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ATSAMC21E18A-MUT

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

componentsingle chip microcomputer-microcontrolleratsamc21e18a-mutfactory-2.0.0extractor-text

Verified ATSAMC21E18A-MUT

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: ATSAMC21E18A-MUT · QFN-32-EP(5x5) · 33 pins
  • ✓copper: 33 copper pads, none touching another net
  • ✓datasheet: all 33 pin names found in the 1206-page datasheet
  • ✓distributor: lcsc C2053333, digikey ATSAMC21E18A-MUTTR-ND, mouser 556-ATSAMC21E18A-MUT
  • ✓family: QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-ba51n56t/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.1171)
  • ✓pads: 33 pins = 33 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 33 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ atsamc21e18a-mut.kicad_sym✓ atsamc21e18a-mut.kicad_mod✓ atsamc21e18a-mut.step
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Contents

README

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ATSAMC21E18A-MUT

Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · QFN-32-EP(5x5)

ATSAMC21E18A-MUT 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 PA00 on the VDDANA domain, also usable as XIN32 (32.768 kHz crystal input) and EXTINT[0], SERCOM1/PAD[0], TCC2/WO[0] and CMP[2] per the multiplexing tables.
2 PA01 bidirectional General-purpose I/O PA01 on the VDDANA domain, also usable as XOUT32 (32.768 kHz crystal output) and EXTINT[1], SERCOM1/PAD[1], TCC2/WO[1] and CMP[3].
3 PA02 bidirectional General-purpose I/O PA02 on the VDDANA domain, also usable as analog input AIN[0] and AIN[4], PTC Y[0], DAC output VOUT and EXTINT[2].
4 PA03 bidirectional General-purpose I/O PA03 on the VDDANA domain, also usable as analog input AIN[1] and AIN[5], PTC Y[1], ADC/DAC reference VREFA and EXTINT[3].
5 PA04 bidirectional General-purpose I/O PA04 on the VDDANA domain, also usable as analog input AIN[4]/AIN[0], SDADC reference VREFB, PTC Y[2], SERCOM0/PAD[0], TCC0/WO[0] and EXTINT[4].
6 PA05 bidirectional General-purpose I/O PA05 on the VDDANA domain, also usable as analog input AIN[5]/AIN[1], PTC Y[3], SERCOM0/PAD[1], TCC0/WO[1] and EXTINT[5].
7 PA06 bidirectional General-purpose I/O PA06 on the VDDANA domain, also usable as analog input AIN[6]/AIN[2], negative SDADC input AINN[0], PTC Y[4], SERCOM0/PAD[2], TCC1/WO[0] and EXTINT[6].
8 PA07 bidirectional General-purpose I/O PA07 on the VDDANA domain, also usable as analog input AIN[7]/AIN[3], positive SDADC input AINP[0], PTC Y[5], SERCOM0/PAD[3], TCC1/WO[1] and EXTINT[7].
9 VDDANA power_in Analog supply input for the VDDANA pin domain, with the device operating range stated as 2.7 V to 5.5 V.
10 GND power_in Ground reference pin of the device.
11 PA08 bidirectional General-purpose I/O PA08 on the VDDIO domain, also usable as NMI, analog input AIN[8], PTC X[0]/Y[16], SERCOM0/PAD[0], SERCOM2/PAD[0], TCC0/WO[0] and CCL1/IN[3]; one of the 32-pin SERCOM I2C-capable pins.
12 PA09 bidirectional General-purpose I/O PA09 on the VDDIO domain, also usable as EXTINT[9], analog input AIN[9], PTC X[1]/Y[17], SERCOM0/PAD[1], SERCOM2/PAD[1], TCC0/WO[1] and CCL1/IN[4]; one of the 32-pin SERCOM I2C-capable pins.
13 PA10 bidirectional General-purpose I/O PA10 on the VDDIO domain, also usable as EXTINT[10], analog input AIN[10], PTC X[2]/Y[18], SERCOM0/PAD[2], SERCOM2/PAD[2], TCC1/WO[0], TCC0/WO[2] and GCLK_IO[4].
14 PA11 bidirectional General-purpose I/O PA11 on the VDDIO domain, also usable as EXTINT[11], analog input AIN[11], PTC X[3]/Y[19], SERCOM0/PAD[3], SERCOM2/PAD[3], TCC1/WO[1], TCC0/WO[3] and GCLK_IO[5].
15 PA14 bidirectional General-purpose I/O PA14 on the VDDIO domain, also usable as XIN (0.4-32 MHz crystal oscillator input), EXTINT[14], SERCOM2/PAD[2], SERCOM4/PAD[2], TC4/WO[0], TCC0/WO[4] and GCLK_IO[0].
