ATMEGA32L-8AJ - 8-bit AVR MCU, 32KB Flash, 8MHz, 44-TQFP | Microchip
部品番号: ATMEGA32L-8AJ ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.75 | $67.50 |
| 100 | $6 | $600.00 |
| 500 | $5.4 | $2,700.00 |
| 1,000 | $4.8 | $4,800.00 |
ATMEGA32L-8AJ 概要
An 8-bit AVR microcontroller is a RISC-based single-chip computer built on the enhanced AVR core architecture. The "AVR" line belongs to the broader microcontrollers (MCU) category within the integrated circuits hierarchy, sitting below application-specific microcontrollers but above simple 4/8-bit controllers in capability. AVR cores execute most instructions in a single clock cycle, delivering throughput close to 1 MIPS per MHz.
Key features of the ATMEGA32L-8AJ include 32 programmable I/O lines, an 8-channel 10-bit ADC, two 8-bit timer/counters plus one 16-bit timer/counter, a JTAG interface for on-chip debug, and serial peripherals including USART, SPI, and TWI (I2C-compatible). The device supports up to 8 MIPS throughput at 8MHz and includes hardware multipliers, watchdog timer, and multiple power-saving modes (Idle, Power-save, Power-down, Standby).
Architecturally, the ATmega32L uses a Harvard-style modified RISC core with 32x8-bit general-purpose working registers directly connected to the ALU. This register file enables single-cycle ALU operations, contributing to the device's code-density and deterministic execution-time advantages over accumulator-based CISC 8-bit cores. The integrated oscillator, brown-out detector, and on-chip debug (via JTAG or debugWIRE) simplify BOM and tooling.
Typical applications include industrial control systems, sensor hubs, low-power battery-operated nodes, HVAC controllers, white goods, and human-machine interface (HMI) front-ends. The wide 2.7V-5.5V supply range makes it suitable for both 3.3V and 5V logic designs, and the 32KB Flash tier is sufficient for TCP/IP, USB (via software stack), or graphical LCD user interfaces.
When designing with this device, remember that the "L" variant tops out at 8MHz; for 16 MHz operation the non-L ATmega32-16AJ is required. Decoupling must include a 100nF ceramic capacitor per VCC pin pair, and the AREF pin needs a 10nF capacitor when the ADC is used. Programming is supported via ISP, JTAG, or debugWIRE.
This page consolidates distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet summary - giving engineers and buyers a one-stop reference for evaluating, sourcing, and designing around the ATMEGA32L-8AJ.
ドロップイン代替品: ATMEGA32L-8AJ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATMEGA32L-8AJ （同一形状・フットプリント） — 相違点: ADC, Package, Core Architecture, Maximum Clock Frequency, Operating Temperature.
クイック比較ツール — 並列比較する代替部品を選択:
ATMEGA32L-8AI
✅ ドロップイン✓ 在庫あり
$5.62 / 個
データシートを見る →ATMEGA32A-AU
✅ ドロップイン ⚠️ 仕様未検証✓ 在庫あり
$2.95 / 個
データシートを見る →ATMEGA32L-8AC
✅ ドロップイン✓ 在庫あり
$5.85 / 個
データシートを見る →ATMEGA32L-8AJ 最大定格＆電気的特性
| Core Architecture | AVR 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| 最大クロック周波数 | 8 MHz |
| Operating Voltage (L variant) | 2.7 V to 5.5 V |
| Throughput | Up to 8 MIPS |
| Programmable I/O Lines | 32 |
| ADC | 8-channel, 10-bit |
| Timers | 2x 8-bit + 1x 16-bit |
| Serial Interfaces | USART, SPI, TWI (I2C) |
| On-chip Debug | JTAG / debugWIRE |
| パッケージ | 44-pin TQFP (10x10 mm) |
| Power Consumption (Active, 1MHz, 3V, 25C) | 1.1 mA |
| Power Consumption (Idle Mode) | 0.35 mA |
| Power Consumption (Power-down) | < 1 uA |
| 実装タイプ | Surface Mount |
ATMEGA32L-8AJ ピン構成
| ピン 1 | VCC — Digital supply voltage |
| ピン 2 | GND — Ground |
| ピン 3 | XTAL2 — Crystal oscillator output |
| ピン 4 | XTAL1 — Crystal oscillator input |
| ピン 5 | PD0/RXD — Port D bit 0 / USART RX |
| ピン 6 | PD1/TXD — Port D bit 1 / USART TX |
| ピン 7 | PD2/INT0 — Port D bit 2 / External Interrupt 0 |
| ピン 8 | PD3/INT1 — Port D bit 3 / External Interrupt 1 |
| ピン 9 | PD4/OC1B — Port D bit 4 / Timer1 Compare B |
| ピン 10 | PD5/OC1A — Port D bit 5 / Timer1 Compare A |
| ピン 11 | PD6/ICP1 — Port D bit 6 / Timer1 Input Capture |
| ピン 12 | PD7/OC2 — Port D bit 7 / Timer2 Compare |
| ピン 13 | PB0/T0 — Port B bit 0 / Timer0 Clock |
| ピン 14 | PB1/T1 — Port B bit 1 / Timer1 Clock |
| ピン 15 | PB2/AIN0 — Port B bit 2 / Analog Comparator + |
| ピン 16 | PB3/AIN1 — Port B bit 3 / Analog Comparator - |
| ピン 17 | PB4/SS — Port B bit 4 / SPI Slave Select |
| ピン 18 | PB5/MOSI — Port B bit 5 / SPI MOSI |
| ピン 19 | PB6/MISO — Port B bit 6 / SPI MISO |
| ピン 20 | PB7/SCK — Port B bit 7 / SPI Clock |
| ピン 21 | RESET — Reset input (active low) |
| ピン 22 | VCC — Digital supply voltage |
| ピン 23 | GND — Ground |
| ピン 24 | XTAL2 — Crystal oscillator output (alternate) |
| ピン 25 | XTAL1 — Crystal oscillator input (alternate) |
| ピン 26 | PC0/SCL — Port C bit 0 / TWI Clock |
| ピン 27 | PC1/SDA — Port C bit 1 / TWI Data |
| ピン 28 | PC2/TCK — Port C bit 2 / JTAG TCK |
| ピン 29 | PC3/TMS — Port C bit 3 / JTAG TMS |
| ピン 30 | PC4/TDO — Port C bit 4 / JTAG TDO |
| ピン 31 | PC5/TDI — Port C bit 5 / JTAG TDI |
| ピン 32 | PC6/TOSC1 — Port C bit 6 / Timer Oscillator 1 |
| ピン 33 | PC7/TOSC2 — Port C bit 7 / Timer Oscillator 2 |
| ピン 34 | AVCC — Analog supply voltage |
| ピン 35 | AGND — Analog ground |
| ピン 36 | AREF — ADC reference voltage |
| ピン 37 | PA0/ADC0 — Port A bit 0 / ADC Channel 0 |
| ピン 38 | PA1/ADC1 — Port A bit 1 / ADC Channel 1 |
| ピン 39 | PA2/ADC2 — Port A bit 2 / ADC Channel 2 |
| ピン 40 | PA3/ADC3 — Port A bit 3 / ADC Channel 3 |
| ピン 41 | PA4/ADC4 — Port A bit 4 / ADC Channel 4 |
| ピン 42 | PA5/ADC5 — Port A bit 5 / ADC Channel 5 |
| ピン 43 | PA6/ADC6 — Port A bit 6 / ADC Channel 6 |
| ピン 44 | PA7/ADC7 — Port A bit 7 / ADC Channel 7 |
主な用途
ATMEGA32L-8AJ の用途: 6 件s: Industrial Sensor Hubs, Battery-Powered IoT Sensor Nodes, HVAC and White Goods Controllers, HMI Front-Ends with LCD/Keypad, Automotive Body and Comfort Modules, Educational and Hobbyist Development.
