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ATMEGA168A-AU
Public Made by Adomby adom
Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), TQFP-32(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownATMEGA168A-AU
Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · TQFP-32(7x7)
ATMEGA168A-AU from Microchip Tech, in a TQFP-32(7x7). 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 | PD3 | bidirectional | Port D bit 3 bi-directional I/O with internal pull-up, alternate functions INT1, OC2B and PCINT19. |
| 2 | PD4 | bidirectional | Port D bit 4 bi-directional I/O with internal pull-up, alternate functions XCK, T0 and PCINT20. |
| 3 | GND | power_in | Ground. |
| 4 | VCC | power_in | Digital supply voltage. |
| 5 | GND | power_in | Ground. |
| 6 | VCC | power_in | Digital supply voltage. |
| 7 | PB6 | bidirectional | Port B bit 6 I/O that, depending on clock fuse settings, is the inverting oscillator amplifier input (XTAL1/TOSC1), with PCINT6. |
| 8 | PB7 | bidirectional | Port B bit 7 I/O that, depending on clock fuse settings, is the inverting oscillator amplifier output (XTAL2/TOSC2), with PCINT7. |
| 9 | PD5 | bidirectional | Port D bit 5 bi-directional I/O with internal pull-up, alternate functions T1, OC0B and PCINT21. |
| 10 | PD6 | bidirectional | Port D bit 6 bi-directional I/O with internal pull-up, alternate functions AIN0 (comparator positive input), OC0A and PCINT22. |
| 11 | PD7 | bidirectional | Port D bit 7 bi-directional I/O with internal pull-up, alternate functions AIN1 (comparator negative input) and PCINT23. |
| 12 | PB0 | bidirectional | Port B bit 0 bi-directional I/O with internal pull-up, alternate functions ICP1, CLKO (divided system clock output) and PCINT0. |
| 13 | PB1 | bidirectional | Port B bit 1 bi-directional I/O with internal pull-up, alternate functions OC1A and PCINT1. |
| 14 | PB2 | bidirectional | Port B bit 2 bi-directional I/O with internal pull-up, alternate functions SS (SPI slave select), OC1B and PCINT2. |
| 15 | PB3 | bidirectional | Port B bit 3 bi-directional I/O with internal pull-up, alternate functions MOSI, OC2A and PCINT3. |
| 16 | PB4 | bidirectional | Port B bit 4 bi-directional I/O with internal pull-up, alternate functions MISO and PCINT4. |
| 17 | PB5 | bidirectional | Port B bit 5 bi-directional I/O with internal pull-up, alternate functions SCK (SPI clock) and PCINT5. |
| 18 | AVCC | power_in | Supply voltage for the A/D converter, PC3:0 and ADC7:6, to be connected externally to VCC even if the ADC is unused, via a low-pass filter if the ADC is used. |
| 19 | ADC6 | input | Analog input channel 6 of the 10-bit A/D converter (TQFP/VQFN only), powered from the analog supply. |
| 20 | AREF | input | Analog reference pin for the A/D converter. |
| 21 | GND | power_in | Ground. |
| 22 | ADC7 | input | Analog input channel 7 of the 10-bit A/D converter (TQFP/VQFN only), powered from the analog supply. |
| 23 | PC0 | bidirectional | Port C bit 0 bi-directional I/O with internal pull-up, alternate functions ADC0 (analog power) and PCINT8. |
| 24 | PC1 | bidirectional | Port C bit 1 bi-directional I/O with internal pull-up, alternate functions ADC1 (analog power) and PCINT9. |
| 25 | PC2 | bidirectional | Port C bit 2 bi-directional I/O with internal pull-up, alternate functions ADC2 (analog power) and PCINT10. |
| 26 | PC3 | bidirectional | Port C bit 3 bi-directional I/O with internal pull-up, alternate functions ADC3 (analog power) and PCINT11. |
| 27 | PC4 | bidirectional | Port C bit 4 bi-directional I/O with internal pull-up, alternate functions ADC4, SDA (2-wire data, 50 ns spike filter) and PCINT12, using digital supply VCC. |
| 28 | PC5 | bidirectional | Port C bit 5 bi-directional I/O with internal pull-up, alternate functions ADC5, SCL (2-wire clock, 50 ns spike filter) and PCINT13, using digital supply VCC. |
| 29 | PC6/RESET | input | Reset input when RSTDISBL fuse is unprogrammed (low level longer than the minimum pulse length generates a reset), otherwise an I/O pin with electrical characteristics differing from other Port C pins. |
| 30 | PD0 | bidirectional | Port D bit 0 bi-directional I/O with internal pull-up, alternate functions RXD (USART input) and PCINT16. |
| 31 | PD1 | bidirectional | Port D bit 1 bi-directional I/O with internal pull-up, alternate functions TXD (USART output) and PCINT17. |
| 32 | PD2 | bidirectional | Port D bit 2 bi-directional I/O with internal pull-up, alternate functions INT0 and PCINT18. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TQFP-32(7x7) |
| Category | Embedded Processors & Controllers |
| Pins | 32 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating Temperature (absolute maximum) | -55 | 125 | °C | Absolute Maximum Ratings | 308 | ||
| Storage Temperature | -65 | 150 | °C | Absolute Maximum Ratings | 308 | ||
| Voltage on any Pin except RESET with respect to Ground | -0.5 | V | Printed as -0.5V to VCC+0.5V | 308 | |||
| Voltage on RESET with respect to Ground | -0.5 | 13 | V | Absolute Maximum Ratings | 308 | ||
| DC Current per I/O Pin | 40 | mA | Absolute Maximum Ratings | 308 | |||
| DC Current VCC and GND Pins | 200 | mA | Absolute Maximum Ratings | 308 | |||
| Supply Voltage | VCC | 1.8 | 5.5 | V | TA = -40°C to 85°C; ATmega168A-AU, 20 MHz speed grade | 632 | |
| Operating Temperature (Industrial) | TA | -40 | 85 | °C | Industrial, ATmega168A-AU | 632 | |
| Maximum Frequency at VCC = 1.8V | 4 | MHz | Speed grade figure 29-1, VCC = 1.8V | 312 | |||
| Maximum Frequency at VCC = 2.7V | 10 | MHz | Speed grade figure 29-1, VCC = 2.7V | 312 | |||
| Maximum Frequency at VCC = 4.5V to 5.5V | 20 | MHz | Speed grade figure 29-1, VCC = 4.5V | 312 |
CAD (KiCad official)
- Symbol:
ATMEGA168A-AU - Footprint:
Package_QFP:TQFP-32_7x7mm_P0.8mm - 3D model: TQFP-32(7x7) (KiCad packages3D, STEP)
- 3D model files:
atmega168a-au-etched.step/atmega168a-au-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);atmega168a-au.step/atmega168a-au.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (653 pp, sha256
b9b9d83cda56a95d, retrieved 2026-10-26, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-sonnet-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).