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ATSAMD21J18A-AFT

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Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), TQFP-64(10x10). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentsingle chip microcomputer-microcontrolleratsamd21j18a-aftfactory-2.0.0extractor-text

Verified ATSAMD21J18A-AFT

by Ray · last 30 Oct 2026 · 1 record · files match
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Verification log 1 record

30 Oct 2026RayPublished by the parts factory: tier mfr, 64 pinsfiles match
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  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATSAMD21J18A-AFT · TQFP-64(10x10) · 64 pins
  • ✓copper: 64 copper pads, none touching another net
  • ✓datasheet: all 64 pin names found in the 1115-page datasheet
  • ✓distributor: lcsc C2053474, digikey ATSAMD21J18A-AFTTR-ND, mouser 556-ATSAMD21J18A-AFT
  • ✓family: TQFP-64_10x10mm_P0.5mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-l78t0zxj/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: 64 pins = 64 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 64 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ atsamd21j18a-aft.kicad_sym✓ atsamd21j18a-aft.kicad_mod✓ atsamd21j18a-aft.step
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Contents

README

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ATSAMD21J18A-AFT

Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · TQFP-64(10x10)

ATSAMD21J18A-AFT from Microchip Tech, in a TQFP-64(10x10). 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 General-purpose I/O on VDDANA with EXTINT[0], SERCOM1/PAD[0] and TCC2/WO[0]; also the XIN32 32kHz crystal input.
2 PA01 bidirectional General-purpose I/O on VDDANA with EXTINT[1], SERCOM1/PAD[1] and TCC2/WO[1]; also the XOUT32 32kHz crystal output.
3 PA02 bidirectional General-purpose I/O on VDDANA with EXTINT[2], ADC AIN[0], PTC Y[0], DAC VOUT and TCC3/WO[0].
4 PA03 bidirectional General-purpose I/O on VDDANA with EXTINT[3], ADC/DAC VREFA, ADC AIN[1], PTC Y[1] and TCC3/WO[1].
5 PB04 bidirectional General-purpose I/O on VDDANA with EXTINT[4], ADC AIN[12] and PTC Y[10].
6 PB05 bidirectional General-purpose I/O on VDDANA with EXTINT[5], ADC AIN[13] and PTC Y[11].
7 GNDANA power_in Ground for the analog power domain (VDDANA).
8 VDDANA power_in Analog supply, 1.62V to 3.63V, decoupled with 100nF and 10µF, optionally via a ferrite bead from VDD.
9 PB06 bidirectional General-purpose I/O on VDDANA with EXTINT[6], ADC AIN[14] and PTC Y[12].
10 PB07 bidirectional General-purpose I/O on VDDANA with EXTINT[7], ADC AIN[15] and PTC Y[13].
11 PB08 bidirectional General-purpose I/O on VDDANA with EXTINT[8], ADC AIN[2], PTC Y[14], SERCOM4/PAD[0], TC4/WO[0] and TCC3/WO[6].
12 PB09 bidirectional General-purpose I/O on VDDANA with EXTINT[9], ADC AIN[3], PTC Y[15], SERCOM4/PAD[1], TC4/WO[1] and TCC3/WO[7].
13 PA04 bidirectional General-purpose I/O on VDDANA with EXTINT[4], ADC/VREFB, ADC AIN[4], AC AIN[0], PTC Y[2], SERCOM0/PAD[0], TCC0/WO[0] and TCC3/WO[2].
14 PA05 bidirectional General-purpose I/O on VDDANA with EXTINT[5], ADC AIN[5], AC AIN[1], PTC Y[3], SERCOM0/PAD[1], TCC0/WO[1] and TCC3/WO[3].
15 PA06 bidirectional General-purpose I/O on VDDANA with EXTINT[6], ADC AIN[6], AC AIN[2], PTC Y[4], SERCOM0/PAD[2], TCC1/WO[0] and TCC3/WO[4].
16 PA07 bidirectional General-purpose I/O on VDDANA with EXTINT[7], ADC AIN[7], AC AIN[3], PTC Y[5], SERCOM0/PAD[3], TCC1/WO[1], TCC3/WO[5] and I2S/SD[0].
17 PA08 bidirectional General-purpose I/O on VDDIO with NMI, ADC AIN[16], PTC X[0], SERCOM0/PAD[0] or SERCOM2/PAD[0], TCC0/WO[0], TCC1/WO[2] and I2S/SD[1].
