ATMEGA128L-8MU - 8MHz AVR MCU 128KB Flash QFN-64 | Microchip
Артикул: ATMEGA128L-8MU ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $19.12 | $19,12 |
| 10 | $17.21 | $172,10 |
| 100 | $15.3 | $1.530,00 |
| 500 | $13.77 | $6.885,00 |
| 1.000 | $12.39 | $12.390,00 |
ATMEGA128L-8MU Обзор
An 8-bit AVR microcontroller is a Harvard-architecture RISC processor in which most of its 133 powerful instructions execute in a single clock cycle, placing it in the broader hierarchy of microcontroller units (MCUs) within the embedded processor and semiconductor family. MCUs integrate CPU, program memory, data memory, and peripherals on a single die, making them the control backbone of embedded systems.
Key features of the ATMEGA128L-8MU include 128KB (64K x 16) programmable Flash memory, 4KB SRAM, 4KB EEPROM, an 8-channel 10-bit A/D converter, and an IEEE-compatible JTAG interface for on-chip debugging and boundary-scan. It also provides two 8-bit and two 16-bit timers/counters, two USARTs, SPI, TWI (I2C-compatible), and six PWM channels, enabling compact single-chip designs.
Technically, the advanced AVR RISC architecture with a 32-register general-purpose file is directly connected to the ALU, allowing one instruction executed per clock cycle for throughput up to 8 MIPS at 8 MHz. The JTAG boundary-scan capability simplifies production test, while In-System Programmability allows firmware updates on the final PCB without removal.
Typical applications include industrial control and automation nodes, building and HVAC controllers, sensor data acquisition systems, and legacy embedded designs originally built around the pin-compatible ATmega103. The low-voltage 2.7V operation suits battery-powered instruments.
A key design consideration: when replacing an ATmega103, configure the M103C fuse so the ATmega128 boots with ATmega103-compatible behavior; consult Microchip application note on ATmega103 migration.
This page synthesizes distributor pricing, verified drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
Аналоги без доработки для ATMEGA128L-8MU — 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-8MU (тот же форм-фактор и посадочное место) — отличается по Package, Timers/Counters, SRAM, Instructions, Debug Interface.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
ATMEGA1281V-8MU
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$5.92 / шт.
Открыть даташит →ATMEGA1281V-8MUR
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$4.02 / шт.
Открыть даташит →ATMEGA1281-16MUR
✅ Прямая замена ⚠️ Характеристики не проверены✓ В наличии
$8.78 / шт.
Открыть даташит →ATMEGA128L-8MU Максимальные параметры и электрические характеристики
| Core Architecture | 8-bit AVR RISC |
| Max Clock Speed | 8 MHz |
| Program Memory (Flash) | 128KB (64K x 16) |
| SRAM | 4KB |
| EEPROM | 4KB |
| Напряжение питания | 2.7 V to 5.5 V |
| I/O Pins | 53 |
| ADC | 8-channel, 10-bit |
| Debug Interface | JTAG (on-chip debugging, boundary scan) |
| Instructions | 133 (most single-cycle) |
| Корпус | 64-QFN / MLF (9 x 9 mm) |
| Тип монтажа | Surface Mount |
| Рабочая температура | Industrial (-40C to +85C) |
| Series | AVR ATmega |
| Статус RoHS | Compliant (GREEN per FindIC listing) |
| Lifecycle Stage | Active |
Конфигурация выводов ATMEGA128L-8MU
| Контакт 1 | PEN — Programming Enable (serial program and debug) |
| Контакт 2 | PE0 (RXD0/PDI) — USART0 receive / programming data in |
| Контакт 3 | PE1 (TXD0/PDO) — USART0 transmit / programming data out |
| Контакт 4 | PE2 (XCK0/AIN0) — USART0 clock / analog comparator input 0 |
| Контакт 5 | PE3 (OC3A/AIN1) — Timer3 output compare A / comparator input 1 |
| 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 | PB0 (SS) — SPI slave select / general I/O |
