ATMEGA32L-8MC - 8MHz 8-bit AVR MCU, 32KB Flash, 44-VQFN
MPN: ATMEGA32L-8MC β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.8 | $6.80 |
| 10 | $6.1 | $61.00 |
| 100 | $5.42 | $542.00 |
| 500 | $4.95 | $2,475.00 |
| 1,000 | $4.5 | $4,500.00 |
ATMEGA32L-8MC Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/ROM for program code, SRAM for runtime data, and often EEPROM for non-volatile storage), and programmable peripherals on one silicon die. The 8-bit AVR RISC architecture used in the ATMEGA32L-8MC falls within the broader hierarchy of microcontroller -> embedded processor -> semiconductor IC. Its Harvard-style memory layout and single-cycle instruction execution yield deterministic, cycle-accurate timing that engineers rely on for interrupt-driven firmware.
Key features include 131 instructions (mostly single-cycle), 32 general-purpose working registers, an 8-channel 10-bit successive-approximation ADC, two 8-bit and one 16-bit timer/counter, a full-duplex USART, SPI and TWI (I2C) serial interfaces, and a JTAG interface for on-chip debug. The 44-VQFN (7x7 mm) package exposes a thermal pad that must be soldered to the PCB ground plane for proper heat dissipation and electrical performance.
The 'L' suffix designates the low-voltage (2.7 V to 5.5 V) variant and the 'MC' suffix specifies the VQFN package, commercial temperature grade (0 C to +70 C). An internal calibrated RC oscillator simplifies BOM cost, while the JTAG and In-System Programming interfaces support field upgrades. Compared with the non-L ATmega32 variants, the ATMEGA32L-8MC operates at lower maximum frequency but offers wider voltage tolerance.
Typical applications include consumer appliances, sensor signal conditioning nodes, low-cost motor control, human-interface panels, and industrial telemetry. Designers choose this MCU for its mature toolchain (AVR-GCC, Atmel Studio 7, Microchip Studio) and rich peripheral set, which accelerates time-to-market.
When designing, place 100 nF decoupling capacitors close to each VCC/AVCC pin, tie the exposed pad to a solid ground pour, and reserve RESET pull-up and crystal load capacitors even if the internal oscillator is used initially. The 10-bit ADC accuracy depends on clean analog supply; use a ferrite bead + capacitor network to isolate AVCC from digital noise.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATMEGA32L-8MC β 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-8MC (same form factor and footprint) β differing in Package, Core Architecture, ADC, EEPROM, General Purpose I/O.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA32L-8MU
β Drop-Inβ In Stock
$3.85 / Unit
View Datasheet βATMEGA32-16MC
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA32A-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA32A-MC
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ATMEGA64A-MU
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$4.24 / Unit
View Datasheet βATMEGA32L-8MC Maximum Ratings & Electrical Characteristics
| Core Architecture | AVR 8-bit RISC |
| Maximum Clock Frequency | 8 MHz |
| Instruction Throughput | 8 MIPS at 8 MHz |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Supply Voltage (Vcc) | 2.7 V to 5.5 V |
| ADC | 8-channel, 10-bit |
| Timer/Counters | 2 x 8-bit, 1 x 16-bit |
| Serial Interfaces | 1 x USART, 1 x SPI, 1 x TWI (I2C) |
| Package | 44-pin VQFN (7x7 mm) with exposed pad |
| Operating Temperature (Commercial) | 0 C to +70 C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Debug Interface | JTAG / In-System Programming |
| Instruction Set | 131 instructions, mostly single-cycle |
ATMEGA32L-8MC Pin Configuration
| Pin 1 | PD3 (INT1) β Port D bit 3 / External Interrupt 1 |
| Pin 2 | PD4 (OC1B) β Port D bit 4 / Timer1 Compare Match B |
| Pin 3 | GND β Ground |
| Pin 4 | VCC β Digital supply voltage |
| Pin 5 | GND β Ground |
| Pin 6 | VCC β Digital supply voltage |
| Pin 7 | PB6 (OC2) β Port B bit 6 / Timer0 Compare Match |
| Pin 8 | PB7 (OC1C) β Port B bit 7 / Timer1 Compare Match C |
| Pin 9 | PD5 (OC1A) β Port D bit 5 / Timer1 Compare Match A |
| Pin 10 | PD6 (ICP1) β Port D bit 6 / Timer1 Input Capture |
| Pin 11 | PD7 (OC2) β Port D bit 7 / Timer2 Compare Match |
| Pin 12 | PA0 (ADC0) β Port A bit 0 / ADC channel 0 |
| Pin 13 | PA1 (ADC1) β Port A bit 1 / ADC channel 1 |
| Pin 14 | PA2 (ADC2) β Port A bit 2 / ADC channel 2 |
| Pin 15 | PA3 (ADC3) β Port A bit 3 / ADC channel 3 |
| Pin 16 | PA4 (ADC4) β Port A bit 4 / ADC channel 4 |
| Pin 17 | PA5 (ADC5) β Port A bit 5 / ADC channel 5 |
| Pin 18 | PA6 (ADC6) β Port A bit 6 / ADC channel 6 |
| Pin 19 | PA7 (ADC7) β Port A bit 7 / ADC channel 7 |
| Pin 20 | AVCC β Analog supply voltage |
| Pin 21 | AREF β ADC reference voltage |
| Pin 22 | GND β Ground |
| Pin 23 | PC0 (SCL) β Port C bit 0 / TWI clock |
| Pin 24 | PC1 (SDA) β Port C bit 1 / TWI data |
| Pin 25 | PC2 (TCK) β Port C bit 2 / JTAG TCK |
| Pin 26 | PC3 (TMS) β Port C bit 3 / JTAG TMS |
| Pin 27 | PC4 (TDO) β Port C bit 4 / JTAG TDO |
| Pin 28 | PC5 (TDI) β Port C bit 5 / JTAG TDI |
| Pin 29 | PC6 (TOSC1) β Port C bit 6 / Timer Oscillator pin 1 |
| Pin 30 | PC7 (TOSC2) β Port C bit 7 / Timer Oscillator pin 2 |
| Pin 31 | PD0 (RXD) β Port D bit 0 / USART RXD |
| Pin 32 | PD1 (TXD) β Port D bit 1 / USART TXD |
| Pin 33 | PD2 (INT0) β Port D bit 2 / External Interrupt 0 |
| Pin 34 | PB0 (SS) β Port B bit 0 / SPI Slave Select |
| Pin 35 | PB1 (SCK) β Port B bit 1 / SPI clock |
| Pin 36 | PB2 (MOSI) β Port B bit 2 / SPI MOSI |
| Pin 37 | PB3 (MISO) β Port B bit 3 / SPI MISO |
| Pin 38 | PB4 (OC0) β Port B bit 4 / Timer0 Compare Match |
| Pin 39 | PB5 (OC1A) β Port B bit 5 / Timer1 Compare Match A |
| Pin 40 | RESET β Reset input (active low) |
| Pin 41 | VCC β Digital supply voltage |
| Pin 42 | GND β Ground |
| Pin 43 | XTAL2 β Crystal oscillator output |
| Pin 44 | XTAL1 β Crystal oscillator input |
Typical Applications
ATMEGA32L-8MC is suitable for 6 applications: Consumer Appliance Control, Industrial Sensor Interface, Hobby / Educational Embedded Platform, Battery-Powered Telemetry Node, Human-Machine Interface (HMI) Panel, Low-Cost Motor Control.
Consumer Appliance Control
The ATMEGA32L-8MC's 8 MIPS throughput at 8 MHz and rich peripheral set (USART, SPI, TWI) make it well-suited for white-goods control boards. The 8-channel 10-bit ADC reads temperature sensors, motor currents, and user potentiometers with adequate resolution for thermostat, washing-machine, and dishwasher control loops. Its 2.7 V to 5.5 V supply range simplifies integration with both 3.3 V sensor ICs and 5 V relay drivers, while the 32 KB Flash provides ample room for state-machine firmware and user-interface tables. Pair with a ULN2003 driver for relay control and an HD44780 LCD for user feedback.
Recommended
Industrial Sensor Interface
In a 4-20 mA or Modbus sensor front-end, the ATMEGA32L-8MC performs ADC sampling, linearization, and digital output conditioning. Its 10-bit ADC combined with internal 2.56 V reference yields 2.5 mV LSB resolution - sufficient for temperature, pressure, and humidity transducers in non-precision telemetry. The hardware TWI (I2C) and SPI peripherals connect to industrial EEPROMs, DACs, and isolated transceivers without firmware bit-banging, freeing CPU bandwidth for protocol handling. Operating temperature range of 0 C to +70 C and the wide supply voltage tolerance make it robust in factory-floor enclosures.
Recommended
Hobby / Educational Embedded Platform
Thanks to its mature AVR-GCC toolchain and vast community support, the ATMEGA32L-8MC is widely used in university coursework and hobby robotics. The exposed-pad 44-VQFN is overkill for breadboard experiments, but the same die in ATmega32-16PU (DIP-40) lets students start with through-hole prototyping and later migrate code to the VQFN production variant. The 8-channel ADC and 16-bit timer/counter simplify line-following, encoder feedback, and PID control demos. Pair with an Arduino-style bootloader over ISP for rapid iteration.
