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ATSAMC21N18A-AN

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Microchip Tech Pre-ordered MCUs, TQFP-100(14x14). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentembedded processors & controllersatsamc21n18a-anfactory-2.0.0extractor-text

Verified ATSAMC21N18A-AN

by Ray · last 13 Nov 2026 · 1 record · files match
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Verification log 1 record

13 Nov 2026RayPublished by the parts factory: tier mfr, 100 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • •array (skip): not an array of element pairs
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATSAMC21N18A-AN · TQFP-100(14x14) · 100 pins
  • ✓copper: 100 copper pads, none touching another net
  • ✓datasheet: all 100 pin names found in the 1206-page datasheet
  • ✓distributor: lcsc C1340765, digikey 150-ATSAMC21N18A-AN-ND, mouser 556-ATSAMC21N18A-AN
  • ✓family: TQFP-100_14x14mm_P0.5mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-9lcpkm_k/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • ✓package_fit: height and body within the datasheet's package drawing (datasheet p.1128)
  • ✓pads: 100 pins = 100 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 100 pins agree
  • ✓symbol_text: no pin names collide
  • ✓viewers: viewers/footprint.html 108 kB, viewers/symbol.html 61 kB
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ atsamc21n18a-an.kicad_sym✓ atsamc21n18a-an.kicad_mod✓ atsamc21n18a-an.step
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Contents

README

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ATSAMC21N18A-AN

Microchip Tech · Pre-ordered MCUs · TQFP-100(14x14)

