ATMEGA323-8PI - 8-bit AVR MCU 32KB Flash 8MHz DIP-40 | Microchip
Артикул: ATMEGA323-8PI ✗ Снят с производства| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $6.9 | $6,90 |
| 10 | $6.21 | $62,10 |
| 100 | $5.52 | $552,00 |
| 500 | $4.97 | $2.485,00 |
| 1.000 | $4.48 | $4.480,00 |
ATMEGA323-8PI Обзор
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die. The AVR ATmega family sits within the 8-bit microcontroller hierarchy, widely used in embedded control, industrial automation, and legacy system maintenance. The ATmega323 belongs to the high-performance, low-power AVR product line originally developed by Atmel, now owned by Microchip Technology.
Key features include the Advanced RISC architecture with 131 powerful instructions, most executing in a single clock cycle, and fully static operation delivering up to 16 MIPS throughput at 16MHz (8 MIPS at the 8MHz grade of this part). The device provides 32KB (16K x 16) self-programmable Flash, 2KB internal SRAM, 1KB EEPROM for nonvolatile data, a JTAG interface for on-chip debugging and boundary scan, plus USART, SPI, and TWI serial interfaces and an 8-channel 10-bit ADC.
Technically, the ATmega323 was the first ATmega device to add JTAG on-chip debug, and its Harvard-architecture core fetches instructions and data over separate buses. Boot-section Flash with read-while-write support enables in-system firmware updates, while in-circuit programming via SPI allows field programming without removing the device from the PCB.
Typical applications include legacy industrial control boards, test fixtures, educational embedded platforms, motor and relay control, and repair of equipment originally designed around 40-pin ATmega devices where a socketed DIP package simplifies replacement.
Design consideration: at 8MHz this grade requires VCC of 4.5V to 5.5V; the pin-compatible ATMEGA32-16PU offers a 16MHz speed upgrade in the identical DIP-40 footprint if performance headroom is needed.
This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
Аналоги без доработки для ATMEGA323-8PI — 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 ATMEGA323-8PI (тот же форм-фактор и посадочное место) — отличается по Package, Operating Temperature, Core Architecture, ADC, Debug Interface.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ATMEGA32-16PI
✅ Прямая замена✓ В наличии
$2.75 / шт.
Открыть даташит →ATMEGA32-16PU
✅ Прямая замена✓ В наличии
$3.68 / шт.
Открыть даташит →ATMEGA323-16PI
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
ATMEGA323-8PU
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
ATMEGA32A-PU
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$3.85 / шт.
Открыть даташит →ATMEGA323-8PI Максимальные параметры и электрические характеристики
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8 MHz |
| Flash Memory Size | 32KB (16K x 16) |
| SRAM Size | 2KB |
| EEPROM Size | 1KB |
| Instructions | 131 instructions, most single-cycle |
| Max Throughput | 8 MIPS at 8 MHz (16 MIPS at 16 MHz architecture max) |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Рабочая температура | -40C to +85C (Industrial, I suffix) |
| Корпус | 40-PDIP (0.600 in, 15.24mm) |
| Тип монтажа | Through Hole |
| ADC | 8-channel, 10-bit |
| Serial Interfaces | USART, SPI, TWI (I2C-compatible) |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Debug Interface | JTAG (on-chip debug and boundary scan) |
| In-System Programming | Yes, via SPI and boot section Flash |
Конфигурация выводов ATMEGA323-8PI
| Контакт 1 | PB0 (XCK/T0) — Port B bit 0 / USART external clock / Timer0 external clock |
| Контакт 2 | PB1 (T1) — Port B bit 1 / Timer1 external clock |
| Контакт 3 | PB2 (AIN0/INT2) — Port B bit 2 / analog comparator positive input / external interrupt 2 |
| Контакт 4 | PB3 (AIN1/OC0) — Port B bit 3 / analog comparator negative input / Timer0 output compare PWM |
| Контакт 5 | PB4 (SS) — Port B bit 4 / SPI slave select |
| Контакт 6 | PB5 (MOSI) — Port B bit 5 / SPI master output slave input (also ISP data) |
| Контакт 7 | PB6 (MISO) — Port B bit 6 / SPI master input slave output (also ISP data) |
| Контакт 8 | PB7 (SCK) — Port B bit 7 / SPI serial clock (also ISP clock) |
| Контакт 9 | RESET — Active-low reset input / ISP entry |
| Контакт 10 | VCC — Digital supply voltage (4.5V to 5.5V) |
