ATMEGA325V-8AI - 8-bit AVR MCU, 32KB Flash, 8MHz, 1.8V | Microchip
Артикул: ATMEGA325V-8AI ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $5.2 | $5,20 |
| 10 | $4.68 | $46,80 |
| 100 | $4.16 | $416,00 |
| 500 | $3.64 | $1.820,00 |
| 1.000 | $3.2 | $3.200,00 |
ATMEGA325V-8AI Обзор
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor that executes most instructions in a single clock cycle, positioning it within the broader hierarchy of microcontrollers (MCU) and embedded processors. AVR MCUs are widely used for general-purpose embedded control where deterministic execution, low power, and simple tooling matter more than raw compute throughput.
Key features of the ATMEGA325V-8AI include 54 general-purpose I/O lines, 32 general-purpose working registers, a JTAG interface for boundary-scan, on-chip debugging, and in-system programming, three flexible Timer/Counters with compare modes, and an on-chip ADC. The V speed grade sustains full 8MHz operation down to low supply voltages, unlike the 16MHz/20MHz grades that require 4.5V or higher.
The AVR core combines a rich instruction set with single-cycle ALU operation, delivering up to 8 MIPS at 8MHz. ISP Flash with read-while-write permits firmware updates in the field without halting code execution, and the 1KB EEPROM retains calibration and configuration data through power cycles. The JTAG port supports IEEE boundary-scan test, OCD, and programming through a single connector.
Typical applications include battery-powered instruments that exploit the 1.8V operation, industrial automation controllers, and building/HVAC control nodes. The 54 GPIO lines suit panel control, relay driving, and multi-peripheral designs.
When designing, remember that the V grade is limited to 8MHz: to run faster you must switch to the P or non-V grades, which requires only a board swap to a same-footprint variant.
This page synthesizes distributor availability, same-footprint drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Аналоги без доработки для ATMEGA325V-8AI — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с ATMEGA325V-8AI (тот же форм-фактор и посадочное место) — отличается по Package, Operating Temperature, EEPROM, Supply Voltage Range, SRAM.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ATMEGA325V-8AU
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ATMEGA325PA-AUR
✅ Прямая замена✓ В наличии
$3.9 / шт.
Открыть даташит →ATMEGA3250V-8AUR
✅ Прямая замена✓ В наличии
$3.38 / шт.
Открыть даташит →ATMEGA3250PA-AUR
✅ Прямая замена✓ В наличии
$2.98 / шт.
Открыть даташит →ATMEGA325PV-10AU
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
ATMEGA325-16AU
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$2.4 / шт.
Открыть даташит →ATMEGA645V-8AU
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
ATMEGA325V-8AI Максимальные параметры и электрические характеристики
| Core Architecture | 8-bit AVR RISC |
| Program Memory (Flash) | 32KB (16K x 16), ISP with read-while-write |
| EEPROM | 1KB |
| SRAM | 2KB |
| Максимальная тактовая частота | 8MHz |
| Supply Voltage Range | 1.8V to 5.5V |
| General Purpose I/O Lines | 54 |
| Working Registers | 32 general purpose |
| Timer/Counters | 3 flexible Timer/Counters with compare modes |
| Debug/Programming Interface | JTAG (boundary-scan, on-chip debug, programming) |
| ADC | On-chip ADC (per ATmega325 family datasheet) |
| Корпус | 64-TQFP (14x14 mm, 0.8 mm pitch) |
| Тип монтажа | Surface Mount |
| Temperature Grade | Industrial (I suffix), -40C to +85C |
| Terminal Form | Gull Wing |
| Series | AVR ATmega ATmega325 |
Руководство по цоколевке ATMEGA325V-8AI в корпусе 64-tqfp (14x14 mm, 0.8 mm pitch)
Цоколевка для ATMEGA325V-8AI (корпус 64-tqfp (14x14 mm, 0.8 mm pitch)). Эта цифровая ИС включает выводы GPIO, интерфейсы связи (UART, SPI, I2C) и выводы питания. Обратитесь к техническому описанию производителя для альтернативных функций выводов и вариантов конфигурации. Необходимо для проектирования встраиваемых систем и трассировки печатных плат.
Нет подробных данных о распиновке для ATMEGA325V-8AI.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
ATMEGA325V-8AI подходит для 6 применениеs: Battery-Powered Portable Instruments, Industrial Automation and Control Nodes, Building and HVAC Control, Sensor Data Acquisition Systems, JTAG-Based Development and Test Systems, Consumer Appliance Control Boards.
Battery-Powered Portable Instruments
The ATMEGA325V-8AI is well suited to two-cell and three-cell battery instruments because it regulates and computes correctly down to 1.8V, eliminating boost-converter cost and quiescent drain. Its 8MHz V-grade core provides adequate MIPS for measurement sequencing, LCD driving, and button handling, while sleep modes cut average draw to microamp levels between readings. Typical circuits place the MCU between the battery rail and an on-chip ADC front end sampling sensor bridges, with the 1KB EEPROM storing calibration constants that survive battery replacement. Compared with 5V-only 16MHz grades, the V part trades clock speed for wide-range direct battery operation, which is usually the correct trade in portable test and metering products.
Рекомендуется
Industrial Automation and Control Nodes
In factory control panels and machine I/O nodes, the ATMEGA325V-8AI contributes 54 general-purpose I/O lines, three Timer/Counters with compare modes, and an industrial -40C to +85C temperature grade in a single 64-TQFP device. The JTAG boundary-scan capability lets production test the assembled board's interconnects per the family datasheet, while JTAG on-chip debug shortens field-firmware bring-up. A typical node uses timer compare outputs for PWM-driven actuators or relay timing, the ADC for analog setpoints, and EEPROM for node configuration. Designers should budget the 8MHz core carefully against communication stacking, but for discrete I/O and PWM control the performance headroom is generally ample.
