ATMEGA128-16AC - 8-bit AVR MCU 16MHz 128KB Flash | Microchip
料号： ATMEGA128-16AC ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $11.9 | $11.90 |
| 10 | $10.71 | $107.10 |
| 100 | $9.04 | $904.00 |
| 500 | $8.15 | $4,075.00 |
| 1,000 | $7.34 | $7,340.00 |
ATMEGA128-16AC 概述
An 8-bit microcontroller is an integrated circuit that contains a processor core, memory, and programmable input/output peripherals on a single chip, executing control and data-processing tasks in embedded systems. Within the product hierarchy, the ATmega128 sits in the AVR ATmega family of enhanced RISC MCUs, which belongs to the broader class of general-purpose microcontrollers within semiconductor-based embedded processing. The AVR architecture executes most instructions in a single clock cycle, achieving throughput approaching 1 MIPS per MHz.
Key features of the ATMEGA128-16AC include 133 powerful AVR instructions with mostly single-cycle execution, 32 general-purpose working registers, 128KB of ISP Flash with 10,000 write-cycle endurance, 4KB EEPROM rated for 100,000 write cycles, and a rich peripheral set: two 8-bit and two 16-bit timers with PWM, two USARTs, SPI, TWI (I2C-compatible), an 8-channel 10-bit ADC, analog comparator, watchdog timer, and JTAG boundary-scan/on-chip-debug support.
Architecturally, the AVR uses a Harvard structure with separate program and data buses, allowing simultaneous Flash instruction fetch and data access. In-system programmability permits firmware updates after board assembly, and the boot Flash section supports self-programming for field upgrades.
Typical applications include industrial control and automation nodes, embedded instrumentation and test equipment, motor-control and power-supervision systems, and legacy embedded designs requiring extended 128KB program memory with 5V-tolerant I/O.
When designing with this part, remember the -16AC is the commercial temperature grade (0C to +70C); select the -16AI industrial grade for -40C to +85C environments, and budget for a 4.5V to 5.5V supply since 16MHz operation is not supported at 3.3V.
This page synthesizes distributor pricing, drop-in alternatives, complete 64-pin pinout data, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： ATMEGA128-16AC ——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： ATMEGA128-16AC （相同外形与封装尺寸） ——差异在于 Package, Communication Interfaces, Core Architecture, Operating Temperature, Supply Voltage Range.
快速对比工具——选择替代料号进行并排对比：
ATMEGA128A-16AU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATMEGA128-16AUR
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA128-16AI
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$5.9 / 个
查看数据手册 →ATMEGA128-16ML
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA1281-16MUR
✅ 直接替换✓ 有现货
$8.78 / 个
查看数据手册 →ATMEGA128-16AC 最大额定值与电气特性
| Core Architecture | AVR 8-bit enhanced RISC |
| Core Size | 8-bit |
| 最大时钟频率 | 16 MHz |
| Program Memory Size | 128 KB (64K x 16) Flash |
| Program Memory Type | In-System Programmable Flash |
| EEPROM Size | 4 KB |
| RAM Size | 4 KB SRAM |
| Number of I/O | 53 I/O lines |
| Supply Voltage Range | 4.5 V to 5.5 V |
| 工作温度 | 0C to +70C (commercial grade) |
| Timers | 2 x 8-bit, 2 x 16-bit with PWM |
| Communication Interfaces | 2 x USART, SPI, TWI (I2C-compatible) |
| ADC Resolution | 10-bit, 8 channels |
| Debug Interface | JTAG (boundary scan and on-chip debug) |
| 封装 | 64-TQFP (14x14 mm) |
| 安装类型 | Surface Mount |
| Data Converter | A/D 8x10-bit |
ATMEGA128-16AC 引脚配置
| 引脚 1 | PEN — Programming Enable (low during programming) |
| 引脚 2 | PE0 (RXD0/PDI) — Port E bit 0 / USART0 receive |
| 引脚 3 | PE1 (TXD0/PDO) — Port E bit 1 / USART0 transmit |
| 引脚 4 | PE2 (XCK0/AIN0) — Port E bit 2 / USART0 clock / analog comparator input |
| 引脚 5 | PE3 (OC3A/AIN1) — Port E bit 3 / Timer3 PWM output A / comparator input |
| 引脚 6 | PE4 (OC3B/INT4) — Port E bit 4 / Timer3 PWM output B / external interrupt 4 |
| 引脚 7 | PE5 (OC3C/INT5) — Port E bit 5 / Timer3 PWM output C / external interrupt 5 |
| 引脚 8 | PE6 (T3/INT6) — Port E bit 6 / Timer3 clock input / external interrupt 6 |
| 引脚 9 | PE7 (ICP3/INT7/CLKO) — Port E bit 7 / Timer3 input capture / interrupt 7 / clock out |
| 引脚 10 | PB0 (SS) — Port B bit 0 / SPI slave select |
| 引脚 11 | PB1 (SCK) — Port B bit 1 / SPI serial clock |
| 引脚 12 | PB2 (MOSI) — Port B bit 2 / SPI master data out |
| 引脚 13 | PB3 (MISO) — Port B bit 3 / SPI master data in |
| 引脚 14 | PB4 (OC0/PWM0) — Port B bit 4 / Timer0 PWM output |
| 引脚 15 | PB5 (OC1A) — Port B bit 5 / Timer1 PWM output A |
| 引脚 16 | PB6 (OC1B) — Port B bit 6 / Timer1 PWM output B |
| 引脚 17 | PB7 (OC2/OC1C) — Port B bit 7 / Timer2 PWM / Timer1 PWM output C |
| 引脚 18 | PG3 (TOSC2) — Port G bit 3 / Timer oscillator output (32kHz RTC crystal) |
| 引脚 19 | PG4 (TOSC1) — Port G bit 4 / Timer oscillator input |
| 引脚 20 | RESET — Reset input (active low) |
| 引脚 21 | VCC — Digital supply voltage |
| 引脚 22 | GND — Ground |
| 引脚 23 | XTAL2 — Crystal oscillator output |
| 引脚 24 | XTAL1 — Crystal oscillator input / external clock input |
| 引脚 25 | PD0 (SCL/INT0) — Port D bit 0 / TWI clock / external interrupt 0 |
| 引脚 26 | PD1 (SDA/INT1) — Port D bit 1 / TWI data / external interrupt 1 |
| 引脚 27 | PD2 (TXD1/INT2) — Port D bit 2 / USART1 transmit / interrupt 2 |
| 引脚 28 | PD3 (RXD1/INT3) — Port D bit 3 / USART1 receive / interrupt 3 |
| 引脚 29 | PD4 (ICP1) — Port D bit 4 / Timer1 input capture |
| 引脚 30 | PD5 (XCK1) — Port D bit 5 / USART1 external clock |
| 引脚 31 | PD6 (T1) — Port D bit 6 / Timer1 external clock input |
| 引脚 32 | PD7 (T2) — Port D bit 7 / Timer2 external clock input |
| 引脚 33 | PG0 (WR) — Port G bit 0 / external memory write strobe |
| 引脚 34 | PG1 (RD) — Port G bit 1 / external memory read strobe |
| 引脚 35 | PC0 (A8) — Port C bit 0 / external memory address bit 8 |
| 引脚 36 | PC1 (A9) — Port C bit 1 / external memory address bit 9 |
| 引脚 37 | PC2 (A10) — Port C bit 2 / external memory address bit 10 |
| 引脚 38 | PC3 (A11) — Port C bit 3 / external memory address bit 11 |
| 引脚 39 | PC4 (A12) — Port C bit 4 / external memory address bit 12 |
| 引脚 40 | PC5 (A13) — Port C bit 5 / external memory address bit 13 |
| 引脚 41 | PC6 (A14) — Port C bit 6 / external memory address bit 14 |
| 引脚 42 | PC7 (A15) — Port C bit 7 / external memory address bit 15 |
| 引脚 43 | PG2 (ALE) — Port G bit 2 / external memory address latch enable |
| 引脚 44 | VCC — Digital supply voltage |
| 引脚 45 | GND — Ground |
| 引脚 46 | PA7 (AD7) — Port A bit 7 / external memory address/data bit 7 |
| 引脚 47 | PA6 (AD6) — Port A bit 6 / external memory address/data bit 6 |
| 引脚 48 | PA5 (AD5) — Port A bit 5 / external memory address/data bit 5 |
| 引脚 49 | PA4 (AD4) — Port A bit 4 / external memory address/data bit 4 |
| 引脚 50 | PA3 (AD3) — Port A bit 3 / external memory address/data bit 3 |
| 引脚 51 | PA2 (AD2) — Port A bit 2 / external memory address/data bit 2 |
| 引脚 52 | PA1 (AD1) — Port A bit 1 / external memory address/data bit 1 |
| 引脚 53 | PA0 (AD0) — Port A bit 0 / external memory address/data bit 0 |
| 引脚 54 | PF0 (ADC0) — Port F bit 0 / ADC channel 0 |
| 引脚 55 | PF1 (ADC1) — Port F bit 1 / ADC channel 1 |
| 引脚 56 | PF2 (ADC2) — Port F bit 2 / ADC channel 2 |
| 引脚 57 | PF3 (ADC3) — Port F bit 3 / ADC channel 3 |
| 引脚 58 | PF4 (ADC4/TCK) — Port F bit 4 / ADC channel 4 / JTAG test clock |
| 引脚 59 | PF5 (ADC5/TMS) — Port F bit 5 / ADC channel 5 / JTAG test mode select |
| 引脚 60 | PF6 (ADC6/TDO) — Port F bit 6 / ADC channel 6 / JTAG test data out |
| 引脚 61 | PF7 (ADC7/TDI) — Port F bit 7 / ADC channel 7 / JTAG test data in |
| 引脚 62 | AREF — ADC reference voltage |
| 引脚 63 | AGND — Analog ground |
| 引脚 64 | AVCC — Analog supply voltage for port F and ADC |
典型应用
ATMEGA128-16AC 适用于 6 应用s: Industrial Control and Automation, Embedded Instrumentation and Test Equipment, Legacy AVR Design Maintenance, Motor Control and Actuator Systems, Communication Gateways and Serial Concentrators, Education and Hobbyist Development Platforms.
Industrial Control and Automation
The ATMEGA128-16AC fits industrial control nodes because its 53 I/O lines, four PWM-capable timers, and dual USARTs allow simultaneous sensor polling, actuator drive, and Modbus-style serial communication without external expanders. Its 128KB ISP Flash accommodates large state machines and field-updatable firmware via the boot-loader section, while the 4KB EEPROM retains calibration constants through power cycles. Operating from a 4.5V to 5.5V rail matches legacy 5V industrial signal levels, giving noise margin that 3.3V MCUs lack on long cable runs. The commercial 0C to +70C rating suits panel-mounted controllers; specify the -16AI grade for outdoor or unconditioned enclosures.
推荐
Embedded Instrumentation and Test Equipment
Bench instruments, data loggers, and custom test fixtures benefit from the ATMEGA128-16AC's 8-channel 10-bit ADC for multi-sensor acquisition and its JTAG port for in-circuit debugging during development. The 16MHz AVR core delivers roughly 16 MIPS, sufficient for local averaging, threshold comparison, and menu-driven user interfaces on character LCDs via TWI or parallel buses. The external memory interface (ports A, C, and PG0-PG2 ALE/WR/RD pins) can address external SRAM beyond the internal 4KB when long acquisition buffers are required. Its 100,000-cycle EEPROM endurance suits measurement calibration storage in instruments recalibrated periodically.
推荐
Legacy AVR Design Maintenance
Thousands of shipping products were built around the original ATmega128 and now need continued sourcing as the original die becomes harder to buy in volume. The ATMEGA128-16AC and its drop-in successor ATMEGA128A-16AU keep such boards serviceable without any PCB change: same 64-TQFP footprint, same pinout, same register map, and same ISP programming flow through SPI. Rochester Electronics also supplies original-die parts for long-tail programs. Engineering teams maintaining legacy firmware should validate the boot-loader flash procedure on the ATmega128A, whose boot section timing is marginally faster on the new process, then standardize on the A-variant for future builds.
推荐
Motor Control and Actuator Systems
With two 8-bit and two 16-bit timers offering multiple PWM outputs (OC0, OC1A/B/C, OC2, OC3A/B/C), the ATMEGA128-16AC can drive brushed DC, stepper, and small three-phase actuator stages directly at 5V logic. The external interrupt pins INT0-INT7 plus the analog comparator support encoder feedback and over-current trip logic with hardware latency below one timer clock. Running at 16MHz gives 1 MIPS-per-MHz throughput for executing PID loops at multi-kilohertz rates in C. Gate-driver ICs on the SPI bus extend the MCU to power MOSFET half-bridges, while the watchdog timer enforces fail-safe shutdown if firmware hangs.
推荐
Communication Gateways and Serial Concentrators
The two independent hardware USARTs on the ATMEGA128-16AC make it a natural protocol bridge: for example, translating RS-485 Modbus RTU on one port to RS-232 diagnostics on the other, or combining multiple field devices into a single upstream link. Hardware SPI and TWI add two more simultaneous buses for sensors, RTCs, and EEPROMs without software bit-banging overhead. The 128KB Flash holds generous protocol stacks, and the boot section permits field firmware updates over the serial link, minimizing maintenance trips. The 5V I/O directly drives optocoupler-based RS-485 front ends commonly used in industrial networks.
推荐
Education and Hobbyist Development Platforms
The ATmega128 remains popular in university embedded-systems courses and hobbyist platforms because AVR toolchains (AVR-GCC, avrdude, and Arduino-compatible cores such as MegaCore for ATmega128) are free and mature. The JTAG port allows students to set breakpoints and inspect registers in real hardware, a capability many modern MCUs gate behind proprietary debuggers. Its through-documented 5V operation tolerates wiring mistakes better than 3.3V parts, and the 64-pin TQFP on adapter boards is approachable for breadboard prototyping. The 133-instruction RISC set is small enough to teach assembly fundamentals yet powerful enough for term projects spanning displays, sensors, and motors.
推荐
推荐产品汇总
工程参考数据： ATMEGA128-16AC ——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 | ATMEGA128A-16AU | ATMEGA128-16AUR | ATMEGA128-16AI | ATMEGA128-16ML | ATMEGA1281-16MUR |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (14x14) | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same | 64-TQFP (14x14) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Max Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 8 KB |
| Pin Compatibility | Reference (ATmega128 pinout) | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible | Pin-to-pin compatible | Different peripheral mapping - verify before reuse |
关键差异点
- Lower power consumption on the newer process （对比 ATMEGA128-16AC (baseline))
- Extended temperature range for harsh environments （对比 ATMEGA128-16AUR)
- Legacy-silicon sourcing continuity （对比 ATMEGA1281-16MUR)
设计说明
Supply the ATMEGA128-16AC from a clean 4.5V to 5.5V rail; 16MHz operation is only qualified at 5V-class voltages per the Microchip datasheet speed-versus-voltage curve. Place 100nF ceramic decoupling capacitors at both VCC pins (21 and 44) within 5 mm of each pin, plus a 10uF bulk capacitor near the regulator. Tie AVCC (pin 64) to VCC through a 10uH LC filter when ADC accuracy matters, and never leave AVCC below VCC - the datasheet warns AVCC must not exceed VCC by more than 0.3V.
Connect AGND (pin 63) to a star-ground point shared with the ADC reference return path to keep switching currents out of the analog domain. Use AREF (pin 62) with a 100nF capacitor to AGND; do not connect an external reference while the internal reference is enabled. Keep the XTAL1/XTAL2 crystal traces short and ring them with a ground guard. Because JTAG shares PF4-PF7 with ADC4-ADC7, plan pin usage early: program the JTAGEN fuse off only after confirming no debugger access is needed.
Do not attempt 16MHz operation below 4.5V - overclocking below the datasheet voltage curve causes marginal Flash execution and intermittent resets. PEN (pin 1) must be pulled high through a 10k resistor for normal operation; only pull it low during high-voltage parallel programming. RESET is active low with an internal pull-up, but add an external 10k pull-up and 100nF cap for noisy environments. When migrating to ATMEGA128A-16AU, re-verify boot-loader flash timing since the newer die writes marginally faster.
合规信息
Compliance status not stated in the provided Verified Web Data; confirm RoHS/REACH/lead-free status on the Microchip product page or certificate of conformance before procurement.