ATMEGA323-8PC - 8-Bit AVR MCU, 32KB Flash, 8MHz | Atmel
Артикул: ATMEGA323-8PC ✗ Снят с производства| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $7.56 | $7,56 |
| 10 | $7.18 | $71,80 |
| 100 | $6.83 | $683,00 |
| 500 | $6.49 | $3.245,00 |
| 1.000 | $6.17 | $6.170,00 |
ATMEGA323-8PC Обзор
A microcontroller unit (MCU) is a single-chip computer that integrates a processor core, program memory, data memory, and peripherals on one die, sitting below application processors and above simple logic ICs in the embedded-system hierarchy. The AVR family uses an advanced RISC architecture with a Harvard memory structure, meaning program and data buses are separate and most instructions execute in a single clock cycle.
Key features include 131 powerful instructions (most single-cycle), up to 16 MIPS throughput at 16MHz-class operation, and 32 general-purpose working registers directly connected to the ALU. Peripheral set includes Brown-out Detect/Reset (BOD), Power-on Reset (POR), PWM timers, a Watchdog Timer (WDT), plus I2C (TWI), SPI, and UART/USART serial interfaces. The 32KB Flash supports In-System Programming, enabling field firmware updates without removing the chip.
Architecturally, the ATmega323 executes code from Flash at up to 1 MIPS per MHz, letting designers trade clock speed for power consumption. The JTAG-compatible pin arrangement on port C supports boundary-scan and on-chip debugging on related family members, while the large 40-PDIP package offers generous 0.1-inch pin spacing ideal for prototyping, ZIF sockets, and through-hole assembly.
Typical applications include industrial control and automation nodes, educational and hobby embedded platforms, legacy equipment maintenance where socketed MCUs simplify replacement, and instrumentation requiring 5V-tolerant I/O and the 4.5V to 5.5V industrial supply range.
Design consideration: the -8PC suffix specifies 8MHz speed grade, 0C to +70C commercial temperature rating, and 5V PDIP packaging. For 3V systems or wider temperature ranges, select the L-suffix (2.7V to 5.5V) or I-suffix (industrial temperature) variants instead.
This page synthesizes distributor pricing, drop-in alternatives from the same AVR family, pinout data, and practical design notes beyond what the manufacturer datasheet provides.
Аналоги без доработки для ATMEGA323-8PC — 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 ATMEGA323-8PC (тот же форм-фактор и посадочное место) — отличается по Package, Core Architecture, Maximum Clock Frequency, Operating Temperature, Throughput.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ATMEGA32-16PU
✅ Прямая замена✓ В наличии
$3.68 / шт.
Открыть даташит →ATMEGA32-16PI
✅ Прямая замена✓ В наличии
$2.75 / шт.
Открыть даташит →ATMEGA323L-8PC
✅ Прямая замена ⚠️ Характеристики не проверены📋 Справочный аналог (нет в каталоге)
ATMEGA163-8PC
✅ Прямая замена✓ В наличии
$3.2 / шт.