Рекомендуется
Building and HVAC Control
Thermostats, damper controllers, and rooftop-unit boards fit the ATMEGA325V-8AI because they combine many discrete I/O points (relays, triac drives, keypad lines) with modest analog sensing, exactly matching the 54-GPIO plus ADC resource profile. The wide 1.8V to 5.5V supply range tolerates unregulated transformer-derived supplies after rectification, and the industrial temperature grade covers equipment-room extremes. Firmware typically runs a timer-interrupt state machine at low duty cycle, so the 8MHz limit is not a constraint, and EEPROM retains setpoint and schedule data through power outages. JTAG programming allows on-board firmware updates during manufacturing without removing the MCU from the panel.
Рекомендуется
Sensor Data Acquisition Systems
The on-chip ADC of the ATMEGA325V-8AI, combined with 2KB SRAM for sample buffering, makes the device a compact acquisition controller for multi-channel sensor boards. The family datasheet specifies an ADC with selectable reference and prescaling, adequate for temperature, humidity, and pressure front ends in the 8-12 bit effective range typical of these sensors. The 1KB EEPROM stores per-channel calibration coefficients, and the UART/USART resources stream results to a host. Designs requiring lower average power can migrate to the picoPower ATMEGA325PA-AUR on the same PCB footprint, since the TQFP-64 pinout is unchanged across the ATmega325 family.
Рекомендуется
JTAG-Based Development and Test Systems
Boards that must support boundary-scan production test and in-circuit firmware updates benefit directly from the ATMEGA325V-8AI's JTAG port, which the Microchip datasheet defines for boundary-scan, on-chip debugging, and JTAG programming. This suits engineering prototype systems and serviceable industrial products where field firmware upgrades through a test connector are a requirement, not an option. A typical implementation routes the JTAG port to a standard 10-pin header shared between a boundary-scan tester in production and a JTAG ICE-class debugger in development. The 32KB ISP Flash with read-while-write permits bootloader-driven self-reprogramming, complementing the JTAG path during deployment.
Рекомендуется
Consumer Appliance Control Boards
Dishwasher, cooker, and small-appliance controllers use the ATMEGA325V-8AI where a single MCU must drive display multiplexing, key scanning, relay outputs, and temperature sensing simultaneously. Three Timer/Counters with compare modes handle display refresh and buzzer tones without CPU polling, and 32 working registers keep interrupt service routines short at the 8MHz clock. The V-grade's tolerance of 1.8V-5.5V supplies eases power-supply design from transformer secondaries, while the 32KB Flash accommodates localized multi-language UI firmware. Designers should verify surge immunity of the I/O structure and add external transient protection on mains-adjacent lines, as with any appliance control MCU.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ATMEGA325V-8AI — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ATMEGA325V-8AU | ATMEGA325PA-AUR | ATMEGA3250V-8AUR | ATMEGA645V-8AU |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 32KB | 32KB | 32KB | 32KB | 64KB |
| SRAM / EEPROM | 2KB / 1KB | 2KB / 1KB | 2KB / 1KB | 2KB / 1KB | 4KB / 2KB |
| Max Clock | 8MHz | 8MHz | 20MHz (at 5V) | 8MHz | 8MHz |
| Supply Voltage Range | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V |
| GPIO Lines | 54 | 54 | 54 | 69 | 54 |
| Power Technology | Standard AVR | Standard AVR | picoPower | Standard AVR | Standard AVR |
| Temperature Suffix | I (industrial) | U (green flow) | Industrial (AUR) | Industrial (AUR) | U (green flow) |
Ключевые отличия
- Full functionality down to 1.8V at 8MHz (против ATMEGA325-16AU)
- Lower power in new designs (против ATMEGA325PA-AUR)
- More I/O when needed (против ATMEGA3250V-8AUR)
Заметки по проектированию
The V speed grade guarantees operation at up to 8MHz from 1.8V to 5.5V, but do not assume this transfers to other grades: the 16MHz ATMEGA325 requires 4.5V minimum. If your board may later be populated with a faster suffix, design the regulator and brown-out detector for the 4.5V-5.5V window. Always enable the internal brown-out reset when running from unregulated or battery supplies, and decouple each VCC pin with 100nF ceramics placed within 5mm of the pins.
The 64-TQFP uses a 0.8mm pitch and 14x14mm body; plan a 3x3 thermal via array under the center of the footprint even though dissipation is low, as it simplifies rework and improves ground return. Keep the JTAG (Port C), XTAL1/XTAL2, and RESET traces short and away from switching loads such as relay coils. Gull-wing leads tolerate hand rework well, but use a drag-solder tip and flux, and inspect with magnification for bridges between the fine-pitch pins.
Frequent migration mistake: swapping ATMEGA325V-8AI for the picoPower ATMEGA325PA-AUR without rechecking clock configuration fuses. The PA die supports higher clock speeds, but startup time and sleep-mode register behavior differ from the non-P die; re-verify your bootloader timing and watchdog settings. Also confirm suffix temperature requirements - the -8AU variant follows the green commercial flow, while this -8AI part is industrial grade. Consult Microchip's migration app notes before qualifying a second source on production boards.
Информация о соответствии
Compliance status not stated in provided web data; the AU/UR sibling suffixes use green mold compound, but verify RoHS/REACH declarations for the exact AI suffix with Microchip before procurement.
