ATMEGA32-16AQR - 8-Bit AVR MCU 32KB 16MHz | Microchip
MPN: ATMEGA32-16AQR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.15 | $515.00 |
| 500 | $4.63 | $2,315.00 |
| 1,000 | $4.12 | $4,120.00 |
ATMEGA32-16AQR Overview
An AVR microcontroller is a Harvard-architecture 8-bit RISC device that executes most instructions in a single clock cycle from on-chip Flash memory. Within the product taxonomy, the ATmega32 sits under AVR 8-bit MCUs, which belong to the broader microcontroller family, itself a subset of embedded processors and integrated circuits. The ATmega32 family is one of the most widely deployed 8-bit MCU platforms in industrial, consumer, and educational designs because of its 5V operation, rich peripheral set, and mature toolchain.
Key features include 32 KB ISP Flash with read-while-write capability, 1 KB EEPROM for non-volatile parameter storage, 2 KB SRAM, 32 general-purpose working registers, 54 general-purpose I/O lines in the TQFP-44 package, an 8-channel 10-bit ADC, a JTAG interface for on-chip debug and boundary scan, and two USARTs. The device supports self-programming via a boot loader, enabling field firmware updates without an external programmer.
The ATmega32 uses Microchip's low-power AVR 8-bit RISC core with 131 powerful instructions, most executing in a single clock cycle. The 16 MHz maximum clock yields 16 MIPS, and the 5V operating range provides strong noise immunity for industrial environments. The -16AQR suffix denotes 16 MHz, TQFP package, extended temperature range, Green/RoHS-compliant construction, and tape-and-reel packaging.
Typical applications include industrial control panels, motor control, battery chargers, home automation nodes, data loggers, and educational embedded platforms. The 5V I/O and 10-bit ADC make it well suited to direct sensor interfacing without level shifting.
When designing with this device, decouple every VCC pin with a 100 nF ceramic capacitor placed close to the pin, and provide a clean analog supply for AVCC when using the ADC. Note that Microchip recommends the newer ATmega32A for new designs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for selection and second-sourcing.
Drop-in alternatives for ATMEGA32-16AQR 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 ATMEGA32-16AQR (same form factor and footprint) β differing in Package, Debug Interface, Core Architecture, Maximum Clock Frequency, ADC.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA32A-AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA32-16AC
β Drop-Inβ In Stock
$4.48 / Unit
View Datasheet βATMEGA32-16AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA32L-8AU
β Drop-Inβ In Stock
$3.33 / Unit
View Datasheet βATMEGA32-16AQR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Program Memory | 32 KB ISP Flash (16K x 16) |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| Maximum Clock Frequency | 16 MHz |
| Throughput | Up to 16 MIPS at 16 MHz |
| Instruction Set | 131 powerful instructions, most single-clock cycle |
| General Purpose Working Registers | 32 x 8-bit |
| General Purpose I/O Lines | 54 (TQFP-44 package) |
| ADC | 8-channel, 10-bit |
| Operating Voltage | 4.5 V to 5.5 V |
| Operating Temperature | -40C to +85C (extended) |
| Package | 44-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Debug Interface | JTAG (on-chip debug and boundary scan) |
| USART | 2 |
| Flash Endurance | 10,000 write/erase cycles |
| Packaging | Tape & Reel |
| RoHS Status | Compliant (Green) |
ATMEGA32-16AQR Pin Configuration
| Pin 1 | PB0 β Port B bit 0 / T0 / XCK |
| Pin 2 | PB1 β Port B bit 1 / T1 |
| Pin 3 | PB2 β Port B bit 2 / INT2 / AIN0 |
| Pin 4 | PB3 β Port B bit 3 / AIN1 / OC0 |
| Pin 5 | PB4 β Port B bit 4 / SS |
| Pin 6 | PB5 β Port B bit 5 / MOSI |
| Pin 7 | PB6 β Port B bit 6 / MISO |
| Pin 8 | PB7 β Port B bit 7 / SCK |
| Pin 9 | RESET β Reset input (active low) |
| Pin 10 | VCC β Digital supply voltage |