Industrial Sensor Hubs
The ATMEGA32L-8AJ fits industrial sensor hubs thanks to its 8-channel 10-bit ADC, 32 programmable I/O lines, and 2.7V-5.5V supply tolerance. At 8 MHz, the MCU can poll multiple analog sensors (temperature, pressure, flow) at 10 kHz aggregate throughput while running light-weight filtering in firmware. The 32 KB Flash tier is ample for Modbus RTU slave stacks, calibration tables, and bootloaders. Compared with the non-L ATmega32, the L variant's lower minimum voltage lets the same design run on 24V industrial rails stepped down with a simple LDO. JTAG/debugWIRE on-chip debug shortens field firmware updates.
おすすめ
Battery-Powered IoT Sensor Nodes
The ATMEGA32L-8AJ's < 1 uA power-down current and 0.35 mA idle current at 1 MHz/3V make it ideal for coin-cell or 2xAA-powered wireless sensor nodes. Combined with an external sub-GHz radio (e.g., RFM69 or LoRa module), the MCU can sleep most of the time and wake only to take measurements and transmit. The 32 KB Flash tier accommodates wireless protocol stacks (e.g., simple RFM69 driver + sensor libraries) without external memory. The wide 2.7V-5.5V supply range supports direct connection to Li-coin or 2xAA chemistries. Compared with Cortex-M0+ alternatives, the AVR's deterministic interrupt latency simplifies power-budget scheduling.
おすすめ
HVAC and White Goods Controllers
The ATMEGA32L-8AJ's combination of 8-channel 10-bit ADC for thermistor/RTD sensing, PWM-capable timers for motor and valve control, and TWI/I2C for sensor expansion bus (e.g., external temp/humidity sensors) makes it a natural fit for HVAC and white-goods control boards. The 32 KB Flash holds application logic plus factory calibration data stored in the 1 KB EEPROM. Its 5V-tolerant I/O simplifies interfacing with legacy triac-driver and relay-driver stages common in appliances. Compared with Cortex-M alternatives, the AVR's simpler toolchain and faster interrupt response reduce firmware complexity for hard real-time control loops.
おすすめ
HMI Front-Ends with LCD/Keypad
The ATMEGA32L-8AJ's 32 programmable I/O lines easily accommodate a 4x4 keypad matrix, character LCD (HD44780) or graphical LCD interface, status LEDs, and a rotary encoder input. The 32 KB Flash tier is sufficient for menu state machines, multi-language strings, and basic bitmap rendering. The hardware TWI/I2C and SPI peripherals support external EEPROM for storing user preferences. Compared with smaller-pin-count ATmega variants, the ATmega32L's extra I/O eliminates the need for an I/O expander chip in moderately complex HMIs. The JTAG interface simplifies debugging of button-debounce and rotary-encoder logic.
おすすめ
Automotive Body and Comfort Modules
The ATMEGA32L-8AJ can serve non-safety automotive body and comfort applications such as seat controllers, mirror adjusters, and interior lighting. Its 32 KB Flash tier fits CAN/LIN slave stacks and diagnostic UDS handlers. The 8-channel ADC reads multiple switch and potentiometer inputs for trim position sensing. The 2.7V-5.5V supply is compatible with 12V automotive rails after a 5V LDO. Note that this part is NOT AEC-Q100 qualified; for safety-critical applications the AEC-Q100 ATmega32 family variants or external ASIL-qualified MCUs are required. Compared with newer automotive Cortex-M parts, the AVR is acceptable for legacy and non-safety subsystems.
おすすめ
Educational and Hobbyist Development
The ATMEGA32L-8AJ remains a popular educational and hobbyist microcontroller thanks to the free AVR Studio / Microchip Studio toolchain, low-cost programmers (e.g., AVRISP mkII, USBasp), and rich community firmware library (AVRLib). The 44-TQFP package is breadboard-friendly with TQFP-to-DIP breakout adapters, and the 32 KB Flash tier is sufficient for student projects involving PWM, ADC, I2C peripherals, and basic RTOS kernels. The hardware JTAG/debugWIRE supports single-step debugging in labs. Compared with the cheaper ATmega328P used in Arduino Uno, the ATmega32L provides more I/O, more Flash, and a richer peripheral set for advanced coursework.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATMEGA32L-8AJ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
Choose ATMEGA32L-8AI instead if your design operates in industrial temperature (-40C to +85C) environments - same die, same package, just wider temp grade. Choose ATMEGA32A-AU if you want the modern ATmega32A die revision with up to 20 MHz operation and improved peripherals, but verify your PCB supports the 44-pin TQFP variant (note: ATmega32A-AU is QFN/MLF, not TQFP).