18 PA09 bidirectional General-purpose I/O on VDDIO with EXTINT[9], ADC AIN[17], PTC X[1], SERCOM0/PAD[1] or SERCOM2/PAD[1], TCC0/WO[1], TCC1/WO[3] and I2S/MCK[0].
19 PA10 bidirectional General-purpose I/O on VDDIO with EXTINT[10], ADC AIN[18], PTC X[2], SERCOM0/PAD[2] or SERCOM2/PAD[2], TCC1/WO[0], TCC0/WO[2], I2S/SCK[0] and GCLK_IO[4].
20 PA11 bidirectional General-purpose I/O on VDDIO with EXTINT[11], ADC AIN[19], PTC X[3], SERCOM0/PAD[3] or SERCOM2/PAD[3], TCC1/WO[1], TCC0/WO[3], I2S/FS[0] and GCLK_IO[5].
21 VDDIO power_in Digital I/O supply, 1.62V to 3.63V, decoupled with 100nF and 10µF close to the pin.
22 GND power_in Ground.
23 PB10 bidirectional General-purpose I/O on VDDIO with EXTINT[10], SERCOM4/PAD[2], TC5/WO[0], TCC0/WO[4], I2S/MCK[1] and GCLK_IO[4].
24 PB11 bidirectional General-purpose I/O on VDDIO with EXTINT[11], SERCOM4/PAD[3], TC5/WO[1], TCC0/WO[5], I2S/SCK[1] and GCLK_IO[5].
25 PB12 bidirectional General-purpose I/O on VDDIO with EXTINT[12], PTC X[12], SERCOM4/PAD[0], TC4/WO[0], TCC0/WO[6], I2S/FS[1] and GCLK_IO[6].
26 PB13 bidirectional General-purpose I/O on VDDIO with EXTINT[13], PTC X[13], SERCOM4/PAD[1], TC4/WO[1], TCC0/WO[7] and GCLK_IO[7].
27 PB14 bidirectional General-purpose I/O on VDDIO with EXTINT[14], PTC X[14], SERCOM4/PAD[2], TC5/WO[0] and GCLK_IO[0].
28 PB15 bidirectional General-purpose I/O on VDDIO with EXTINT[15], PTC X[15], SERCOM4/PAD[3], TC5/WO[1] and GCLK_IO[1].
29 PA12 bidirectional General-purpose I/O on VDDIO with EXTINT[12], SERCOM2/PAD[0] or SERCOM4/PAD[0], TCC2/WO[0], TCC0/WO[6] and AC/CMP[0].
30 PA13 bidirectional General-purpose I/O on VDDIO with EXTINT[13], SERCOM2/PAD[1] or SERCOM4/PAD[1], TCC2/WO[1], TCC0/WO[7] and AC/CMP[1].
31 PA14 bidirectional General-purpose I/O on VDDIO with EXTINT[14], SERCOM2/PAD[2] or SERCOM4/PAD[2], TC3/WO[0], TCC0/WO[4] and GCLK_IO[0]; also the XIN crystal input.
32 PA15 bidirectional General-purpose I/O on VDDIO with EXTINT[15], SERCOM2/PAD[3] or SERCOM4/PAD[3], TC3/WO[1], TCC0/WO[5] and GCLK_IO[1]; also the XOUT crystal output.
33 GND power_in Ground.
34 VDDIO power_in Digital I/O supply, 1.62V to 3.63V, decoupled with 100nF and 10µF close to the pin.
35 PA16 bidirectional General-purpose I/O on VDDIO with EXTINT[0], PTC X[4], SERCOM1/PAD[0] or SERCOM3/PAD[0], TCC2/WO[0], TCC0/WO[6] and GCLK_IO[2].
36 PA17 bidirectional General-purpose I/O on VDDIO with EXTINT[1], PTC X[5], SERCOM1/PAD[1] or SERCOM3/PAD[1], TCC2/WO[1], TCC0/WO[7] and GCLK_IO[3].
37 PA18 bidirectional General-purpose I/O on VDDIO with EXTINT[2], PTC X[6], SERCOM1/PAD[2] or SERCOM3/PAD[2], TC3/WO[0], TCC0/WO[2] and AC/CMP[0].
38 PA19 bidirectional General-purpose I/O on VDDIO with EXTINT[3], PTC X[7], SERCOM1/PAD[3] or SERCOM3/PAD[3], TC3/WO[1], TCC0/WO[3], I2S/SD[0] and AC/CMP[1].
39 PB16 bidirectional General-purpose I/O on VDDIO with EXTINT[0], SERCOM5/PAD[0], TC6/WO[0], TCC0/WO[4], I2S/SD[1] and GCLK_IO[2].
40 PB17 bidirectional General-purpose I/O on VDDIO with EXTINT[1], SERCOM5/PAD[1], TC6/WO[1], TCC0/WO[5], I2S/MCK[0] and GCLK_IO[3].
41 PA20 bidirectional General-purpose I/O on VDDIO with EXTINT[4], PTC X[8], SERCOM5/PAD[2] or SERCOM3/PAD[2], TC7/WO[0], TCC0/WO[6], I2S/SCK[0] and GCLK_IO[4].
42 PA21 bidirectional General-purpose I/O on VDDIO with EXTINT[5], PTC X[9], SERCOM5/PAD[3] or SERCOM3/PAD[3], TC7/WO[1], TCC0/WO[7], I2S/FS[0] and GCLK_IO[5].
43 PA22 bidirectional General-purpose I/O on VDDIO with EXTINT[6], PTC X[10], SERCOM3/PAD[0] or SERCOM5/PAD[0], TC4/WO[0], TCC0/WO[4] and GCLK_IO[6].