ATSAMC21N18A-AN from Microchip Tech, in a TQFP-100(14x14). 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 supply, EXTINT[0], SERCOM1/PAD[0], TC2/WO[0]; also XIN32 for the 32.768 kHz crystal.
2 PA01 bidirectional General-purpose I/O on VDDANA supply, EXTINT[1], SERCOM1/PAD[1], TC2/WO[1]; also XOUT32 for the 32.768 kHz crystal.
3 PC00 bidirectional General-purpose I/O on VDDANA supply with EXTINT[8] and ADC1 AIN[8].
4 PC01 bidirectional General-purpose I/O on VDDANA supply with EXTINT[9] and ADC1 AIN[9].
5 PC02 bidirectional General-purpose I/O on VDDANA supply with EXTINT[10] and ADC1 AIN[10].
6 PC03 bidirectional General-purpose I/O on VDDIO supply with EXTINT[11], ADC1 AIN[11], SERCOM7/PAD[0], TCC2/WO[0].
7 PA02 bidirectional General-purpose I/O on VDDANA supply with EXTINT[2], ADC0 AIN[0], ADC1 AIN[4], PTC Y[0], DAC VOUT.
8 PA03 bidirectional General-purpose I/O on VDDANA supply with EXTINT[3], ADC-DAC VREFA, ADC0 AIN[1], PTC Y[1].
9 PB04 bidirectional General-purpose I/O on VDDANA supply with EXTINT[4], ADC0 AIN[6], ADC1 AIN[5], PTC Y[10].
10 PB05 bidirectional General-purpose I/O on VDDANA supply with EXTINT[5], ADC0 AIN[7], ADC1 AIN[6], PTC Y[11].
11 GNDANA power_in Analog ground, the return for the VDDANA supply.
12 VDDANA power_in Analog supply input, 2.7V to 5.5V device operating range.
13 PB06 bidirectional General-purpose I/O on VDDIO supply with EXTINT[6], ADC0 AIN[8], SDADC AINN[2], ADC1 AIN[7], PTC Y[12], SERCOM7/PAD[1].
14 PB07 bidirectional General-purpose I/O on VDDIO supply with EXTINT[7], ADC0 AIN[9], SDADC AINP[2], PTC Y[13], SERCOM7 PAD[3]/PAD[2].
15 PB08 bidirectional General-purpose I/O on VDDIO supply with EXTINT[8], ADC0 AIN[2], ADC1 AIN[4], SDADC AINN[1], PTC Y[14], TC4/WO[0].
16 PB09 bidirectional General-purpose I/O on VDDANA supply with EXTINT[9], ADC0 AIN[3], ADC1 AIN[5], SDADC AINP[1], PTC Y[15], SERCOM4/PAD[1], TC4/WO[1].
17 PA04 bidirectional General-purpose I/O on VDDANA supply with EXTINT[4], SDADC VREFB, ADC0 AIN[4], ADC1 AIN[0], PTC Y[2], SERCOM0/PAD[0].
18 PA05 bidirectional General-purpose I/O on VDDANA supply with EXTINT[5], ADC0 AIN[5], ADC1 AIN[1], PTC Y[3], SERCOM0/PAD[1].
19 PA06 bidirectional General-purpose I/O on VDDANA supply with EXTINT[6], ADC0 AIN[6], SDADC AINN[0], ADC1 AIN[2], PTC Y[4], SERCOM0/PAD[2].
20 PA07 bidirectional General-purpose I/O on VDDANA supply with EXTINT[7], ADC0 AIN[7], SDADC AINP[0], ADC1 AIN[3], PTC Y[5], SERCOM0/PAD[3].
21 PC05 bidirectional General-purpose I/O on VDDANA supply with EXTINT[13], SERCOM6/PAD[3], TCC2/WO[1].
22 PC06 bidirectional General-purpose I/O on VDDANA supply with EXTINT[14], SERCOM6/PAD[0].
23 PC07 bidirectional General-purpose I/O on VDDANA supply with EXTINT[15], SERCOM6/PAD[1].
24 GND power_in Ground for the I/O cluster supplied by VDDIO pin 25.
25 VDDIO power_in Digital I/O supply input, 2.7V to 5.5V device operating range.
26 PA08 bidirectional General-purpose I/O on VDDIO supply with NMI, ADC0 AIN[10], PTC X[0]/Y[16], SERCOM0/PAD[0], SERCOM2/PAD[0], TCC0/WO[0]; supports I2C.
27 PA09 bidirectional General-purpose I/O on VDDIO supply with EXTINT[9], ADC0 AIN[11], PTC X[1]/Y[17], SERCOM0/PAD[1], SERCOM2/PAD[1], TCC0/WO[1]; supports I2C.
28 PA10 bidirectional General-purpose I/O on VDDIO supply with EXTINT[10], PTC X[2]/Y[18], SERCOM0/PAD[2], SERCOM2/PAD[2], TCC0/WO[2], GCLK_IO[4].
29 PA11 bidirectional General-purpose I/O on VDDIO supply with EXTINT[11], PTC X[3]/Y[19], SERCOM0/PAD[3], SERCOM2/PAD[3], TCC0/WO[3], GCLK_IO[5].
30 PB10 bidirectional General-purpose I/O on VDDIO supply with EXTINT[10], SERCOM4/PAD[2], TC5/WO[0], TCC0 WO4, GCLK_IO[4].
31 PB11 bidirectional General-purpose I/O on VDDIO supply with EXTINT[11], SERCOM4/PAD[3], TC5/WO[1], TCC0 WO5, GCLK_IO[5].
32 PB12 bidirectional General-purpose I/O on VDDIO supply with EXTINT[12], PTC X[12]/Y[28], SERCOM4/PAD[0], TCC0 WO6, CAN1/TX; supports I2C.
