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ATMEGA168P-20MU

Public Made by Adom

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

componentembedded processors & controllersatmega168p-20mufactory-2.0.0extractor-text

Changed since verified ATMEGA168P-20MU

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

Verification log 1 record

30 Oct 2026RayPublished by the parts factory: tier mfr, 33 pinschanged since
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: ATMEGA168P-20MU · VQFN-32(5x5) · 33 pins
  • ✓copper: 33 copper pads, none touching another net
  • ✓datasheet: all 33 pin names found in the 436-page datasheet
  • ✓distributor: lcsc C1339206, digikey ATMEGA168P-20MU-ND, mouser 556-ATMEGA168P-20MU
  • ✓family: QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-lgzjm6f5/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
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Verified files! atmega168p-20mu.kicad_sym✓ atmega168p-20mu.kicad_mod✓ atmega168p-20mu.step
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ATMEGA168P-20MU

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

ATMEGA168P-20MU from Microchip Tech, in a VQFN-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 PD3 bidirectional Port D bit 3 is a bi-directional I/O pin with internal pull-up; it serves as external interrupt INT1 and as OC2B Timer/Counter2 compare output, which requires DDD3 to be set as output.
2 PD4 bidirectional Port D bit 4 is a bi-directional I/O pin with internal pull-up; it can serve as USART external clock XCK, Timer/Counter0 external counter input T0, or pin change interrupt PCINT20.
3 GND power_in Ground.
4 VCC power_in Digital supply voltage; the ATmega168P operating voltage is 2.7 - 5.5 V.
5 GND power_in Ground.
6 VCC power_in Digital supply voltage; the ATmega168P operating voltage is 2.7 - 5.5 V.
7 PB6 bidirectional Port B bit 6 is a bi-directional I/O pin with internal pull-up; when a crystal or external clock is selected it is used as XTAL1 oscillator input, and then cannot be used as an I/O pin.
8 PB7 bidirectional Port B bit 7 is a bi-directional I/O pin with internal pull-up; when a crystal clock is selected it is used as XTAL2 oscillator output, and then cannot be used as an I/O pin.
9 PD5 bidirectional Port D bit 5 is a bi-directional I/O pin with internal pull-up; it can serve as Timer/Counter1 external counter input T1, Timer/Counter0 compare output OC0B, or pin change interrupt PCINT21.
10 PD6 bidirectional Port D bit 6 is a bi-directional I/O pin with internal pull-up; as AIN0 it is the analog comparator positive input and should be configured as input with pull-up off, and it can also serve as OC0A output or PCINT22.
11 PD7 bidirectional Port D bit 7 is a bi-directional I/O pin with internal pull-up; as AIN1 it is the analog comparator negative input and should be configured as input with pull-up off, and it can also serve as PCINT23.
12 PB0 bidirectional Port B bit 0 is a bi-directional I/O pin with internal pull-up; it can serve as Timer/Counter1 input capture ICP1, divided system clock output CLKO, or pin change interrupt PCINT0.
13 PB1 (OC1A/PCINT1) bidirectional Port B bit 1 is a bi-directional I/O pin with internal pull-up; it can serve as Timer/Counter1 compare match A output OC1A, which requires DDB1 set as output, or pin change interrupt PCINT1.
14 PB2 (SS/OC1B/PCINT2) bidirectional Port B bit 2 is a bi-directional I/O pin with internal pull-up; it serves as SPI slave select SS (input when SPI is slave), Timer/Counter1 compare output OC1B, or pin change interrupt PCINT2.
15 PB3 (MOSI/OC2A/PCINT3) bidirectional Port B bit 3 is a bi-directional I/O pin with internal pull-up; it serves as SPI MOSI data line, Timer/Counter2 compare output OC2A, or pin change interrupt PCINT3.
