ATMEGA103-6AI - 8-Bit AVR MCU, 6MHz, 128KB Flash | Microchip
料号： ATMEGA103-6AI ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.4 | $114.00 |
| 100 | $10.25 | $1,025.00 |
| 500 | $9.4 | $4,700.00 |
| 1,000 | $8.6 | $8,600.00 |
ATMEGA103-6AI 概述
An AVR microcontroller is a class of 8-bit Harvard-architecture MCUs in which program memory and data memory occupy separate address spaces, allowing most instructions to execute in a single clock cycle. Within the power-management hierarchy, the ATmega103 sits in the high-memory general-purpose microcontroller tier, sitting above the ATmega603 (64 KB Flash) sibling and pre-dating the pin-compatible ATmega128.
Key features include the AVR enhanced RISC core with 121 powerful instructions (most single-cycle), 128 KB in-system reprogrammable Flash, 4 KB internal SRAM, 4 KB EEPROM, an 8-channel 10-bit ADC, UART, SPI, and a wide -40C to +85C industrial operating temperature range denoted by the 'I' suffix in the part number. The 6 MHz speed grade ('6') covers 5V operation.
Architecturally, the ATmega103 uses a low-power CMOS process with a fast-access RISC register file of 32 general-purpose 8-bit registers directly connected to the ALU, enabling single-cycle execution that yields throughput of roughly 6 MIPS at 6 MHz. Nonvolatile memory is organized for in-system reprogramming via SPI, and the memory map includes external memory expansion capability.
Typical applications include legacy industrial control systems, building automation controllers, instrumentation, and embedded products designed in the late 1990s and early 2000s that still require AVR compatibility at the 128 KB memory point.
Design consideration: because this is a 5V-only part with a 6 MHz ceiling, new designs should evaluate the pin-compatible, higher-performance ATmega128 family instead; ATmega103-mode compatibility is retained in the ATmega128 via an M103C fuse.
This page consolidates distributor pricing, drop-in alternative cross-references, and practical migration design notes not found together on the manufacturer datasheet.
直接替换替代料： ATMEGA103-6AI ——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： ATMEGA103-6AI （相同外形与封装尺寸） ——差异在于 Operating Temperature, Maximum Clock Frequency, SRAM, Core Architecture, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
ATMEGA128-16AU
✅ 直接替换✓ 有现货
$14.3 / 个
查看数据手册 →ATMEGA128-16AUR
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA1281-16AU
✅ 直接替换✓ 有现货
$8.27 / 个
查看数据手册 →ATMEGA103L-4AI
✅ 直接替换✓ 有现货
$11.1 / 个
查看数据手册 →ATMEGA103-6AC
✅ 直接替换✓ 有现货
$8.2 / 个
查看数据手册 →ATMEGA103-6AI 最大额定值与电气特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Architecture | AVR Enhanced RISC |
| Instruction Count | 121 instructions |
| 最大时钟频率 | 6 MHz |
| Flash Program Memory | 128 KB (64K x 16), In-System Programmable |
| SRAM | 4 KB |
| EEPROM | 4 KB |
| 电源电压 | 5 V |
| 工作温度 | -40C to +85C |
| 封装 | 64-TQFP (14x14 mm) |
| 安装类型 | Surface Mount |
| ADC | 8-channel 10-bit |
| Interfaces | UART, SPI |
| Peripherals | External Memory Interface, PWM, WDT |
ATMEGA103-6AI 64-tqfp (14x14 mm) 引脚配置指南
ATMEGA103-6AI（64-tqfp (14x14 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATMEGA103-6AI.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA103-6AI 适用于 6 应用s: Legacy Industrial Control Systems, Building Automation Controllers, Test and Measurement Instrumentation, Embedded Legacy Maintenance and Repair, Automotive Off-Highway Retrofit Modules, RF and Telemetry Data Loggers.
Legacy Industrial Control Systems
The ATMEGA103-6AI was widely designed into industrial PLC-style controllers, motor control boards, and process instrumentation during the late 1990s. Its 128 KB Flash accommodates substantial control state machines while the 4 KB SRAM handles buffering and the 4 KB EEPROM preserves calibration parameters across power cycles. The -40C to +85C industrial temperature grade and 5V noise-immune logic levels fit electrically harsh factory environments where 24V-derived signals and relay switching are common. The 8-channel 10-bit ADC directly digitizes sensor inputs such as temperature and pressure transmitters, and the UART provides a robust link to HMI panels or SCADA gateways. For continued maintenance of these installed systems, the pin-compatible ATmega128 offers a direct sourcing path.
推荐
Building Automation Controllers
HVAC controllers, access-control panels, and lighting-management nodes from this era commonly used the ATmega103 because its 128 KB Flash held protocol stacks (Modbus, custom serial protocols) plus schedules, while EEPROM retained network addresses and setpoints without battery backup. The 6 MHz core is sufficient for polling-based fieldbus communication over the UART at standard baud rates, and the SPI interface connects to real-time clocks and display drivers. The 5V supply simplifies interfacing with opto-isolated RS-485 transceivers typical of multi-drop building networks. Its wide temperature range supports rooftop and mechanical-room installations where ambient temperatures swing well beyond commercial limits, ensuring timing and oscillator stability across seasons.
