ATMEGA128L-8AI - 8-bit AVR MCU 8MHz 128KB TQFP-64 | Microchip
Артикул: ATMEGA128L-8AI ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $9.85 | $9,85 |
| 10 | $8.95 | $89,50 |
| 100 | $7.98 | $798,00 |
| 500 | $7.25 | $3.625,00 |
| 1.000 | $6.6 | $6.600,00 |
ATMEGA128L-8AI Обзор
An 8-bit microcontroller (MCU) is a self-contained computing chip integrating a processor core, program memory, data memory, and peripherals such as timers, UARTs, SPI, I2C, and ADC on a single die. MCUs sit at the device level of the embedded systems hierarchy: semiconductor -> integrated circuit -> embedded processor -> microcontroller, and are the workhorses of industrial control, instrumentation, and consumer electronics.
Key features of the ATmega128 include the advanced AVR RISC architecture with 133 mostly single-cycle instructions, 32 general-purpose working registers, throughput approaching 1 MIPS per MHz, and a JTAG interface for on-chip debugging and boundary-scan. The chip also integrates two 8-bit timers, two 16-bit timers, two USARTs, SPI, TWI (I2C), and an analog comparator, giving designers a complete peripheral set without external glue logic.
Architecturally, the ATmega128 uses a Harvard structure with separate program and data buses, allowing instruction fetch and data access to occur in the same clock cycle. Self-programming Flash enables in-system field updates through boot-loader firmware, while the byte-addressable EEPROM retains calibration data through power cycles. Power management modes (idle, power-down, power-save) reduce consumption for battery-operated designs.
Typical applications include industrial automation controllers, building and HVAC control, metering, battery-powered instrumentation, and legacy embedded designs requiring large 128KB program memory at modest clock rates.
Design consideration: choose the -8AI (8MHz, industrial) over the -16AI variant when operating below 5.5V or when power budget matters; verify that the ATmega128L flash erase/write cycles at low voltage match your end-of-life update plans.
This page synthesizes distributor availability data, same-package drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Аналоги без доработки для ATMEGA128L-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 ATMEGA128L-8AI (тот же форм-фактор и посадочное место) — отличается по Timers/Counters, Package, Operating Temperature, Flash Memory, SRAM.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ATMEGA128-16AI
✅ Прямая замена✓ В наличии
$5.9 / шт.
Открыть даташит →ATMEGA128-16AN
✅ Прямая замена✓ В наличии
$7.44 / шт.
Открыть даташит →ATMEGA128L-8AU
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$23.49 / шт.
Открыть даташит →ATMEGA1284-AUR
✅ Прямая замена✓ В наличии
$4.61 / шт.
Открыть даташит →ATMEGA1284P-MUR
✅ Прямая замена✓ В наличии
Уточнить цену
Открыть даташит →ATMEGA1281V-8AUR
✅ Прямая замена✓ В наличии
$4.4 / шт.
Открыть даташит →ATMEGA128L-8AI Максимальные параметры и электрические характеристики
| Core | AVR 8-bit RISC |
| Program Memory Size | 128KB (64K x 16) Flash |
| Program Memory Type | In-System Programmable FLASH |
| RAM Size | 4K x 8 SRAM |
| EEPROM Size | 4KB |
| Maximum Clock Speed | 8MHz |
| Supply Voltage Range | 2.7V to 5.5V |
| MIPS Throughput | Up to 8 MIPS at 8MHz (approx. 1 MIPS/MHz) |
| ADC | 8-channel 10-bit |
| Timers | Two 8-bit, two 16-bit |
| Communication Interfaces | 2x USART, SPI, TWI (I2C) |
| Debug Interface | JTAG (on-chip debug and boundary scan) |
| Рабочая температура | -40C to +85C (industrial, A grade) |
| Корпус | 64-TQFP (14x14 mm) |
| Тип монтажа | Surface Mount |
| Number of I/O | 53 programmable I/O lines |