| Контакт 11 | PB1 (SCK) — SPI clock / general I/O |
| Контакт 12 | PB2 (MOSI) — SPI master data out / general I/O |
| Контакт 13 | PB3 (MISO) — SPI master data in / general I/O |
| Контакт 14 | PB4 (OC0) — Timer0 output compare / PWM |
| Контакт 15 | PB5 (OC1A) — Timer1 output compare A / PWM |
| Контакт 16 | PB6 (OC1B) — Timer1 output compare B / PWM |
| Контакт 17 | PB7 (OC2/OC1C) — Timer2 output compare / Timer1 output compare C |
| Контакт 18 | PG3 (TOSC2) — Timer oscillator output (32 kHz RTC crystal) |
| Контакт 19 | PG4 (TOSC1) — Timer oscillator input (32 kHz RTC crystal) |
| Контакт 20 | RESET — Reset input (active low) |
| Контакт 21 | VCC — Digital supply voltage |
| Контакт 22 | GND — Digital ground |
| Контакт 23 | XTAL2 — System crystal oscillator output |
| Контакт 24 | XTAL1 — System crystal oscillator input |
| Контакт 25 | PD0 (SCL/INT0) — TWI clock / external interrupt 0 |
| Контакт 26 | PD1 (SDA/INT1) — TWI data / external interrupt 1 |
| Контакт 27 | PD2 (RXD1/INT2) — USART1 receive / external interrupt 2 |
| Контакт 28 | PD3 (TXD1/INT3) — USART1 transmit / external interrupt 3 |
| Контакт 29 | PD4 (ICP1) — Timer1 input capture |
| Контакт 30 | PD5 (XCK1) — USART1 external clock |
| Контакт 31 | PD6 (T1) — Timer1 external counter input |
| Контакт 32 | PD7 (T2) — Timer2 external counter input |
| Контакт 33 | PG0 (WR) — External memory write strobe |
| Контакт 34 | PG1 (RD) — External memory read strobe |
| Контакт 35 | PC0 (A8) — External memory address line 8 / general I/O |
| Контакт 36 | PC1 (A9) — External memory address line 9 / general I/O |
| Контакт 37 | PC2 (A10) — External memory address line 10 / general I/O |
| Контакт 38 | PC3 (A11) — External memory address line 11 / general I/O |
| Контакт 39 | PC4 (A12) — External memory address line 12 / general I/O |
| Контакт 40 | PC5 (A13) — External memory address line 13 / general I/O |
| Контакт 41 | PC6 (A14) — External memory address line 14 / general I/O |
| Контакт 42 | PC7 (A15) — External memory address line 15 / general I/O |
| Контакт 43 | PG2 (ALE) — External memory address latch enable |
| Контакт 44 | PA7 (AD7) — External memory address/data line 7 / general I/O |
| Контакт 45 | PA6 (AD6) — External memory address/data line 6 / general I/O |
| Контакт 46 | PA5 (AD5) — External memory address/data line 5 / general I/O |
| Контакт 47 | PA4 (AD4) — External memory address/data line 4 / general I/O |
| Контакт 48 | PA3 (AD3) — External memory address/data line 3 / general I/O |
| Контакт 49 | PA2 (AD2) — External memory address/data line 2 / general I/O |
| Контакт 50 | PA1 (AD1) — External memory address/data line 1 / general I/O |
| Контакт 51 | PA0 (AD0) — External memory address/data line 0 / general I/O |
| Контакт 52 | VCC — Digital supply voltage |
| Контакт 53 | GND — Digital ground |
| Контакт 54 | PF0 (ADC0) — ADC input 0 / general I/O |
| Контакт 55 | PF1 (ADC1) — ADC input 1 / general I/O |
| Контакт 56 | PF2 (ADC2) — ADC input 2 / general I/O |
| Контакт 57 | PF3 (ADC3) — ADC input 3 / general I/O |
| Контакт 58 | PF4 (ADC4/TCK) — ADC input 4 / JTAG test clock |
| Контакт 59 | PF5 (ADC5/TMS) — ADC input 5 / JTAG test mode select |
| Контакт 60 | PF6 (ADC6/TDO) — ADC input 6 / JTAG test data out |
| Контакт 61 | PF7 (ADC7/TDI) — ADC input 7 / JTAG test data in |
| Контакт 62 | AREF — ADC analog reference voltage |
| Контакт 63 | AGND — Analog ground |
| Контакт 64 | AVCC — ADC supply voltage |
Типичное применение
ATMEGA128L-8MU подходит для 6 применениеs: Industrial Control and Automation, Battery-Powered Instrumentation, Building Automation and HVAC Controllers, Legacy ATmega103 System Migration, Sensor Data Acquisition Systems, Embedded Robotics and Motor Control.
