ATMEGA8L-8MJ - 8MHz AVR MCU, 8KB Flash, 32-VQFN | Microchip
料号： ATMEGA8L-8MJ ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
ATMEGA8L-8MJ 概述
A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripherals into one chip, forming the lowest tier of the embedded computing hierarchy (MCU -> embedded processor -> system-on-chip). The ATmega8 family is part of the AVR line, a modified Harvard-architecture 8-bit RISC family originally developed by Atmel, now owned by Microchip Technology after their 2016 acquisition.
The ATMEGA8L-8MJ executes 130 powerful instructions, most in a single clock cycle, achieving close to 1 MIPS per MHz. The L suffix denotes the low-voltage grade (operation below the standard 4.5V floor of the ATmega8), and the internal oscillator option removes the need for an external crystal in cost- or space-sensitive designs. On-chip peripherals include brown-out detection and reset, power-on reset, PWM outputs, and a watchdog timer.
Architecturally, the device provides 32 general-purpose working registers directly connected to the ALU, three flexible Timer/Counters with compare modes, a byte-oriented Two-wire Serial Interface (I2C/TWI), a serial programmable USART, and SPI. A 6-channel ADC and Read-While-Write FLASH programming round out the feature set, per the Atmel ATmega8/L datasheet (Atmel-2486).
Typical applications include industrial control nodes, sensor and instrumentation boards, hobby and educational embedded systems, and legacy replacement designs where a compact 5x5 mm QFN footprint and 3.3V-friendly operation are required.
Design consideration: because this part is obsolete, new designs should target the ATmega8A family or pin-compatible successors, and existing BOMs should secure stock or qualify a drop-in alternative such as ATMEGA8L-8MU before layout freeze.
This page synthesizes distributor cross-reference data, packaging details, drop-in alternative analysis, and practical sourcing guidance not found in the manufacturer datasheet.
直接替换替代料： ATMEGA8L-8MJ ——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： ATMEGA8L-8MJ （相同外形与封装尺寸） ——差异在于 EEPROM Size, Oscillator Type, Package, Program Memory Size, RAM Size.
快速对比工具——选择替代料号进行并排对比：
ATMEGA8L-8MU
✅ 直接替换📋 参考替代料（不在目录中）
ATMEGA8A-MUR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.7 / 个
查看数据手册 →ATMEGA8-16MJ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.98 / 个
查看数据手册 →ATMEGA8L-8MJ 最大额定值与电气特性
| Core Processor | AVR |
| Core Size | 8-Bit |
| Speed | 8 MHz |
| Program Memory Size | 8KB (4K x 16) |
| Program Memory Type | FLASH |
| EEPROM Size | 512 x 8 |
| RAM Size | 1K x 8 |
| Number of I/O | 23 |
| Connectivity | I2C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Oscillator Type | Internal |
| 封装 / 外壳 | 32-VFQFN Exposed Pad (5x5 mm) |
| 安装类型 | Surface Mount |
| Packaging | Tray |
| Part Status | Obsolete |
| Series | AVR ATmega |
ATMEGA8L-8MJ 32-vfqfn exposed pad (5x5 mm) 引脚配置指南
ATMEGA8L-8MJ（32-vfqfn exposed pad (5x5 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： ATMEGA8L-8MJ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATMEGA8L-8MJ 适用于 6 应用s: Industrial Control Nodes, Sensor and Instrumentation Boards, Legacy Replacement and Repair, Embedded Education and Prototyping, Motor Control and PWM Loads, Communication Interface Bridges.
Industrial Control Nodes
The ATMEGA8L-8MJ fits industrial control and monitoring nodes where a compact 5x5 mm 32-VFQFN footprint, 23 GPIO lines, and on-chip brown-out detection plus watchdog timer are required. Its 8KB ISP FLASH with Read-While-Write supports field firmware updates over the TWI (I2C) or SPI bus, while the internal oscillator removes the cost and layout impact of an external crystal in noise-tolerant control loops. PWM peripherals directly drive actuators and dimming loads without additional companion ICs. Because the part is obsolete, use it for sustaining existing installations only; for new industrial designs, Microchip's ATmega8A or ATmega328PB families provide the same peripheral set with active lifecycle status and better availability.
推荐
Sensor and Instrumentation Boards
Sensor acquisition boards benefit from the ATMEGA8L-8MJ's 6-channel ADC, TWI and SPI buses for connecting external converters, and 1KB SRAM for buffering samples. The low-voltage L-grade operation suits 3.3V battery-powered instruments, and the internal oscillator option keeps the BOM minimal in cost-sensitive designs. The USART provides a simple telemetry link to host systems, while brown-out reset guarantees deterministic recovery during supply dips. In such designs, the exposed ground pad of the QFN package also provides a low-inductance ground reference that benefits ADC noise performance. For new instrumentation projects, select ATMEGA8A-MU, which retains the footprint while adding improved analog characteristics documented in the ATmega8A datasheet.
推荐
Legacy Replacement and Repair
Repair and sustaining engineering for legacy ATmega8-based equipment is the primary remaining use case for the ATMEGA8L-8MJ. Because the ATmega8 die has been in the field for two decades, a large installed base of industrial, automotive aftermarket, and consumer boards still depends on it. ATMEGA8L-8MJ, or its identical drop-in ATMEGA8L-8MU, restores function with zero firmware or layout changes. When only a 5V supply exists, ATMEGA8-16MJ is also pin-compatible. Buyers should verify date codes and authenticity through reputable broker channels since obsolete AVRs are a known counterfeit target, and Octopart currently lists three distributor sources for price comparison.