Конфигурация выводов ATMEGA128L-8AI
| Контакт 1 | PEN — Programming enable for serial programming |
| Контакт 2 | PE0 (RXD0/PDI) — USART0 receive / SPI programming data in |
| Контакт 3 | PE1 (TXD0/PDO) — USART0 transmit / SPI programming data out |
| Контакт 4 | PE2 (XCK0/AIN0) — USART0 clock / analog comparator 0 input |
| Контакт 5 | PE3 (AIN1/OC3A) — Analog comparator 1 input / Timer3 output compare A |
| Контакт 6 | PE4 (OC3B/INT4) — Timer3 output compare B / external interrupt 4 |
| Контакт 7 | PE5 (OC3C/INT5) — Timer3 output compare C / external interrupt 5 |
| Контакт 8 | PE6 (T3/INT6) — Timer3 clock input / external interrupt 6 |
| Контакт 9 | PE7 (ICP3/INT7) — Timer3 input capture / external interrupt 7 |
| Контакт 10 | VCC — Digital supply voltage |
| Контакт 11 | GND — Ground |
| Контакт 12 | PG0 (WR) — External memory write strobe / GPIO |
| Контакт 13 | PG1 (RD) — External memory read strobe / GPIO |
| Контакт 14 | PC0 (A8) — External memory address bit 8 / GPIO |
| Контакт 15 | PC1 (A9) — External memory address bit 9 / GPIO |
| Контакт 16 | PC2 (A10) — External memory address bit 10 / GPIO |
| Контакт 17 | PC3 (A11) — External memory address bit 11 / GPIO |
| Контакт 18 | PC4 (A12) — External memory address bit 12 / GPIO |
| Контакт 19 | PC5 (A13) — External memory address bit 13 / GPIO |
| Контакт 20 | PC6 (A14) — External memory address bit 14 / GPIO |
| Контакт 21 | PC7 (A15) — External memory address bit 15 / GPIO |
| Контакт 22 | AREF — ADC reference voltage |
| Контакт 23 | AGND — Analog ground |
| Контакт 24 | AVCC — ADC and Port F supply voltage |
| Контакт 25 | PF0 (ADC0) — ADC input 0 / GPIO |
| Контакт 26 | PF1 (ADC1) — ADC input 1 / GPIO |
| Контакт 27 | PF2 (ADC2) — ADC input 2 / GPIO |
| Контакт 28 | PF3 (ADC3) — ADC input 3 / GPIO |
| Контакт 29 | PF4 (ADC4/TCK) — ADC input 4 / JTAG test clock |
| Контакт 30 | PF5 (ADC5/TMS) — ADC input 5 / JTAG test mode select |
| Контакт 31 | PF6 (ADC6/TDO) — ADC input 6 / JTAG test data out |
| Контакт 32 | PF7 (ADC7/TDI) — ADC input 7 / JTAG test data in |
| Контакт 33 | GND — Ground |
| Контакт 34 | VCC — Digital supply voltage |
| Контакт 35 | PA0 (AD0) — External memory address/data bit 0 / GPIO |
| Контакт 36 | PA1 (AD1) — External memory address/data bit 1 / GPIO |
| Контакт 37 | PA2 (AD2) — External memory address/data bit 2 / GPIO |
| Контакт 38 | PA3 (AD3) — External memory address/data bit 3 / GPIO |
| Контакт 39 | PA4 (AD4) — External memory address/data bit 4 / GPIO |
| Контакт 40 | PA5 (AD5) — External memory address/data bit 5 / GPIO |
| Контакт 41 | PA6 (AD6) — External memory address/data bit 6 / GPIO |
| Контакт 42 | PA7 (AD7) — External memory address/data bit 7 / GPIO |
| Контакт 43 | PB0 (SS) — SPI slave select / GPIO |
| Контакт 44 | PB1 (SCK) — SPI serial clock / GPIO |
| Контакт 45 | PB2 (MOSI) — SPI master output / GPIO |
| Контакт 46 | PB3 (MISO) — SPI master input / GPIO |
| Контакт 47 | PB4 (OC0) — Timer0 output compare / GPIO |
| Контакт 48 | PB5 (OC1A) — Timer1 output compare A / GPIO |
| Контакт 49 | PB6 (OC1B) — Timer1 output compare B / GPIO |
| Контакт 50 | PB7 (OC2/OC1C) — Timer2 output compare / Timer1 output compare C / GPIO |
| Контакт 51 | RESET — Reset input (active low) |
| Контакт 52 | VCC — Digital supply voltage |
| Контакт 53 | GND — Ground |
| Контакт 54 | XTAL2 — Crystal oscillator output |
| Контакт 55 | XTAL1 — Crystal oscillator input / external clock |
| Контакт 56 | PD0 (SCL/INT0) — TWI clock / external interrupt 0 |
| Контакт 57 | PD1 (SDA/INT1) — TWI data / external interrupt 1 |
| Контакт 58 | PD2 (TXD1/INT2) — USART1 transmit / external interrupt 2 |
| Контакт 59 | PD3 (RXD1/INT3) — USART1 receive / external interrupt 3 |
| Контакт 60 | PD4 (ICP1) — Timer1 input capture / GPIO |
| Контакт 61 | PD5 (XCK1) — USART1 external clock / GPIO |
| Контакт 62 | PD6 (T1) — Timer1 external clock input / GPIO |
| Контакт 63 | PD7 (T2) — Timer2 external clock input / GPIO |
| Контакт 64 | PG2 (ALE) — External memory address latch enable / GPIO |
Типичное применение
ATMEGA128L-8AI подходит для 6 применениеs: Industrial Automation Controllers, Battery-Powered Metering and Instrumentation, Building and HVAC Control, Legacy Embedded Design Maintenance, IoT Sensor Nodes and Gateways, Test Equipment and Educational Systems.
Industrial Automation Controllers
The ATMEGA128L-8AI fits industrial automation nodes because its 128KB Flash accommodates large state machines and protocol stacks, while 4KB SRAM buffers sensor data and communication frames. Two USARTs and TWI (I2C) let a single chip bridge field devices to a Modbus or custom serial backbone, and the 53 I/O lines directly drive relays, optocouplers, and status LEDs. The -40C to +85C industrial grade ensures reliable cabinet operation, and the external memory interface (ports A and C) can extend RAM for data logging. Because throughput reaches roughly 1 MIPS per MHz at 8MHz, control loops in the millisecond range are comfortably handled without a faster, power-hungry processor.
Рекомендуется
Battery-Powered Metering and Instrumentation
In battery-powered meters, the ATmega128L low-voltage grade (2.7V to 5.5V) runs directly from a 3V lithium cell, eliminating boost-converter cost and quiescent drain. The 8-channel 10-bit ADC digitizes multiple sensor channels, and the byte-addressable 4KB EEPROM stores calibration constants across battery replacement. Sleep modes cut consumption between measurements, and the ~1 MIPS/MHz efficiency allows the clock to be scaled down for compute-light tasks. With 128KB of self-programming Flash, firmware field updates over the meter's serial link are possible via boot-loader code, extending deployed product lifetime. The industrial temperature rating also suits outdoor meter enclosures exposed to seasonal extremes.
Рекомендуется
Building and HVAC Control
HVAC controllers benefit from the ATMEGA128L-8AI's balance of memory and peripherals: TWI and SPI manage temperature, humidity, and pressure sensor networks, timers generate PWM for fan and valve actuation, and the ADC reads thermistor bridges directly. The 128KB program space holds PID libraries, scheduling logic, and communications (Modbus RTU over USART) simultaneously. The 64-TQFP's 53 I/O lines interface keypads, displays, and actuator relays without port expanders. Its 8MHz operation is ample for second-level HVAC loop timing, while low-voltage tolerance allows a shared 3.3V logic rail. The JTAG interface simplifies production debugging of control firmware in the panel during commissioning.
Рекомендуется
Legacy Embedded Design Maintenance
Many long-life products were designed around the ATmega128 and still require maintenance builds. The ATMEGA128L-8AI remains the exact drop-in for these PCBs: same TQFP-64 footprint, same fuse set, same instruction set, so existing firmware binaries reflash without modification. The -8AI suffix preserves the industrial temperature range that the original commercial -8AU did not, improving robustness at zero PCB cost. This makes it ideal for spare-part refresh programs in factory equipment, elevators, and lab instruments where a redesign to a modern MCU would trigger full requalification. Availability from 16 distributors, per Octopart, keeps maintenance lines running without long lead times.
