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ATSAML21J18B-MUT

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Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), QFN-64-EP(9x9). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentsingle chip microcomputer-microcontrolleratsaml21j18b-mutfactory-2.0.0extractor-text

Verified ATSAML21J18B-MUT

by Ray · last 31 Oct 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

31 Oct 2026RayPublished by the parts factory: tier mfr, 65 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATSAML21J18B-MUT · QFN-64-EP(9x9) · 65 pins
  • ✓copper: 65 copper pads, none touching another net
  • ✓datasheet: all 65 pin names found in the 1158-page datasheet
  • ✓distributor: lcsc C2053754, digikey ATSAML21J18B-MUTTR-ND, mouser 556-ATSAML21J18B-MUT
  • ✓family: QFN-64-1EP_9x9mm_P0.5mm_EP6x6mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-qsqa0k5o/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 65 pins = 65 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 65 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ atsaml21j18b-mut.kicad_sym✓ atsaml21j18b-mut.kicad_mod✓ atsaml21j18b-mut.step
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3D Model

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Symbol & Footprint

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Contents

README

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ATSAML21J18B-MUT

Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · QFN-64-EP(9x9)

ATSAML21J18B-MUT from Microchip Tech, in a QFN-64-EP(9x9). 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 general-purpose I/O with EXTINT[0]/EXTWAKE[0] and multiplexed peripheral functions; it is a backup-domain pin and doubles as XIN32 when the 32 kHz oscillator is used.
2 PA01 bidirectional Port A general-purpose I/O with EXTINT[1]/EXTWAKE[1] and multiplexed peripheral functions; it is a backup-domain pin and doubles as XOUT32 when the 32 kHz oscillator is used.
3 PA02 bidirectional Port A general-purpose I/O with EXTINT[2] and analog input AIN[0]/Y[0]/VOUT[0]; analog function is selected via peripheral function B.
4 PA03 bidirectional Port A general-purpose I/O with EXTINT[3] and analog input AIN[1]/Y[1]/VREFA; analog function is selected via peripheral function B.
5 PB04 bidirectional Port B general-purpose I/O with EXTINT[4] and analog inputs AIN[12]/Y[10]; supplied from VDDANA.
6 PB05 bidirectional Port B general-purpose I/O with EXTINT[5] and analog inputs AIN[13]/Y[11]/OA_NEG[1]; supplied from VDDANA.
7 GNDANA power_in Ground for the analog power domain.
8 VDDANA power_in Analog supply voltage of 1.6 V to 3.6 V (per the power connection table).
9 PB06 bidirectional Port B general-purpose I/O with EXTINT[6] and analog inputs AIN[14]/Y[12]/OA_NEG[2]; supplied from VDDANA.
10 PB07 bidirectional Port B general-purpose I/O with EXTINT[7] and analog inputs AIN[15]/Y[13]; supplied from VDDANA.
11 PB08 bidirectional Port B general-purpose I/O with EXTINT[8], analog input AIN[2] and OA_OUT[1]; supplied from VDDANA.
12 PB09 bidirectional Port B general-purpose I/O with EXTINT[9], analog input AIN[3] and Y[15]/OA_POS[1]; supplied from VDDANA.
13 PA04 bidirectional Port A general-purpose I/O with EXTINT[4]/EXTWAKE[4] and analog inputs AIN[4]/AIN[0]/VREFB; supplied from VDDANA.
14 PA05 bidirectional Port A general-purpose I/O with EXTINT[5]/EXTWAKE[5] and analog inputs AIN[5]/AIN[1]/VOUT[1]; supplied from VDDANA.
15 PA06 bidirectional Port A general-purpose I/O with EXTINT[6]/EXTWAKE[6] and analog inputs AIN[6]/AIN[2]/Y[4]; supplied from VDDANA.
16 PA07 bidirectional Port A general-purpose I/O with EXTINT[7]/EXTWAKE[7] and analog inputs AIN[7]/AIN[3]/OA_OUT[0]; supplied from VDDANA.
17 PA08 bidirectional Port A general-purpose I/O with NMI, analog input AIN[16]/X[0]/Y[6], and SERCOM I2C-capable pad; a High Sink pin per the electrical characteristics, supplied from VDDIO.
18 PA09 bidirectional Port A general-purpose I/O with EXTINT[9], analog input AIN[17]/X[1]/Y[7], and SERCOM I2C-capable pad; a High Sink pin, supplied from VDDIO.
19 PA10 bidirectional Port A general-purpose I/O with EXTINT[10], analog input AIN[18]/X[2]/Y[8] and multiplexed peripheral functions; supplied from VDDIO.
20 PA11 bidirectional Port A general-purpose I/O with EXTINT[11], analog input AIN[19]/X[3]/Y[9] and multiplexed peripheral functions; supplied from VDDIO.
21 VDDIO power_in Digital I/O supply voltage of 1.6 V to 3.6 V.
22 GND power_in Ground for the digital domain.
23 PB10 bidirectional Port B general-purpose I/O with EXTINT[10], Y[2] and multiplexed peripheral functions; supplied from VDDIO.
24 PB11 bidirectional Port B general-purpose I/O with EXTINT[11], Y[3] and multiplexed peripheral functions; supplied from VDDIO.
25 PB12 bidirectional Port B general-purpose I/O with EXTINT[12], X[12]/Y[5] and I2C-capable SERCOM pad; I2C Standard/Fast mode output low current is limited, supplied from VDDIO.
26 PB13 bidirectional Port B general-purpose I/O with EXTINT[13], X[13]/Y[14] and I2C-capable SERCOM pad; I2C Standard/Fast mode output low current is limited, supplied from VDDIO.
27 PB14 bidirectional Port B general-purpose I/O with EXTINT[14], X[14] and multiplexed peripheral functions; supplied from VDDIO.
28 PB15 bidirectional Port B general-purpose I/O with EXTINT[15], X[15] and multiplexed peripheral functions; supplied from VDDIO.
29 PA12 bidirectional Port A general-purpose I/O with EXTINT[12], SERCOM pad and AC/CMP[0]; I2C-capable with limited output low current in I2C Sm/Fm, supplied from VDDIO.
30 PA13 bidirectional Port A general-purpose I/O with EXTINT[13], SERCOM pad and AC/CMP[1]; I2C-capable with limited output low current in I2C Sm/Fm, supplied from VDDIO.
31 PA14 bidirectional Port A general-purpose I/O with EXTINT[14] and multiplexed peripheral functions; doubles as XOSC XIN when the external crystal oscillator is used, supplied from VDDIO.
32 PA15 bidirectional Port A general-purpose I/O with EXTINT[15] and multiplexed peripheral functions; doubles as XOSC XOUT when the external crystal oscillator is used, supplied from VDDIO.
33 GND power_in Ground for the digital domain.
34 VDDIO power_in Digital I/O supply voltage of 1.6 V to 3.6 V.
35 PA16 bidirectional Port A general-purpose I/O with EXTINT[0], analog input X[4] and I2C-capable SERCOM pad; supplied from VDDIO.
36 PA17 bidirectional Port A general-purpose I/O with EXTINT[1], analog input X[5] and I2C-capable SERCOM pad; a High Sink pin, supplied from VDDIO.
37 PA18 bidirectional Port A general-purpose I/O with EXTINT[2], analog input X[6] and AC/CMP[0]; supplied from VDDIO.
38 PA19 bidirectional Port A general-purpose I/O with EXTINT[3], analog input X[7] and AC/CMP[1]; supplied from VDDIO.
39 PB16 bidirectional Port B general-purpose I/O with EXTINT[0] and SERCOM5 pad; I2C-capable with limited output low current in I2C Sm/Fm, supplied from VDDIO.
40 PB17 bidirectional Port B general-purpose I/O with EXTINT[1] and SERCOM5 pad; I2C-capable with limited output low current in I2C Sm/Fm, supplied from VDDIO.
41 PA20 bidirectional Port A general-purpose I/O with EXTINT[4], analog input X[8] and SERCOM pad; supplied from VDDIO.
42 PA21 bidirectional Port A general-purpose I/O with EXTINT[5], analog input X[9] and SERCOM pad; supplied from VDDIO.
43 PA22 bidirectional Port A general-purpose I/O with EXTINT[6], analog input X[10] and I2C-capable SERCOM pad; a High Sink pin, supplied from VDDIO.
44 PA23 bidirectional Port A general-purpose I/O with EXTINT[7], analog input X[11] and I2C-capable SERCOM pad; a High Sink pin, supplied from VDDIO.
45 PA24 bidirectional Port A general-purpose I/O with EXTINT[12] and USB DM; pull resistance is 50-150 kΩ on this pin, supplied from VDDIO.
46 PA25 bidirectional Port A general-purpose I/O with EXTINT[13] and USB DP; pull resistance is 50-150 kΩ on this pin, supplied from VDDIO.
47 GND power_in Ground for the digital domain.
48 VDDIO power_in Digital I/O supply voltage of 1.6 V to 3.6 V.
49 PB22 bidirectional Port B general-purpose I/O with EXTINT[6] and SERCOM5 pad; supplied from VDDIN.
50 PB23 bidirectional Port B general-purpose I/O with EXTINT[7] and SERCOM5 pad; supplied from VDDIN.
51 PA27 bidirectional Port A general-purpose I/O with EXTINT[15] and GCLK_IO[0]; a High Sink pin, supplied from VDDIN.
52 RESET input External active-low reset input with an internal pull-up resistor.
53 VSW passive Switching regulator output in switching mode, connected to VDDCORE via a 10 µH inductor; not connected in linear regulator mode.
54 GND power_in Ground for the digital domain.
55 VDDCORE passive Core supply voltage of 0.9 V to 1.2 V typical; output of the internal regulator in linear mode, input when switching mode is used.
56 VDDIN power_in Input supply voltage of 1.6 V to 3.6 V for the regulator and the VDDIN GPIO cluster.
57 PA30 bidirectional Port A general-purpose I/O with EXTINT[10] and SWCLK debug function; supplied from VDDIN.
58 PA31 bidirectional Port A general-purpose I/O with EXTINT[11] and SWDIO debug function; a High Sink pin, supplied from VDDIN.
59 PB30 bidirectional Port B general-purpose I/O with EXTINT[14] and SERCOM5 pad; I2C-capable with limited output low current in I2C Sm/Fm, supplied from VDDIN.
60 PB31 bidirectional Port B general-purpose I/O with EXTINT[15] and SERCOM5 pad; I2C-capable with limited output low current in I2C Sm/Fm, supplied from VDDIN.
61 PB00 bidirectional Port B general-purpose I/O with EXTINT[0] and analog input AIN[8]; a backup-domain pin supplied from VSWOUT.
62 PB01 bidirectional Port B general-purpose I/O with EXTINT[1] and analog input AIN[9]; a backup-domain pin supplied from VSWOUT.
63 PB02 bidirectional Port B general-purpose I/O with EXTINT[2] and analog input AIN[10]; a backup-domain pin supplied from VSWOUT.
64 PB03 bidirectional Port B general-purpose I/O with EXTINT[3] and analog input AIN[11]; also the VBAT battery supply input when used for battery backup.
65 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package QFN-64-EP(9x9)
Category Single Chip Microcomputer/Microcontroller
Pins 65

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 indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. In self-capacitance mode, the PTC requires only one pin (Y-line) for each touch sensor. 1034

CAD (KiCad official)

  • Symbol: ATSAML21J18B-MUT
  • Footprint: Package_DFN_QFN:QFN-64-1EP_9x9mm_P0.5mm_EP6x6mm
  • 3D model: QFN-64-EP(9x9) (KiCad packages3D, STEP)
  • 3D model files: atsaml21j18b-mut-etched.step / atsaml21j18b-mut-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsaml21j18b-mut.step / atsaml21j18b-mut.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (1158 pp, sha256 c7ade1efde79dc98, retrieved 2026-10-31, 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