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ATSAMD21J16B-AU

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

componentembedded processors & controllersatsamd21j16b-aufactory-2.0.0extractor-text

Verified ATSAMD21J16B-AU

by Ray · last 2 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

2 Nov 2026RayPublished by the parts factory: tier mfr, 64 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATSAMD21J16B-AU · 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 C1338788, digikey ATSAMD21J16B-AU-ND, mouser 556-ATSAMD21J16B-AU
  • ✓family: TQFP-64_10x10mm_P0.5mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-1hd5v69s/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✓ atsamd21j16b-au.kicad_sym✓ atsamd21j16b-au.kicad_mod✓ atsamd21j16b-au.step
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ATSAMD21J16B-AU

Microchip Tech · Pre-ordered MCUs · TQFP-64(10x10)

ATSAMD21J16B-AU 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 GPIO on VDDANA supply with EXTINT[0], SERCOM1/PAD[0], TCC2/WO[0]; also XIN32 for the 32kHz crystal oscillator.
2 PA01 bidirectional GPIO on VDDANA supply with EXTINT[1], SERCOM1/PAD[1], TCC2/WO[1]; also XOUT32 for the 32kHz crystal oscillator.
3 PA02 bidirectional GPIO on VDDANA supply with EXTINT[2], ADC AIN[0], PTC Y[0], DAC VOUT, TCC3/WO[0].
4 PA03 bidirectional GPIO on VDDANA supply with EXTINT[3], ADC/DAC VREFA, ADC AIN[1], PTC Y[1], TCC3/WO[1].
5 PB04 bidirectional GPIO on VDDANA supply with EXTINT[4], ADC AIN[12], PTC Y[10].
6 PB05 bidirectional GPIO on VDDANA supply with EXTINT[5], ADC AIN[13], PTC Y[11].
7 GNDANA power_in Ground for the analog power domain.
8 VDDANA power_in Analog supply voltage, 1.62V - 3.63V, with 100nF and 10µF decoupling recommended.
9 PB06 bidirectional GPIO on VDDANA supply with EXTINT[6], ADC AIN[14], PTC Y[12].
10 PB07 bidirectional GPIO on VDDANA supply with EXTINT[7], ADC AIN[15], PTC Y[13].
11 PB08 bidirectional GPIO on VDDANA supply with EXTINT[8], ADC AIN[2], PTC Y[14], SERCOM4/PAD[0], TC4/WO[0], TCC3/WO[6].
12 PB09 bidirectional GPIO on VDDANA supply with EXTINT[9], ADC AIN[3], PTC Y[15], SERCOM4/PAD[1], TC4/WO[1], TCC3/WO[7].
13 PA04 bidirectional GPIO on VDDANA supply with EXTINT[4], ADC/VREFB, ADC AIN[4], AC AIN[0], PTC Y[2], SERCOM0/PAD[0], TCC0/WO[0].
14 PA05 bidirectional GPIO on VDDANA supply with EXTINT[5], ADC AIN[5], AC AIN[1], PTC Y[3], SERCOM0/PAD[1], TCC0/WO[1].
15 PA06 bidirectional GPIO on VDDANA supply with EXTINT[6], ADC AIN[6], AC AIN[2], PTC Y[4], SERCOM0/PAD[2], TCC1/WO[0].
16 PA07 bidirectional GPIO on VDDANA supply with EXTINT[7], ADC AIN[7], AC AIN[3], PTC Y[5], SERCOM0/PAD[3], TCC1/WO[1], I2S/SD[0].
17 PA08 bidirectional GPIO on VDDIO supply with NMI, ADC AIN[16], PTC X[0], SERCOM0/PAD[0] or SERCOM2/PAD[0], TCC0/WO[0], I2S/SD[1]; supports I2C Hs mode.
18 PA09 bidirectional GPIO on VDDIO supply with EXTINT[9], ADC AIN[17], PTC X[1], SERCOM0/PAD[1] or SERCOM2/PAD[1], TCC0/WO[1], I2S/MCK[0]; supports I2C Hs mode.
19 PA10 bidirectional GPIO on VDDIO supply with EXTINT[10], ADC AIN[18], PTC X[2], SERCOM0/PAD[2] or SERCOM2/PAD[2], TCC1/WO[0], I2S/SCK[0], GCLK_IO[4].
20 PA11 bidirectional GPIO on VDDIO supply with EXTINT[11], ADC AIN[19], PTC X[3], SERCOM0/PAD[3] or SERCOM2/PAD[3], TCC1/WO[1], I2S/FS[0], GCLK_IO[5].
