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ATMEGA8L-8AU

Microchip Tech · Microcontrollers (MCU/MPU/SOC) · TQFP-32(7x7)

ATMEGA8L-8AU 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 is a bidirectional I/O pin with an internal pull-up resistor (selectable per bit) that is tri-stated when reset is active, and is labelled INT1 on the pinout.
2	PD4	bidirectional	Port D bit 4 is a bidirectional I/O pin with an internal pull-up resistor (selectable per bit) that is tri-stated when reset is active, and is labelled XCK/T0 on the pinout.
3	GND	power_in	Ground reference for the digital supply.
4	VCC	power_in	Digital supply voltage; the operating range for the ATmega8L-8AU is 2.7 V to 5.5 V at up to 8 MHz.
5	GND	power_in	Ground reference for the digital supply.
6	VCC	power_in	Digital supply voltage; the operating range for the ATmega8L-8AU is 2.7 V to 5.5 V at up to 8 MHz.
7	PB6	bidirectional	Port B bit 6 is an I/O pin that, depending on the clock fuse settings, serves as the input to the inverting oscillator amplifier and to the internal clock circuit, and as TOSC1 when the internal RC oscillator is used with AS2 set.
8	PB7	bidirectional	Port B bit 7 is an I/O pin that, depending on the clock fuse settings, serves as the output of the inverting oscillator amplifier, and as TOSC2 when the internal RC oscillator is used with AS2 set.
9	PD5	bidirectional	Port D bit 5 is a bidirectional I/O pin with internal pull-up resistor (selectable per bit), labelled T1 on the pinout; the Port D special-function details are on page 63, not in the provided text.
10	PD6	bidirectional	Port D bit 6 is a bidirectional I/O pin with internal pull-up resistor (selectable per bit), labelled AIN0 (analog comparator positive input) on the pinout.
11	PD7	bidirectional	Port D bit 7 is a bidirectional I/O pin with internal pull-up resistor (selectable per bit), labelled AIN1 (analog comparator negative input) on the pinout.
12	PB0	bidirectional	Port B bit 0 is an 8-bit port bit with internal pull-up resistor (selectable per bit), labelled ICP1 on the pinout; alternate-function details are on page 58, not in the provided text.
13	PB1 (OC1A)	bidirectional	Port B bit 1 is an 8-bit port bit with internal pull-up resistor (selectable per bit), labelled OC1A on the pinout; alternate-function details are on page 58, not in the provided text.
14	PB2 (SS/OC1B)	bidirectional	Port B bit 2 is an 8-bit port bit with internal pull-up resistor (selectable per bit), labelled SS/OC1B on the pinout; alternate-function details are on page 58, not in the provided text.
15	PB3 (MOSI/OC2)	bidirectional	Port B bit 3 is an 8-bit port bit with internal pull-up resistor (selectable per bit), labelled MOSI/OC2 on the pinout; alternate-function details are on page 58, not in the provided text.
16	PB4 (MISO)	bidirectional	Port B bit 4 is an 8-bit port bit with internal pull-up resistor (selectable per bit), labelled MISO on the pinout; alternate-function details are on page 58, not in the provided text.
17	PB5 (SCK)	bidirectional	Port B bit 5 is an 8-bit port bit with internal pull-up resistor (selectable per bit), labelled SCK on the pinout; alternate-function details are on page 58, not in the provided text.
18	AVCC	power_in	Analog supply pin for the ADC; its voltage limits are not stated in the provided text.
19	ADC6	input	ADC6 is an analog input channel of the 8-channel 10-bit ADC, available in the TQFP and QFN/MLF packages.
20	AREF	input	AREF is the ADC analog reference pin; its electrical limits are not stated in the provided text.
21	GND	power_in	Ground reference for the digital supply.
22	ADC7	input	ADC7 is an analog input channel of the 8-channel 10-bit ADC, available in the TQFP and QFN/MLF packages.
23	PC0 (ADC0)	bidirectional	Port C bit 0 is a 7-bit port bit with symmetrical drive and internal pull-up resistor (selectable per bit), labelled ADC0; the pin is tri-stated when reset is active.
24	PC1 (ADC1)	bidirectional	Port C bit 1 is a 7-bit port bit with symmetrical drive and internal pull-up resistor (selectable per bit), labelled ADC1; the pin is tri-stated when reset is active.
25	PC2 (ADC2)	bidirectional	Port C bit 2 is a 7-bit port bit with symmetrical drive and internal pull-up resistor (selectable per bit), labelled ADC2; the pin is tri-stated when reset is active.
26	PC3 (ADC3)	bidirectional	Port C bit 3 is a 7-bit port bit with symmetrical drive and internal pull-up resistor (selectable per bit), labelled ADC3; the pin is tri-stated when reset is active.
27	PC4 (ADC4/SDA)	bidirectional	Port C bit 4 is a 7-bit port bit with symmetrical drive and internal pull-up resistor (selectable per bit), labelled ADC4/SDA; the pin is tri-stated when reset is active.
28	PC5 (ADC5/SCL)	bidirectional	Port C bit 5 is a 7-bit port bit with symmetrical drive and internal pull-up resistor (selectable per bit), labelled ADC5/SCL; the pin is tri-stated when reset is active.
29	PC6 (RESET)	input	If the RSTDISBL fuse is unprogrammed this pin is the Reset input, and a low level longer than the minimum pulse length (Table 15, page 38) generates a reset; if RSTDISBL is programmed it is an I/O pin with electrical characteristics that differ from other Port C pins.
30	PD0 (RXD)	bidirectional	Port D bit 0 is a bidirectional I/O pin with internal pull-up resistor (selectable per bit), labelled RXD (USART receive) on the pinout.
31	PD1 (TXD)	bidirectional	Port D bit 1 is a bidirectional I/O pin with internal pull-up resistor (selectable per bit), labelled TXD (USART transmit) on the pinout.
32	PD2 (INT0)	bidirectional	Port D bit 2 is a bidirectional I/O pin with internal pull-up resistor (selectable per bit), labelled INT0 on the pinout.

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	Min	Max	Unit	Conditions	Page
Power supply voltage (ATmega8L-8AU operating range)	2.7	5.5	V	ATmega8L, 8 MHz speed grade (ordering code ATmega8L-8AU)	6
Speed grade (clock frequency)	0	8	MHz	ATmega8L	1
Operating temperature range (industrial)	-40	85	°C	Industrial operation range, ATmega8L-8AU	6

CAD (KiCad official)

Symbol: ATMEGA8L-8AU
Footprint: Package_QFP:TQFP-32_7x7mm_P0.8mm
3D model: TQFP-32(7x7) (KiCad packages3D, STEP)
3D model files: atmega8l-8au-etched.step / atmega8l-8au-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega8l-8au.step / atmega8l-8au.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (12 pp, sha256 77fb79962ad7d629, retrieved 2026-10-18, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF