ATMEGA128L-8AC - 8-bit AVR MCU, 128KB Flash, 8MHz, 64-TQFP | Microchip
料号： ATMEGA128L-8AC ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.4 | $164.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $12.1 | $6,050.00 |
| 1,000 | $10.85 | $10,850.00 |
ATMEGA128L-8AC 概述
An 8-bit microcontroller (MCU) is a programmable logic device that integrates a CPU, memory (Flash, SRAM, EEPROM), and peripherals (ADC, timers, communication interfaces) on a single silicon die. Within the broader taxonomy, the ATMEGA128L belongs to the AVR RISC microcontroller family, which in turn is part of the embedded microcontroller category, sitting under microcontrollers and integrated circuits in the electronic component hierarchy. ATmega devices specifically use a modified Harvard architecture with separate program and data buses plus a dedicated EEPROM bus, an arrangement that lets the CPU fetch instructions while reading or writing EEPROM in the same cycle - ideal for data-logging applications.
Key features of the ATMEGA128L-8AC include 53 general-purpose I/O lines, 32 general-purpose working registers, an 8-channel 10-bit ADC, two USARTs, a byte-oriented Two-Wire Serial Interface (TWI, I2C-compatible), an SPI serial interface, four flexible Timer/Counters with compare modes and PWM, a real-time counter with separate oscillator, a JTAG interface for on-chip debug, six sleep modes for power optimization, and a watchdog timer with on-chip oscillator. The 64-pin TQFP (14x14) surface-mount package provides 53 usable I/O pins with the remainder allocated to power, ground, reset, crystal, and JTAG signals.
The die uses an enhanced RISC architecture with 133 powerful instructions, most executed in a single clock cycle, enabling deterministic interrupt latency and code-density advantages over CISC alternatives. The internal bandgap reference, brown-out detector, and on-chip debug logic reduce external component count. The 'L' suffix designates the low-voltage variant (2.7V-5.5V), distinguished from the standard ATMEGA128 (4.5V-5.5V); the 'C' suffix indicates the commercial 0C to +70C temperature range, and the 'AC' suffix the TQFP package.
Typical applications include industrial control systems, building automation, HVAC controllers, low-power sensor nodes, data loggers, and battery-powered instrumentation where the 2.7V-5.5V supply range and six programmable sleep modes (down to sub-microamp standby currents typical of L-grade devices) provide extended battery life. The 128KB of Flash and 4KB EEPROM enable substantial on-board firmware storage with non-volatile parameter retention across power cycles.
When designing with this part, plan ISP (In-System Programming) header accessibility from the start: the MOSI, MISO, SCK, and RESET pins must reach an external header for field updates. The L-grade 2.7V minimum also means brown-out detection (BOD) thresholds must be configured correctly - the default BOD level is below the safe minimum for 8 MHz operation and should be raised via fuses for production firmware.
This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes that go beyond the Atmel/Microchip datasheet coverage.
直接替换替代料： ATMEGA128L-8AC ——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-8AC （相同外形与封装尺寸） ——差异在于 Package, Operating Temperature, RoHS Status, Supply Voltage Range, ADC.
快速对比工具——选择替代料号进行并排对比：
ATMEGA128L-8AU
✅ 直接替换✓ 有现货
$23.49 / 个
查看数据手册 →ATMEGA128L-8AI
✅ 直接替换✓ 有现货
$6.6 / 个
查看数据手册 →ATMEGA128L-8MC
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
联系询价
查看数据手册 →ATMEGA128A-MU
✅ 直接替换✓ 有现货
$5.2 / 个
查看数据手册 →ATMEGA1284-AU
✅ 直接替换✓ 有现货
$7.8934 / 个
查看数据手册 →ATMEGA128L-8AC 最大额定值与电气特性
| Core Architecture | AVR RISC (enhanced 8-bit) |
| Program Memory (Flash) | 128 KB (64K x 16) |
| SRAM | 4 KB |
| EEPROM | 4 KB |
| 最大时钟频率 | 8 MHz |
| Operating Voltage (L-grade) | 2.7 V to 5.5 V |
| MIPS Throughput | Up to 8 MIPS at 8 MHz |
| Instruction Set | 133 instructions, mostly single-cycle |
| General-Purpose I/O Pins | 53 |
| General-Purpose Registers | 32 |
| ADC | 10-bit, 8-channel |
| USART | 2 |
| Two-Wire Interface (I2C) | 1 (byte-oriented) |
| SPI | 1 |
| Timer/Counters | 4 (with compare and PWM) |
| Watchdog Timer | Yes (with on-chip oscillator) |
| 封装 | 64-pin TQFP (14x14 mm) |
| 工作温度 | 0 C to +70 C (commercial, 'C' suffix) |
| 安装类型 | Surface Mount |
| JTAG Debug Interface | Yes (IEEE 1149.1 compliant) |
| RoHS 状态 | Compliant (lead-free 'AC' suffix) |
ATMEGA128L-8AC 引脚配置
| 引脚 1 | AVCC — Analog supply voltage for ADC |
| 引脚 2 | PE0 (RXD0/PDI) — Port E bit 0, USART0 RXD, PDI |
| 引脚 3 | PE1 (TXD0/PDO) — Port E bit 1, USART0 TXD, PDO |
| 引脚 4 | PE2 (XCK0/AIN0) — Port E bit 2, USART0 clock, analog input |
| 引脚 5 | PE3 (OC3A/AIN1) — Port E bit 3, Timer3 output compare A, analog input |
| 引脚 6 | PE4 (OC3B/INT4) — Port E bit 4, Timer3 output compare B, interrupt 4 |
| 引脚 7 | PE5 (OC3C/INT5) — Port E bit 5, Timer3 output compare C, interrupt 5 |
| 引脚 8 | PE6 (T3/INT6) — Port E bit 6, Timer3 input, interrupt 6 |
| 引脚 9 | PE7 (ICP3/INT7) — Port E bit 7, Timer3 input capture, interrupt 7 |
| 引脚 10 | VCC — Digital supply voltage |
| 引脚 11 | GND — Digital ground |
| 引脚 12 | XTAL2 — Crystal oscillator output |
| 引脚 13 | XTAL1 — Crystal oscillator input |
| 引脚 14 | RESET — Reset input (active low) |
| 引脚 15 | VCC — Digital supply voltage |
| 引脚 16 | GND — Digital ground |
| 引脚 17 | PA0 (AD0) — Port A bit 0, ADC input channel 0 |
| 引脚 18 | PA1 (AD1) — Port A bit 1, ADC input channel 1 |
| 引脚 19 | PA2 (AD2) — Port A bit 2, ADC input channel 2 |
| 引脚 20 | PA3 (AD3) — Port A bit 3, ADC input channel 3 |
| 引脚 21 | PA4 (AD4) — Port A bit 4, ADC input channel 4 |
| 引脚 22 | PA5 (AD5) — Port A bit 5, ADC input channel 5 |
| 引脚 23 | PA6 (AD6) — Port A bit 6, ADC input channel 6 |
| 引脚 24 | PA7 (AD7) — Port A bit 7, ADC input channel 7 |
| 引脚 25 | AREF — ADC reference voltage |
| 引脚 26 | AVCC — Analog supply voltage for ADC |
| 引脚 27 | GND — Analog ground |
| 引脚 28 | PB0 (SS/) — Port B bit 0, SPI slave select |
| 引脚 29 | PB1 (SCK) — Port B bit 1, SPI clock |
| 引脚 30 | PB2 (MOSI) — Port B bit 2, SPI master out |
| 引脚 31 | PB3 (MISO) — Port B bit 3, SPI master in |
| 引脚 32 | PB4 (OC0) — Port B bit 4, Timer0 compare output |