Industrial Control and Automation
The ATMEGA128L-8MU fits industrial control nodes because it combines 53 I/O lines, dual USARTs for Modbus RTU linking, SPI/TWI for field sensors, and a 10-bit ADC with 8 multiplexed channels for analog process signals. Operating from a 2.7V to 5.5V supply lets it run directly from a 5V industrial rail, and the industrial temperature grade of -40C to +85C withstands cabinet environments. The JTAG boundary-scan interface accelerates production test of assembled control boards. Placed as the main controller, its 8 MHz core delivers roughly 8 MIPS, sufficient for relay sequencing, PID loops at moderate rates, and protocol handling, while the 4KB EEPROM stores calibration and configuration data that must survive power cycles.
Рекомендуется
Battery-Powered Instrumentation
With its 'L' low-voltage grade rated 2.7V to 5.5V, the ATMEGA128L-8MU runs directly from a 3.0V lithium cell without a boost regulator, and AVR sleep modes (idle, power-down, power-save) cut current to microamp levels between measurements. The 8-channel 10-bit ADC digitizes sensor inputs, and the 4KB EEPROM retains zero/span calibration without battery backup. The 64-QFN 9x9 mm package suits compact handheld enclosures, and 53 I/O lines drive displays, keypads, and actuators. A typical design wakes the MCU on an external interrupt, samples the ADC array, logs to EEPROM or external flash over SPI, and returns to power-down, maximizing battery life in data loggers and portable meters.
Рекомендуется
Building Automation and HVAC Controllers
The ATMEGA128L-8MU is a proven fit for building automation panels: dual USARTs handle BACnet/Modbus links, TWI (I2C) reads temperature and humidity sensors, and six PWM channels drive damper motors and heater triacs. The 8 MHz AVR core comfortably runs a multi-loop PID scheduler with 8 MIPS single-cycle throughput, while 128KB Flash accommodates protocol stacks and web- bootloader firmware for field updates over the network. The industrial temperature rating supports rooftop and mechanical-room installations, and the JTAG interface enables boundary-scan test of assembled controller boards. The 4KB EEPROM stores setpoints and schedules that persist through power interruptions without external memory.
Рекомендуется
Legacy ATmega103 System Migration
Microchip positions the ATmega128 as the direct migration device for the discontinued ATmega103: it is 100% pin compatible and can replace the ATmega103 on existing PCBs. Engineers program the M103C compatibility fuse so the ATMEGA128L-8MU boots with ATmega103 behavior, then follow the Microchip application note 'Replacing ATmega103 by ATmega128' for register and SRAM-mapping caveats. The low-voltage L grade matches the 3.3V supplies common on ATmega103 boards, and the 64-QFN/MLF package mirrors the original footprint. This path extends product lifetimes with zero PCB redesign while gaining 128KB Flash and JTAG debug that the ATmega103 lacked.