Recommended
Battery-Powered Telemetry Node
The 'L' suffix and 2.7 V minimum supply make the ATMEGA32L-8MC usable with a single Li-ion or 2xAA battery source. Active current is approximately 1.1 mA at 3 V / 8 MHz, dropping to under 1 uA in power-down mode - ideal for duty-cycled remote sensors. With the ADC disabled and the core sleeping between sensor reads, multi-year battery life is achievable on a 2000 mAh cell. The 1 KB EEPROM provides non-volatile storage for calibration coefficients and event logs.
Recommended
Human-Machine Interface (HMI) Panel
Driving a small character LCD or button matrix is straightforward with the ATMEGA32L-8MC's 32 programmable I/O pins, two 8-bit and one 16-bit timer/counter, and JTAG debug support. The USART can serve a Wi-Fi/Bluetooth module for remote monitoring, while the TWI/I2C port drives an RGB LED controller or capacitive touch sensor IC. The 44-VQFN (7x7 mm) package fits inside small HMI bezels while exposing enough pins for 4x4 keypads, encoder inputs, and PWM backlight control.
Recommended
Low-Cost Motor Control
The 16-bit timer/counter with PWM output, combined with the ADC's ability to sample back-EMF or current-sense amplifiers, makes the ATMEGA32L-8MC suitable for brushed DC and small BLDC motor control. Six PWM channels (two per timer) drive H-bridge gate drivers, while the ADC synchronously samples motor current for torque limiting. The 2 KB SRAM accommodates PI/D state-machine buffers and serial command queues, and the hardware USART simplifies connection to RS-485 half-duplex industrial networks.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA32L-8MC β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32L-8MU | ATMEGA32-16MC | ATMEGA32A-MU | ATMEGA32A-MC | ATMEGA64A-MU |
|---|---|---|---|---|---|---|
| Package | 44-VQFN (7x7) | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same | 44-VQFN (7x7) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock | 8 MHz | 8 MHz (calibrated) | 16 MHz | 16 MHz | 16 MHz | 20 MHz |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 64 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 4 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 2 KB |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Temperature Grade | Commercial (0 to +70 C) | Commercial / Industrial | Commercial | Industrial (-40 to +85 C) | Commercial | Industrial |
| Lifecycle Status | NRND | Active | Active | Active | Active | Active |
Key Differentiators
- Wide 2.7-5.5 V supply supports both 3.3 V and 5 V designs (vs ATMEGA32-16MC)
- Low-power 8 MHz variant with same Flash/RAM/EEPROM as active members (vs ATMEGA32A-MU)
- Compact 44-VQFN with exposed thermal pad (vs ATMEGA32L-8PU (DIP-40))
- Dual 8-bit plus 16-bit timer/counter with PWM and input capture (vs ATMEGA64A-MU)
Design Notes
Decoupling: place a 100 nF ceramic decoupling capacitor close to each VCC/AVCC pin (within 2-3 mm trace length). Add a single 10 uF bulk capacitor near the supply pins. The 44-VQFN exposed pad must be soldered to a continuous ground pour with thermal vias connecting to the inner ground plane; failing to solder the e-pad will cause thermal and electrical performance degradation.
Analog supply isolation: connect AVCC to VCC through a ferrite bead (e.g., BLM18AG series) and bypass with 10 uF + 100 nF to ground. This isolates ADC reference from digital switching noise. Power-down current drops below 1 uA only when Brown-Out Detector (BOD) is disabled or the core is in Power-Save mode with peripherals disabled.
Clock configuration: do not leave XTAL1/XTAL2 floating if the internal RC oscillator is used - configure them as GPIO or tie XTAL2 to ground through a 1 M resistor to prevent parasitic oscillation. The 'L' variants support 8 MHz internal RC; for higher-speed applications upgrade to the 16 MHz ATmega32-16MC or 20 MHz ATmega32A-MU.
JTAG layout: route the four JTAG signals (TCK, TMS, TDO, TDI on PC2-PC5) as short parallel traces with a ground return path, and avoid routing them adjacent to switching power traces to preserve debug integrity. If JTAG is unused, the pins can serve as standard GPIO but cannot be used for ADC or TWI simultaneously.
Estimated: VQFN-44 junction-to-ambient thermal resistance (theta_JA) is approximately 32 C/W on a standard 4-layer 1-oz JEDEC test board. With 8 MHz active current of ~6 mA at 5 V (30 mW), self-heating is negligible. In sleep modes power dissipation drops below 5 uA, so thermal shutdown will not engage under normal conditions.
Compliance Information
RoHS and lead-free confirmed per Microchip product declaration. AEC-Q100 not applicable for commercial-grade MCU. Halogen-free status not explicitly stated - verify with Microchip if required for your application.