| Pin 11 | GND β Ground |
| Pin 12 | XTAL2 β Crystal oscillator output |
| Pin 13 | XTAL1 β Crystal oscillator input |
| Pin 14 | PD0 β Port D bit 0 / RXD |
| Pin 15 | PD1 β Port D bit 1 / TXD |
| Pin 16 | PD2 β Port D bit 2 / INT0 |
| Pin 17 | PD3 β Port D bit 3 / INT1 |
| Pin 18 | PD4 β Port D bit 4 / OC1B |
| Pin 19 | PD5 β Port D bit 5 / OC1A |
| Pin 20 | PD6 β Port D bit 6 / ICP1 |
| Pin 21 | PD7 β Port D bit 7 / OC2 |
| Pin 22 | PC0 β Port C bit 0 / ADC0 |
| Pin 23 | PC1 β Port C bit 1 / ADC1 |
| Pin 24 | PC2 β Port C bit 2 / ADC2 |
| Pin 25 | PC3 β Port C bit 3 / ADC3 |
| Pin 26 | PC4 β Port C bit 4 / ADC4 |
| Pin 27 | PC5 β Port C bit 5 / ADC5 |
| Pin 28 | PC6 β Port C bit 6 / ADC6 |
| Pin 29 | PC7 β Port C bit 7 / ADC7 |
| Pin 30 | AVCC β Analog supply voltage for ADC |
| Pin 31 | GND β Ground |
| Pin 32 | AREF β Analog reference voltage for ADC |
| Pin 33 | PA7 β Port A bit 7 / ADC7 |
| Pin 34 | PA6 β Port A bit 6 / ADC6 |
| Pin 35 | PA5 β Port A bit 5 / ADC5 |
| Pin 36 | PA4 β Port A bit 4 / ADC4 |
| Pin 37 | PA3 β Port A bit 3 / ADC3 |
| Pin 38 | PA2 β Port A bit 2 / ADC2 |
| Pin 39 | PA1 β Port A bit 1 / ADC1 |
| Pin 40 | PA0 β Port A bit 0 / ADC0 |
| Pin 41 | VCC β Digital supply voltage |
| Pin 42 | GND β Ground |
| Pin 43 | TCK β JTAG test clock |
| Pin 44 | TMS β JTAG test mode select |
Typical Applications
ATMEGA32-16AQR is suitable for 6 applications: Industrial Control Panels, Battery Chargers and Power Management, Home Automation Nodes, Data Loggers and Instrumentation, Motor Control, Embedded Education and Prototyping.
Industrial Control Panels
The ATMEGA32-16AQR fits industrial control panels because its 4.5-5.5 V operating range and -40C to +85C extended temperature rating tolerate the noisy 5V rails and wide ambient swings found on factory floors. Its 54 general-purpose I/O lines in the 44-pin TQFP package can drive relays, read limit switches, and interface with 5V optocouplers directly, without level shifters. The 8-channel 10-bit ADC samples analog sensors such as thermistors and pressure transducers, while the dual USARTs provide Modbus or serial HMI links. Placed on a control board with a 100 nF decoupling capacitor on each VCC pin, the device adds no switching noise to the analog front end, but designers must budget the 16 MHz clock's supply current when sizing the 5V regulator.
Recommended
Battery Chargers and Power Management
The ATMEGA32-16AQR suits battery charger control because its 8-channel 10-bit ADC monitors cell voltage and temperature while the 16 MHz core runs charge-profile state machines in real time. The 32 KB Flash stores multiple battery chemistry profiles, and the 1 KB EEPROM retains calibration constants and cycle counters across power loss. PWM outputs from the 8-bit timers drive the charge FET gate through a driver stage, and the 5V I/O interfaces directly with shunt amplifiers and thermistor dividers. Because the device operates down to 4.5 V, it can run from a regulated 5V auxiliary rail derived from the battery, but designers should note that unlike a dedicated charger IC it dissipates no power in the charge path itself, so thermal design focuses on the external FET.
Recommended
Home Automation Nodes
The ATMEGA32-16AQR is well suited to home automation nodes because its 5V I/O and 54 GPIO lines interface directly with relays, triacs, and 5V sensor modules without level shifting, simplifying node hardware. The 32 KB Flash holds protocol stacks and scene logic, while 2 KB SRAM buffers sensor telemetry and the 1 KB EEPROM stores network credentials and device addresses. Dual USARTs allow one port for a wireless module and one for local diagnostics. Running at 16 MHz, the core handles polling of PIR, reed, and temperature sensors with ample margin. Placed on a node PCB with a 100 nF decoupling capacitor per VCC pin, the MCU adds negligible noise, though designers should keep the crystal traces short to avoid EMI coupling into the ADC.
