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ATMEGA164A-AU

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Microchip Tech Microcontrollers (MCU/MPU/SOC), TQFP-44(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ATMEGA164A-AU

Microchip Tech · Microcontrollers (MCU/MPU/SOC) · TQFP-44(10x10)

ATMEGA164A-AU from Microchip Tech, in a TQFP-44(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 PB5 bidirectional Port B bit 5 I/O with internal pull-up; alternate functions MOSI, ICP3, PCINT13.
2 PB6 bidirectional Port B bit 6 I/O with internal pull-up; alternate functions MISO, OC3A, PCINT14.
3 PB7 bidirectional Port B bit 7 I/O with internal pull-up; alternate functions SCK, OC3B, PCINT15.
4 RESET input Active-low reset input; a low level longer than the minimum pulse length generates a reset even if the clock is not running.
5 VCC power_in Digital supply voltage.
6 GND power_in Ground.
7 XTAL2 output Output from the inverting oscillator amplifier.
8 XTAL1 input Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
9 PD0 bidirectional Port D bit 0 I/O with internal pull-up; alternate functions RXD0, PCINT24 (T3 only on ATmega1284/1284P).
10 PD1 bidirectional Port D bit 1 I/O with internal pull-up; alternate functions TXD0, PCINT25.
11 PD2 bidirectional Port D bit 2 I/O with internal pull-up; alternate functions RXD1, INT0, PCINT26.
12 PD3 bidirectional Port D bit 3 I/O with internal pull-up; alternate functions TXD1, INT1, PCINT27.
13 PD4 bidirectional Port D bit 4 I/O with internal pull-up; alternate functions XCK1, OC1B, PCINT28.
14 PD5 bidirectional Port D bit 5 I/O with internal pull-up; alternate functions OC1A, PCINT29.
15 PD6 bidirectional Port D bit 6 I/O with internal pull-up; alternate functions OC2B, ICP1, PCINT30.
16 PD7 bidirectional Port D bit 7 I/O with internal pull-up; alternate functions OC2A, PCINT31.
17 VCC power_in Digital supply voltage.
18 GND power_in Ground.
19 PC0 bidirectional Port C bit 0 I/O with internal pull-up; alternate functions SCL (TWI), PCINT16.
20 PC1 bidirectional Port C bit 1 I/O with internal pull-up; alternate functions SDA (TWI), PCINT17.
21 PC2 bidirectional Port C bit 2 I/O with internal pull-up; alternate functions TCK (JTAG), PCINT18.
22 PC3 bidirectional Port C bit 3 I/O with internal pull-up; alternate functions TMS (JTAG), PCINT19.
23 PC4 bidirectional Port C bit 4 I/O with internal pull-up; alternate functions TDO (JTAG), PCINT20.
24 PC5 bidirectional Port C bit 5 I/O with internal pull-up; alternate functions TDI (JTAG), PCINT21.
25 PC6 bidirectional Port C bit 6 I/O with internal pull-up; alternate functions TOSC1 (Timer/Counter2 oscillator), PCINT22.
26 PC7 bidirectional Port C bit 7 I/O with internal pull-up; alternate functions TOSC2 (Timer/Counter2 oscillator), PCINT23.
27 AVCC power_in Supply voltage for Port A and the ADC; must be connected to VCC even if the ADC is unused, through a low-pass filter if the ADC is used.
28 GND power_in Ground.
29 AREF input Analog reference pin for the analog-to-digital converter.
30 PA7 bidirectional Port A bit 7 I/O with internal pull-up; ADC7 analog input, PCINT7.
31 PA6 bidirectional Port A bit 6 I/O with internal pull-up; ADC6 analog input, PCINT6.
32 PA5 bidirectional Port A bit 5 I/O with internal pull-up; ADC5 analog input, PCINT5.
33 PA4 bidirectional Port A bit 4 I/O with internal pull-up; ADC4 analog input, PCINT4.
34 PA3 bidirectional Port A bit 3 I/O with internal pull-up; ADC3 analog input, PCINT3.
35 PA2 bidirectional Port A bit 2 I/O with internal pull-up; ADC2 analog input, PCINT2.
36 PA1 bidirectional Port A bit 1 I/O with internal pull-up; ADC1 analog input, PCINT1.
37 PA0 bidirectional Port A bit 0 I/O with internal pull-up; ADC0 analog input, PCINT0.
38 VCC power_in Digital supply voltage.
39 GND power_in Ground.
40 PB0 bidirectional Port B bit 0 I/O with internal pull-up; alternate functions XCK0, T0, PCINT8.
41 PB1 bidirectional Port B bit 1 I/O with internal pull-up; alternate functions CLKO, T1, PCINT9.
42 PB2 bidirectional Port B bit 2 I/O with internal pull-up; alternate functions AIN0, INT2, PCINT10.
43 PB3 bidirectional Port B bit 3 I/O with internal pull-up; alternate functions AIN1, OC0A, PCINT11.
44 PB4 bidirectional Port B bit 4 I/O with internal pull-up; alternate functions SS, OC0B, PCINT12.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package TQFP-44(10x10)
Category Embedded Processors & Controllers
Pins 44

