ATMEGA32-16AUR - 8-Bit AVR MCU 32KB Flash 16MHz | Microchip
MPN: ATMEGA32-16AUR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.88 | $48.80 |
| 100 | $4.31 | $431.00 |
| 500 | $3.95 | $1,975.00 |
| 1,000 | $3.62 | $3,620.00 |
| 2,000 | $3.41 | $6,820.00 |
ATMEGA32-16AUR 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 hierarchy, the ATmega32 sits under 8-bit AVR microcontrollers, which belong to the broader microcontroller (MCU) family, itself a subset of embedded processing ICs. The ATmega32 integrates 32 general-purpose working registers, 54/69 general-purpose I/O lines, an 8-channel 10-bit ADC, and a JTAG interface for on-chip debug and boundary scan.
Key differentiators include 32 KB ISP flash with read-while-write capability, 1 KB EEPROM for non-volatile parameter storage, 2 KB SRAM, and a rich peripheral set: two 8-bit timers, one 16-bit timer, four PWM channels, USART, SPI, and TWI (I2C) serial interfaces, plus an analog comparator and programmable watchdog. The 16 MHz maximum clock yields 16 MIPS, and the 4.5-5.5 V operating range makes the device directly compatible with legacy 5 V logic.
The device uses Atmel/Microchip's low-power CMOS process and supports six sleep modes, including Idle, Power-save, and Power-down, drawing under 1 uA in Power-down at 5 V. In-system programming via SPI or JTAG allows field firmware updates without removing the MCU from the board.
Typical applications include industrial control panels, motor control, battery chargers, home automation nodes, and legacy 5 V embedded designs migrating from AT89C51-class parts. The 44-pin TQFP footprint is shared with the ATmega16 and ATmega32A families, enabling straightforward migration.
When designing with the ATMEGA32-16AUR, decouple every VCC pin with 100 nF ceramic capacitors placed within a few millimeters of the pin, and use a 10 uF bulk capacitor on the main rail. The AREF pin requires a low-impedance reference source for ADC accuracy.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for procurement and layout decisions.
Drop-in alternatives for ATMEGA32-16AUR 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 ATMEGA32-16AUR (same form factor and footprint) β differing in Package, RoHS Status, Debug Interface, Operating Temperature, Timers.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATMEGA32A-AUR
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA32-16AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA32A-AU
β Drop-Inπ Reference alternative (not in catalog)
ATMEGA32-16AC
β Drop-Inβ In Stock
$4.48 / Unit
View Datasheet βATMEGA32-16AQR
β Drop-Inβ In Stock
$4.12 / Unit
View Datasheet βATMEGA16A-AU
β Drop-Inβ In Stock
$2.05 / Unit
View Datasheet βATMEGA32-16AUR Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit AVR RISC |
| Program Memory Size | 32 KB (16K x 16) Flash |
| Program Memory Type | In-System Programmable Flash |
| EEPROM | 1 KB |
| SRAM | 2 KB |
| Maximum Clock Frequency | 16 MHz |
| Throughput | 16 MIPS at 16 MHz |
| Supply Voltage Range | 4.5 V to 5.5 V |
| General Purpose I/O Lines | 54/69 |
| General Purpose Working Registers | 32 |
| ADC | 8-channel, 10-bit |
| Timers | 2 x 8-bit, 1 x 16-bit |
| PWM Channels | 4 |
| Serial Interfaces | USART, SPI, TWI (I2C) |
| Debug Interface | JTAG (boundary scan + on-chip debug) |
| Package | 44-TQFP (10x10 mm, 0.80 mm pitch) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| Instruction Set | 131 powerful instructions, most single-clock cycle |
| RoHS Status | Compliant |
ATMEGA32-16AUR Pin Configuration
| Pin 1 | PB0 β Port B bit 0 (also XCK/T0) |
| Pin 2 | PB1 β Port B bit 1 (also T1) |
| Pin 3 | PB2 β Port B bit 2 (also INT2/AIN0) |
| Pin 4 | PB3 β Port B bit 3 (also AIN1/OC0) |
| Pin 5 | PB4 β Port B bit 4 (also SS) |
| Pin 6 | PB5 β Port B bit 5 (also MOSI) |
| Pin 7 | PB6 β Port B bit 6 (also MISO) |
| Pin 8 | PB7 β Port B bit 7 (also 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 (also RXD) |
| Pin 15 | PD1 β Port D bit 1 (also TXD) |
| Pin 16 | PD2 β Port D bit 2 (also INT0) |
| Pin 17 | PD3 β Port D bit 3 (also INT1) |
| Pin 18 | PD4 β Port D bit 4 (also OC1B) |
| Pin 19 | PD5 β Port D bit 5 (also OC1A) |
| Pin 20 | PD6 β Port D bit 6 (also ICP1) |
| Pin 21 | PD7 β Port D bit 7 (also OC2) |
