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ATMEGA8U2-MU

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MICROCHIP TECHNOLOGY Global Sourcing Parts, QFN-32(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentglobal sourcing partsatmega8u2-mufactory-2.0.0extractor-text

Verified ATMEGA8U2-MU

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, 33 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATMEGA8U2-MU · QFN-32(5x5) · 33 pins
  • ✓copper: 33 copper pads, none touching another net
  • ✓datasheet: all 33 pin names found in the 22-page datasheet
  • ✓distributor: lcsc C111447, digikey ATMEGA8U2-MU-ND, mouser 556-ATMEGA8U2-MU
  • ✓family: QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-2v747oqq/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: 33 pins = 33 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 33 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ atmega8u2-mu.kicad_sym✓ atmega8u2-mu.kicad_mod✓ atmega8u2-mu.step
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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs Publish 0.1.0 · Ray 2d ago
viewers atmega8u2-mu: viewers · Ray 2d ago
atmega8u2-mu-etched.glb Publish 0.1.0 · Ray 2d ago
atmega8u2-mu-etched.step atmega8u2-mu: factory component page (tier=mfr) · Ray 2d ago
atmega8u2-mu-hero.glb atmega8u2-mu: hero GLB from the etched model (keeps the MPN mark) · Ray 2d ago
atmega8u2-mu-hero.overlay.json Publish 0.1.0 · Ray 2d ago
atmega8u2-mu.glb Publish 0.1.0 · Ray 2d ago
atmega8u2-mu.kicad_mod Publish 0.1.0 · Ray 2d ago
atmega8u2-mu.kicad_sym Publish 0.1.0 · Ray 2d ago
atmega8u2-mu.lbr Publish 0.1.0 · Ray 2d ago
atmega8u2-mu.step Publish 0.1.0 · Ray 2d ago
package.json Publish 0.1.0 · Ray 2d ago
page.json Set visibility: public · Ray 2d ago
README.md Publish 0.1.0 · Ray 2d ago
verification.json Verified: Published by the parts factory: tier mfr, 33 pins · Ray 2d ago

ATMEGA8U2-MU

MICROCHIP TECHNOLOGY · Global Sourcing Parts · QFN-32(5x5)

ATMEGA8U2-MU from MICROCHIP TECHNOLOGY, in a QFN-32(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 XTAL1 input Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
2 XTAL2/PC0 bidirectional Output from the inverting oscillator amplifier if enabled by fuse, also serves as generic I/O port pin PC0.
3 GND power_in Ground.
4 VCC power_in Digital supply voltage.
5 PC2 bidirectional Port C bit 2 bi-directional I/O with internal pull-up, alternate functions PCINT11 and AIN2.
6 PD0 bidirectional Port D bit 0 bi-directional I/O with internal pull-up, alternate functions OC.0B and INT0.
7 PD1 bidirectional Port D bit 1 bi-directional I/O with internal pull-up, alternate functions AIN0 (analog comparator input) and INT1.
8 PD2 bidirectional Port D bit 2 bi-directional I/O with internal pull-up, alternate functions RXD1, AIN1 (analog comparator input) and INT2.
9 PD3 bidirectional Port D bit 3 bi-directional I/O with internal pull-up, alternate functions TXD1 and INT3.
10 PD4 bidirectional Port D bit 4 bi-directional I/O with internal pull-up, alternate functions INT5 and AIN3 (analog comparator input).
11 PD5 bidirectional Port D bit 5 bi-directional I/O with internal pull-up, alternate functions XCK, AIN4 (analog comparator input) and PCINT12.
12 PD6 bidirectional Port D bit 6 bi-directional I/O with internal pull-up, alternate functions RTS, AIN5 (analog comparator input) and INT6.
13 PD7 bidirectional Port D bit 7 bi-directional I/O with internal pull-up, alternate functions CTS, HWB, AIN6 (analog comparator input), T0 and INT7.
14 PB0 bidirectional Port B bit 0 bi-directional I/O with internal pull-up, alternate functions SS and PCINT0.
15 PB1 bidirectional Port B bit 1 bi-directional I/O with internal pull-up, alternate functions SCLK and PCINT1.
16 PB2 bidirectional Port B bit 2 bi-directional I/O with internal pull-up, alternate functions PDI, MOSI and PCINT2.
17 PB3 bidirectional Port B bit 3 bi-directional I/O with internal pull-up, alternate functions PDO, MISO and PCINT3.
18 PB4 bidirectional Port B bit 4 bi-directional I/O with internal pull-up, alternate functions T1 and PCINT4.
19 PB5 bidirectional Port B bit 5 bi-directional I/O with internal pull-up, alternate function PCINT5.
20 PB6 bidirectional Port B bit 6 bi-directional I/O with internal pull-up, alternate function PCINT6.
21 PB7 bidirectional Port B bit 7 bi-directional I/O with internal pull-up, alternate functions PCINT7, OC.0A and OC.1C.
22 PC7 bidirectional Port C bit 7 bi-directional I/O with internal pull-up, alternate functions INT4, ICP1 and CLKO.
23 PC6 bidirectional Port C bit 6 bi-directional I/O with internal pull-up, alternate functions OC.1A and PCINT8.
24 RESET/PC1/dW input Reset input where a low level longer than the minimum pulse length generates a reset even if the clock is not running, alternatively serving as debugWire channel or generic I/O depending on fuses RSTDISBL and DWEN.
25 PC5 bidirectional Port C bit 5 bi-directional I/O with internal pull-up, alternate functions PCINT9 and OC.1B.
26 PC4 bidirectional Port C bit 4 bi-directional I/O with internal pull-up, alternate function PCINT10.
27 UCAP power_out USB pads internal regulator output supply voltage, to be connected to an external 1 µF capacitor.
28 UGND power_in USB ground.
29 D+ bidirectional USB full speed positive data upstream port.
30 D- bidirectional USB full speed negative data upstream port.
31 UVCC power_in USB pads internal regulator input supply voltage.
32 AVCC power_in Supply voltage input for all analog features (analog comparator, PLL), to be externally connected to VCC through a low-pass filter.
33 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer MICROCHIP TECHNOLOGY
Package QFN-32(5x5)
Category Global Sourcing Parts
Pins 33

CAD (KiCad official)

  • Symbol: ATMEGA8U2-MU
  • Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • 3D model: QFN-32(5x5) (KiCad packages3D, STEP)
  • 3D model files: atmega8u2-mu-etched.step / atmega8u2-mu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega8u2-mu.step / atmega8u2-mu.glb are the bare package body.

Provenance

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

  • Datasheet: MICROCHIP TECHNOLOGY datasheet (22 pp, sha256 78639455b8b6b4e8, retrieved 2026-11-02, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), 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