ATSAMD51G18A-MU from Microchip Tech, in a QFN-48-EP(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	PA00	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions A-N via PMUX, including EIC EXTINT[0] and the XOSC32K XIN32 crystal input.
2	PA01	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions A-N via PMUX, including EIC EXTINT[1] and the XOSC32K XOUT32 crystal output.
3	PA02	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[2], ADC0 AIN[0] and DAC VOUT[0]; it is one of the recommended pins for XOSC32K jitter minimization on the 48-pin package.
4	PA03	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[3], ANAREF VREFA, ADC0 AIN[1] and PTC X0/Y0; it is one of the recommended pins for XOSC32K jitter minimization on the 48-pin package.
5	GNDANA	power_in	Analog ground reference pin for the analog peripherals.
6	VDDANA	power_in	Analog supply pin for the analog peripherals; separate voltage limits are not given in the extracted pages.
7	PB08	bidirectional	PORT group B general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[8], ADC0 AIN[2], ADC1 AIN[0] and PTC X1/Y1.
8	PB09	bidirectional	PORT group B general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[9], ADC0 AIN[3], ADC1 AIN[1] and PTC X2/Y2.
9	PA04	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[4], ANAREF VREFB, ADC0 AIN[4], AC AIN[0] and PTC X3/Y3.
10	PA05	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[5], ADC0 AIN[5], AC AIN[1] and DAC VOUT[1].
11	PA06	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[6], ANAREF VREFC, ADC0 AIN[6], AC AIN[2] and PTC X4/Y4.
12	PA07	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[7], ADC0 AIN[7], AC AIN[3] and PTC X5/Y5.
13	PA08	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC NMI, ADC0 AIN[8] and ADC1 AIN[2]; it is a High Sink pin and can be used for SERCOM I2C on VDDIO.
14	PA09	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[9], ADC0 AIN[9] and ADC1 AIN[3]; it is a High Sink pin and can be used for SERCOM I2C on VDDIO.
15	PA10	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[10], ADC0 AIN[10] and QSPI DATA[2].
16	PA11	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[11], ADC0 AIN[11], PTC X9/Y9 and QSPI DATA[3].
17	VDDIO	power_in	I/O supply pin for the GPIO clusters it powers; the device operating range is 1.71 V to 3.63 V.
18	GND	power_in	Ground reference pin for the device digital I/O and core.
19	PB10	bidirectional	PORT group B general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[10], QSPI SCK and I2S SDI.
20	PB11	bidirectional	PORT group B general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[11], QSPI CS and I2S FS[1].
21	PA12	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX; it is a High Sink pin and can be used for SERCOM I2C on VDDIO.
22	PA13	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX; it is a High Sink pin and can be used for SERCOM I2C on VDDIO.
23	PA14	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX; it is the XOSC0 XIN oscillator input.
24	PA15	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX; it is the XOSC0 XOUT oscillator output.
25	PA16	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX; it is a High Sink pin and can be used for SERCOM I2C on VDDIO.
26	PA17	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX; it is a High Sink pin and can be used for SERCOM I2C on VDDIO.
27	PA18	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX.
28	PA19	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX.
29	PA20	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[4] and PTC X14/Y14.
30	PA21	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[5] and PTC X15/Y15.
31	PA22	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[6] and PTC X16/Y16; it is a High Sink pin and can be used for SERCOM I2C on VDDIO.
32	PA23	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[7], PTC X17/Y17 and USB SOF 1kHz; it is a High Sink pin and can be used for SERCOM I2C on VDDIO.
33	PA24	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[8] and USB DM.
34	PA25	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[9] and USB DP.
35	GND	power_in	Ground reference pin for the device digital I/O and core.
36	VDDIO	power_in	I/O supply pin for the GPIO clusters it powers; the device operating range is 1.71 V to 3.63 V.
37	PB22	bidirectional	PORT group B general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[6], USB SOF 1kHz and the XOSC1 XIN oscillator input.
38	PB23	bidirectional	PORT group B general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[7] and the XOSC1 XOUT oscillator output.
39	PA27	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[11] and GCLK IO[1].
40	RESETN	input	Active-low external reset input (digital, active low) for the device.
41	VDDCORE	power_in	Core supply pin for the device internal logic, associated with the embedded buck/LDO regulator; its exact role and limits are not stated in the extracted pages.
42	GND	power_in	Ground reference pin for the device digital I/O and core.
43	VSW	passive	Switch node of the embedded buck/LDO regulator; its external connection details are not in the extracted pages.
44	VDDIO	power_in	I/O supply pin for the GPIO clusters it powers; the device operating range is 1.71 V to 3.63 V.
45	PA30	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[14] and the SWCLK serial-wire debug clock.
46	PA31	bidirectional	PORT group A general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[15] and the SWDIO serial-wire debug data line.
47	PB02	bidirectional	PORT group B general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[2], ADC0 AIN[14] and PTC X20/Y20; it is one of the recommended pins for XOSC32K jitter minimization on the 48-pin package.
48	PB03	bidirectional	PORT group B general-purpose I/O that can be assigned to peripheral functions via PMUX, including EIC EXTINT[3], ADC0 AIN[15] and PTC X21/Y21; it is one of the recommended pins for XOSC32K jitter minimization on the 48-pin package.
49	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	QFN-48-EP(7x7)
Category	Embedded Processors & Controllers
Pins	49

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 supply voltage VDD (VDDIO and VDDANA), -40°C to +85°C, DC to 120 MHz	VDD	1.71		3.63	V	-40°C to +85°C, DC to 120 MHz	1
Operating ambient temperature range (Industrial, -MU grade)		-40		85	°C	1.71V to 3.63V, DC to 120 MHz	1
Maximum operating frequency				120	MHz	1.71V to 3.63V, -40°C to +85°C	1
VDDIO supply voltage (powers I/O lines, XOSCn and VDDCORE regulator)	VDDIO	1.71		3.63	V		46
VDDIOB supply voltage (powers I/O B lines)	VDDIOB	1.71		3.63	V	VDDIOB must be equal to or lower than VDDIO	46
VDDANA supply voltage (I/O, ADC0/1, AC, DAC, PTC)	VDDANA	1.71		3.63	V	Same voltage as VDDIO (common VDD)	46
VBAT supply voltage (Automatic Power Switch)	VBAT	1.71		3.63	V		46
VDDCORE internal regulator output voltage	VDDCORE		1.2		V	Internal regulator output (typical)	46

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part	Material	Colour / plating	Datasheet says	Page
housing	pet		nu1RBase nu1 I Crypto RAM u2RLength Base of R Base of R value filled repetitively with u4FillValue	1316
contacts		tin	including indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. In the Self Capacitance mode, the PTC requires only one pin (Y-line) for each touch sensor.	1697

CAD (KiCad official)

Symbol: ATSAMD51G18A-MU
Footprint: Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.15x5.15mm
3D model: QFN-48-EP(7x7) (KiCad packages3D, STEP)
3D model files: atsamd51g18a-mu-etched.step / atsamd51g18a-mu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamd51g18a-mu.step / atsamd51g18a-mu.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (1934 pp, sha256 6f02ccc3e69325ab, 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

ATSAMD51G18A-MU

Verified ATSAMD51G18A-MU

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README