16 PA15 bidirectional General-purpose I/O PA15 on the VDDIO domain, also usable as XOUT (0.4-32 MHz crystal oscillator output), EXTINT[15], SERCOM2/PAD[3], SERCOM4/PAD[3], TC4/WO[1], TCC0/WO[5] and GCLK_IO[1].
17 PA16 bidirectional General-purpose I/O PA16 on the VDDIO domain, also usable as EXTINT[0], PTC X[4]/Y[20], SERCOM1/PAD[0], SERCOM3/PAD[0], TCC2/WO[0], TCC0/WO[6], GCLK_IO[2] and CCL0/IN[0]; one of the 32-pin SERCOM I2C-capable pins.
18 PA17 bidirectional General-purpose I/O PA17 on the VDDIO domain, also usable as EXTINT[1], PTC X[5]/Y[21], SERCOM1/PAD[1], SERCOM3/PAD[1], TCC2/WO[1], TCC0/WO[7], GCLK_IO[3] and CCL0/IN[1]; one of the 32-pin SERCOM I2C-capable pins.
19 PA18 bidirectional General-purpose I/O PA18 on the VDDIO domain, also usable as EXTINT[2], PTC X[6]/Y[22], SERCOM1/PAD[2], SERCOM3/PAD[2], TC4/WO[0], TCC0/WO[2], AC/CMP[0] and CCL0/IN[2].
20 PA19 bidirectional General-purpose I/O PA19 on the VDDIO domain, also usable as EXTINT[3], PTC X[7]/Y[23], SERCOM1/PAD[3], SERCOM3/PAD[3], TC4/WO[1], TCC0/WO[3], AC/CMP[1] and CCL0/OUT[0].
21 PA22 bidirectional General-purpose I/O PA22 on the VDDIO domain, also usable as EXTINT[6], PTC X[10]/Y[26], SERCOM3/PAD[0], SERCOM5/PAD[0], TC0/WO[0], TCC0/WO[4], GCLK_IO[6] and CCL2/IN[6]; one of the 32-pin SERCOM I2C-capable pins.
22 PA23 bidirectional General-purpose I/O PA23 on the VDDIO domain, also usable as EXTINT[7], PTC X[11]/Y[27], SERCOM3/PAD[1], SERCOM5/PAD[1], TC0/WO[1], TCC0/WO[5], GCLK_IO[7] and CCL2/IN[7]; one of the 32-pin SERCOM I2C-capable pins.
23 PA24 bidirectional General-purpose I/O PA24 on the VDDIO domain, also usable as EXTINT[12], SERCOM3/PAD[2], SERCOM5/PAD[2], TC1/WO[0], TCC1/WO[2], CAN0/TX, AC/CMP[2] and CCL2/IN[8].
24 PA25 bidirectional General-purpose I/O PA25 on the VDDIO domain, also usable as EXTINT[13], SERCOM3/PAD[3], SERCOM5/PAD[3], TC1/WO[1], TCC1/WO[3], CAN0/RX, AC/CMP[3] and CCL2/OUT[2].
25 PA27 bidirectional General-purpose I/O PA27 on the VDDIN domain, also usable as EXTINT[15] and GCLK_IO[0].
26 RESET input External active-low reset input (RESET pin) of the device.
27 PA28 bidirectional General-purpose I/O PA28 on the VDDIN domain, also usable as EXTINT[8] and GCLK_IO[0].
28 GND power_in Ground reference pin of the device.
29 VDDCORE power_out Regulated output supply of the internal voltage regulator that feeds the core domain.
30 VDDIN power_in Input supply for the VDDIN pin domain (PA27, PA28, PA30, PA31), with the device operating range stated as 2.7 V to 5.5 V.
31 PA30 bidirectional General-purpose I/O PA30 on the VDDIN domain, also usable as the SWCLK Serial Wire Debug clock, EXTINT[10], SERCOM1/PAD[2], TCC1/WO[0], GCLK_IO[0] and CCL1/IN[3].
32 PA31 bidirectional General-purpose I/O PA31 on the VDDIN domain, also usable as the SWDIO Serial Wire Debug data pin, EXTINT[11], SERCOM1/PAD[3], TCC1/WO[1] and CCL1/OUT[1].
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 Single Chip Microcomputer/Microcontroller
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
I/O supply voltage (VDDIO) VDDIO 2.7 5.5 V Powers I/O lines and XOSC; must be less than or equal to VDDIN 38
Input supply voltage (VDDIN) VDDIN 2.7 5.5 V Powers I/O lines, OSC48M, TOSC and internal regulator; same voltage as VDDANA (VDD) 38
Analog supply voltage (VDDANA) VDDANA 2.7 5.5 V Powers I/O lines, ADC, AC, DAC, PTC, SDADC, OSCULP32K, OSC32K, XOSC32K; same voltage as VDDIN (VDD) 38
Operating temperature range, grade U -40 85 °C Ordering code grade U = -40 to 85 °C Matte Sn plating 18

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: ATSAMC21E18A-MUT
  • 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: atsamc21e18a-mut-etched.step / atsamc21e18a-mut-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atsamc21e18a-mut.step / atsamc21e18a-mut.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 2026-10-30, 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