| 引脚 33 | PB5 (OC1A) — Port B bit 5, Timer1 compare A output |
| 引脚 34 | PB6 (OC1B) — Port B bit 6, Timer1 compare B output |
| 引脚 35 | PB7 (OC2/OC1C) — Port B bit 7, Timer2/1 compare C output |
| 引脚 36 | PC0 (SCL) — Port C bit 0, TWI clock |
| 引脚 37 | PC1 (SDA) — Port C bit 1, TWI data |
| 引脚 38 | PC2 (TCK) — Port C bit 2, JTAG TCK |
| 引脚 39 | PC3 (TMS) — Port C bit 3, JTAG TMS |
| 引脚 40 | PC4 (TDO) — Port C bit 4, JTAG TDO |
| 引脚 41 | PC5 (TDI) — Port C bit 5, JTAG TDI |
| 引脚 42 | PC6 (TOSC1) — Port C bit 6, Timer0 oscillator pin 1 |
| 引脚 43 | PC7 (TOSC2) — Port C bit 7, Timer0 oscillator pin 2 |
| 引脚 44 | PD0 (RXD1/INT0) — Port D bit 0, USART1 RXD, interrupt 0 |
| 引脚 45 | PD1 (TXD1/INT1) — Port D bit 1, USART1 TXD, interrupt 1 |
| 引脚 46 | PD2 (INT2) — Port D bit 2, interrupt 2 |
| 引脚 47 | PD3 (INT3) — Port D bit 3, interrupt 3 |
| 引脚 48 | PD4 (ICP1) — Port D bit 4, Timer1 input capture |
| 引脚 49 | PD5 (XCK1) — Port D bit 5, USART1 clock |
| 引脚 50 | PD6 (T1) — Port D bit 6, Timer1 external clock |
| 引脚 51 | PD7 (T2) — Port D bit 7, Timer2 external clock |
| 引脚 52 | PF0 (ADC0/T0) — Port F bit 0, ADC input 0, Timer0 |
| 引脚 53 | PF1 (ADC1/T1) — Port F bit 1, ADC input 1, Timer1 |
| 引脚 54 | PF2 (ADC2) — Port F bit 2, ADC input 2 |
| 引脚 55 | PF3 (ADC3) — Port F bit 3, ADC input 3 |
| 引脚 56 | PF4 (ADC4/TCK) — Port F bit 4, ADC input 4, JTAG TCK |
| 引脚 57 | PF5 (ADC5/TMS) — Port F bit 5, ADC input 5, JTAG TMS |
| 引脚 58 | PF6 (ADC6/TDO) — Port F bit 6, ADC input 6, JTAG TDO |
| 引脚 59 | PF7 (ADC7/TDI) — Port F bit 7, ADC input 7, JTAG TDI |
| 引脚 60 | GND — Digital ground |
| 引脚 61 | VCC — Digital supply voltage |
| 引脚 62 | PG0 (WR/) — Port G bit 0, external write strobe |
| 引脚 63 | PG1 (RD/) — Port G bit 1, external read strobe |
| 引脚 64 | PG2 (ALE) — Port G bit 2, address latch enable |
典型应用
ATMEGA128L-8AC 适用于 6 应用s: Industrial Control and Automation, Building Automation and HVAC Controllers, Low-Power Sensor Data Loggers, Human-Machine Interface Panels, Point-of-Sale Terminals and Peripherals, Educational and Development Boards.
Industrial Control and Automation
The ATMEGA128L-8AC fits industrial control applications because its 128KB Flash, 4KB SRAM, and 53 GPIO lines support multi-protocol control loops, while the L-grade 2.7V to 5.5V supply tolerance handles 24V industrial bus rails stepped down via simple regulators. The dual USART enables RS-232/RS-485 master/slave bridging simultaneously, the Two-Wire Interface drives I2C sensor clusters, and the 8-channel 10-bit ADC reads 4-20 mA process signals directly through shunt resistors. The 8 MHz clock at full MIPS keeps deterministic loop times for PID control. The commercial 0C-70C temperature rating suits factory-floor environments; for outdoor or refrigerated cabinets, drop in the ATMEGA128L-8AI or 8AU industrial-grade alternative without PCB rework.
推荐
Building Automation and HVAC Controllers
The ATMEGA128L-8AC is well matched to building automation controllers where the 128KB Flash stores full BACnet or Modbus protocol stacks alongside the HVAC control application code, while 4KB EEPROM retains setpoints and schedules across power loss. Its 53 I/O pins drive multiple relay banks, triac outputs for AC loads, and 0-10V analog outputs without external I/O expanders, reducing PCB area. The dual USART supports both a touch-panel HMI and the building trunk simultaneously. Six programmable sleep modes let battery-backed thermostats achieve multi-year battery life. The 8 MHz clock and 2.7V-5.5V L-grade supply accommodate direct 3.3V or 5V regulation from a small switching converter or a linear regulator.
推荐
Low-Power Sensor Data Loggers
The ATMEGA128L-8AC is ideal for battery-powered sensor data loggers because its six programmable sleep modes (Power-down, Power-save, Standby) lower quiescent current to microamp levels when the main oscillator is gated and an asynchronous timer on a 32 kHz crystal handles wake-up scheduling. The 4KB EEPROM stores calibration tables and recent log entries across months of battery operation, while the 128KB Flash holds the data logging firmware with compression and statistics routines. The 8-channel 10-bit ADC samples thermocouples, pressure, and humidity sensors directly. The L-grade 2.7V minimum allows two AA alkaline cells or a 3.6V Li-SOCl2 primary cell to power the logger, simplifying field deployment and eliminating solar or wall power.
推荐
Human-Machine Interface Panels
The ATMEGA128L-8AC suits HMI display panels because its 128KB Flash stores full color graphics libraries plus locale strings and menu trees, while 4KB SRAM buffers partial screen refreshes during fast UI updates. The SPI port drives TFT displays directly at 8 MHz, the Two-Wire Interface hosts I2C touch controllers, and the dual USART bridges to a backhaul Modbus or CAN node. The 53 GPIO pins directly drive key matrices, LED status indicators, and buzzer drivers. Its JTAG interface accelerates development on iterative HMI firmware revisions. The L-grade supply range supports 3.3V TFT logic without additional level translation, while the commercial 0-70C range is adequate for indoor enclosures.
推荐
Point-of-Sale Terminals and Peripherals
The ATMEGA128L-8AC supports POS peripheral controllers because its 128KB Flash accommodates EMV, ISO 7816, and NFC stack libraries alongside payment application code, while the dual USART handles simultaneous magnetic-stripe readers and encrypted PIN-pad interfaces. The 53 GPIO pins drive key matrices, multi-color status LEDs, and thermal printer stepper-motor phases without auxiliary logic. The 8-channel 10-bit ADC reads battery voltage and tamper switches. Six sleep modes keep handheld payment terminals alive for entire shifts between charges. The L-grade voltage range accommodates single-cell Li-ion or Li-Polymer supply rails directly, simplifying power tree design in compact form factors.
推荐
Educational and Development Boards
The ATMEGA128L-8AC is well suited to educational boards and engineering development kits because its 128KB Flash, comprehensive peripheral set (USART/SPI/TWI/JTAG), and JTAG debug interface provide a complete learning platform for 8-bit embedded design. The dual USART supports debug-print bridges and external peripheral simulation simultaneously, while 53 GPIO pins let students explore interrupt-driven I/O, timer PWM, and ADC sampling without resource conflicts. The L-grade voltage tolerance allows USB bus-powered operation through a 3.3V LDO. The same TQFP-64 footprint shared with ATMEGA128A-MU and ATMEGA1284-AU lets a single PCB target multiple tiers, supporting progressive firmware development from 8 MHz to 16 MHz across the family.
推荐
推荐产品汇总
工程参考数据： ATMEGA128L-8AC ——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 | ATMEGA128L-8AU | ATMEGA128L-8AI | ATMEGA128L-8MC | ATMEGA128A-MU | ATMEGA1284-AU |
|---|---|---|---|---|---|---|
| Package | TQFP-64 (14x14) | TQFP-64 (14x14) - same | TQFP-64 (14x14) - same | TQFP-64 (14x14) - same | QFN-64 (MLF) - footprint-migrated | TQFP-64 (14x14) - same |
| Brand | Microchip Technology (formerly Atmel) | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| Maximum Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 16 MHz | 20 MHz |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 16 KB |
| EEPROM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Operating Voltage | 2.7V to 5.5V (L-grade) | 2.7V to 5.5V (L-grade) | 2.7V to 5.5V (L-grade) | 2.7V to 5.5V (L-grade) | 2.7V to 5.5V | 2.7V to 5.5V (low-voltage variant) |
| Temperature Range | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C | -40C to +85C (industrial) | -40C to +85C (industrial) |
| GPIO Pins | 53 | 53 | 53 | 53 | 53 | 36 |
关键差异点
- Low-voltage 2.7V minimum supply enables direct battery operation （对比 ATMEGA128A-MU)
- Commercial-grade TQFP-64 is the lowest-cost surface-mount option in the ATmega128 family （对比 ATMEGA128L-8AU)
- Same AVR instruction set and toolchain across the family （对比 ATMEGA1284-AU)
设计说明
Estimated: At 3.3V VCC, 8 MHz active, the ATMEGA128L-8AC draws roughly 6-10 mA active and sub-1 uA in Power-down mode (typical Microchip AVR L-grade curves). Connect both AVCC pins to a 100 nF + 10 uF bypass capacitor pair and place decoupling as close to each VCC pin as possible; AVCC must never exceed VCC + 0.3V or ADC readings will be corrupted. For battery applications, gate analog power through a MOSFET driven by a dedicated GPIO to achieve <1 uA analog-block standby when the ADC is disabled. Confirm the active current with the Microchip ATmega128 datasheet electrical characteristics table (typical values, not minimum).
Route the JTAG signals (TCK/TMS/TDO/TDI on PORTC and PORTF) with short traces and a ground reference for noise immunity; JTAG clock errors are the most common cause of debug failures. Place the ISP header with MOSI/MISO/SCK/RESET accessible without crossing analog signals. The TQFP-64 thermal pad (center pad) should be soldered to a copper pour with thermal vias to ground for improved thermal dissipation, although L-grade parts rarely need more than natural PCB cooling.
Brown-out detection (BOD) defaults to a low threshold that is below the minimum for 8 MHz operation. Set BODLEVEL fuses to 2.7V minimum for L-grade parts, otherwise the chip may execute erratically when battery voltage sags below the safe operating region. The internal 32 kHz oscillator TOSC1/TOSC2 pins must be disabled if a 32 kHz crystal is not installed, otherwise the chip may fail to start in Power-save mode. The 'AC' suffix denotes a commercial-grade TQFP package, not a 'C' variant for some other manufacturer - do not confuse with industrial 'AI' or 'AU' suffixes; the silicon die is identical across the family.
Keep the 8 MHz crystal trace lengths under 10 mm and surround with a quiet ground guard ring; the high-impedance XTAL pins are highly susceptible to noise. Place the ISP and JTAG connectors on the edge of the PCB for production programming access without removing shields. Route PORTA and PORTF (ADC inputs) as short analog nets surrounded by analog ground; mix digital and analog ground only at a single point near the AVCC pin decoupling capacitor. This prevents digital switching noise from coupling into ADC samples when reading small signals.
合规信息
RoHS compliant per Microchip product page; the 'C'/'A' suffix indicates lead-free TQFP package. AEC-Q100 not applicable - this is a commercial-grade MCU. Industrial variants (-40C to +85C) are available as ATMEGA128L-8AI/-8AU without PCB changes.