| Pin 22 | PC0 β Port C bit 0 (also SCL) |
| Pin 23 | PC1 β Port C bit 1 (also SDA) |
| Pin 24 | PC2 β Port C bit 2 (also TCK) |
| Pin 25 | PC3 β Port C bit 3 (also TMS) |
| Pin 26 | PC4 β Port C bit 4 (also TDO) |
| Pin 27 | PC5 β Port C bit 5 (also TDI) |
| Pin 28 | PC6 β Port C bit 6 (also TOSC1) |
| Pin 29 | PC7 β Port C bit 7 (also TOSC2) |
| 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 (also ADC7) |
| Pin 34 | PA6 β Port A bit 6 (also ADC6) |
| Pin 35 | PA5 β Port A bit 5 (also ADC5) |
| Pin 36 | PA4 β Port A bit 4 (also ADC4) |
| Pin 37 | PA3 β Port A bit 3 (also ADC3) |
| Pin 38 | PA2 β Port A bit 2 (also ADC2) |
| Pin 39 | PA1 β Port A bit 1 (also ADC1) |
| Pin 40 | PA0 β Port A bit 0 (also ADC0) |
| Pin 41 | VCC β Digital supply voltage |
| Pin 42 | GND β Ground |
| Pin 43 | GND β Ground |
| Pin 44 | GND β Ground |
Typical Applications
ATMEGA32-16AUR is suitable for 6 applications: Industrial Control Panels, Motor Control and Drives, Battery Chargers and Power Management, Home Automation and IoT Nodes, Legacy 5V Embedded System Migration, Educational and Prototyping Boards.
Industrial Control Panels
The ATMEGA32-16AUR fits industrial control panels because its 4.5-5.5 V supply and 5 V I/O interface directly with legacy industrial sensors, relays, and 24 V opto-isolated inputs without level shifters. Its 54/69 GPIO lines can drive multiple relay coils and read limit switches simultaneously, while the 8-channel 10-bit ADC samples analog process signals such as 4-20 mA loops through sense resistors. The 32 KB flash holds ladder-logic interpreters or Modbus RTU stacks, and the 1 KB EEPROM stores calibration constants across power cycles. Placed on a 44-pin TQFP footprint, the device runs at 16 MHz (16 MIPS), fast enough for 1 kHz control loops. Unlike a 3.3 V ARM MCU, it needs no level translation, but it dissipates more power at 5 V, so thermal design should account for roughly 15 mA active current.
Recommended
Motor Control and Drives
The ATMEGA32-16AUR suits motor control because its 16 MHz core and three timers (two 8-bit, one 16-bit) generate four PWM channels for H-bridge or three-phase inverter gate drives. The 10-bit ADC samples current-shunt and back-EMF feedback at up to 15 kSPS, enabling closed-loop speed control. At 16 MIPS, the device executes a PI current loop in under 10 us, adequate for motors up to a few hundred watts. The 5 V I/O drives standard gate drivers such as the IR2101 directly. Designers should note that the ATmega32 lacks a dedicated motor-control PWM unit, so complementary PWM with dead-time must be generated in firmware, adding CPU overhead compared with a dedicated motor-control MCU.
Recommended
Battery Chargers and Power Management
The ATMEGA32-16AUR is well suited to battery charger designs because its 10-bit ADC monitors cell voltage, charge current, and temperature, while PWM outputs regulate charge current in buck or linear topologies. The 1 KB EEPROM logs charge cycles and stores battery chemistry profiles, and the programmable watchdog timer recovers the MCU from fault conditions without external supervision. Operating from 4.5-5.5 V, the device can be powered directly from a 5 V USB rail or a regulated lead-acid system. In sleep mode the ATmega32 draws under 1 uA, allowing the charger controller to remain powered while the main system is off. The main trade-off is that the 8-bit core limits advanced algorithms such as model-based state-of-charge estimation.
Recommended
Home Automation and IoT Nodes
The ATMEGA32-16AUR serves home automation nodes because its USART, SPI, and TWI (I2C) interfaces connect directly to RF transceivers, sensors, and display drivers. The 32 KB flash accommodates protocol stacks such as Zigbee or a lightweight MQTT client, while 2 KB SRAM buffers sensor data. The 5 V I/O simplifies interfacing with relays, TRIAC drivers, and legacy wall-switch wiring. Six sleep modes, including Power-save and Power-down, extend battery life in wireless nodes, and the JTAG interface allows in-field firmware updates. Compared with a 3.3 V Cortex-M0, the ATmega32 consumes more active current but avoids level shifters and offers a mature, well-documented toolchain for rapid development.