For drop-in 16 MHz operation above 4.5V supply, the non-L ATmega32-16AJ is required - it shares the same 44-TQFP pinout but cannot run below 4.5V. For lower power and Arduino Uno compatibility, choose ATmega328P-PU in DIP-28 form factor.
代替品との比較
| パラメータ | この製品 | ATMEGA32L-8AI | ATMEGA32A-AU | ATMEGA32L-8AC |
|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP - same | 44-TQFP - same | 44-TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | AVR 8-bit | AVR 8-bit | AVR 8-bit | AVR 8-bit |
| Max Clock Frequency | 8 MHz | 8 MHz | 20 MHz | 8 MHz |
| Operating Voltage | 2.7 V - 5.5 V | 2.7 V - 5.5 V | 2.7 V - 5.5 V | 2.7 V - 5.5 V |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB |
| I/O Lines | 32 | 32 | 32 | 32 |
| ADC | 8-ch, 10-bit | 8-ch, 10-bit | 8-ch, 10-bit | 8-ch, 10-bit |
| Temperature Grade | Commercial | Industrial | Industrial | Commercial |
| Unit Price (qty 1, USD) | 7.50 | 8.20 | 6.40 | 7.80 |
主な差別化要因
- Wide 2.7V-5.5V supply range with 8 MHz operation （vs ATmega32-16AJ)
- 32 KB self-programmable Flash with 1 KB EEPROM （vs ATmega328P-PU)
- 32 programmable I/O lines across four ports （vs ATmega328P-PU)
設計ノート
Estimated: At 8 MHz active mode and 5V supply, the ATMEGA32L-8AJ draws approximately 12-15 mA per the ATmega32/L datasheet. Decoupling must include a 100 nF ceramic capacitor on each VCC pin pair (pins 1/22 for digital VCC, pin 34 for AVCC), plus a 10 uF bulk capacitor at the regulator output. The AREF pin requires a 100 nF capacitor when the ADC is in use; a ferrite bead between AVCC and VCC is recommended to isolate analog supply noise.
Do not exceed 8 MHz on the L variant - operating above this at low voltage can cause flash corruption and ADC inaccuracy. The ATMEGA32L-8AJ shares its pinout with the ATmega32-16AJ, but the non-L variant needs 4.5V minimum supply. Always check the speed grade suffix ("-8A" = 8 MHz L variant, "-16" = 16 MHz non-L) before PCB bring-up. Programming via JTAG requires the four JTAG pins (PC2-PC5) to be available; routing these to test points is recommended for field debug.
Place the 100 nF decoupling capacitor within 3 mm of each VCC pin pair. The crystal traces (XTAL1/XTAL2) should be short, symmetrical, and guarded by ground pour to reduce EMI susceptibility. If the ADC is used at > 8 ksps, place a small RC filter (10 ohm + 100 nF) on each analog input. Route JTAG signals (TCK, TMS, TDO, TDI) in a bus to a 2x5 0.05" header for production programming and debug.
Estimated: At 8 MHz and 5V, the ATMEGA32L-8AJ dissipates roughly 60-75 mW. The 44-TQFP package has a theta_JA of approximately 50 C/W, yielding a 3-4 C temperature rise above ambient. No external heatsink is required for typical commercial and industrial temperature operation. For extended-temperature designs, ensure copper pour area under the exposed pad (TQFP center pad) connects to GND to improve thermal spreading.
コンプライアンス情報
Compliance data not explicitly stated in the verified web results. ATMEGA32L-8AJ is NOT AEC-Q100 qualified - for safety-critical automotive applications choose ATmega32 AEC-Q100 variants or external ASIL-qualified MCUs.