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ATTINY44A-MU

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Microchip Tech MICROCHIP, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentembedded processors & controllersattiny44a-mufactory-2.0.0extractor-text

Verified ATTINY44A-MU

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

Verification log 1 record

30 Oct 2026RayPublished by the parts factory: tier lcsc, 21 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATTINY44A-MU · QFN-20-EP(4x4) · 21 pins
  • ✓copper: 21 copper pads, none touching another net
  • ✓datasheet: all 21 pin names found in the 286-page datasheet
  • ✓distributor: lcsc C123718, digikey ATTINY44A-MU-ND, mouser 556-ATTINY44A-MU
  • ✓family: QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-u9ms0dcb/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.276)
  • ✓pads: 21 pins = 21 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 21 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ attiny44a-mu.kicad_sym✓ attiny44a-mu.kicad_mod✓ attiny44a-mu.step
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Ray Publish 0.1.0 483ecc1 5d ago

ATTINY44A-MU

Microchip Tech · MICROCHIP · QFN-20-EP(4x4)

ATTINY44A-MU from Microchip Tech, in a QFN-20-EP(4x4). 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 PA4 bidirectional Port A bit 4 with internal pull-up; alternate functions ADC4, USCK/SCL, T1, PCINT4.
2 PA3 bidirectional Port A bit 3 with internal pull-up; alternate functions ADC3, T0, PCINT3.
3 PA2 bidirectional Port A bit 2 with internal pull-up; alternate functions ADC2, AIN1, PCINT2.
4 PA1 bidirectional Port A bit 1 with internal pull-up; alternate functions ADC1, AIN0, PCINT1.
5 PA0 bidirectional Port A bit 0 with internal pull-up; alternate functions ADC0, AREF, PCINT0.
6 DNC unconnected Do Not Connect.
7 DNC unconnected Do Not Connect.
8 GND power_in Ground.
9 VCC power_in Supply voltage (1.8 - 5.5V operating range).
10 DNC unconnected Do Not Connect.
11 PB0 bidirectional Port B bit 0 with internal pull-up; alternate functions XTAL1/CLKI, PCINT8.
12 PB1 bidirectional Port B bit 1 with internal pull-up; alternate functions XTAL2, PCINT9.
13 PB3 input Port B bit 3 / active-low RESET input (low longer than minimum pulse length resets the device) and debugWIRE; usable as weak I/O if RSTDISBL fuse is programmed.
14 PB2 bidirectional Port B bit 2 with internal pull-up; alternate functions INT0, OC0A, CKOUT, PCINT10.
15 PA7 bidirectional Port A bit 7 with internal pull-up; alternate functions ICP, OC0B, ADC7, PCINT7.
16 PA6 bidirectional Port A bit 6 with internal pull-up; alternate functions OC1A, SDA/MOSI/DI, ADC6, PCINT6.
17 DNC unconnected Do Not Connect.
18 DNC unconnected Do Not Connect.
19 DNC unconnected Do Not Connect.
20 PA5 bidirectional Port A bit 5 with internal pull-up; alternate functions ADC5, DO/MISO, OC1B, PCINT5.
21 EP passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package QFN-20-EP(4x4)
Category Embedded Processors & Controllers
Pins 21

