MMH — 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 ATMEGA328P-MMH (même facteur de forme et même empreinte) — différant par Package, Communication Interfaces, Timers, EEPROM, Flash Memory.
ATMEGA328-MMH
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →ATMEGA168PA-MMH
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATMEGA48PA-MMHR
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →ATMEGA88A-MMH
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →ATMEGA168A-MMHR
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →ATMEGA328P-MMH Valeurs maximales et caractéristiques électriques
| Product Type | 8-bit AVR RISC microcontroller |
| Fréquence d'horloge maximale | 20 MHz |
| Flash Memory | 32 KB |
| Flash Organization | 16K x 16 bits |
| ISP Flash Read-While-Write | Supported |
| SRAM | 2 KB |
| EEPROM | 1024 bytes |
| General-Purpose I/O Lines | 23 lines |
| General-Purpose Working Registers | 32 registers |
| Instruction Set | 131 powerful AVR instructions |
| Single-Clock-Cycle Execution | Most instructions |
| Serial Interfaces | I2C, SPI, and UART/USART |
| Boîtier | 28-VQFN, 4 x 4 mm |
| Package Pin Count | 28 pins |
| Type de montage | Surface mount |
| Tension d'alimentation de fonctionnement | 4.5 V to 5.5 V |
| Terminal Finish | NiPdAu |
| Green Compliance | Green |
Guide de configuration des broches du ATMEGA328P-MMH 28 pins
Configuration des broches du ATMEGA328P-MMH (boîtier 28 pins). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour ATMEGA328P-MMH.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ATMEGA328P-MMH convient pour 6 applications: Compact Arduino-Compatible Embedded Controller, USB-to-Serial Data Acquisition, Industrial Sensor and Condition Monitoring Node, LED Lighting and Display Sequencer, Networked Communication and Gateway Controller, Educational Robotics and Embedded Prototyping.
Compact Arduino-Compatible Embedded Controller
The ATMEGA328P-MMH fits compact Arduino-compatible control boards because it combines a 20 MHz 8-bit AVR core with 32 KB of ISP Flash, 2 KB of SRAM, and 1 KB of EEPROM. Those resources support small control loops, peripheral drivers, and protocol handling without external program memory. Its I2C, SPI, and UART/USART interfaces allow sensors, displays, and serial adapters to share one controller. The 28-VQFN 4 x 4 mm package reduces board area, but the exposed-pad layout and fine-pitch assembly make stencil design and process control essential. Engineers should verify the official pin map, reset circuit, clock arrangement, and boot behavior before adapting an existing Arduino-style board.
Recommandé
USB-to-Serial Data Acquisition
ATMEGA328P-MMH is suitable for a small data-acquisition controller that gathers sensor readings and forwards them through a host interface. The device's 2 KB of SRAM provides working space for buffering, while 32 KB of Flash accommodates acquisition routines and serial protocols. SPI can support higher-throughput sensors or external memory, and UART/USART provides a straightforward path to a USB bridge such as the CP2102N-A01-GQFN20R. Because the target is a surface-mount 28-VQFN, the design must accommodate high-speed decoupling and programming access. Firmware should include startup calibration, timeout handling, and framing because the microcontroller does not itself provide a native USB interface.
Recommandé
Industrial Sensor and Condition Monitoring Node
The ATMEGA328P-MMH can serve as the local controller in an industrial sensor node that combines periodic measurements with a low-power communications link. Its 32 KB Flash and 2 KB SRAM are appropriate for moderate protocol stacks and buffering, while EEPROM preserves small configuration values. I2C accommodates temperature sensors and other low-speed peripherals, and UART/USART supports a modem or gateway. The 20 MHz rating provides useful processing margin for filtering and diagnostics. Deployment planning should account for the supplied 4.5 V to 5.5 V supply indication, transient protection, reset behavior, and grounded sensor references; a 4 x 4 mm VQFN also requires inspection under magnification after reflow.
Recommandé
LED Lighting and Display Sequencer
ATMEGA328P-MMH is well matched to LED lighting, signage, or display sequencing because its 23 general-purpose I/O lines and 20 MHz clock can drive timing, dimming, and status logic. Its 2 KB SRAM supports display buffers, while 32 KB of Flash accommodates animation tables, communication parsers, and fault logging. PWM-capable timer resources can generate repeatable dimming behavior where the verified device data confirms the relevant peripherals, and UART/USART can receive commands from a host controller. Board design should separate high-current LED drive paths from sensitive microcontroller grounding and place local supply decoupling close to the VQFN pins. Firmware must account for thermal rise and provide current limiting or constant-current drive stages.