Recommended
Legacy 5V Embedded System Migration
The ATMEGA32-16AUR is a common migration target for legacy 8051-class designs because it retains 5 V operation while offering a modern RISC core, in-system programming, and JTAG debug. Its 44-pin TQFP footprint matches the ATmega16 and ATmega32A families, so boards originally laid out for those parts accept the ATMEGA32-16AUR directly. The 131-instruction AVR set executes most operations in one clock cycle, delivering roughly 10x the throughput of a classic 12-clock 8051 at the same frequency. Firmware porting is aided by the large body of open-source AVR libraries and the MightyCore Arduino core, which supports the ATmega32 family. The main consideration is that 5 V operation increases power versus modern 3.3 V parts.
Recommended
Educational and Prototyping Boards
The ATMEGA32-16AUR is widely used in educational and prototyping boards because its 5 V I/O is tolerant of breadboard wiring and directly drives LEDs, buzzers, and LCD modules without level shifters. The 44-pin TQFP is compact enough for student-designed PCBs yet hand-solderable with practice, and the DIP-40 variant ATMEGA32-16PU serves breadboard prototyping. The 32 KB flash and 2 KB SRAM are ample for teaching exercises covering timers, interrupts, ADC, and serial communication. The JTAG interface supports low-cost on-chip debugging, and the MightyCore Arduino core provides a familiar IDE experience. The trade-off versus a modern 32-bit board is lower performance and no native USB, but the simplicity and 5 V compatibility remain pedagogically valuable.
Recommended
Recommended Products Summary
Engineering reference data for ATMEGA32-16AUR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATMEGA32A-AUR | ATMEGA32-16AU | ATMEGA32-16AC | ATMEGA16A-AU |
|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 1 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 512 B |
| Maximum Clock | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Supply 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 | 4.5 V to 5.5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C | -40C to +85C |
| Packaging | Tape & Reel | Tape & Reel | Tray | Tray | Tray |
| Silicon Revision | Original ATmega32 | Newer ATmega32A | Original ATmega32 | Original ATmega32 | ATmega16A (16 KB) |
Key Differentiators
- Tape-and-reel packaging for automated assembly (vs ATMEGA32-16AU)
- Industrial temperature range (vs ATMEGA32-16AC)
- Full 32 KB flash and 2 KB SRAM (vs ATMEGA16A-AU)
- Proven original ATmega32 silicon (vs ATMEGA32A-AUR)
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 on the main 5 V rail. The AVCC pin (pin 30) must be connected to VCC through a low-pass filter, typically a 10 uH inductor or 10 ohm resistor with a 100 nF capacitor to GND, to isolate ADC noise. AREF (pin 32) should be driven from a low-impedance reference; if the internal reference is used, place a 100 nF capacitor from AREF to GND. Estimated: at 16 MHz and 5 V, active current is roughly 15 mA, so a 100 mA LDO provides ample margin.
Route the crystal between XTAL1 (pin 13) and XTAL2 (pin 12) with traces shorter than 10 mm and guard them with ground. Place the two load capacitors (typically 22 pF for a 16 MHz crystal) directly at the pins and connect their ground returns to the MCU ground plane with vias. Keep the RESET pin (pin 9) trace short and add a 10 kohm pull-up to VCC plus a 100 nF capacitor to GND for noise immunity. The 44-pin TQFP has a 0.80 mm pitch, so use a solder mask-defined land pattern and verify stencil aperture per the Microchip package drawing.
Do not leave the RESET pin floating; an unconnected RESET can cause spurious resets in noisy environments. Ensure the JTAG pins (PC2-PC5) are not loaded by external circuitry during programming, or disable JTAG via the fuse bits to free those pins as GPIO. The ATmega32 fuse bits are programmed for the internal 1 MHz RC oscillator by default; set the CKSEL fuses for an external 16 MHz crystal before expecting 16 MHz operation. Estimated: at 5 V and 16 MHz, power dissipation is about 75 mW, well within the 44-pin TQFP thermal capability without a heatsink.
Compliance Information
RoHS and lead-free status per Microchip product page and distributor listings. The ATMEGA32-16AUR is an industrial-grade part and is not AEC-Q100 qualified; automotive designs should use an AEC-Q100 qualified MCU. Halogen-free status was not stated in the retrieved data.