33 PB13 bidirectional General-purpose I/O on VDDIO supply with EXTINT[13], PTC X[13]/Y[29], SERCOM4/PAD[1], TCC0 WO7, CAN1/RX; supports I2C.
34 PB14 bidirectional General-purpose I/O on VDDIO supply with EXTINT[14], PTC X[14]/Y[30], SERCOM4/PAD[2], CAN1/TX, GCLK_IO[0].
35 PB15 bidirectional General-purpose I/O on VDDIO supply with EXTINT[15], PTC X[15]/Y[31], SERCOM4/PAD[3], CAN1/RX, GCLK_IO[1].
36 VDDIO power_in Digital I/O supply input, 2.7V to 5.5V device operating range.
37 GND power_in Ground for the I/O clusters supplied by VDDIO pins 36 and 25.
38 PC08 bidirectional General-purpose I/O on VDDIO supply with EXTINT[0], SERCOM6/PAD[0], SERCOM7/PAD[0].
39 PC09 bidirectional General-purpose I/O on VDDIO supply with EXTINT[1], SERCOM6/PAD[1], SERCOM7/PAD[1].
40 PC10 bidirectional General-purpose I/O on VDDIO supply with EXTINT[2], SERCOM6/PAD[2], SERCOM7/PAD[2].
41 PC11 bidirectional General-purpose I/O on VDDIO supply with EXTINT[3], SERCOM6/PAD[3], SERCOM7/PAD[3].
42 PC12 bidirectional General-purpose I/O on VDDIO supply with EXTINT[4], SERCOM7/PAD[0].
43 PC13 bidirectional General-purpose I/O on VDDIO supply with EXTINT[5], SERCOM7/PAD[1].
44 PC14 bidirectional General-purpose I/O on VDDIO supply with EXTINT[6], SERCOM7/PAD[2].
45 PC15 bidirectional General-purpose I/O on VDDIO supply with EXTINT[7], SERCOM7/PAD[3].
46 PA12 bidirectional General-purpose I/O on VDDIO supply with EXTINT[12], SERCOM2/PAD[0], SERCOM4/PAD[0], TC2/WO[0], TCC0 WO6, AC CMP[0].
47 PA13 bidirectional General-purpose I/O on VDDIO supply with EXTINT[13], SERCOM2/PAD[1], SERCOM4/PAD[1], TC2/WO[1], TCC0 WO7, AC CMP[1].
48 PA14 bidirectional General-purpose I/O on VDDIO supply with EXTINT[14], SERCOM2/PAD[2], TC3/WO[0], GCLK_IO[0]; also XIN for the crystal oscillator.
49 PA15 bidirectional General-purpose I/O on VDDIO supply with EXTINT[15], SERCOM2/PAD[3], TC3/WO[1], GCLK_IO[1]; also XOUT for the crystal oscillator.
50 GND power_in Ground for the I/O clusters supplied by VDDIO pins 51 and 36.
51 VDDIO power_in Digital I/O supply input, 2.7V to 5.5V device operating range.
52 PA16 bidirectional General-purpose I/O on VDDIO supply with EXTINT[0], PTC X[4]/Y[20], SERCOM1/PAD[0], SERCOM3/PAD[0], TCC1/WO[0], GCLK_IO[2]; supports I2C.
53 PA17 bidirectional General-purpose I/O on VDDIO supply with EXTINT[1], PTC X[5]/Y[21], SERCOM1/PAD[1], SERCOM3/PAD[1], TCC1/WO[1], GCLK_IO[3]; supports I2C.
54 PA18 bidirectional General-purpose I/O on VDDIO supply with EXTINT[2], PTC X[6]/Y[22], SERCOM1/PAD[2], SERCOM3/PAD[2], TCC1/WO[2], AC CMP[0].
55 PA19 bidirectional General-purpose I/O on VDDIO supply with EXTINT[3], PTC X[7]/Y[23], SERCOM1/PAD[3], SERCOM3/PAD[3], TCC1/WO[3], AC CMP[1].
56 PC16 bidirectional General-purpose I/O on VDDIO supply with EXTINT[8], SERCOM6/PAD[0].
57 PC17 bidirectional General-purpose I/O on VDDIO supply with EXTINT[9], SERCOM6/PAD[1].
58 PC18 bidirectional General-purpose I/O on VDDIO supply with EXTINT[10], SERCOM6/PAD[2].
59 PC19 bidirectional General-purpose I/O on VDDIO supply with EXTINT[11], SERCOM6/PAD[3].
60 PC20 bidirectional General-purpose I/O on VDDIO supply with EXTINT[12] and CCL3/IN[9].
61 PC21 bidirectional General-purpose I/O on VDDIO supply with EXTINT[13] and CCL3/IN[10].
62 GND power_in Ground for the I/O clusters supplied by VDDIO pins 63 and 51.
63 VDDIO power_in Digital I/O supply input, 2.7V to 5.5V device operating range.
64 PB16 bidirectional General-purpose I/O on VDDIO supply with EXTINT[0], SERCOM5/PAD[0], TC6/WO[0], GCLK_IO[2]; supports I2C.
65 PB17 bidirectional General-purpose I/O on VDDIO supply with EXTINT[1], SERCOM5/PAD[1], TC6/WO[1], GCLK_IO[3]; supports I2C.
66 PB18 bidirectional General-purpose I/O on VDDIO supply with EXTINT[2], SERCOM5/PAD[2], SERCOM3/PAD[2], GCLK_IO[4].
67 PB19 bidirectional General-purpose I/O on VDDIO supply with EXTINT[3], SERCOM5/PAD[3], SERCOM3/PAD[3], GCLK_IO[5].
68 PB20 bidirectional General-purpose I/O on VDDIO supply with EXTINT[4], SERCOM3/PAD[0], SERCOM2/PAD[0], GCLK_IO[6].
69 PB21 bidirectional General-purpose I/O on VDDIO supply with EXTINT[5], SERCOM3/PAD[1], SERCOM2/PAD[1], GCLK_IO[7].
70 PA20 bidirectional General-purpose I/O on VDDIO supply with EXTINT[4], PTC X[8]/Y[24], SERCOM5/PAD[2], SERCOM3/PAD[2], TC7/WO[0], TCC2/WO[0].
71 PA21 bidirectional General-purpose I/O on VDDIO supply with EXTINT[5], PTC X[9]/Y[25], SERCOM5/PAD[3], SERCOM3/PAD[3], TC7/WO[1], TCC2/WO[1].
72 PA22 bidirectional General-purpose I/O on VDDIO supply with EXTINT[6], PTC X[10]/Y[26], SERCOM3/PAD[0], SERCOM5/PAD[0], TC4/WO[0], CAN0/TX.
73 PA23 bidirectional General-purpose I/O on VDDIO supply with EXTINT[7], PTC X[11]/Y[27], SERCOM3/PAD[1], SERCOM5/PAD[1], TC4/WO[1], CAN0/RX.
74 PA24 bidirectional General-purpose I/O on VDDIO supply with EXTINT[12], SERCOM3/PAD[2], SERCOM5/PAD[2], TC5/WO[0], TCC2/WO[0], CAN0/TX, AC CMP[2].
75 PA25 bidirectional General-purpose I/O on VDDIO supply with EXTINT[13], SERCOM3/PAD[3], SERCOM5/PAD[3], TC5/WO[1], TCC2/WO[1], CAN0/RX, AC CMP[3].
76 GND power_in Ground for the I/O cluster supplied by VDDIO pin 77.
77 VDDIO power_in Digital I/O supply input, 2.7V to 5.5V device operating range.
78 PB22 bidirectional General-purpose I/O on VDDIO supply with EXTINT[6], SERCOM0/PAD[2], SERCOM5/PAD[2], TC7/WO[0], TCC1/WO[2], GCLK_IO[0].
79 PB23 bidirectional General-purpose I/O on VDDIO supply with EXTINT[7], SERCOM0/PAD[3], SERCOM5/PAD[3], TC7/WO[1], TCC1/WO[3], GCLK_IO[1].
80 PB24 bidirectional General-purpose I/O on VDDIO supply with EXTINT[8], SERCOM0/PAD[0], SERCOM4/PAD[0], AC CMP[0].
81 PB25 bidirectional General-purpose I/O on VDDIO supply with EXTINT[9], SERCOM0/PAD[1], SERCOM4/PAD[1], AC CMP[1].
82 PC24 bidirectional General-purpose I/O on VDDIO supply with EXTINT[0], SERCOM0/PAD[2], SERCOM4/PAD[2].
83 PC25 bidirectional General-purpose I/O on VDDIO supply with EXTINT[1], SERCOM0/PAD[3], SERCOM4/PAD[3].
84 PC26 bidirectional General-purpose I/O on VDDIO supply with EXTINT[2].
85 PC27 bidirectional General-purpose I/O on VDDIO supply with EXTINT[3], SERCOM1/PAD[0], CCL1/IN[4].
86 PC28 bidirectional General-purpose I/O on VDDIO supply with EXTINT[4], SERCOM1/PAD[1], CCL1/IN[5].
87 PA27 bidirectional General-purpose I/O on VDDIN supply with EXTINT[15] and GCLK_IO[0].
88 RESET input Active-low external reset input.
89 PA28 bidirectional General-purpose I/O on VDDIN supply with EXTINT[8] and GCLK_IO[0].
90 GND power_in Ground for the I/O cluster supplied by VDDIN pin 92.
91 VDDCORE power_out Regulated core supply output.
92 VDDIN power_in Input supply to the internal regulator and VDDIN I/O cluster, 2.7V to 5.5V device operating range.
93 PA30 bidirectional General-purpose I/O on VDDIN supply with EXTINT[10], SERCOM1/PAD[2], TC1/WO[0]; SWCLK for Serial Wire Debug.
94 PA31 bidirectional General-purpose I/O on VDDIN supply with EXTINT[11], SERCOM1/PAD[3], TC1/WO[1]; SWDIO for Serial Wire Debug.
95 PB30 bidirectional General-purpose I/O on VDDIN supply with EXTINT[14], SERCOM1/PAD[0], SERCOM5/PAD[0], TC0/WO[0], AC CMP[2].
96 PB31 bidirectional General-purpose I/O on VDDIN supply with EXTINT[15], SERCOM1/PAD[1], SERCOM5/PAD[1], TC0/WO[1], AC CMP[3].
97 PB00 bidirectional General-purpose I/O on VDDANA supply with EXTINT[0], ADC0 AIN[0], PTC Y[6], SERCOM5/PAD[2], TC7/WO[0].
98 PB01 bidirectional General-purpose I/O on VDDANA supply with EXTINT[1], ADC0 AIN[1], PTC Y[7], SERCOM5/PAD[3], TC7/WO[1].
99 PB02 bidirectional General-purpose I/O on VDDANA supply with EXTINT[2], ADC0 AIN[2], PTC Y[8], SERCOM5/PAD[0], TC6/WO[0].
100 PB03 bidirectional General-purpose I/O on VDDANA supply with EXTINT[3], ADC0 AIN[3], PTC Y[9], SERCOM5/PAD[1], TC6/WO[1].

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package TQFP-100(14x14)
Category Embedded Processors & Controllers
Pins 100

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply voltage (VDDIN) VDDIN 2.7 5.5 V Powers I/O lines, OSC48M, TOSC and internal regulator; VDDIN and VDDANA must have the same voltage (VDD) 38
I/O supply voltage (VDDIO) VDDIO 2.7 5.5 V Powers I/O lines and XOSC; VDDIO must be less than or equal to VDDIN 38
Analog supply voltage (VDDANA) VDDANA 2.7 5.5 V Powers I/O lines and ADC, AC, DAC, PTC, SDADC, OSCULP32K, OSC32K, XOSC32K 38
Core voltage (internal regulator output) VDDCORE 1.2 V Internal regulated voltage output; powers core, memories, peripherals and FDPLL96M 38
Operating temperature, 105°C grade -40 105 °C Package grade N: -40 - 105°C Matte Sn Plating 18
Operating supply range (family) 2.7 5.5 V Operating Conditions 1

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
housing PC 10.3. Micro Trace Buffer MTB base address corrected from 0x41006000 to 0x41008000. 22. SUPC, Supply Controller 22.6.3.3. VDD Brown-Out Detector (BODVDD): Removed 1198
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. 987

CAD (KiCad official)

  • Symbol: ATSAMC21N18A-AN
  • Footprint: Package_QFP:TQFP-100_14x14mm_P0.5mm
  • 3D model: TQFP-100(14x14) (KiCad packages3D, STEP)
  • 3D model files: atsamc21n18a-an-etched.step / atsamc21n18a-an-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamc21n18a-an.step / atsamc21n18a-an.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (1206 pp, sha256 5991eaad10c5cd35, retrieved 2026-11-13, 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