ATMEGA48PB-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, an I/O pin with selectable internal pull-up whose alternate functions are INT1, PCINT19 and OC2B.
2	PD4	bidirectional	Port D bit 4, an I/O pin with selectable internal pull-up whose alternate functions are PCINT20, T0 and XCK.
3	PE0	bidirectional	Port E bit 0, an I/O pin with selectable internal pull-up whose alternate function is ACO (analog comparator output).
4	VCC	power_in	Digital supply voltage.
5	GND	power_in	Ground.
6	PE1	bidirectional	Port E bit 1, a general purpose I/O pin with selectable internal pull-up.
7	PB6	bidirectional	Port B bit 6, an I/O pin that can be input to the inverting oscillator amplifier and internal clock circuit (XTAL1) or TOSC1, with alternate function PCINT6.
8	PB7	bidirectional	Port B bit 7, an I/O pin that can be output from the inverting oscillator amplifier (XTAL2) or TOSC2, with alternate function PCINT7.
9	PD5	bidirectional	Port D bit 5, an I/O pin with selectable internal pull-up whose alternate functions are PCINT21, OC0B and T1.
10	PD6	bidirectional	Port D bit 6, an I/O pin with selectable internal pull-up whose alternate functions are PCINT22, OC0A and AIN0.
11	PD7	bidirectional	Port D bit 7, an I/O pin with selectable internal pull-up whose alternate functions are PCINT23 and AIN1.
12	PB0	bidirectional	Port B bit 0, an I/O pin with selectable internal pull-up whose alternate functions are PCINT0, CLKO and ICP1.
13	PB1	bidirectional	Port B bit 1, an I/O pin with selectable internal pull-up whose alternate functions are PCINT1 and OC1A.
14	PB2	bidirectional	Port B bit 2, an I/O pin with selectable internal pull-up whose alternate functions are PCINT2, OC1B and SPI SS.
15	PB3	bidirectional	Port B bit 3, an I/O pin with selectable internal pull-up whose alternate functions are PCINT3, OC2A and SPI MOSI.
16	PB4	bidirectional	Port B bit 4, an I/O pin with selectable internal pull-up whose alternate functions are PCINT4 and SPI MISO.
17	PB5	bidirectional	Port B bit 5, an I/O pin with selectable internal pull-up whose alternate functions are PCINT5 and SPI SCK.
18	AVCC	power_in	Supply voltage for the A/D converter, PC[3:0] and PE[3:2]; it must be connected to VCC even if the ADC is not used, and through a low-pass filter if the ADC is used.
19	PE2	bidirectional	Port E bit 2, an I/O pin powered from AVCC that also serves as the ADC6 analog input (10-bit ADC channel).
20	AREF	input	Analog reference pin for the A/D converter; an external capacitor on it should be 100nF or larger per the errata.
21	GND	power_in	Ground.
22	PE3	bidirectional	Port E bit 3, an I/O pin powered from AVCC that also serves as the ADC7 analog input (10-bit ADC channel).
23	PC0	bidirectional	Port C bit 0, an I/O pin powered from AVCC whose alternate functions are PCINT8 and ADC0.
24	PC1	bidirectional	Port C bit 1, an I/O pin powered from AVCC whose alternate functions are PCINT9 and ADC1.
25	PC2	bidirectional	Port C bit 2, an I/O pin powered from AVCC whose alternate functions are PCINT10 and ADC2.
26	PC3	bidirectional	Port C bit 3, an I/O pin powered from AVCC whose alternate functions are PCINT11 and ADC3.
27	PC4	bidirectional	Port C bit 4, an I/O pin powered from VCC whose alternate functions are PCINT12, ADC4 and TWI SDA.
28	PC5	bidirectional	Port C bit 5, an I/O pin powered from VCC whose alternate functions are PCINT13, ADC5 and TWI SCL.
29	PC6/RESET	bidirectional	Reset input when the RSTDISBL fuse is unprogrammed, where a low level longer than the minimum pulse length generates a reset; it is an I/O pin with PCINT14 when the fuse is programmed, and its electrical characteristics differ from the other Port C pins.
30	PD0	bidirectional	Port D bit 0, an I/O pin with selectable internal pull-up whose alternate functions are PCINT16 and USART RXD.
31	PD1	bidirectional	Port D bit 1, an I/O pin with selectable internal pull-up whose alternate functions are PCINT17 and USART TXD.
32	PD2	bidirectional	Port D bit 2, an I/O pin with selectable internal pull-up whose alternate functions are 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 voltage	VCC	1.8		5.5	V		2
Operational temperature range (Industrial, AU ordering code)		-40		85	°C	Industrial (-40°C to +85°C) per ordering table for ATmega48PB-AU	7
Maximum operating frequency at 1.8-5.5 V				4	MHz	Speed grade 0 - 4MHz at 1.8-5.5V	2
Maximum operating frequency at 2.7-5.5 V				10	MHz	Speed grade 0 - 10MHz at 2.7-5.5V	2
Maximum operating frequency at 4.5-5.5 V				20	MHz	Speed grade 0 - 20MHz at 4.5-5.5V	2
Active mode current			0.35		mA	Power consumption at 1MHz, 1.8V, 25°C; Active mode	2
Power-down mode current			0.23		μA	Power consumption at 1MHz, 1.8V, 25°C; Power-down mode	2
Power-save mode current				1.4	μA	Power consumption at 1MHz, 1.8V, 25°C; Power-save mode (including 32kHz RTC)	2

CAD (KiCad official)

Symbol: ATMEGA48PB-AU
Footprint: Package_QFP:TQFP-32_7x7mm_P0.8mm
3D model: TQFP-32(7x7) (KiCad packages3D, STEP)
3D model files: atmega48pb-au-etched.step / atmega48pb-au-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega48pb-au.step / atmega48pb-au.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (32 pp, sha256 43913b6d1b8d9ca9, retrieved 2026-11-07, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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

ATMEGA48PB-AU

Verified ATMEGA48PB-AU

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README