推荐
Test and Measurement Instrumentation
Bench instruments, data loggers, and handheld meters used the ATmega103 for its combination of large program memory and integrated 10-bit ADC. The single-cycle RISC core executes measurement sequencing and linearization code deterministically at 6 MHz, while the external memory interface expands SRAM for long capture buffers beyond the internal 4 KB. The ADC's 8 input channels allow multi-sensor front ends (voltage, current shunts, thermistors) without external multiplexers, and the 10-bit resolution suits 3.5-digit-class display accuracy. EEPROM stores factory calibration constants that survive firmware field updates, and the UART supports calibration-period communication with PC software via RS-232 level shifters.
推荐
Embedded Legacy Maintenance and Repair
A primary ongoing role of the ATMEGA103-6AI today is repair and refurbishment of discontinued equipment where board redesign is not economical. Because the device supports in-system programming via SPI, replacement MCUs can be flashed with extracted firmware directly on the customer board, avoiding socket adapters. Technicians sourcing spares should verify date codes and authenticity given broker-market risks with EOL AVR parts. Where the exact 6AI part is unavailable, the ATMEGA128-16AU programmed with ATmega103 compatibility mode (M103C fuse set) restores operation with identical I/O placement, minimizing repair turnaround for legacy CNC controls, medical-service equipment, and utility metering hardware still in the field.
推荐
Automotive Off-Highway Retrofit Modules
Although not automotive-qualified by modern AEC-Q100 standards, the industrial -40C to +85C ATmega103 grade was used in off-highway retrofit controllers, agricultural guidance add-ons, and marine instrumentation where ambient extremes occur. The 5V logic interfaces cleanly with legacy sensor outputs (variable reluctance conditioners, potentiometer throttles) through the 10-bit ADC, and Timer/PWM outputs drive gauges and idle-control actuators. The large Flash allowed table-based lookup curves for engine mapping. Modern retrofit vendors maintaining these product lines migrate to the ATmega128 family to regain sourcing while preserving board layouts; the faster 16 MHz clock also adds headroom for CAN gateway code via software bit-banging or external controllers.
推荐
RF and Telemetry Data Loggers
Early telemetry nodes and RF data loggers paired the ATmega103 with external radio modems over its UART, using the 128 KB Flash for buffers, compression routines, and schedule-based wake logic. The MCU's low-power CMOS process allowed sleep modes that stretched battery life in remote monitoring stations, waking on UART activity or timer overflow to sample the 10-bit ADC and append timestamped records to external memory via SPI. Its 5V rail matched common lead-acid battery systems with simple linear regulation. Current maintainers of such networks typically replace failed units with ATMEGA128-16AU drop-ins or redesign around modern AVR parts with integrated lower-voltage operation and hardware USARTs with higher baud-rate accuracy.
推荐
推荐产品汇总
工程参考数据： ATMEGA103-6AI ——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 | ATMEGA128-16AU | ATMEGA128-16AUR | ATMEGA1281-16AU | ATMEGA103L-4AI |
|---|---|---|---|---|---|
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same |
| Brand | Microchip Technology (Atmel heritage) | Microchip Technology (Atmel heritage) | Microchip Technology (Atmel heritage) | Microchip Technology (Atmel heritage) | Microchip Technology (Atmel heritage) |
| Max Clock Frequency | 6 MHz | 16 MHz | 16 MHz | 16 MHz | 4 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| SRAM | 4 KB | 4 KB | 4 KB | 8 KB | 4 KB |
| Supply Voltage | 5 V | 4.5 V to 5.5 V (16 MHz grade) | 4.5 V to 5.5 V (16 MHz grade) | 4.5 V to 5.5 V (16 MHz grade) | Low-voltage L grade |
| ATmega103 Compatibility Mode | Native | Yes (M103C fuse) | Yes (M103C fuse) | No (software migration required) | Native |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
关键差异点
- Largest Flash of its generation (128 KB in-system programmable) （对比 ATMEGA103L-4AI)
- Industrial temperature grade for harsh environments （对比 ATMEGA103-6AC)
- Established drop-in migration path （对比 ATMEGA128-16AU)
设计说明
Treat the ATMEGA103-6AI as an EOL part: production has ceased and open-market inventory may include remarked or recycled units. When procuring for legacy repair, require date-code traceability and, where possible, verify the SPI in-system programming signature before trusting a sourced unit. If firmware was never archived, extract it from a working unit via the SPI ISP interface before replacing any MCU, because the EEPROM also holds calibration and network data that a blank replacement will not contain.
The 6 MHz speed grade is specified for 5V operation; derating occurs if supply voltage sags below the specified 5V window, and oscillator margin failures typically appear first at cold temperature. Provide a local 100 nF decoupling capacitor on VCC and AVCC pins, and power AVCC through an RC filter to keep ADC noise low on mixed-signal legacy boards. Verify brown-out detector configuration, since early AVR brown-out behavior differs from modern parts and reset stability at 5V cold-start is a common field-failure source in legacy repairs.
When substituting the pin-compatible ATmega128 for an ATmega103 footprint, review the PCB for the M103C fuse implications: in ATmega103 compatibility mode some alternate I/O functions differ from native ATmega128 mapping. Place the 64-TQFP thermal pad area per original layout (the 14x14 mm TQFP dissipates little power at 6 MHz, so no heatsinking is required), keep the SPI ISP header routed to the programming connector for in-field firmware updates, and reserve external memory bus traces with proper series termination if 4 KB internal SRAM was previously expanded off-chip.
合规信息
Legacy Atmel part predating RoHS-era suffix markings; compliance must be verified per date code and Microchip certificate of conformance. Not AEC-Q100 qualified.