| Контакт 11 | GND — Ground |
| Контакт 12 | XTAL1 — Inverting oscillator amplifier input / internal clock input |
| Контакт 13 | XTAL2 — Inverting oscillator amplifier output |
| Контакт 14 | PD0 (RXD) — Port D bit 0 / USART receive input |
| Контакт 15 | PD1 (TXD) — Port D bit 1 / USART transmit output |
| Контакт 16 | PD2 (INT0) — Port D bit 2 / external interrupt 0 |
| Контакт 17 | PD3 (INT1) — Port D bit 3 / external interrupt 1 |
| Контакт 18 | PD4 (OC1B) — Port D bit 4 / Timer1 output compare B PWM |
| Контакт 19 | PD5 (OC1A) — Port D bit 5 / Timer1 output compare A PWM |
| Контакт 20 | PD6 (ICP1) — Port D bit 6 / Timer1 input capture |
| Контакт 21 | PD7 (OC2) — Port D bit 7 / Timer2 output compare PWM |
| Контакт 22 | PC0 (SCL) — Port C bit 0 / TWI serial clock (also JTAG TCK) |
| Контакт 23 | PC1 (SDA) — Port C bit 1 / TWI serial data (also JTAG TMS) |
| Контакт 24 | PC2 (TCK) — Port C bit 2 / JTAG test clock |
| Контакт 25 | PC3 (TMS) — Port C bit 3 / JTAG test mode select |
| Контакт 26 | PC4 (TDO) — Port C bit 4 / JTAG test data output |
| Контакт 27 | PC5 (TDI) — Port C bit 5 / JTAG test data input |
| Контакт 28 | PC6 (TOSC1) — Port C bit 6 / Timer2 oscillator input |
| Контакт 29 | PC7 (TOSC2) — Port C bit 7 / Timer2 oscillator output |
| Контакт 30 | AVCC — ADC supply voltage |
| Контакт 31 | GND — Ground (ADC ground reference) |
| Контакт 32 | AREF — ADC analog reference voltage |
| Контакт 33 | PA0 (ADC0) — Port A bit 0 / ADC channel 0 |
| Контакт 34 | PA1 (ADC1) — Port A bit 1 / ADC channel 1 |
| Контакт 35 | PA2 (ADC2) — Port A bit 2 / ADC channel 2 |
| Контакт 36 | PA3 (ADC3) — Port A bit 3 / ADC channel 3 |
| Контакт 37 | PA4 (ADC4) — Port A bit 4 / ADC channel 4 |
| Контакт 38 | PA5 (ADC5) — Port A bit 5 / ADC channel 5 |
| Контакт 39 | PA6 (ADC6) — Port A bit 6 / ADC channel 6 |
| Контакт 40 | PA7 (ADC7) — Port A bit 7 / ADC channel 7 |
Типичное применение
ATMEGA323-8PI подходит для 6 применениеs: Legacy Industrial Control Boards, Embedded Test Fixtures and Instruments, Educational and Training Platforms, Motor and Relay Control Systems, Data Loggers with EEPROM Storage, Equipment Repair and BOM Shortage Mitigation.
Legacy Industrial Control Boards
The ATMEGA323-8PI fits maintenance and repair of industrial controllers originally designed around 40-pin ATmega devices, where its -40C to +85C industrial rating and 4.5V to 5.5V supply tolerate noisy 5V factory power rails. With 32KB Flash and 2KB SRAM it runs typical PLC-adjacent firmware, relay sequencing, and Modus-over-USART communication without external memory. The socketed DIP-40 package allows field replacement without soldering, minimizing production downtime. Designers maintaining such fleets should stock the pin-compatible ATMEGA32-16PI as a 16MHz forward-compatible spare, since the ATmega323 is end-of-life and remaining distributor stock is finite.
Рекомендуется
Embedded Test Fixtures and Instruments
Bench instruments and production test fixtures benefit from the ATMEGA323-8PI's JTAG on-chip debug, which permits boundary-scan and source-level debugging of the fixture firmware itself - a capability the popular ATmega328P lacks. The 8-channel 10-bit ADC acquires pass/fail analog measurements, while SPI and TWI interfaces drive relays, DACs, and displays. At 8MHz and 4.5V to 5.5V it delivers 8 MIPS, sufficient for fixture sequencing and serial reporting over USART. The through-hole DIP-40 package tolerates repeated rework cycles common in lab environments, making it a pragmatic choice for tooling rather than high-volume products.
Рекомендуется
Educational and Training Platforms
Universities and bootcamps use the ATmega323 in embedded-systems courses because the through-hole DIP-40 package can be inserted into breadboards and sockets, letting students wire peripherals directly. The 131-instruction AVR RISC core with mostly single-cycle execution teaches real-time behavior transparently, and free avr-gcc/AVRDUDE toolchains remove licensing cost. The 32KB Flash accommodates substantial lab projects including USART terminals, SPI sensor reads on the 10-bit ADC, and TWI bus experiments. Because classroom use rarely extends beyond 0C to +70C, the commercial ATMEGA32-16PU works equally well and doubles the clock speed for timing experiments.