21 VDDIO power_in Digital I/O supply, 1.62V - 3.63V, with 100nF and 10µF decoupling recommended; supplies the PA08-PA11 cluster.
22 GND power_in Ground.
23 PB10 bidirectional GPIO on VDDIO supply with EXTINT[10], SERCOM4/PAD[2], TC5/WO[0], TCC0/WO[4], I2S/MCK[1], GCLK_IO[4].
24 PB11 bidirectional GPIO on VDDIO supply with EXTINT[11], SERCOM4/PAD[3], TC5/WO[1], TCC0/WO[5], I2S/SCK[1], GCLK_IO[5].
25 PB12 bidirectional GPIO on VDDIO supply with EXTINT[12], PTC X[12], SERCOM4/PAD[0], TC4/WO[0], TCC0/WO[6], I2S/FS[1], GCLK_IO[6]; supports I2C Hs mode.
26 PB13 bidirectional GPIO on VDDIO supply with EXTINT[13], PTC X[13], SERCOM4/PAD[1], TC4/WO[1], TCC0/WO[7], GCLK_IO[7]; supports I2C Hs mode.
27 PB14 bidirectional GPIO on VDDIO supply with EXTINT[14], PTC X[14], SERCOM4/PAD[2], TC5/WO[0], GCLK_IO[0].
28 PB15 bidirectional GPIO on VDDIO supply with EXTINT[15], PTC X[15], SERCOM4/PAD[3], TC5/WO[1], GCLK_IO[1].
29 PA12 bidirectional GPIO on VDDIO supply with EXTINT[12], SERCOM2/PAD[0] or SERCOM4/PAD[0], TCC2/WO[0], TCC0/WO[6], AC/CMP[0]; supports I2C Hs mode.
30 PA13 bidirectional GPIO on VDDIO supply with EXTINT[13], SERCOM2/PAD[1] or SERCOM4/PAD[1], TCC2/WO[1], TCC0/WO[7], AC/CMP[1]; supports I2C Hs mode.
31 PA14 bidirectional GPIO on VDDIO supply with EXTINT[14], SERCOM2/PAD[2] or SERCOM4/PAD[2], TC3/WO[0], TCC0/WO[4], GCLK_IO[0]; also XIN for the crystal oscillator.
32 PA15 bidirectional GPIO on VDDIO supply with EXTINT[15], SERCOM2/PAD[3] or SERCOM4/PAD[3], TC3/WO[1], TCC0/WO[5], GCLK_IO[1]; also XOUT for the crystal oscillator.
33 GND power_in Ground.
34 VDDIO power_in Digital I/O supply, 1.62V - 3.63V, with 100nF and 10µF decoupling recommended.
35 PA16 bidirectional GPIO on VDDIO supply with EXTINT[0], PTC X[4], SERCOM1/PAD[0] or SERCOM3/PAD[0], TCC2/WO[0], TCC0/WO[6], GCLK_IO[2]; supports I2C Hs mode.
36 PA17 bidirectional GPIO on VDDIO supply with EXTINT[1], PTC X[5], SERCOM1/PAD[1] or SERCOM3/PAD[1], TCC2/WO[1], TCC0/WO[7], GCLK_IO[3]; supports I2C Hs mode.
37 PA18 bidirectional GPIO on VDDIO supply with EXTINT[2], PTC X[6], SERCOM1/PAD[2] or SERCOM3/PAD[2], TC3/WO[0], TCC0/WO[2], AC/CMP[0].
38 PA19 bidirectional GPIO on VDDIO supply with EXTINT[3], PTC X[7], SERCOM1/PAD[3] or SERCOM3/PAD[3], TC3/WO[1], TCC0/WO[3], I2S/SD[0], AC/CMP[1].
39 PB16 bidirectional GPIO on VDDIO supply with EXTINT[0], SERCOM5/PAD[0], TC6/WO[0], TCC0/WO[4], I2S/SD[1], GCLK_IO[2]; supports I2C Hs mode.
40 PB17 bidirectional GPIO on VDDIO supply with EXTINT[1], SERCOM5/PAD[1], TC6/WO[1], TCC0/WO[5], I2S/MCK[0], GCLK_IO[3]; supports I2C Hs mode.
41 PA20 bidirectional GPIO on VDDIO supply with EXTINT[4], PTC X[8], SERCOM5/PAD[2] or SERCOM3/PAD[2], TC7/WO[0], TCC0/WO[6], I2S/SCK[0], GCLK_IO[4].
42 PA21 bidirectional GPIO on VDDIO supply with EXTINT[5], PTC X[9], SERCOM5/PAD[3] or SERCOM3/PAD[3], TC7/WO[1], TCC0/WO[7], I2S/FS[0], GCLK_IO[5].
43 PA22 bidirectional GPIO on VDDIO supply with EXTINT[6], PTC X[10], SERCOM3/PAD[0] or SERCOM5/PAD[0], TC4/WO[0], TCC0/WO[4], GCLK_IO[6]; supports I2C Hs mode.
44 PA23 bidirectional GPIO on VDDIO supply with EXTINT[7], PTC X[11], SERCOM3/PAD[1] or SERCOM5/PAD[1], TC4/WO[1], TCC0/WO[5], USB SOF 1kHz, GCLK_IO[7]; supports I2C Hs mode.
45 PA24 bidirectional GPIO on VDDIO supply with EXTINT[12], SERCOM3/PAD[2] or SERCOM5/PAD[2], TC5/WO[0], TCC1/WO[2], USB DM; if unconnected, enable a pull-up through input GPIO mode.
46 PA25 bidirectional GPIO on VDDIO supply with EXTINT[13], SERCOM3/PAD[3] or SERCOM5/PAD[3], TC5/WO[1], TCC1/WO[3], USB DP; if unconnected, enable a pull-up through input GPIO mode.
47 GND power_in Ground.
48 VDDIO power_in Digital I/O supply, 1.62V - 3.63V, with 100nF and 10µF decoupling recommended.
49 PB22 bidirectional GPIO on VDDIO supply with EXTINT[6], SERCOM5/PAD[2], TC7/WO[0], TCC3/WO[0], GCLK_IO[0].
50 PB23 bidirectional GPIO on VDDIO supply with EXTINT[7], SERCOM5/PAD[3], TC7/WO[1], TCC3/WO[1], GCLK_IO[1].
51 PA27 bidirectional GPIO on VDDIO supply with EXTINT[15], TCC3/WO[6], GCLK_IO[0].
52 RESET input Active-low external reset input with internal pull-up; low-level threshold below 0.33VDDIO (VDDIO 1.6-2.0V) or 0.36VDDIO (VDDIO 2.7-3.6V).
53 PA28 bidirectional GPIO on VDDIO supply with EXTINT[8], TCC3/WO[7], GCLK_IO[0].
54 GND power_in Ground.
55 VDDCORE power_out Regulated core supply output of 1.6V to 1.8V, requiring 1µF external decoupling capacitor.
56 VDDIN power_in Input supply, 1.62V - 3.63V, for the internal voltage regulator and the PA30/PA31/PB30/PB31 I/O cluster.
57 PA30 bidirectional GPIO on VDDIO supply with EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], TCC3/WO[4], GCLK_IO[0]; SWCLK for serial wire debug.
58 PA31 bidirectional GPIO on VDDIO supply with EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1], TCC3/WO[5]; SWDIO, activated only in the presence of a debugger.
59 PB30 bidirectional GPIO on VDDIO supply with EXTINT[14], SERCOM5/PAD[0], TCC0/WO[0], TCC1/WO[2]; supports I2C Hs mode.
60 PB31 bidirectional GPIO on VDDIO supply with EXTINT[15], SERCOM5/PAD[1], TCC0/WO[1], TCC1/WO[3]; supports I2C Hs mode.
61 PB00 bidirectional GPIO on VDDANA supply with EXTINT[0], ADC AIN[8], PTC Y[6], SERCOM5/PAD[2], TC7/WO[0].
62 PB01 bidirectional GPIO on VDDANA supply with EXTINT[1], ADC AIN[9], PTC Y[7], SERCOM5/PAD[3], TC7/WO[1].
63 PB02 bidirectional GPIO on VDDANA supply with EXTINT[2], ADC AIN[10], PTC Y[8], SERCOM5/PAD[0], TC6/WO[0], TCC3/WO[2].
64 PB03 bidirectional GPIO on VDDANA supply with EXTINT[3], ADC AIN[11], PTC Y[9], SERCOM5/PAD[1], TC6/WO[1], TCC3/WO[3].

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package TQFP-64(10x10)
Category Embedded Processors & Controllers
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; same voltage on VDDIO, VDDIN and VDDANA 2
Operating temperature (U grade) -40 85 °C Package grade U, -40 - 85°C Matte Sn plating 17
CPU clock frequency 48 MHz Arm Cortex-M0+ CPU running at up to 48 MHz 1
Internal regulated core 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: ATSAMD21J16B-AU
  • Footprint: Package_QFP:TQFP-64_10x10mm_P0.5mm
  • 3D model: TQFP-64(10x10) (KiCad packages3D, STEP)
  • 3D model files: atsamd21j16b-au-etched.step / atsamd21j16b-au-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamd21j16b-au.step / atsamd21j16b-au.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (1115 pp, sha256 bb0aa77eccb60393, retrieved 2026-11-02, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-opus-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