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Input Low Voltage, except XTAL1 and RESET pin VIL -0.5 V VCC = 1.8V - 2.4V 326
Input Low Voltage, XTAL1 pin VIL1 -0.5 V VCC = 1.8V - 5.5V 326
Input Low Voltage, RESET pin VIL2 -0.5 V VCC = 1.8V - 5.5V 326
Output Low Voltage VOL 0.9 V IOL = 20mA, VCC = 5V 326
Output Low Voltage VOL 0.6 V IOL = 10mA, VCC = 3V 326
Output High Voltage VOH 4.2 V IOH = -20mA, VCC = 5V 326
Output High Voltage VOH 2.3 V IOH = -10mA, VCC = 3V 326
Input Leakage Current I/O Pin (absolute value) IIL 1 µA VCC = 5.5V, pin low 326
Reset Pull-up Resistor RRST 30 60 kΩ 326
I/O Pin Pull-up Resistor RPU 20 50 kΩ 326
Analog Comparator Input Offset Voltage VACIO 40 mV VCC = 5V, Vin = VCC/2 326
Analog Comparator Input Offset Voltage VACIO 60 mV VCC < 3.6V, Vin < 0.5V 327
Analog Comparator Input Offset Voltage VACIO 500 mV VCC > 3.6V, Vin < 0.5V 327
Analog Comparator Input Leakage Current IACLK -50 50 nA VCC = 5V, Vin = VCC/2 327
Analog Comparator Propagation Delay tACID 750 ns VCC = 2.7V 327
Analog Comparator Propagation Delay tACID 500 ns VCC = 4.0V 327
Power Supply Current, Active mode ICC 0.3 0.55 mA Active 1MHz, VCC = 2V 328
Power Supply Current, Active mode ICC 1.4 3.5 mA Active 4MHz, VCC = 3V 328
Power Supply Current, Active mode ICC 4.8 12 mA Active 8MHz, VCC = 5V 328
Power Supply Current, Idle mode ICC 0.07 0.5 mA Idle 1MHz, VCC = 2V 328
Power Supply Current, Idle mode ICC 0.25 1.5 mA Idle 4MHz, VCC = 3V 328
Power Supply Current, Idle mode ICC 1 5.5 mA Idle 8MHz, VCC = 5V 328
Power Supply Current, Power-down mode ICC 5 15 µA Power-down mode, WDT enabled, VCC = 3V 328
Power Supply Current, Power-down mode ICC 0.17 3 µA Power-down mode, WDT disabled, VCC = 3V 328
Power Supply Current, Power-save mode ICC 0.5 µA Power-save mode, 32kHz TOSC enabled, VCC = 1.8V 328
Power Supply Current, Power-save mode ICC 0.6 µA Power-save mode, 32kHz TOSC enabled, VCC = 3V 328
Operating temperature -55 125 °C 326
Storage temperature -65 150 °C 326
Voltage on any pin except RESET with respect to ground -0.5 V 326
Voltage on RESET with respect to ground -0.5 13 V 326
DC current per I/O pin 40 mA 326
Operating supply voltage VCC 1.8 5.5 V TA = -40°C to 85°C 326
Operating temperature range TA -40 85 °C 326

CAD (KiCad official)

  • Symbol: ATMEGA164A-AU
  • Footprint: Package_QFP:TQFP-44_10x10mm_P0.8mm
  • 3D model: TQFP-44(10x10) (KiCad packages3D, STEP)
  • 3D model files: atmega164a-au-etched.step / atmega164a-au-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega164a-au.step / atmega164a-au.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (672 pp, sha256 b5ee49362803dc70, retrieved 2026-10-21, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF