AVR128DA28-I from Microchip Tech, in a SOIC-28-300mil. 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	PA7	bidirectional	General-purpose I/O pin PA7 with alternate functions including CLKOUT clock output, USART0 XDIR, SPI0 SS, and TCD0 WOD.
2	PC0	bidirectional	General-purpose I/O pin PC0 with alternate functions including USART1 TxD, SPI1 MOSI, TCA0 WO0 and CCL LUT1 input IN0.
3	PC1	bidirectional	General-purpose I/O pin PC1 with alternate functions including USART1 RxD, SPI1 MISO, TCA0 WO1 and CCL LUT1 input IN1.
4	PC2	bidirectional	General-purpose I/O pin PC2 with alternate functions including USART1 XCK, SPI1 SCK, master TWI SDA, and EVSYS output EVOUTC.
5	PC3	bidirectional	General-purpose I/O pin PC3 with alternate functions including USART1 XDIR, SPI1 SS, master TWI SCL, and TCA0 WO3.
6	PD0	bidirectional	General-purpose I/O pin PD0 that is also ADC0 analog input AIN0, with PTC X16/Y16 and an analog comparator negative input option.
7	PD1	bidirectional	General-purpose I/O pin PD1 that is also ADC0 analog input AIN1, and can serve as the ZCD0 zero-cross input (ZCIN).
8	PD2	bidirectional	General-purpose I/O pin PD2 that is also ADC0 analog input AIN2, with analog comparator positive input option and EVSYS output EVOUTD.
9	PD3	bidirectional	General-purpose I/O pin PD3 that is also ADC0 analog input AIN3, with analog comparator input options and CCL LUT2 output.
10	PD4	bidirectional	General-purpose I/O pin PD4 that is also ADC0 analog input AIN4, with analog comparator positive input option and PTC X20/Y20.
11	PD5	bidirectional	General-purpose I/O pin PD5 that is also ADC0 analog input AIN5, with PTC X21/Y21 and analog comparator negative input option.
12	PD6	bidirectional	General-purpose I/O pin PD6 that is also ADC0 analog input AIN6 and the DAC0 voltage output VOUT.
13	PD7	bidirectional	General-purpose I/O pin PD7 that is also ADC0 analog input AIN7 and the external voltage reference input VREFA.
14	AVDD	power_in	Analog supply pin; AVDD and VDD are internally connected and there are no separate power domains on the AVR DA family.
15	GND	power_in	Ground pin, which must be connected to the same ground as the other GND pins.
16	PF0 (XTAL32K1)	bidirectional	General-purpose I/O pin PF0 that is also the 32 kHz crystal oscillator pin XTAL32K1 and ADC0 positive input-only AIN16.
17	PF1 (XTAL32K2)	bidirectional	General-purpose I/O pin PF1 that is also the 32 kHz crystal oscillator pin XTAL32K2 and ADC0 positive input-only AIN17.
18	PF6 (RESET)	input	Input-only pin PF6 that becomes the active-low external RESET input when the RSTPINCFG fuse selects RESET, otherwise it is a general input.
19	UPDI	bidirectional	Dedicated Unified Program and Debug Interface pin used for one-wire UART programming and debugging, with no other function.
20	VDD	power_in	Digital supply pin for 1.8-5.5 V operation; all VDD pins are internally connected and must be at the same voltage.
21	GND	power_in	Ground pin for the digital supply, which must be connected to the same ground as the other GND pins.
22	PA0 (EXTCLK)	bidirectional	General-purpose I/O pin PA0 that can serve as the external clock input EXTCLK, with alternate functions including USART0 TxD and TCA0 WO0.
23	PA1	bidirectional	General-purpose I/O pin PA1 with alternate functions including USART0 RxD, TCA0 WO1, and CCL LUT0 input IN1.
24	PA2	bidirectional	General-purpose I/O pin PA2 with alternate functions including USART0 XCK, master TWI SDA, TCA0 WO2, and EVSYS output EVOUTA.
25	PA3	bidirectional	General-purpose I/O pin PA3 with alternate functions including USART0 XDIR, master TWI SCL, TCA1 WO3, and CCL LUT0 output.
26	PA4	bidirectional	General-purpose I/O pin PA4 with alternate functions including USART0 TxD, SPI0 MOSI, TCA0 WO4 and TCB0 WOA.
27	PA5	bidirectional	General-purpose I/O pin PA5 with alternate functions including USART0 RxD, SPI0 MISO, TCA0 WO5 and TCB0 WOB.
28	PA6	bidirectional	General-purpose I/O pin PA6 with alternate functions including USART0 XCK, SPI0 SCK, TCB0 WOC and CCL output.

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	SOIC-28-300mil
Category	Embedded Processors & Controllers
Pins	28

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Supply voltage (ordering table, AVR128DA28-I/SO)		1.8		5.5	V	Ordering Information table row for AVR128DA28-I/SO (SOIC 28, tube); printed as 1.8-5.5V	575
Operating temperature range (ordering table, AVR128DA28-I/SO)		-40		85	°C	Ordering Information table row for AVR128DA28-I/SO; printed as -40°C to +85°C (Industrial)	575

CAD (KiCad official)

Symbol: AVR128DA28-I
Footprint: Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm
3D model: SOIC-28-300mil (KiCad packages3D, STEP)
3D model files: avr128da28-i-etched.step / avr128da28-i-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); avr128da28-i.step / avr128da28-i.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (606 pp, sha256 af28f75106de16f2, retrieved 2026-10-30, tier: manufacturer)
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

AVR128DA28-I

Verified AVR128DA28-I

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README