ATMEGA32A-AU from Microchip, in a TQFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	PB5/MOSI	bidirectional	Port B bit 5. Alt function: SPI Master Out Slave In. Internal pull-up available.
2	PB6/MISO	bidirectional	Port B bit 6. Alt function: SPI Master In Slave Out.
3	PB7/SCK	bidirectional	Port B bit 7. Alt function: SPI Bus Serial Clock.
4	RESET	input	Active-low external reset input. A low level longer than the minimum pulse width generates a reset even if the clock is not running.
5	VCC	power_in	Digital supply voltage (2.7-5.5V).
6	GND	power_in	Digital ground.
7	XTAL2	output	Output from the inverting oscillator amplifier. Connect to crystal/resonator with XTAL1.
8	XTAL1	input	Input to the inverting oscillator amplifier and internal clock operating circuit.
9	PD0/RXD	bidirectional	Port D bit 0. Alt function: USART Receive.
10	PD1/TXD	bidirectional	Port D bit 1. Alt function: USART Transmit.
11	PD2/INT0	bidirectional	Port D bit 2. Alt function: External Interrupt 0.
12	PD3/INT1	bidirectional	Port D bit 3. Alt function: External Interrupt 1.
13	PD4/OC1B	bidirectional	Port D bit 4. Alt function: Timer/Counter1 Compare Match B output / PWM.
14	PD5/OC1A	bidirectional	Port D bit 5. Alt function: Timer/Counter1 Compare Match A output / PWM.
15	PD6/ICP1	bidirectional	Port D bit 6. Alt function: Timer/Counter1 Input Capture.
16	PD7/OC2	bidirectional	Port D bit 7. Alt function: Timer/Counter2 Compare Match output / PWM.
17	VCC	power_in	Digital supply voltage (2.7-5.5V). All VCC pins must be tied together.
18	GND	power_in	Digital ground.
19	PC0/SCL	bidirectional	Port C bit 0. Alt function: Two-Wire Serial Interface Clock.
20	PC1/SDA	bidirectional	Port C bit 1. Alt function: Two-Wire Serial Interface Data.
21	PC2/TCK	bidirectional	Port C bit 2. Alt function: JTAG Test Clock. Pull-up enabled when JTAG is active.
22	PC3/TMS	bidirectional	Port C bit 3. Alt function: JTAG Test Mode Select. Pull-up enabled when JTAG is active.
23	PC4/TDO	bidirectional	Port C bit 4. Alt function: JTAG Test Data Out. Tri-stated unless TAP is shifting data out.
24	PC5/TDI	bidirectional	Port C bit 5. Alt function: JTAG Test Data In. Pull-up enabled when JTAG is active.
25	PC6/TOSC1	bidirectional	Port C bit 6. Alt function: Timer Oscillator pin 1 (async 32.768 kHz crystal for RTC).
26	PC7/TOSC2	bidirectional	Port C bit 7. Alt function: Timer Oscillator pin 2 (async 32.768 kHz crystal for RTC).
27	AVCC	power_in	Analog supply voltage for Port A and the ADC. Must be connected to VCC (through an LC filter if ADC is used).
28	GND	power_in	Analog/digital ground.
29	AREF	input	Analog reference voltage input for the A/D Converter.
30	PA7/ADC7	bidirectional	Port A bit 7. Alt function: ADC channel 7.
31	PA6/ADC6	bidirectional	Port A bit 6. Alt function: ADC channel 6.
32	PA5/ADC5	bidirectional	Port A bit 5. Alt function: ADC channel 5.
33	PA4/ADC4	bidirectional	Port A bit 4. Alt function: ADC channel 4.
34	PA3/ADC3	bidirectional	Port A bit 3. Alt function: ADC channel 3.
35	PA2/ADC2	bidirectional	Port A bit 2. Alt function: ADC channel 2.
36	PA1/ADC1	bidirectional	Port A bit 1. Alt function: ADC channel 1.
37	PA0/ADC0	bidirectional	Port A bit 0. Alt function: ADC channel 0.
38	VCC	power_in	Digital supply voltage (2.7-5.5V).
39	GND	power_in	Digital ground.
40	PB0/XCK/T0	bidirectional	Port B bit 0. Alt functions: USART External Clock (XCK) / Timer/Counter0 external counter input (T0).
41	PB1/T1	bidirectional	Port B bit 1. Alt function: Timer/Counter1 external counter input (T1).
42	PB2/AIN0/INT2	bidirectional	Port B bit 2. Alt functions: Analog Comparator positive input (AIN0) / External Interrupt 2.
43	PB3/AIN1/OC0	bidirectional	Port B bit 3. Alt functions: Analog Comparator negative input (AIN1) / Timer/Counter0 Compare Match output (OC0).
44	PB4/SS	bidirectional	Port B bit 4. Alt function: SPI Slave Select (active low).

Key specifications

Parameter	Value
Manufacturer	Microchip
Package	TQFP-44(10x10)
Category	MCU
Pins	44

Ordering variants

ATMEGA32A-AU
ATMEGA32A-AUR
ATMEGA32A-AUMU
ATMEGA32A-AUMUR
ATMEGA32A-AUPU

CAD (KiCad official)

Symbol: ATMEGA32A-AU
Footprint: Package_QFP:LQFP-44_10x10mm_P0.8mm
3D model: TQFP-44(10x10) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`atmega32a-au.step`	591 KB	You want the bare part, or you mark your own boards.
`atmega32a-au-etched.step`	3.9 MB	You want the part with `ATMEGA32A-AU` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 997 faces against 695 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Microchip datasheet (18 pp, sha256 683cd3f08e75f0c3, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF