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ATSAMD20E18A-MN

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Microchip Tech Pre-ordered MCUs, QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentembedded processors & controllersatsamd20e18a-mnfactory-2.0.0extractor-text

Verified ATSAMD20E18A-MN

by Ray · last 30 Oct 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

30 Oct 2026RayPublished by the parts factory: tier mfr, 33 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATSAMD20E18A-MN · QFN-32-EP(5x5) · 33 pins
  • ✓copper: 33 copper pads, none touching another net
  • ✓datasheet: all 33 pin names found in the 731-page datasheet
  • ✓distributor: lcsc C614235, digikey ATSAMD20E18A-MN-ND, mouser 556-ATSAMD20E18A-MN
  • ✓family: QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-8frpylzt/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • ✓package_fit: height within the datasheet's package drawing (datasheet p.681)
  • ✓pads: 33 pins = 33 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 33 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ atsamd20e18a-mn.kicad_sym✓ atsamd20e18a-mn.kicad_mod✓ atsamd20e18a-mn.step
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Symbol & Footprint

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Contents

README

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ATSAMD20E18A-MN

Microchip Tech · Pre-ordered MCUs · QFN-32-EP(5x5)

ATSAMD20E18A-MN from Microchip Tech, in a QFN-32-EP(5x5). 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], or XIN32 (32 kHz crystal input).
2 PA01 bidirectional General-purpose I/O on VDDANA supply; EXTINT[1], SERCOM1/PAD[1], TC2/WO[1], or XOUT32 (32 kHz crystal output).
3 PA02 bidirectional General-purpose I/O on VDDANA supply; EXTINT[2], ADC AIN[0], PTC Y[0], or DAC VOUT.
4 PA03 bidirectional General-purpose I/O on VDDANA supply; EXTINT[3], ADC/DAC external reference VREFA, ADC AIN[1], or PTC Y[1].
5 PA04 bidirectional General-purpose I/O on VDDANA supply; EXTINT[4], ADC VREFB, ADC AIN[4], AC AIN[0], PTC Y[2], SERCOM0/PAD[0], or TC0/WO[0].
6 PA05 bidirectional General-purpose I/O on VDDANA supply; EXTINT[5], ADC AIN[5], AC AIN[1], PTC Y[3], SERCOM0/PAD[1], or TC0/WO[1].
7 PA06 bidirectional General-purpose I/O on VDDANA supply; EXTINT[6], ADC AIN[6], AC AIN[2], PTC Y[4], SERCOM0/PAD[2], or TC1/WO[0].
8 PA07 bidirectional General-purpose I/O on VDDANA supply; EXTINT[7], ADC AIN[7], AC AIN[3], PTC Y[5], SERCOM0/PAD[3], or TC1/WO[1].
9 VDDANA power_in Analog supply, 1.62V to 3.63V, powering the ADC, AC, DAC, PTC and 32 kHz oscillators; internally connected to VDDIO in this package.
10 GND power_in Ground.
11 PA08 bidirectional General-purpose I/O on VDDIO supply with I2C-capable pad; NMI, ADC AIN[16], PTC X[0], SERCOM0/PAD[0], SERCOM2/PAD[0], or TC0/WO[0].
12 PA09 bidirectional General-purpose I/O on VDDIO supply with I2C-capable pad; EXTINT[9], ADC AIN[17], PTC X[1], SERCOM0/PAD[1], SERCOM2/PAD[1], or TC0/WO[1].
13 PA10 bidirectional General-purpose I/O on VDDIO supply; EXTINT[10], ADC AIN[18], PTC X[2], SERCOM0/PAD[2], SERCOM2/PAD[2], TC1/WO[0], or GCLK_IO[4].
14 PA11 bidirectional General-purpose I/O on VDDIO supply; EXTINT[11], ADC AIN[19], PTC X[3], SERCOM0/PAD[3], SERCOM2/PAD[3], TC1/WO[1], or GCLK_IO[5].
15 PA14 bidirectional General-purpose I/O on VDDIO supply; EXTINT[14], SERCOM2/PAD[2], TC3/WO[0], GCLK_IO[0], or XIN (crystal oscillator input).
16 PA15 bidirectional General-purpose I/O on VDDIO supply; EXTINT[15], SERCOM2/PAD[3], TC3/WO[1], GCLK_IO[1], or XOUT (crystal oscillator output).
17 PA16 bidirectional General-purpose I/O on VDDIO supply with I2C-capable pad; EXTINT[0], PTC X[4], SERCOM1/PAD[0], SERCOM3/PAD[0], TC2/WO[0], or GCLK_IO[2].
18 PA17 bidirectional General-purpose I/O on VDDIO supply with I2C-capable pad; EXTINT[1], PTC X[5], SERCOM1/PAD[1], SERCOM3/PAD[1], TC2/WO[1], or GCLK_IO[3].
19 PA18 bidirectional General-purpose I/O on VDDIO supply; EXTINT[2], PTC X[6], SERCOM1/PAD[2], SERCOM3/PAD[2], TC3/WO[0], or AC CMP[0].
20 PA19 bidirectional General-purpose I/O on VDDIO supply; EXTINT[3], PTC X[7], SERCOM1/PAD[3], SERCOM3/PAD[3], TC3/WO[1], or AC CMP[1].
21 PA22 bidirectional General-purpose I/O on VDDIO supply with I2C-capable pad; EXTINT[6], PTC X[10], SERCOM3/PAD[0], TC4/WO[0], or GCLK_IO[6].
22 PA23 bidirectional General-purpose I/O on VDDIO supply with I2C-capable pad; EXTINT[7], PTC X[11], SERCOM3/PAD[1], TC4/WO[1], or GCLK_IO[7].
23 PA24 bidirectional General-purpose I/O on VDDIO supply; EXTINT[12], SERCOM3/PAD[2], or TC5/WO[0].
24 PA25 bidirectional General-purpose I/O on VDDIO supply; EXTINT[13], SERCOM3/PAD[3], or TC5/WO[1].
25 PA27 bidirectional General-purpose I/O on VDDIO supply; EXTINT[15] or GCLK_IO[0].
26 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).
27 PA28 bidirectional General-purpose I/O on VDDIO supply; EXTINT[8] or GCLK_IO[0].
28 GND power_in Ground.
29 VDDCORE power_out Internal regulator output (1.2V) powering the core, memories, peripherals and DFLL48M; requires an external decoupling capacitor.
30 VDDIN power_in Input supply of 1.62V to 3.63V powering I/O lines and the internal voltage regulator.
31 PA30 bidirectional General-purpose I/O on VDDIO supply; EXTINT[10], SERCOM1/PAD[2], TC1/WO[0], GCLK_IO[0], or SWCLK serial wire debug clock (1 kΩ pull-up to VDD recommended).
32 PA31 bidirectional General-purpose I/O on VDDIO supply; EXTINT[11], SERCOM1/PAD[3], TC1/WO[1], or SWDIO serial wire debug data (active only when a debugger is present).
33 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package QFN-32-EP(5x5)
Category Embedded Processors & Controllers
Pins 33

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 VDD 1.62 3.63 V -40°C to +85°C, DC up to 48 MHz (also -40°C to +105°C, DC up to 32 MHz) 1
Operating supply voltage (VDDIO, VDDIN, VDDANA) VDD 1.62 3.63 V same voltage must be applied to VDDIN, VDDIO and VDDANA 27
Maximum CPU frequency 48 MHz 1.62V-3.63V, -40°C to +85°C 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
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. 551

CAD (KiCad official)

  • Symbol: ATSAMD20E18A-MN
  • Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • 3D model: QFN-32-EP(5x5) (KiCad packages3D, STEP)
  • 3D model files: atsamd20e18a-mn-etched.step / atsamd20e18a-mn-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamd20e18a-mn.step / atsamd20e18a-mn.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (731 pp, sha256 2505526f248dd8c2, 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