推荐
Embedded Education and Prototyping
The AVR ATmega8 architecture is a staple of embedded-systems education: 130 mostly single-cycle RISC instructions, 32 working registers, and a well-documented register map make it an excellent teaching platform. The 32-VFQFN package, however, is harder to hand-solder than the DIP variant, so educational use of the -8MJ specifically targets pre-assembled modules and SMD assembly labs. Its I2C, SPI, and UART peripherals allow students to exercise all common embedded buses on one chip, and the ISP FLASH supports quick reprogramming without a socket. For new course material, base the curriculum on the ATmega8A to guarantee parts availability while keeping all existing lab code compatible.
推荐
Motor Control and PWM Loads
The ATMEGA8L-8MJ's three Timer/Counters with compare modes generate PWM outputs for small motor drives, LED dimming, and heater control without external PWM ICs. Timer1 provides a 16-bit PWM channel suitable for fine-grained duty control, while the watchdog timer adds a safety layer for stalled-loop recovery in actuator applications. The 8MHz internal clock is sufficient for low-speed PWM work, and the 23 I/O lines leave headroom for limit switches and encoder inputs. Thermal design is simple at MCU power levels, but ensure the exposed QFN pad is grounded to sink die heat. For new motor-control nodes, the active ATMEGA8A-MU provides the same timers with a fully supported lifecycle.
推荐
Communication Interface Bridges
With hardware I2C (Two-wire Serial Interface), SPI, and a USART on one chip, the ATMEGA8L-8MJ works well as a protocol bridge or gateway between subsystems - for example, translating UART telemetry from a modem to an I2C sensor bus, or buffering SPI flash data. The 1KB SRAM provides adequate packet buffering for low-speed links, and the byte-oriented TWI supports multi-master configurations per the Atmel-2486 datasheet. The 8MHz core executes roughly 1 MIPS per MHz, enough for software framing and checksums at modest data rates. New bridge designs should start on the ATMEGA88PA or ATmega328 family for larger RAM and PCINT flexibility, keeping the same MLF32 mechanical footprint where needed.
推荐
推荐产品汇总
工程参考数据： ATMEGA8L-8MJ ——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 | ATMEGA8L-8MU | ATMEGA8A-MU | ATMEGA8-16MJ |
|---|---|---|---|---|
| Package | 32-VFQFN Exposed Pad (5x5 mm) | 32-VFQFN Exposed Pad (5x5 mm) - same | 32-VFQFN Exposed Pad (5x5 mm) - same | 32-VFQFN Exposed Pad (5x5 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Lifecycle Status | Obsolete | Obsolete | Active | Obsolete |
| Max Speed | 8 MHz | 8 MHz | 8 MHz (L grade) | 16 MHz |
| Program Memory | 8KB (4K x 16) FLASH | 8KB (4K x 16) FLASH | 8KB (4K x 16) FLASH | 8KB (4K x 16) FLASH |
| SRAM | 1KB | 1KB | 1KB | 1KB |
| Number of I/O | 23 | 23 | 23 | 23 |
| Supply Voltage Class | Low-voltage L grade (3.3V-capable) | Low-voltage L grade (3.3V-capable) | Wide-range 8A grade (3.3V-capable) | Standard grade (5V systems) |
关键差异点
- Identical drop-in availability via ATMEGA8L-8MU （对比 ATMEGA8L-8MU)
- Active lifecycle with ATMEGA8A-MU （对比 ATMEGA8A-MU)
- 3.3V-capable L grade versus 5V-only standard grade （对比 ATMEGA8-16MJ)
设计说明
The 32-VFQFN exposed pad requires a centered ground land pattern with an array of thermal vias to the ground plane. The exposed pad is the primary ground connection and thermal path for the die; an ungrounded or poorly wetted pad is a leading cause of intermittent resets and ADC noise on MLF-package AVRs. Follow the MLF land-pattern recommendations in the Atmel-2486 ATmega8/L datasheet and inspect the pad joint with X-ray for critical builds.
Because this part is obsolete, every new purchase carries counterfeit and date-code risk: insist on certificates of conformance, buy from franchised distributors where stock remains, and plan a last-time-buy sized to your remaining product lifetime. Qualify ATMEGA8A-MU as the long-term drop-in now rather than after broker stock disappears - the ATmega8A is documented by Microchip as the successor device in the same 32-VQFN footprint.
As an L-grade (low-voltage) device, the ATMEGA8L-8MJ targets low-voltage rails, so verify your supply class before substituting: the standard-grade ATMEGA8-16MJ is not rated for the same low-voltage operation. Decouple VCC and AVCC with 100nF ceramics placed within a few millimeters of the pins, and tie AVCC to VCC through a low-pass filter if ADC accuracy matters. Enable brown-out detection via fuse settings to guarantee deterministic behavior during supply transients.
Keep the crystal (if used) within a few millimeters of the XTAL1/XTAL2 pins over a solid ground plane; the internal oscillator option can be fused instead to free two I/O-adjacent pins. Route the TWI (I2C) bus with pull-ups sized for bus capacitance and keep SPI clock lines away from the ADC reference routing. For ISP programming, reserve header access to MOSI, MISO, SCK, and RESET during layout so field firmware updates remain possible.
合规信息
Compliance status not explicitly stated in verified web data for this specific MPN. One third-party comparison describes the ATmega8L QFN family as GREEN, but no manufacturer certificate was retrieved; confirm per date code with the supplier.