16 PB4 (MISO/PCINT4) bidirectional Port B bit 4 is a bi-directional I/O pin with internal pull-up; it serves as SPI MISO data line or pin change interrupt PCINT4.
17 PB5 (SCK/PCINT5) bidirectional Port B bit 5 is a bi-directional I/O pin with internal pull-up; it serves as SPI clock SCK or pin change interrupt PCINT5.
18 AVCC power_in Supply voltage pin for the A/D converter, PC3:0 and ADC7:6; it should be connected to VCC even if the ADC is not used, and through a low-pass filter if the ADC is used.
19 ADC6 input Analog input channel 6 of the 10-bit ADC, powered from the analog supply (available in TQFP and QFN/MLF packages only).
20 AREF input Analog reference pin for the A/D converter.
21 GND power_in Ground.
22 ADC7 input Analog input channel 7 of the 10-bit ADC, powered from the analog supply (available in TQFP and QFN/MLF packages only).
23 PC0 (ADC0/PCINT8) bidirectional Port C bit 0 is a bi-directional I/O pin with internal pull-up that can also be used as ADC input channel 0 on analog power, or as pin change interrupt PCINT8.
24 PC1 (ADC1/PCINT9) bidirectional Port C bit 1 is a bi-directional I/O pin with internal pull-up that can also be used as ADC input channel 1 on analog power, or as pin change interrupt PCINT9.
25 PC2 (ADC2/PCINT10) bidirectional Port C bit 2 is a bi-directional I/O pin with internal pull-up that can also be used as ADC input channel 2 on analog power, or as pin change interrupt PCINT10.
26 PC3 (ADC3/PCINT11) bidirectional Port C bit 3 is a bi-directional I/O pin with internal pull-up that can also be used as ADC input channel 3 on analog power, or as pin change interrupt PCINT11.
27 PC4 (ADC4/SDA/PCINT12) bidirectional Port C bit 4 is a bi-directional I/O pin with internal pull-up; when TWEN is set it is the 2-wire serial data line SDA, and it can also be ADC input channel 4 on digital power or PCINT12.
28 PC5 (ADC5/SCL/PCINT13) bidirectional Port C bit 5 is a bi-directional I/O pin with internal pull-up; when TWEN is set it is the 2-wire serial clock line SCL, and it can also be ADC input channel 5 on digital power or PCINT13.
29 PC6 (RESET/PCINT14) bidirectional With the RSTDISBL fuse unprogrammed, PC6 is the reset input and a low level longer than the minimum pulse length (Table 29-3) generates a reset, while with RSTDISBL programmed it is a normal I/O pin (or PCINT14).
30 PD0 (RXD/PCINT16) bidirectional Port D bit 0 is a bi-directional I/O pin with internal pull-up; when the USART receiver is enabled it is the receive data input RXD, or it can serve as PCINT16.
31 PD1 (TXD/PCINT17) bidirectional Port D bit 1 is a bi-directional I/O pin with internal pull-up; when the USART transmitter is enabled it is the transmit data output TXD regardless of DDD1, or it can serve as PCINT17.
32 PD2 (INT0/PCINT18) bidirectional Port D bit 2 is a bi-directional I/O pin with internal pull-up; it can serve as external interrupt source INT0 or pin change interrupt PCINT18.
33 GND passive Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package VQFN-32(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 Temperature -55 125 °C 324
Storage Temperature -65 150 °C 324
Voltage on any pin except RESET -0.5 V with respect to Ground; max printed as VCC+0.5V 324
Voltage on RESET -0.5 13 V with respect to Ground 324
Maximum Operating Voltage 6 V 324
DC Current per I/O Pin 40 mA 324
DC Current VCC and GND Pins 200 mA 324
Input Low Voltage, except XTAL1 and RESET pin VIL -0.5 V VCC = 2.4V - 5.5V; max printed as 0.3VCC 324
Input Low Voltage, XTAL1 pin VIL1 -0.5 V VCC = 1.8V - 5.5V; max printed as 0.1VCC 324
