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ATSAMD21G18A-AU

Microchip Tech · Microcontrollers (MCU/MPU/SOC) · TQFP-48(7x7)

ATSAMD21G18A-AU from Microchip Tech, in a TQFP-48(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 A digital I/O line PA00; this summary gives only the pin name and no electrical limits for it.
2	PA01	bidirectional	Port A digital I/O line PA01; this summary gives only the pin name and no electrical limits for it.
3	PA02	bidirectional	Port A digital I/O line PA02; this summary gives only the pin name and no electrical limits for it.
4	PA03	bidirectional	Port A digital I/O line PA03; this summary gives only the pin name and no electrical limits for it.
5	GNDANA	power_in	Ground for the analog circuitry; this summary gives no voltage limits for it.
6	VDDANA	power_in	Supply for the analog circuitry; this summary gives no voltage limits for it.
7	PB08	bidirectional	Port B digital I/O line PB08; this summary gives only the pin name and no electrical limits for it.
8	PB09	bidirectional	Port B digital I/O line PB09; this summary gives only the pin name and no electrical limits for it.
9	PA04	bidirectional	Port A digital I/O line PA04; this summary gives only the pin name and no electrical limits for it.
10	PA05	bidirectional	Port A digital I/O line PA05; this summary gives only the pin name and no electrical limits for it.
11	PA06	bidirectional	Port A digital I/O line PA06; this summary gives only the pin name and no electrical limits for it.
12	PA07	bidirectional	Port A digital I/O line PA07; this summary gives only the pin name and no electrical limits for it.
13	PA08	bidirectional	Port A digital I/O line PA08; this summary gives only the pin name and no electrical limits for it.
14	PA09	bidirectional	Port A digital I/O line PA09; this summary gives only the pin name and no electrical limits for it.
15	PA10	bidirectional	Port A digital I/O line PA10; this summary gives only the pin name and no electrical limits for it.
16	PA11	bidirectional	Port A digital I/O line PA11; this summary gives only the pin name and no electrical limits for it.
17	VDDIO	power_in	I/O supply for the digital pins; this summary gives no voltage limits for it.
18	GND	power_in	Digital ground.
19	PB10	bidirectional	Port B digital I/O line PB10; this summary gives only the pin name and no electrical limits for it.
20	PB11	bidirectional	Port B digital I/O line PB11; this summary gives only the pin name and no electrical limits for it.
21	PA12	bidirectional	Port A digital I/O line PA12; this summary gives only the pin name and no electrical limits for it.
22	PA13	bidirectional	Port A digital I/O line PA13; this summary gives only the pin name and no electrical limits for it.
23	PA14	bidirectional	Port A digital I/O line PA14; this summary gives only the pin name and no electrical limits for it.
24	PA15	bidirectional	Port A digital I/O line PA15; this summary gives only the pin name and no electrical limits for it.
25	PA16	bidirectional	Port A digital I/O line PA16; this summary gives only the pin name and no electrical limits for it.
26	PA17	bidirectional	Port A digital I/O line PA17; this summary gives only the pin name and no electrical limits for it.
27	PA18	bidirectional	Port A digital I/O line PA18; this summary gives only the pin name and no electrical limits for it.
28	PA19	bidirectional	Port A digital I/O line PA19; this summary gives only the pin name and no electrical limits for it.
29	PA20	bidirectional	Port A digital I/O line PA20; this summary gives only the pin name and no electrical limits for it.
30	PA21	bidirectional	Port A digital I/O line PA21; the name is taken from a stray label on the page because the printed pin 30 label is missing in the extracted text.
31	PA22	bidirectional	Port A digital I/O line PA22; this summary gives only the pin name and no electrical limits for it.
32	PA23	bidirectional	Port A digital I/O line PA23; this summary gives only the pin name and no electrical limits for it.
33	PA24	bidirectional	Port A digital I/O line PA24; this summary gives only the pin name and no electrical limits for it.
34	PA25	bidirectional	Port A digital I/O line PA25; this summary gives only the pin name and no electrical limits for it.
35	GND	power_in	Digital ground.
36	VDDIO	power_in	I/O supply for the digital pins; this summary gives no voltage limits for it.
37	PB22	bidirectional	Port B digital I/O line PB22; this summary gives only the pin name and no electrical limits for it.
38	PB23	bidirectional	Port B digital I/O line PB23; this summary gives only the pin name and no electrical limits for it.
39	PA27	bidirectional	Port A digital I/O line PA27; this summary gives only the pin name and no electrical limits for it.
40	RESET	input	Reset pin of the device; this summary gives no polarity or electrical limits for it.
41	PA28	bidirectional	Port A digital I/O line PA28; this summary gives only the pin name and no electrical limits for it.
42	GND	power_in	Digital ground.
43	VDDCORE	power_out	Core supply pin, which the legend marks as a regulated output supply; this summary gives no voltage limits for it.
44	VDDIN	power_in	Input supply pin for the device; this summary gives no voltage limits for it.
45	PA30	bidirectional	Port A digital I/O line PA30; this summary gives only the pin name and no electrical limits for it.
46	PA31	bidirectional	Port A digital I/O line PA31; this summary gives only the pin name and no electrical limits for it.
47	PB02	bidirectional	Port B digital I/O line PB02; this summary gives only the pin name and no electrical limits for it.
48	PB03	bidirectional	Port B digital I/O line PB03; this summary gives only the pin name and no electrical limits for it.

Key specifications

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

CAD (KiCad official)

Symbol: ATSAMD21G18A-AU
Footprint: Package_QFP:TQFP-48_7x7mm_P0.5mm
3D model: TQFP-48(7x7) (KiCad packages3D, STEP)
3D model files: atsamd21g18a-au-etched.step / atsamd21g18a-au-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamd21g18a-au.step / atsamd21g18a-au.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (60 pp, sha256 786b60951d0bb37e, retrieved 2026-10-09, 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