Рекомендуется
IoT Sensor Nodes and Gateways
For wired IoT nodes, the ATMEGA128L-8AI provides enough Flash to embed a TCP/serial gateway stack alongside application logic, with 4KB SRAM handling packet buffers. SPI and USART interfaces connect radio modules, Ethernet controllers, or RS-485 transceivers, and the ADC digitizes local analog sensors. Operating at 8MHz keeps consumption low for node designs powered by wall adapters or energy harvesting. The self-programming Flash enables over-the-serial firmware updates in the field, a prerequisite for maintainable IoT fleets. Although newer 32-bit MCUs exist, the ATmega128's deterministic single-cycle core, industrial grade, and long availability record make it a dependable choice for simple, robust nodes.
Рекомендуется
Test Equipment and Educational Systems
Bench instruments and university lab platforms frequently use the ATmega128 because the JTAG interface supports full on-chip debugging with Atmel-ICE tools, and the ATmega128 instruction set is a common AVR teaching target. The 10-bit ADC and timers implement data acquisition, PWM signal generation, and frequency measurement directly; the external memory bus supports experiment expansion boards. The 128KB Flash holds monitor firmware plus application code simultaneously, letting students download programs without swapping boot-loaders. Because the -8AI grade tolerates 2.7V to 5.5V, trainers can demonstrate both 3.3V and 5V logic interfacing on one board, a practical benefit in mixed-voltage lab coursework.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ATMEGA128L-8AI — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ATMEGA128-16AI | ATMEGA128-16AN | ATMEGA1284-AUR | ATMEGA1284P-MUR | ATMEGA1281V-8AUR |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (14x14 mm) | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same |
| Brand | Microchip Technology (Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128KB | 128KB | 128KB | 128KB | 128KB | 128KB |
| SRAM | 4KB | 4KB | 4KB | 16KB | 16KB | 8KB |
| Max Clock Speed | 8MHz | 16MHz | 16MHz | 20MHz | 20MHz | 8MHz |
| Supply Voltage | 2.7V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Pin Compatibility | Reference (ATmega128 TQFP-64 pinout) | Pin-to-pin identical | Pin-to-pin identical | Largely pin-compatible, peripheral map differs | Largely pin-compatible, peripheral map differs | Similar TQFP-64, verify peripheral map |
Ключевые отличия
- Widest supply range in the same ATmega128 pinout (против ATMEGA128-16AI)
- External memory interface with full address bus (против ATMEGA1281V-8AUR)
- Industrial temperature at low-voltage grade (против ATMEGA128L-8AU)
Заметки по проектированию
Decouple all three VCC pins (10, 34, 52) and AVCC (pin 24) with 100nF ceramic capacitors placed within 5mm of each pin, plus one bulk 4.7uF to 10uF capacitor per supply rail. AVCC must be connected to VCC even if the ADC is unused, and never exceed the AVCC-VCC delta of 0.3V per the datasheet absolute maximum ratings. If the ADC is used, connect AREF (pin 22) via an RC network (e.g. 10k ohm series resistor and 100nF capacitor) rather than driving it directly from a regulator output.
Route the crystal between XTAL1 (pin 55) and XTAL2 (pin 54) with the shortest possible traces and place load capacitors (typically 12pF to 22pF, per crystal specification) directly at the pins, with a local ground guard ring. Keep the JTAG chain (PF4-PF7) traces short and add header access for production programming. Analog ADC routing on Port F should be separated from fast digital switching on Port A when the external memory bus is active, since bus toggling couples noise into ADC readings.
Three fuse-related issues are the most common ATmega128 field failures: (1) accidentally disabling the JTAGEN fuse locks out on-chip debug while PF4-PF7 revert to ADC pins; (2) enabling the CKOPT fuse is required for crystal operation above 8MHz or in noisy environments; (3) wrong SUT/CKSEL bits can brick boards requiring HV parallel programming via the PEN pin. Also note the ATmega128 supports both 16-bit and 8-bit program counter modes on the external memory interface - misconfiguration of XMCRA causes address bus malfunctions on port C.
Информация о соответствии
Current Microchip ATmega128 family production parts are offered in RoHS-compliant, lead-free packages; REACH and halogen-free status must be confirmed per lot certificate.