Открыть даташит →ATMEGA324P-20PU
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ATMEGA323-8PC Максимальные параметры и электрические характеристики
| Core Architecture | AVR 8-bit RISC |
| Program Memory Size | 32KB (16K x 16) Flash |
| Program Memory Type | In-System Programmable Flash |
| SRAM Size | 2KB (2K x 8) |
| EEPROM Size | 1KB |
| Максимальная тактовая частота | 8MHz |
| Supply Voltage Range | 4.5V to 5.5V |
| Instruction Count | 131 instructions |
| Peak Throughput | Up to 16 MIPS |
| Communication Interfaces | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Корпус | 40-PDIP (DIP-40) |
| Тип монтажа | Through-Hole |
| Series | AVR ATmega |
| Статус RoHS | unknown (legacy Atmel part) |
| Packaging | Tube |
Конфигурация выводов ATMEGA323-8PC
| Контакт 1 | PB0 (T0/XCK) — Port B bit 0 / Timer0 clock input / USART external clock |
| Контакт 2 | PB1 (T1) — Port B bit 1 / Timer1 clock input |
| Контакт 3 | PB2 (AIN0/INT2) — Port B bit 2 / Analog comparator positive input / External interrupt 2 |
| Контакт 4 | PB3 (AIN1) — Port B bit 3 / Analog comparator negative input |
| Контакт 5 | PB4 (SS) — Port B bit 4 / SPI slave select |
| Контакт 6 | PB5 (MOSI) — Port B bit 5 / SPI master output, slave input |
| Контакт 7 | PB6 (MISO) — Port B bit 6 / SPI master input, slave output |
| Контакт 8 | PB7 (SCK) — Port B bit 7 / SPI serial clock |
| Контакт 9 | RESET — Active-low reset input |
| Контакт 10 | VCC — Digital supply voltage (4.5V to 5.5V) |
| Контакт 11 | GND — Ground |
| Контакт 12 | XTAL2 — Crystal oscillator output |
| Контакт 13 | XTAL1 — Crystal oscillator input / external clock input |
| 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 (I2C) serial clock |
| Контакт 23 | PC1 (SDA) — Port C bit 1 / TWI (I2C) serial data |
| 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 / Timer oscillator input (32.768kHz) |
| Контакт 29 | PC7 (TOSC2) — Port C bit 7 / Timer oscillator output |
| Контакт 30 | AVCC — Analog supply voltage for ADC |
| Контакт 31 | GND — Ground |
| Контакт 32 | AREF — Analog reference voltage for ADC |
| 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
ATMEGA323-8PC подходит для 6 применениеs: Industrial Control and Automation, Embedded Education and Prototyping, Legacy Equipment Repair and Maintenance, Instrumentation and Data Acquisition, Motor Control and PWM Systems, Consumer and Security Devices.
Industrial Control and Automation
The ATMEGA323-8PC suits industrial control nodes because its 4.5V to 5.5V supply range matches legacy 5V industrial logic rails, and its Brown-out Detect and Watchdog Timer provide the fault recovery that unattended equipment demands. The 131-instruction AVR core delivers roughly 1 MIPS per MHz, so an 8MHz clock yields about 8 MIPS - ample for relay sequencing, sensor polling, and Modbus-style UART communication. The 1KB EEPROM stores configuration and calibration data through power cycles, while the 32KB Flash supports In-System Programming for field firmware updates without desoldering. The through-hole DIP-40 package also simplifies socketed replacement during line maintenance.
Рекомендуется
Embedded Education and Prototyping
The ATmega323 remains popular in teaching environments because the 40-pin PDIP package has 0.1-inch pin spacing that fits breadboards, ZIF sockets, and wire-wrap prototyping without adapters. Students can program the 32KB Flash in-system via SPI and experiment with I2C, SPI, and UART peripherals using only a crystal, a 5V supply, and a few decoupling capacitors. The 2KB SRAM is large enough for C-language projects with floating-point routines, and the 8MHz speed grade is forgiving of long breadboard traces that would break signal integrity at higher clocks. Its low cost and socketed nature make burned-out chips a trivial, teachable replacement exercise.
Рекомендуется
Legacy Equipment Repair and Maintenance
For service organizations maintaining legacy industrial and medical equipment designed in the early 2000s, the ATMEGA323-8PC is frequently the specified socketed MCU. Where the original firmware binary cannot be recompiled, replacing with the exact MPN preserves bit-exact behavior. Where recompilation is possible, the pin-compatible ATMEGA32-16PU provides a modern, actively manufactured substitute at the same DIP-40 footprint. The AVR's EEPROM retention and in-system programming allow recalibration constants to be read from a failed unit and restored into the replacement, minimizing downtime on 5V-tolerant control boards.
Рекомендуется
Instrumentation and Data Acquisition
The ATmega323 integrates an 8-channel 10-bit ADC whose reference can be driven from the AREF pin (pin 32) or the internal reference, supporting sensor measurement chains in 5V instrumentation. Its UART/USART links instruments to PCs and loggers, the TWI (I2C) bus reads EEPROMs and RTCs, and the SPI port drives high-speed ADCs and display drivers. Timer/PWM channels (OC1A, OC1B, OC2) generate control waveforms for heaters, pumps, and lamps. At 8MHz the core executes approximately 8 MIPS, sufficient to sample, filter, and stream data over UART at 115200 baud while servicing a watchdog-supervised control loop.
Рекомендуется
Motor Control and PWM Systems
The ATMEGA323's three hardware PWM outputs - OC1A and OC1B from the 16-bit Timer/Counter1 and OC2 from the 8-bit Timer/Counter2 - make it effective for DC motor and lighting control. Hardware PWM generation offloads timing from the CPU, leaving the 8 MIPS core free to run PID algorithms and communicate over UART or SPI. The input capture unit (ICP1) measures feedback frequency or pulse width from encoders and tachometers with hardware precision. With a 4.5V to 5.5V supply and 5V logic I/O, it interfaces directly to MOSFET gate drivers such as typical TC4420-class drivers without level shifting.
Рекомендуется
Consumer and Security Devices
Security panels, access-control readers, and simple consumer appliances of the ATmega323 era use its keypad-scannable 8-bit ports, UART link to modems or RS-485 transceivers, and EEPROM for storing user codes that must survive power loss. Brown-out detection prevents corrupted writes during brownout events - essential when nonvolatile credentials are being updated. The 32KB Flash accommodates larger feature sets such as LCD menu drivers and multi-protocol communication stacks, while the static design allows the clock to be throttled down for battery-backed standby modes. Socketed DIP-40 mounting allows field security updates by swapping programmed chips.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ATMEGA323-8PC — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ATMEGA32-16PU | ATMEGA32-16PI | ATMEGA323L-8PC | ATMEGA163-8PC | ATMEGA324P-20PU |
|---|---|---|---|---|---|---|
| Package | 40-PDIP | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same | 40-PDIP - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) | Microchip Technology (Atmel) |
| Max Clock Frequency | 8MHz | 16MHz | 16MHz | 8MHz | 8MHz | 20MHz |
| Flash Memory | 32KB | 32KB | 32KB | 32KB | 16KB | 32KB |
| SRAM | 2KB | 2KB | 2KB | 2KB | 1KB | 2KB |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 2.7V to 5.5V | 4.0V to 5.5V | 4.5V to 5.5V (picoPower) |
| Lifecycle Status | Obsolete | Active | Active | Obsolete | Obsolete | Active |
| RoHS Compliance | unknown (legacy) | Compliant | Compliant | unknown (legacy) | unknown (legacy) | Compliant |
Ключевые отличия
- True 5V through-hole platform with socketed DIP-40 (против ATMEGA324P-20PU)
- Wider supply window within the same family (против ATMEGA323L-8PC)
- Double the memory of its predecessor at the same clock (против ATMEGA163-8PC)
Заметки по проектированию
On DIP-40 AVR designs, connect VCC (pin 10) and AVCC (pin 30) to the 5V rail with separate 100nF ceramic decoupling capacitors placed within 10mm of each pin, and tie both GND pins (11, 31) to a solid ground net. Never leave AVCC unconnected even if the ADC is unused - the datasheet requires AVCC within 0.3V of VCC. For crystal operation, mount a crystal between XTAL1/XTAL2 with two 22pF load capacitors close to pins 12-13 to guarantee oscillator startup at 8MHz.
The -8PC suffix caps operation at 8MHz and 0C to +70C (commercial grade). Running the part above 8MHz violates the speed grade and may cause marginal instruction execution at low temperature. Also, the RESET pin (9) must not be left floating - fit a 10k pull-up to VCC so Brown-out Reset recovery is deterministic. When programming in-system, hold RESET low via the programmer; SPI programming is disabled if an external SPI device on the shared PB4-PB7 bus loads MISO excessively - use series resistors on the SPI bus.
Estimated: a typical ATmega323 at 8MHz and 5V consumes roughly 5-15mA active (per AVR family datasheet figures), so total board power including I/O loads should be budgeted below 300mW for the MCU itself; no heatsink or thermal design is required. Power the ADC from AVCC with an RC filter (10R + 10uF) from the digital rail to improve ADC noise performance. If battery backup or standby is planned, note the standard part is not optimized for low power - the ATMEGA323L or picoPower ATmega324P is the better fit.
Информация о соответствии
Legacy Atmel part predating RoHS enforcement; compliance data not published in current distributor listings. Pin-compatible active parts (ATMEGA32-16PU, ATMEGA324P-20PU) are RoHS compliant.
