ATMEGA32L-8MI - 8MHz 32KB Flash AVR MCU | Microchip 44-VQFN
MPN: ATMEGA32L-8MI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.5 | $9.50 |
| 10 | $8.55 | $85.50 |
| 100 | $7.6 | $760.00 |
| 500 | $6.84 | $3,420.00 |
| 1,000 | $6.08 | $6,080.00 |
ATMEGA32L-8MI Overview
An AVR microcontroller is an 8-bit RISC processor family that executes most instructions in a single clock cycle, making it well suited for deterministic, low-latency embedded control. Within the broader taxonomy, ATMEGA32L-8MI belongs to the AVR > megaAVR > 8-bit microcontroller > embedded MCU hierarchy, sharing its core with the wider ATmega family while remaining in the voltage/power-optimized "L" sub-line.
Key features include 32 programmable I/O lines, two 8-bit timers plus one 16-bit timer with separate prescaler and compare mode, a USART, an SPI serial interface, an I2C-compatible TWI bus, an 8-channel 10-bit successive-approximation ADC, internal calibrated RC oscillator, and six software-selectable power-saving modes. Power consumption is 1.1 mA active at 1 MHz / 3V / 25°C, dropping to 0.35 mA in Idle and below 1 µA in Power-down with RTC active.
Architecturally, the device combines an enhanced Harvard-style RISC core with 131 powerful instructions, a 32 x 8 general-purpose working register file, and on-chip debug support via JTAG/OCD. The result is a mature, widely-supported platform with a free toolchain (AVR-GCC, Atmel Studio / Microchip Studio) that enables rapid firmware development for industrial and consumer embedded designs.
Typical applications include industrial control nodes, sensor data loggers, low-power battery-powered instruments, motor and lighting controllers, and JTAG-debugged consumer appliances where deterministic 8-bit performance and low quiescent current both matter. The wide 2.7V–5.5V supply window makes it usable from a single Li-ion cell or a regulated 5V rail.
When designing with this MCU, place a 0.1 µF decoupling capacitor close to each VCC pin and provide a 10 µF bulk capacitor on the AVCC rail to keep ADC measurements clean. The internal RC oscillator is factory-calibrated but for UART or USB-grade timing, add an external crystal on XTAL1/XTAL2 matched to the system load capacitance specified in the manufacturer datasheet.
This page synthesizes distributor pricing, drop-in VQFN-44 alternatives from the same ATmega family, and practical design notes beyond the manufacturer datasheet to accelerate BOM selection.
Drop-in alternatives for ATMEGA32L-8MI — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATMEGA32L-8MI (same form factor and footprint) — differing in Package, ADC, Instruction Set, Mounting Type, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATMEGA32L-8MU
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →ATMEGA32L-8AI
✅ Drop-In✓ In Stock
$5.62 / Unit
View Datasheet →ATMEGA329V-8MI
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →ATMEGA325V-8MI
✅ Drop-In ⚠️ 参数待验证✓ In Stock
Contact for price
View Datasheet →ATMEGA32C1-15AZ
✅ Drop-In✓ In Stock
$2.95 / Unit
View Datasheet →ATMEGA32L-8MI Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum Clock Frequency | 8 MHz |
| Operating Voltage Range (L) | 2.7 V to 5.5 V |
| Instruction Set | 131 powerful instructions, mostly single-cycle |
| Throughput | Up to 8 MIPS at 8 MHz |
| Programmable I/O Lines | 32 |
| ADC | 8-channel, 10-bit successive approximation |
| Timers/Counters | Two 8-bit, one 16-bit with separate prescaler |
| Serial Interfaces | USART, SPI, I2C-compatible TWI |
| On-chip Debug | JTAG (OCD) |
| Package | 44-pin VQFN (7x7 mm) |
| Mounting Type | Surface Mount |
| Active Current @1 MHz, 3V, 25C | 1.1 mA |
| Idle Current @1 MHz, 3V, 25C | 0.35 mA |
| Power-down Current | < 1 µA |
| Operating Temperature (Industrial) | -40C to +85C |
| RoHS Status | Compliant |
ATMEGA32L-8MI Pin Configuration
| Pin 1 | VCC — Digital supply voltage |
| Pin 2 | XTAL2 — Crystal oscillator output |
| Pin 3 | XTAL1 — Crystal oscillator input |
| Pin 4 | RESET — Reset input (active low) |
| Pin 5 | PD0 (RXD) — PORTD bit 0 / USART RXD |
| Pin 6 | PD1 (TXD) — PORTD bit 1 / USART TXD |
| Pin 7 | PD2 (INT0) — PORTD bit 2 / External interrupt 0 |
| Pin 8 | PD3 (INT1) — PORTD bit 3 / External interrupt 1 |
| Pin 9 | PD4 (OC1B) — PORTD bit 4 / Timer1 compare B |
| Pin 10 | VCC — Digital supply voltage |
| Pin 11 | GND — Ground |
| Pin 12 | PD5 (OC1A) — PORTD bit 5 / Timer1 compare A |
| Pin 13 | PD6 (ICP) — PORTD bit 6 / Timer1 input capture |
| Pin 14 | PD7 (OC2) — PORTD bit 7 / Timer2 compare |
| Pin 15 | PB0 (T0) — PORTB bit 0 / Timer0 clock |
| Pin 16 | PB1 (T1) — PORTB bit 1 / Timer1 clock |
| Pin 17 | PB2 (AIN0) — PORTB bit 2 / Analog comparator + |
| Pin 18 | PB3 (AIN1) — PORTB bit 3 / Analog comparator - |
| Pin 19 | PB4 (SS) — PORTB bit 4 / SPI slave select |
| Pin 20 | PB5 (MOSI) — PORTB bit 5 / SPI master out |
| Pin 21 | PB6 (MISO) — PORTB bit 6 / SPI master in |
| Pin 22 | PB7 (SCK) — PORTB bit 7 / SPI clock |
| Pin 23 | VCC — Digital supply voltage |
| Pin 24 | GND — Ground |
| Pin 25 | PC0 (SCL) — PORTC bit 0 / TWI clock |
| Pin 26 | PC1 (SDA) — PORTC bit 1 / TWI data |
| Pin 27 | PC2 (TCK) — PORTC bit 2 / JTAG TCK |
| Pin 28 | PC3 (TMS) — PORTC bit 3 / JTAG TMS |
| Pin 29 | PC4 (TDO) — PORTC bit 4 / JTAG TDO |
| Pin 30 | PC5 (TDI) — PORTC bit 5 / JTAG TDI |
| Pin 31 | PC6 (TOSC1) — PORTC bit 6 / Timer0 oscillator |
| Pin 32 | PC7 (TOSC2) — PORTC bit 7 / Timer0 oscillator |
| Pin 33 | AVCC — Analog supply voltage |
| Pin 34 | AREF — ADC reference voltage |
| Pin 35 | GND — Ground |
| Pin 36 | PA7 (ADC7) — PORTA bit 7 / ADC channel 7 |
| Pin 37 | PA6 (ADC6) — PORTA bit 6 / ADC channel 6 |
| Pin 38 | PA5 (ADC5) — PORTA bit 5 / ADC channel 5 |
| Pin 39 | PA4 (ADC4) — PORTA bit 4 / ADC channel 4 |
| Pin 40 | PA3 (ADC3) — PORTA bit 3 / ADC channel 3 |
| Pin 41 | PA2 (ADC2) — PORTA bit 2 / ADC channel 2 |
| Pin 42 | PA1 (ADC1) — PORTA bit 1 / ADC channel 1 |
| Pin 43 | PA0 (ADC0) — PORTA bit 0 / ADC channel 0 |
| Pin 44 | VCC — Digital supply voltage |
Typical Applications
ATMEGA32L-8MI is suitable for 6 applications: Industrial Sensor Data Logger, Battery-Powered Metering Instrument, HVAC Building Automation Node, Lighting and Motor Control MCU, Consumer Appliance Control Board, Automotive Body and Sensor Module.
Industrial Sensor Data Logger
The ATMEGA32L-8MI is well matched to industrial sensor data loggers because its 32 KB Flash fits typical 4–8 kB logger firmwares with headroom for EEPROM-backed configuration. The 8-channel 10-bit ADC handles bridge-type sensors such as load cells, thermocouples via amplifier, or 4–20 mA loops with a shunt. At 3.3 V supply and 1 MHz, the part draws only 1.1 mA active, allowing multi-year battery operation when paired with sleep-mode firmware. The JTAG interface simplifies in-circuit debug of FIFO and SD-card write paths during bring-up.
Recommended
Battery-Powered Metering Instrument
For battery-powered metering, the ATMEGA32L-8MI's <1 µA Power-down mode with RTC running lets the device spend most of its life asleep, waking on a timer or external interrupt to take a measurement. The 2.7 V–5.5 V supply range is friendly to single-cell Li-ion chemistries, and the calibrated internal RC oscillator avoids external crystal current draw at low duty cycles. The 32 programmable I/O lines drive LCD segments or e-ink displays, while the USART streams readings to a host MCU.
Recommended
HVAC Building Automation Node
In HVAC building automation nodes the ATMEGA32L-8MI handles sensor aggregation, setpoint logic, and Modbus or BACnet-style UART communication. The hardware TWI block talks to environmental sensors (temperature, humidity, CO2), while the SPI peripheral drives a local display or radio module. Industrial-grade -40C to +85C operation permits placement in plant rooms and ceiling enclosures without active cooling, and the 32 KB Flash comfortably fits layered HVAC control state machines.
Recommended
Lighting and Motor Control MCU
The ATMEGA32L-8MI's two 8-bit timers and one 16-bit timer with separate prescalers deliver PWM channels for LED dimmers, DC motor speed loops, or stepper acceleration profiles. At 8 MHz the part produces 8-bit PWM with sufficient resolution for flicker-free dimming, and the 32 I/O lines can matrix-scan keypad inputs or rotary encoders simultaneously. The wide 2.7 V–5.5 V range supports both 3.3 V logic and 5 V gate-driver interfaces on the same board.
Recommended
Consumer Appliance Control Board
Small kitchen and home appliances use the ATMEGA32L-8MI to run user-interface state machines, sensor fusion, and safety timers. The JTAG port enables production-line OCD programming and on-board firmware updates, while self-programmable Flash supports bootloader-based field upgrades. With 2 KB SRAM the MCU handles menu state, keypad debouncing, and a UART link to a companion Wi-Fi or BLE module without external memory.
Recommended
Automotive Body and Sensor Module
Automotive body and sensor modules can adopt the ATMEGA32L-8MI's pin-compatible AEC-Q100 sibling, ATMEGA32L-8AI, to meet OEM reliability requirements while keeping the same firmware. The 8-channel 10-bit ADC reads multiple analog sensors (battery voltage, current shunt, thermistor), the USART links to a CAN bridge, and the JTAG block speeds up safety-critical firmware validation. Industrial temperature operation in the standard grade covers under-dash and cabin deployments.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA32L-8MI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32L-8MU | ATMEGA32L-8AI | ATMEGA329V-8MI | ATMEGA325V-8MI | ATMEGA32C1-15AZ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-VQFN (7x7) | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Max Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 15 MHz |
| Operating Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 1.8V to 5.5V | 1.8V to 5.5V | 2.7V to 5.5V |
| Automotive Grade (AEC-Q100) | No | No | Yes | No | No | Yes |
| On-chip CAN | No | No | No | No | No | Yes |
| ADC Channels | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit | 8 x 10-bit |
Key Differentiators
- Low-voltage 2.7V–5.5V operation in compact VQFN-44 footprint (vs ATMEGA32L-8PU (PDIP-40))
- Drop-in AEC-Q100 automotive upgrade path (vs ATMEGA32L-8AI)
- Optional on-chip CAN peripheral in same footprint (vs ATMEGA32C1-15AZ)
Design Notes
Place a 0.1 µF decoupling capacitor as close as possible to each VCC pin (4 VCC pins on the 44-VQFN) and add a single 10 µF bulk capacitor on the supply rail. For AVCC, add a 10 µH inductor or ferrite bead between VCC and AVCC, plus a 100 nF + 10 µF decoupling pair, to keep ADC measurements clean. Tie unused ADC inputs to AVCC or GND through a defined level to avoid floating-channel injection.
The 44-VQFN (7x7 mm) package exposes a thermal pad on the underside; solder it to a copper land with at least 8 thermal vias to the inner ground plane to keep junction temperature low. Keep crystal traces short and symmetric, guard them with a ground ring, and route JTAG signals away from switching nodes to preserve OCD signal integrity.
Do not assume the internal 1 MHz RC oscillator is accurate enough for UART baud rates above 9600; either enable the UART baud-rate compensation in firmware or fit an external crystal matched to the CKSEL fuses for the application. Reset must be held low with an external pull-up (typically 10 kΩ) and a 100 nF capacitor to ground for clean power-on behavior. Setting the wrong CKSEL fuse combination can lock the device; always verify fuse settings using a JTAG or ISP programmer before final deployment.
Compliance Information
RoHS and REACH compliance per Microchip product page; lead-free and halogen-free package finish. The ATMEGA32L-8MI itself is not AEC-Q100 qualified - choose the ATMEGA32L-8AI for automotive AEC-Q100 applications.