Recommended
Data Loggers and Instrumentation
The ATMEGA32-16AQR fits data loggers because the 8-channel 10-bit ADC digitizes sensor channels while the 32 KB Flash and 1 KB EEPROM store sample buffers and calibration data without external memory. The JTAG interface supports in-system debug and boundary scan, which shortens bring-up of multi-channel acquisition firmware. At 16 MHz the core performs oversampling and averaging in real time, improving effective ADC resolution. The 5V operating range allows direct connection to 5V instrumentation amplifiers and multiplexers. In a logger design the MCU is typically paired with an external serial Flash or SD card for bulk storage, and designers must decouple AVCC separately from VCC with an LC filter to keep ADC noise below one LSB.
Recommended
Motor Control
The ATMEGA32-16AQR supports motor control applications because its 16 MHz core executes PID loops fast enough for brushed DC and stepper commutation, while the 8-bit timers generate PWM for H-bridge gate drivers. The 8-channel 10-bit ADC reads current shunts and position potentiometers, and the 54 GPIO lines handle limit switches, encoder inputs, and fault signals. The 5V I/O drives gate driver logic directly, avoiding level shifters. The extended -40C to +85C rating covers industrial motor enclosures. Because the device has no dedicated motor-control PWM peripheral, designers implement commutation in firmware, which costs CPU cycles but keeps BOM cost low; a 100 nF decoupling capacitor per VCC pin and a separate analog supply for AVCC are essential to keep ADC current-sense readings clean.
Recommended
Embedded Education and Prototyping
The ATMEGA32-16AQR is a strong choice for embedded education and prototyping because its 5V operation is tolerant of breadboard wiring and its 44-pin TQFP package exposes 54 GPIO lines for teaching parallel I/O, timers, ADC, and serial protocols. The 32 KB Flash accommodates substantial student projects, and the JTAG interface provides on-chip debug without an external emulator. The mature AVR toolchain and abundant reference material lower the learning curve. In a teaching lab the device is typically mounted on a breakout board with a 16 MHz crystal and 22 pF load capacitors, and each VCC pin is decoupled with 100 nF. Unlike 3.3V ARM boards, the 5V I/O lets students drive LEDs and buzzers directly without transistor buffers.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA32-16AQR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32A-AU | ATMEGA32-16AC | ATMEGA32-16AU | ATMEGA32L-8AU |
|---|---|---|---|---|---|
| Package | 44-TQFP (10x10) | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same | 44-TQFP (10x10) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Maximum Clock Frequency | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 8 MHz |
| Program Memory | 32 KB Flash | 32 KB Flash | 32 KB Flash | 32 KB Flash | 32 KB Flash |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Operating Voltage | 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 | 2.7 V to 5.5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | 0C to +70C (commercial) | -40C to +85C | -40C to +85C |
| GPIO Lines | 54 | 54 | 54 | 54 | 54 |
| ADC | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit | 8-channel 10-bit |
| Packaging | Tape & Reel | Tray | Tray | Tray | Tray |
Key Differentiators
- Extended temperature grade in tape-and-reel (vs ATMEGA32-16AC)
- 16 MHz speed grade with 5V operation (vs ATMEGA32L-8AU)
- Newer recommended revision available as drop-in (vs ATMEGA32A-AU)
Design Notes
Decouple every VCC pin (pins 10 and 41) with a 100 nF ceramic capacitor placed within a few millimeters of the pin, and add a 10 uF bulk capacitor per board. Supply AVCC (pin 30) through a separate LC filter from VCC to keep digital switching noise out of the ADC reference path. Estimated: at 16 MHz and 5V the core draws on the order of 15 mA, so a 100 mA LDO with 10 uF output capacitance provides ample margin.
Keep the 16 MHz crystal and its 22 pF load capacitors as close to XTAL1/XTAL2 (pins 13 and 12) as possible, with a solid ground plane beneath and no traces routed under the crystal. Route the JTAG signals (TCK, TMS, TDI, TDO) away from the analog input traces to avoid coupling into the 10-bit ADC. Place the AREF bypass capacitor directly at pin 32.
Do not leave the RESET pin floating; add a 10 kOhm pull-up to VCC and a 100 nF capacitor to ground to prevent spurious resets in noisy environments. Note that Microchip recommends the newer ATmega32A for new designs, so verify firmware compatibility and fuse settings when migrating. Ensure the ISP/JTAG programming interface is not loaded by external circuitry during in-system programming.
Compliance Information
Distributor listings describe the ATMEGA32-16AQR as Green and RoHS compliant. REACH, halogen-free, and conflict-minerals status are not stated in the verified data and are marked unknown rather than assumed.