Recommandé
Networked Communication and Gateway Controller
ATMEGA328P-MMH can act as a compact communications gateway when the design needs local protocol processing before data reaches a higher-bandwidth interface. Its I2C and SPI peripherals support sensors, transceivers, and local storage, while UART/USART bridges to wireless or wired modules. The 32 KB Flash and 2 KB SRAM suit lightweight gateways rather than complex TCP/IP stacks, so protocol footprint should be reviewed before firmware commitment. An ENC28J60/SS can provide an Ethernet path where appropriate, and the MAX232DR can support legacy RS-232 equipment. The principal layout concern is return-current control: keep serial and Ethernet return paths away from clock and sensor references, and provide robust surge protection at external connectors.
Recommandé
Educational Robotics and Embedded Prototyping
ATMEGA328P-MMH is appropriate for educational robotics and embedded-control prototypes built around the AVR ecosystem. Students can exercise timers, interrupts, GPIO, ADC-related functions, and the I2C, SPI, and UART/USART peripherals using a compact 20 MHz controller. The 32 KB Flash provides enough room for structured examples, while EEPROM can retain counters or calibration values. Companion parts such as the SN74HC595 and TCA9657 make output expansion straightforward, and the MAX232DR supports serial teaching and laboratory exercises. For classroom assembly, however, a leaded development board is often more serviceable than a 4 x 4 mm VQFN. Production derivatives still require official pin verification, programming-test access, and controlled reflow.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA328P-MMH — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA328-MMH | ATMEGA168PA-MMH | ATMEGA48PA-MMH | ATMEGA88A-MMH | ATMEGA168A-MMH |
|---|---|---|---|---|---|---|
| Package | 28-VQFN (MMH) | 28-VQFN (MMH) | 28-VQFN (MMH) | 28-VQFN (MMH) | 28-VQFN (MMH) | 28-VQFN (MMH) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC |
Principaux différenciateurs
- Largest verified memory configuration among the qualified same-package family choices (vs ATMEGA168PA-MMH)
- 20 MHz operating class with integrated serial interfaces (vs ATMEGA328-MMH)
- Compact 28-VQFN surface-mount implementation (vs ATMEGA48PA-MMH)
Notes de conception
Treat the exposed thermal pad and 28 fine-pitch leads as a controlled assembly problem. Follow the manufacturer land pattern for copper, solder-mask, paste, and stencil geometry; verify the pad's electrical connection in the official package drawing. Do not infer exposed-pad connectivity from generic VQFN examples. Keep the footprint dimensions inside the manufacturer tolerance and place programming or test pads on accessible board edges. After reflow, inspect the dense lead fields and pad under magnification because bridging or insufficient solder can make a 4 x 4 mm MCU harder to inspect and rework.
Provide local supply decoupling close to the device and route it with a short, low-impedance return path. The supplied comparison record states 4.5 V to 5.5 V for the target, but that same secondary result conflicts with the verified 20 MHz listing; confirm the official operating ranges before fixing the clock and supply design. Include a defined reset strategy, validate startup behavior across the intended supply range, and avoid routing noisy switching-current returns through the microcontroller ground reference. If the board also powers LEDs, motors, or radio modules, use separate power branches and local bulk decoupling to prevent transients from corrupting the MCU rail.
Do not substitute an ATmega328PB or a different manufacturer's 8-bit MCU without checking every signal. The supplied replacement discussion states that ATMEGA328PB may require two pins to be disconnected, and an ATmega168PA or ATMEGA48PA device can require materially less program and data memory. Verify Flash utilization, SRAM peak use, EEPROM endurance, timer channels, pin multiplexing, interrupt vectors, fuse defaults, and package drawing. Also verify ISP and bootloader behavior. A common package name alone does not prove that the target firmware will operate without modification.
Preserve signal integrity on external communication and sensor lines. Route I2C and SPI away from switching nodes and high-current LED paths, and provide common-mode return continuity beneath the board. The UART/USART connection to a USB bridge or transceiver should have a controlled ground relationship and appropriately terminated connector protection. Place input filtering close to the connector or sensor, keep oscillator routing short where an external crystal is used, and avoid long stubs on high-speed SPI lines. Validate the final layout with signal-integrity and EMC testing because the compact package can otherwise create hidden return-path discontinuities.
Informations de conformité
The verified packaging record identifies ATMEGA328P-MMH as Green with NiPdAu terminal finish and lists it as ACTIVE. RoHS, REACH, halogen-free, conflict-mineral, and automotive qualification statements were not supplied, so those fields remain unknown.