44 PA23 bidirectional General-purpose I/O on VDDIO with EXTINT[7], PTC X[11], SERCOM3/PAD[1] or SERCOM5/PAD[1], TC4/WO[1], TCC0/WO[5], USB SOF 1kHz and GCLK_IO[7].
45 PA24 bidirectional General-purpose I/O on VDDIO with EXTINT[12], SERCOM3/PAD[2] or SERCOM5/PAD[2], TC5/WO[0], TCC1/WO[2] and USB DM; enable a pull-up if left unconnected.
46 PA25 bidirectional General-purpose I/O on VDDIO with EXTINT[13], SERCOM3/PAD[3] or SERCOM5/PAD[3], TC5/WO[1], TCC1/WO[3] and USB DP; enable a pull-up if left unconnected.
47 GND power_in Ground.
48 VDDIO power_in Digital I/O supply, 1.62V to 3.63V, decoupled with 100nF and 10µF close to the pin.
49 PB22 bidirectional General-purpose I/O on VDDIO with EXTINT[6], SERCOM5/PAD[2], TC7/WO[0], TCC3/WO[0] and GCLK_IO[0].
50 PB23 bidirectional General-purpose I/O on VDDIO with EXTINT[7], SERCOM5/PAD[3], TC7/WO[1], TCC3/WO[1] and GCLK_IO[1].
51 PA27 bidirectional General-purpose I/O on VDDIO with EXTINT[15], TCC3/WO[6] and GCLK_IO[0].
52 RESET input Active-low external reset input (RESETN) with internal pull-up; low-level threshold below 0.33VDDIO at VDDIO 1.6V-2.0V and below 0.36VDDIO at 2.7V-3.6V.
53 PA28 bidirectional General-purpose I/O on VDDIO with EXTINT[8], TCC3/WO[7] and GCLK_IO[0].
54 GND power_in Ground.
55 VDDCORE power_out Regulated core supply output of 1.6V to 1.8V, requiring an external 1µF decoupling capacitor.
56 VDDIN power_in Voltage regulator input supply, 1.62V to 3.63V.
57 PA30 bidirectional General-purpose I/O on VDDIO with EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], TCC3/WO[4], GCLK_IO[0] and the SWCLK debug clock.
58 PA31 bidirectional General-purpose I/O on VDDIO with EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1], TCC3/WO[5] and the SWDIO debug data line (active only with a debugger present).
59 PB30 bidirectional General-purpose I/O on VDDIO with EXTINT[14], SERCOM5/PAD[0], TCC0/WO[0] and TCC1/WO[2].
60 PB31 bidirectional General-purpose I/O on VDDIO with EXTINT[15], SERCOM5/PAD[1], TCC0/WO[1] and TCC1/WO[3].
61 PB00 bidirectional General-purpose I/O on VDDANA with EXTINT[0], ADC AIN[8], PTC Y[6], SERCOM5/PAD[2] and TC7/WO[0].
62 PB01 bidirectional General-purpose I/O on VDDANA with EXTINT[1], ADC AIN[9], PTC Y[7], SERCOM5/PAD[3] and TC7/WO[1].
63 PB02 bidirectional General-purpose I/O on VDDANA with EXTINT[2], ADC AIN[10], PTC Y[8], SERCOM5/PAD[0], TC6/WO[0] and TCC3/WO[2].
64 PB03 bidirectional General-purpose I/O on VDDANA with EXTINT[3], ADC AIN[11], PTC Y[9], SERCOM5/PAD[1], TC6/WO[1] and TCC3/WO[3].

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package TQFP-64(10x10)
Category Single Chip Microcomputer/Microcontroller
Pins 64

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 (SAM D21) VDD 1.62 3.63 V SAM D21: 1.62V, 3.63V; same voltage on VDDIN, VDDIO and VDDANA 2
Operating temperature range (suffix F) -40 125 °C F = -40 - 125°C Matte Sn Plating 17
CPU maximum frequency Fmax 48 MHz Arm Cortex-M0+ CPU running at up to 48 MHz 1
VDDCORE internal regulated voltage VDDCORE 1.2 V Internal regulated voltage output 36

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. 860

CAD (KiCad official)

  • Symbol: ATSAMD21J18A-AFT
  • Footprint: Package_QFP:TQFP-64_10x10mm_P0.5mm
  • 3D model: TQFP-64(10x10) (KiCad packages3D, STEP)
  • 3D model files: atsamd21j18a-aft-etched.step / atsamd21j18a-aft-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamd21j18a-aft.step / atsamd21j18a-aft.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (1115 pp, sha256 41365486d7c9f316, retrieved 2026-10-30, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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