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 Temperature (Absolute Maximum) -55 125 °C 173
Storage Temperature -65 150 °C 173
Voltage on any Pin except RESET with respect to Ground -0.5 5 V -0.5V to VCC+0.5V 173
Voltage on RESET with respect to Ground -0.5 13 V 173
Maximum Operating Voltage 6 V 173
DC Current per I/O Pin 40 mA 173
DC Current VCC and GND Pins 200 mA 173
Input Low Voltage VIL -0.5 0.2 V VCC = 1.8V - 2.4V; max is 0.2VCC 173
Input Low Voltage VIL -0.5 0.3 V VCC = 2.4V - 5.5V; max is 0.3VCC 173
Input Low Voltage, RESET Pin as Reset VIL -0.5 0.2 V VCC = 1.8V - 5.5; max is 0.2VCC 173
Input High-voltage Except RESET pin VIH 0.7 0.5 V VCC = 1.8V - 2.4V; min 0.7VCC, max VCC+0.5 173
Input High-voltage Except RESET pin VIH 0.6 0.5 V VCC = 2.4V - 5.5V; min 0.6VCC, max VCC+0.5 173
Input High-voltage RESET pin as Reset VIH 0.9 0.5 V VCC = 1.8V to 5.5V; min 0.9VCC, max VCC+0.5 173
Output Low Voltage Except RESET pin VOL 0.6 V IOL = 10 mA, VCC = 5V 173
Output Low Voltage Except RESET pin VOL 0.5 V IOL = 5 mA, VCC = 3V 173
Output High-voltage Except RESET pin VOH 4.3 V IOH = -10 mA, VCC = 5V 173
Output High-voltage Except RESET pin VOH 2.5 V IOH = -5 mA, VCC = 3V 173
Input Leakage Current I/O Pin (pin low) ILIL 0.05 1 µA VCC = 5.5V, pin low (absolute value) 173
Input Leakage Current I/O Pin (pin high) ILIH 0.05 1 µA VCC = 5.5V, pin high (absolute value) 173
Pull-up Resistor, I/O Pin RPU 20 50 kΩ VCC = 5.5V, input low 173
Pull-up Resistor, Reset Pin RPU 30 60 kΩ VCC = 5.5V, input low 173
Supply Current, Active Mode ICC 0.25 0.5 mA f = 1 MHz, VCC = 2V 174
Supply Current, Active Mode ICC 1.2 2 mA f = 4 MHz, VCC = 3V 174
Supply Current, Active Mode ICC 4.4 7 mA f = 8 MHz, VCC = 5V 174
Supply Current, Idle Mode ICC 0.04 0.2 mA f = 1 MHz, VCC = 2V 174
Supply Current, Idle Mode ICC 0.25 0.6 mA f = 4 MHz, VCC = 3V 174
Supply Current, Idle Mode ICC 1.3 2 mA f = 8 MHz, VCC = 5V 174
Supply Current, Power-Down Mode ICC 4 10 µA WDT enabled, VCC = 3V 174
Supply Current, Power-Down Mode ICC 0.13 2 µA WDT disabled, VCC = 3V 174
Clock Frequency 1/tCLCL 0 4 MHz VCC = 1.8 - 5.5V 175
Clock Frequency 1/tCLCL 0 10 MHz VCC = 2.7 - 5.5V 175
Clock Frequency 1/tCLCL 0 20 MHz VCC = 4.5 - 5.5V 175
RESET pin threshold voltage VRST 0.2 0.9 V min 0.2VCC, max 0.9VCC 176
Brown-out Detector hysteresis VHYST 50 mV 176
Internal bandgap reference voltage VBG 1 1.1 1.2 V VCC = 5V, TA = 25°C 176
Release threshold of power-on reset VPOR 1.1 1.4 1.6 V TA = -40°C to +85°C 176
Activation threshold of power-on reset VPOA 0.6 1.3 1.6 V TA = -40°C to +85°C 176
Brown-out threshold VBOT 1.7 1.8 2 V BODLEVEL[2:0] = 110 176
Brown-out threshold VBOT 2.5 2.7 2.9 V BODLEVEL[2:0] = 101 176
Brown-out threshold VBOT 4.1 4.3 4.5 V BODLEVEL[2:0] = 100 176
Absolute accuracy single-ended 2 LSB VREF = 4V, VCC = 4V, ADC clock = 200 kHz 177
Operating Voltage VCC 1.8 5.5 V 1
Operating Temperature (Industrial) TA -40 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 , H: NiPdAu lead finish, F, N, U: matte tin 270

CAD (KiCad official)

  • Symbol: ATTINY44A-MU
  • Footprint: Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm
  • 3D model: QFN-20-EP(4x4) (KiCad packages3D, STEP)
  • 3D model files: attiny44a-mu-etched.step / attiny44a-mu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); attiny44a-mu.step / attiny44a-mu.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (286 pp, sha256 8a18a6b9f81ccee8, retrieved 2026-10-30, tier: lcsc)
  • 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