ATMEGA128L-8MU - 8MHz AVR MCU 128KB Flash QFN-64 | Microchip
料号： ATMEGA128L-8MU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： ATMEGA128L-8MU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATMEGA128L-8MU （相同外形与封装尺寸） ——差异在于 Package, Timers/Counters, SRAM, Instructions, Debug Interface.
快速对比工具——选择替代料号进行并排对比：
ATMEGA1281V-8MU
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$5.92 / 个
查看数据手册 →ATMEGA1281V-8MUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.02 / 个
查看数据手册 →ATMEGA1281-16MUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$8.78 / 个
查看数据手册 →ATMEGA128L-8MU 最大额定值与电气特性
| Core Architecture | 8-bit AVR RISC |
| Max Clock Speed | 8 MHz |
| Program Memory (Flash) | 128KB (64K x 16) |
| SRAM | 4KB |
| EEPROM | 4KB |
| 电源电压 | 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) |
| 封装 | 64-QFN / MLF (9 x 9 mm) |
| 安装类型 | Surface Mount |
| 工作温度 | Industrial (-40C to +85C) |
| Series | AVR ATmega |
| RoHS 状态 | Compliant (GREEN per FindIC listing) |
| Lifecycle Stage | Active |
ATMEGA128L-8MU 引脚配置
| 引脚 1 | PEN — Programming Enable (serial program and debug) |
| 引脚 2 | PE0 (RXD0/PDI) — USART0 receive / programming data in |
| 引脚 3 | PE1 (TXD0/PDO) — USART0 transmit / programming data out |
| 引脚 4 | PE2 (XCK0/AIN0) — USART0 clock / analog comparator input 0 |
| 引脚 5 | PE3 (OC3A/AIN1) — Timer3 output compare A / comparator input 1 |
| 引脚 6 | PE4 (OC3B/INT4) — Timer3 output compare B / external interrupt 4 |
| 引脚 7 | PE5 (OC3C/INT5) — Timer3 output compare C / external interrupt 5 |
| 引脚 8 | PE6 (T3/INT6) — Timer3 clock input / external interrupt 6 |
| 引脚 9 | PE7 (ICP3/INT7) — Timer3 input capture / external interrupt 7 |
| 引脚 10 | PB0 (SS) — SPI slave select / general I/O |
| 引脚 11 | PB1 (SCK) — SPI clock / general I/O |
| 引脚 12 | PB2 (MOSI) — SPI master data out / general I/O |
| 引脚 13 | PB3 (MISO) — SPI master data in / general I/O |
| 引脚 14 | PB4 (OC0) — Timer0 output compare / PWM |
| 引脚 15 | PB5 (OC1A) — Timer1 output compare A / PWM |
| 引脚 16 | PB6 (OC1B) — Timer1 output compare B / PWM |
| 引脚 17 | PB7 (OC2/OC1C) — Timer2 output compare / Timer1 output compare C |
| 引脚 18 | PG3 (TOSC2) — Timer oscillator output (32 kHz RTC crystal) |
| 引脚 19 | PG4 (TOSC1) — Timer oscillator input (32 kHz RTC crystal) |
| 引脚 20 | RESET — Reset input (active low) |
| 引脚 21 | VCC — Digital supply voltage |
| 引脚 22 | GND — Digital ground |
| 引脚 23 | XTAL2 — System crystal oscillator output |
| 引脚 24 | XTAL1 — System crystal oscillator input |
| 引脚 25 | PD0 (SCL/INT0) — TWI clock / external interrupt 0 |
| 引脚 26 | PD1 (SDA/INT1) — TWI data / external interrupt 1 |
| 引脚 27 | PD2 (RXD1/INT2) — USART1 receive / external interrupt 2 |
| 引脚 28 | PD3 (TXD1/INT3) — USART1 transmit / external interrupt 3 |
| 引脚 29 | PD4 (ICP1) — Timer1 input capture |
| 引脚 30 | PD5 (XCK1) — USART1 external clock |
| 引脚 31 | PD6 (T1) — Timer1 external counter input |
| 引脚 32 | PD7 (T2) — Timer2 external counter input |
| 引脚 33 | PG0 (WR) — External memory write strobe |
| 引脚 34 | PG1 (RD) — External memory read strobe |
| 引脚 35 | PC0 (A8) — External memory address line 8 / general I/O |
| 引脚 36 | PC1 (A9) — External memory address line 9 / general I/O |
| 引脚 37 | PC2 (A10) — External memory address line 10 / general I/O |
| 引脚 38 | PC3 (A11) — External memory address line 11 / general I/O |
| 引脚 39 | PC4 (A12) — External memory address line 12 / general I/O |
| 引脚 40 | PC5 (A13) — External memory address line 13 / general I/O |
| 引脚 41 | PC6 (A14) — External memory address line 14 / general I/O |
| 引脚 42 | PC7 (A15) — External memory address line 15 / general I/O |
| 引脚 43 | PG2 (ALE) — External memory address latch enable |
| 引脚 44 | PA7 (AD7) — External memory address/data line 7 / general I/O |
| 引脚 45 | PA6 (AD6) — External memory address/data line 6 / general I/O |
| 引脚 46 | PA5 (AD5) — External memory address/data line 5 / general I/O |
| 引脚 47 | PA4 (AD4) — External memory address/data line 4 / general I/O |
| 引脚 48 | PA3 (AD3) — External memory address/data line 3 / general I/O |
| 引脚 49 | PA2 (AD2) — External memory address/data line 2 / general I/O |
| 引脚 50 | PA1 (AD1) — External memory address/data line 1 / general I/O |
| 引脚 51 | PA0 (AD0) — External memory address/data line 0 / general I/O |
| 引脚 52 | VCC — Digital supply voltage |
| 引脚 53 | GND — Digital ground |
| 引脚 54 | PF0 (ADC0) — ADC input 0 / general I/O |
| 引脚 55 | PF1 (ADC1) — ADC input 1 / general I/O |
| 引脚 56 | PF2 (ADC2) — ADC input 2 / general I/O |
| 引脚 57 | PF3 (ADC3) — ADC input 3 / general I/O |
| 引脚 58 | PF4 (ADC4/TCK) — ADC input 4 / JTAG test clock |
| 引脚 59 | PF5 (ADC5/TMS) — ADC input 5 / JTAG test mode select |
| 引脚 60 | PF6 (ADC6/TDO) — ADC input 6 / JTAG test data out |
| 引脚 61 | PF7 (ADC7/TDI) — ADC input 7 / JTAG test data in |
| 引脚 62 | AREF — ADC analog reference voltage |
| 引脚 63 | AGND — Analog ground |
| 引脚 64 | AVCC — ADC supply voltage |
典型应用
ATMEGA128L-8MU 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ATMEGA128L-8MU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- ATmega103 legacy compatibility with true pin compatibility （对比 ATMEGA1281V-8MU)
- Wider low-voltage range than the 16 MHz sibling （对比 ATMEGA1281-16MUR)
- Lower SRAM than the migration family （对比 ATMEGA1281V-8MU)
设计说明
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.
合规信息
FindIC lists the ATMEGA128L-8MU as GREEN (Microchip RoHS-compliant, halogen-free packaging). REACH and conflict-minerals declarations not present in provided data.