Рекомендуется
Motor and Relay Control Systems
The ATMEGA323-8PI drives DC motors and relay banks through its two 8-bit timers and one 16-bit timer, which generate PWM via the OC0, OC1A, and OC1B output-compare pins. Operating at 5V with industrial temperature range, it tolerates actuator-heavy enclosures, while brown-out detection and the watchdog timer keep firmware deterministic during power dips from inductive load switching. The 1KB EEPROM stores calibration constants such as PID gains across power cycles. Its three external interrupt-capable pins (INT0, INT1, INT2) accept encoder and limit-switch feedback, and the DIP-40 footprint eases gate-driver wiring in one-off industrial machinery upgrades.
Рекомендуется
Data Loggers with EEPROM Storage
The ATMEGA323-8PI's 1KB EEPROM retains logged parameters through power loss, while the 8-channel 10-bit ADC digitizes up to eight sensor inputs such as temperature, pressure, or level transmitters. USART communication exports records to a PC or GSM modem, and the TWI interface can add external I2C EEPROM or RTC chips for larger history buffers. At 8MHz the core completes sampling, scaling, and store cycles comfortably at kilohertz rates. For cold-chain or outdoor installations, the -40C to +85C industrial rating of the I-suffix part is essential; substitute the ATMEGA32-16PI for active production to secure long-term sourcing.
Рекомендуется
Equipment Repair and BOM Shortage Mitigation
Repair shops and contract manufacturers use the ATMEGA323-8PI to service discontinued equipment whose firmware was compiled for the ATmega323 register map, avoiding a costly firmware port. Because the part ships in a socket-friendly DIP-40 package, swap-in replacement takes minutes. Where stock runs dry, the pin-compatible ATMEGA32-16PI and ATMEGA32-16PU accept the same socket; firmware typically relinks against ATmega32 headers with peripheral verification. Purchasers should qualify at least two distributors (DigiKey, Ampheo, Hotenda) given EOL status, and verify date codes to mitigate counterfeit risk common with legacy microcontrollers.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ATMEGA323-8PI — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ATMEGA32-16PI | ATMEGA32-16PU | ATMEGA323-16PI | ATMEGA323-8PU | ATMEGA32A-PU |
|---|---|---|---|---|---|---|
| Package | 40-PDIP (0.600 in, 15.24mm) | 40-PDIP (0.600 in) - same | 40-PDIP (0.600 in) - same | 40-PDIP (0.600 in) - same | 40-PDIP (0.600 in) - same | 40-PDIP (0.600 in) - same |
| Brand | Microchip Technology (originally Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 8 MHz | 16 MHz | 16 MHz | 16 MHz | 8 MHz | 16 MHz |
| Flash Memory | 32KB (16K x 16) | 32KB | 32KB | 32KB | 32KB | 32KB |
| SRAM | 2KB | 2KB | 2KB | 2KB | 2KB | 2KB |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | 0C to +70C (Commercial) | -40C to +85C | 0C to +70C (Commercial) | 0C to +70C (Commercial) |
| 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 | 4.5 V to 5.5 V |
| Lifecycle Status | EOL | Active | Active | EOL | EOL | Active |
Ключевые отличия
- JTAG on-chip debug capability (против ATmega328P-family DIP parts)
- Industrial temperature grade at 8MHz DIP (против ATMEGA32-16PU)
- Lower clock grade vs same-die 16MHz variants (против ATMEGA323-16PI)
Заметки по проектированию
The ATMEGA323-8PI requires 4.5V to 5.5V at 8MHz; never operate this speed grade below 4.5V or core timing will be out of spec. Decouple VCC (pin 10) and AVCC (pin 30) with 100nF ceramic capacitors placed within 5mm of each pin, plus a 10uF bulk capacitor. AVCC should connect to VCC through a low-pass LC network when ADC accuracy matters, keeping AVCC ripple below 1 LSB of the 10-bit ADC (approximately 5mV on a 5V reference).
Fuse misconfiguration is the top failure mode when programming this device over ISP: clearing the SPIEN fuse permanently disables serial programming, and selecting an external crystal option without a crystal present bricks the board until a parallel high-voltage programmer is used. Always set fuses through AVRDUDE with verified values, and confirm the CKOPT and clock-source fuses match your 8MHz crystal circuit before locking the LB lock bits.
Because the DIP-40 package is through-hole and often socketed, minimize lead inductance effects by keeping the crystal (XTAL1/XTAL2, pins 12-13) within 15mm of the device with load capacitors grounded close by. Route the JTAG port (PC2-PC5, pins 24-27) to a 2x5 header if in-circuit debugging is planned; note that enabling JTAG consumes four Port C pins, so design the I/O map accordingly or disable JTAG via the JTD bit in software.
Информация о соответствии
The ATMEGA323 predates wide RoHS certification rollout and original Atmel production was lead-finish (non-Pb) for the PI suffix in early revisions; compliance status is not stated in the provided web data and should be confirmed with the distributor before export-controlled or EU-market production use.
