ATSAMD21E17A-MUT from Microchip Tech, in a QFN-32-EP(5x5). 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 in the VDDANA domain, also multiplexed to the 32 kHz crystal input XIN32, EXTINT[0], SERCOM1/PAD[0] and TCC2/WO[0].
2	PA01	bidirectional	PORT group A general-purpose I/O in the VDDANA domain, also multiplexed to the 32 kHz crystal output XOUT32, EXTINT[1], SERCOM1/PAD[1] and TCC2/WO[1].
3	PA02	bidirectional	PORT group A general-purpose I/O in the VDDANA domain, also usable as analog input AIN[0] and DAC output VOUT, with EXTINT[2] and TCC3/WO[0].
4	PA03	bidirectional	PORT group A general-purpose I/O in the VDDANA domain, also usable as analog input AIN[1] and ADC/DAC voltage reference VREFA, with EXTINT[3] and TCC3/WO[1].
5	PA04	bidirectional	PORT group A general-purpose I/O in the VDDANA domain, also usable as analog input AIN[4] and AIN[0] and ADC reference VREFB, with EXTINT[4], SERCOM0/PAD[0] and TCC0/WO[0].
6	PA05	bidirectional	PORT group A general-purpose I/O in the VDDANA domain, also usable as analog input AIN[5] and AIN[1], with EXTINT[5], SERCOM0/PAD[1] and TCC0/WO[1].
7	PA06	bidirectional	PORT group A general-purpose I/O in the VDDANA domain, also usable as analog input AIN[6] and AIN[2], with EXTINT[6], SERCOM0/PAD[2] and TCC1/WO[0].
8	PA07	bidirectional	PORT group A general-purpose I/O in the VDDANA domain, also usable as analog input AIN[7] and AIN[3], with EXTINT[7], SERCOM0/PAD[3] and TCC1/WO[1].
9	VDDANA	power_in	Analog supply pin for the analog peripherals, referenced to GND at pin 10.
10	GND	power_in	Ground pin for the digital and I/O domain.
11	PA08	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to NMI, AIN[16], SERCOM0/PAD[0], SERCOM2/PAD[0] and TCC0/WO[0].
12	PA09	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[9], AIN[17], SERCOM0/PAD[1], SERCOM2/PAD[1] and TCC0/WO[1].
13	PA10	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[10], AIN[18], SERCOM0/PAD[2], SERCOM2/PAD[2] and TCC1/WO[0].
14	PA11	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[11], AIN[19], SERCOM0/PAD[3], SERCOM2/PAD[3] and TCC1/WO[1].
15	PA14	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to the crystal input XIN for XOSC, EXTINT[14], SERCOM2/PAD[2] and TC3/WO[0].
16	PA15	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to the crystal output XOUT for XOSC, EXTINT[15], SERCOM2/PAD[3] and TC3/WO[1].
17	PA16	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[0], X[4], SERCOM1/PAD[0], SERCOM3/PAD[0] and TCC2/WO[0].
18	PA17	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[1], X[5], SERCOM1/PAD[1], SERCOM3/PAD[1] and TCC2/WO[1].
19	PA18	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[2], X[6], SERCOM1/PAD[2], SERCOM3/PAD[2], TC3/WO[0] and AC/CMP[0].
20	PA19	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[3], X[7], SERCOM1/PAD[3], SERCOM3/PAD[3], TC3/WO[1] and AC/CMP[1].
21	PA22	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[6], X[10], SERCOM3/PAD[0], SERCOM5/PAD[0], TC4/WO[0] and TCC0/WO[4].
22	PA23	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[7], X[11], SERCOM3/PAD[1], SERCOM5/PAD[1], TC4/WO[1] and USB/SOF 1kHz.
23	PA24	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[12], SERCOM3/PAD[2], SERCOM5/PAD[2], TC5/WO[0] and USB DM; no drive-strength option is available on this pin.
24	PA25	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[13], SERCOM3/PAD[3], SERCOM5/PAD[3], TC5/WO[1] and USB DP; no drive-strength option is available on this pin.
25	PA27	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[15], TCC3/WO[6] and GCLK_IO[0].
26	RESET	input	External active-low reset input pin of the device.
27	PA28	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to EXTINT[8], TCC3/WO[7] and GCLK_IO[0].
28	GND	power_in	Ground pin for the digital core and I/O domain.
29	VDDCORE	power_out	Regulated output of the internal voltage regulator that supplies the core logic.
30	VDDIN	power_in	Input supply pin for the internal voltage regulator and I/O domain.
31	PA30	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to the SWD clock SWCLK, EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0] and TCC3/WO[4].
32	PA31	bidirectional	PORT group A general-purpose I/O in the VDDIO domain, also multiplexed to the SWD data pin SWDIO (active only with a debugger present), EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1] and TCC3/WO[5].
33	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	QFN-32-EP(5x5)
Category	Embedded Processors & Controllers
Pins	33

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 (VDDIO, VDDIN, VDDANA common supply)	VDD	1.62		3.63	V	SAM D21 variant; same voltage applied to VDDIN, VDDIO and VDDANA	2

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
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.	859

CAD (KiCad official)

Symbol: ATSAMD21E17A-MUT
Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
3D model: QFN-32-EP(5x5) (KiCad packages3D, STEP)
3D model files: atsamd21e17a-mut-etched.step / atsamd21e17a-mut-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamd21e17a-mut.step / atsamd21e17a-mut.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (1148 pp, sha256 18ca1ccab5aa330f, retrieved 2026-11-02, 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

ATSAMD21E17A-MUT

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3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

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