Рекомендуется
Sensor Data Acquisition Systems
For distributed data acquisition, the ATMEGA128L-8MU offers an 8-channel 10-bit ADC with internal reference and oversampling capability, letting one MCU digitize eight analog sensors at up to roughly 15 kSPS effective rate. SPI connects high-speed external ADCs or precision converters when 10-bit resolution is insufficient, while TWI supports low-rate digital sensors on a shared bus. Dual USARTs stream measurements to both a local HMI and a remote radio or gateway simultaneously. Its 2.7V to 5.5V supply and industrial temperature range suit unattended field installations, and power-down sleep between sampling windows keeps average drain compatible with battery or energy-harvesting power budgets in remote monitoring networks.
Рекомендуется
Embedded Robotics and Motor Control
Robotics controllers benefit from the ATMEGA128L-8MU's six PWM channels, four timers, and rich I/O: PWM outputs drive H-bridge gates for DC motor speed control, quadrature encoders feed external-interrupt and timer-capture inputs, and SPI manages an IMU at kilohertz rates. The 8 MHz single-cycle AVR core executes a 1 kHz control loop with headroom for PID per axis, while 128KB Flash holds trajectory tables and communication stacks (Bluetooth or serial telemetry on either USART). Operating from a 5V rail shared with servos simplifies power design, and 53 GPIO lines interface sonar arrays, limit switches, and status LEDs on a single controller board.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для ATMEGA128L-8MU — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | ATMEGA1281V-8MU | ATMEGA1281V-8MUR | ATMEGA1281-16MUR |
|---|---|---|---|---|
| Package | 64-QFN / MLF (9x9 mm) | 64-QFN / MLF (9x9 mm) - same | 64-QFN / MLF (9x9 mm) - same | 64-QFN / MLF (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 16 MHz |
| Flash Memory | 128KB | 128KB | 128KB | 128KB |
| SRAM | 4KB | 8KB | 8KB | 8KB |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V |
| I/O Pins | 53 | 54 | 54 | 54 |
| Special Features | JTAG, 2 USART, SPI, TWI | JTAG, AES crypto module, PSC | JTAG, AES crypto module, PSC | JTAG, AES crypto module, PSC |
Ключевые отличия
- ATmega103 legacy compatibility with true pin compatibility (против ATMEGA1281V-8MU)
- Wider low-voltage range than the 16 MHz sibling (против ATMEGA1281-16MUR)
- Lower SRAM than the migration family (против ATMEGA1281V-8MU)
Заметки по проектированию
The 64-QFN/MLF package has a large exposed die pad on the underside that must be soldered to a grounded copper pour on the PCB for both thermal dissipation and mechanical reliability. The MLF (Micro Lead Frame) package is not a leaded QFN: perimeter pads are under the body edge, so specify a 0.5 mm-pitch land pattern with via fencing to ground. Inspect with X-ray or use sufficient stencil aperture design, since perimeter joints are not optically visible after reflow.
Decouple AVCC separately from VCC with an RC low-pass filter (e.g., 10 uH inductor or 100 ohm resistor plus 100 nF capacitor) to keep ADC noise low; connect AREF through a 100 nF capacitor to AGND and never drive it while the internal reference is selected. Place 100 nF ceramic capacitors at both VCC pins (21 and 52) as close to the pins as possible. At 8 MHz the current draw is modest, but brown-out detection should be enabled via fuse for 3.3V battery systems.
Two frequent traps: first, when migrating from ATmega103, the M103C fuse must be cleared to enable the full ATmega128 feature set (extended I/O map and added SRAM); second, the JTAG interface shares port F ADC pins 4-7, and JTAG stays enabled by default - either disable via the JTD bit or JTAGEN fuse, or ADC channels 4-7 will not work. Also remember that the 'MU' (MLF) and 'AU' (TQFP) suffixes have different land patterns and are not footprint interchangeable.
Информация о соответствии
FindIC lists the ATMEGA128L-8MU as GREEN (Microchip RoHS-compliant, halogen-free packaging). REACH and conflict-minerals declarations not present in provided data.