Input Low Voltage, RESET pin VIL2 -0.5 V VCC = 1.8V - 5.5V; max printed as 0.1VCC 324
Input Low Voltage, RESET pin as I/O VIL3 -0.5 V VCC = 2.4V - 5.5V; max printed as 0.3VCC 324
Output Low Voltage (except RESET pin) VOL 0.9 V IOL = 20 mA, VCC = 5V 324
Output Low Voltage (except RESET pin) VOL 0.6 V IOL = 10 mA, VCC = 3V 324
Output High Voltage (except Reset pin) VOH 4.2 V IOH = -20 mA, VCC = 5V 324
Output High Voltage (except Reset pin) VOH 2.3 V IOH = -10 mA, VCC = 3V 324
Input Leakage Current I/O Pin, pin low IIL 1 µA VCC = 5.5V, pin low (absolute value) 324
Input Leakage Current I/O Pin, pin high IIH 1 µA VCC = 5.5V, pin high (absolute value) 324
Reset Pull-up Resistor RRST 30 60 k 325
I/O Pin Pull-up Resistor RPU 20 50 k 325
Analog Comparator Input Offset Voltage VACIO 40 mV VCC = 5V, Vin = VCC/2 325
Analog Comparator Input Leakage Current IACLK -50 50 nA VCC = 5V, Vin = VCC/2 325
Analog Comparator Propagation Delay tACID 750 ns VCC = 2.7V 325
Analog Comparator Propagation Delay tACID 500 ns VCC = 4.0V 325
Power Supply Current, Active mode ICC 1.8 2.5 mA Active 4 MHz, VCC = 3V 327
Power Supply Current, Active mode ICC 6.7 9 mA Active 8 MHz, VCC = 5V 327
Power Supply Current, Idle mode ICC 0.4 0.7 mA Idle 4 MHz, VCC = 3V 327
Power Supply Current, Idle mode ICC 1.7 2.7 mA Idle 8 MHz, VCC = 5V 327
Power Supply Current, Power-save mode ICC 0.9 2.6 µA 32 kHz TOSC enabled, VCC = 3V 327
Power Supply Current, Power-down mode ICC 4.6 8 µA WDT enabled, VCC = 3V 327
Power Supply Current, Power-down mode ICC 0.1 2 µA WDT disabled, VCC = 3V 327
External Clock Oscillator Frequency 1/tCLCL 0 10 MHz VCC = 2.7-5.5V 329
External Clock Period tCLCL 100 ns VCC = 2.7-5.5V 329
External Clock High Time tCHCX 40 ns VCC = 2.7-5.5V 329
External Clock Low Time tCLCX 40 ns VCC = 2.7-5.5V 329
External Clock Rise Time tCLCH 1.6 µs VCC = 2.7-5.5V 329
External Clock Fall Time tCHCL 1.6 µs VCC = 2.7-5.5V 329
Change in period from one clock cycle to the next tCLCL 2 % VCC = 2.7-5.5V 329
Calibrated Internal RC Oscillator accuracy, factory calibration -10 10 % 8.0 MHz, VCC = 3V, 25C 329
Calibrated Internal RC Oscillator accuracy, user calibration -1 1 % VCC = 2.7-5.5V, -40C to 85C 329
Power-on Reset Threshold Voltage (rising) VPOT 1.1 1.4 1.6 V 330
Power-on Reset Threshold Voltage (falling) VPOT 0.6 1.3 1.6 V 330
Power-on Slope Rate SRON 0.01 10 V/ms 330
Minimum pulse width on RESET Pin tRST 2.5 µs 330
Brown-out Detection threshold VBOT, BODLEVEL 110 VBOT 1.7 1.8 2 V BODLEVEL = 110 330
Brown-out Detection threshold VBOT, BODLEVEL 101 VBOT 2.5 2.7 2.9 V BODLEVEL = 101 330
Brown-out Detection threshold VBOT, BODLEVEL 100 VBOT 4.1 4.3 4.5 V BODLEVEL = 100 330
Min Pulse Width on Brown-out Reset tBOD 2 µs 330
Bandgap reference voltage VBG 1 1.1 1.2 V VCC = 2.7, TA = 25°C 330
Bandgap reference start-up time tBG 40 70 µs VCC = 2.7, TA = 25°C 330
ADC clock frequency 50 1000 kHz 335
ADC conversion time 13 260 µs Free Running Conversion 335
Internal Voltage Reference VINT 1 1.1 1.2 V 335
ADC absolute accuracy 2 LSB VREF = 4V, VCC = 4V, ADC clock = 200 kHz 335
ADC absolute accuracy 4.5 LSB VREF = 4V, VCC = 4V, ADC clock = 1 MHz 335
Brown-out Detector Hysteresis VHYST 50 mV 330
Bandgap reference current consumption IBG 10 µA VCC = 2.7, TA = 25°C 330

CAD (KiCad official)

  • Symbol: ATMEGA168P-20MU
  • Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
  • 3D model: VQFN-32(5x5) (KiCad packages3D, STEP)
  • 3D model files: atmega168p-20mu-etched.step / atmega168p-20mu-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); atmega168p-20mu.step / atmega168p-20mu.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (436 pp, sha256 aab081a362918ab9, 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