component
ATMEGA168P-20MU
Public Made by Adomby adom
Microchip Tech Pre-ordered MCUs, VQFN-32(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "atmega168p-20mu",
"title": "ATMEGA168P-20MU",
"brief": "Microchip Tech Pre-ordered MCUs, VQFN-32(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
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"embedded processors & controllers",
"atmega168p-20mu",
"factory-2.0.0",
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"component": {
"mpn": "ATMEGA168P-20MU",
"manufacturer": "Microchip Tech",
"package": "VQFN-32(5x5)",
"pin_count": 33,
"category": "Embedded Processors & Controllers",
"subcategory": "Pre-ordered MCUs",
"datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/ATmega48P_88P_168P-DS40002065A.pdf",
"parts": {
"symbol": "atmega168p-20mu.kicad_sym",
"footprint": "atmega168p-20mu.kicad_mod",
"model_3d": "atmega168p-20mu-hero.glb",
"model_3d_plain": "atmega168p-20mu-etched.glb",
"model_3d_step": "atmega168p-20mu-etched.step",
"model_3d_step_plain": "atmega168p-20mu.step",
"lbr": "atmega168p-20mu.lbr"
},
"distributor_links": {
"lcsc": "C1339206",
"digikey": "ATMEGA168P-20MU-ND",
"mouser": "556-ATMEGA168P-20MU"
},
"distributor_check": {
"checked_at": "2026-10-30T22:08:34Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "ATMEGA168P-20MU-ND",
"status": "found"
},
"mouser": {
"pn": "556-ATMEGA168P-20MU",
"status": "found",
"lifecycle": "Not Recommended for New Designs"
}
},
"pins": [
{
"number": "1",
"name": "PD3",
"type": "bidirectional",
"description": "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."
},
{
"number": "2",
"name": "PD4",
"type": "bidirectional",
"description": "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."
},
{
"number": "3",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "4",
"name": "VCC",
"type": "power_in",
"description": "Digital supply voltage; the ATmega168P operating voltage is 2.7 - 5.5 V."
},
{
"number": "5",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "6",
"name": "VCC",
"type": "power_in",
"description": "Digital supply voltage; the ATmega168P operating voltage is 2.7 - 5.5 V."
},
{
"number": "7",
"name": "PB6",
"type": "bidirectional",
"description": "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."
},
{
"number": "8",
"name": "PB7",
"type": "bidirectional",
"description": "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."
},
{
"number": "9",
"name": "PD5",
"type": "bidirectional",
"description": "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."
},
{
"number": "10",
"name": "PD6",
"type": "bidirectional",
"description": "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."
},
{
"number": "11",
"name": "PD7",
"type": "bidirectional",
"description": "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."
},
{
"number": "12",
"name": "PB0",
"type": "bidirectional",
"description": "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."
},
{
"number": "13",
"name": "PB1 (OC1A/PCINT1)",
"type": "bidirectional",
"description": "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."
},
{
"number": "14",
"name": "PB2 (SS/OC1B/PCINT2)",
"type": "bidirectional",
"description": "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."
},
{
"number": "15",
"name": "PB3 (MOSI/OC2A/PCINT3)",
"type": "bidirectional",
"description": "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."
},
{
"number": "16",
"name": "PB4 (MISO/PCINT4)",
"type": "bidirectional",
"description": "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."
},
{
"number": "17",
"name": "PB5 (SCK/PCINT5)",
"type": "bidirectional",
"description": "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."
},
{
"number": "18",
"name": "AVCC",
"type": "power_in",
"description": "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."
},
{
"number": "19",
"name": "ADC6",
"type": "input",
"description": "Analog input channel 6 of the 10-bit ADC, powered from the analog supply (available in TQFP and QFN/MLF packages only)."
},
{
"number": "20",
"name": "AREF",
"type": "input",
"description": "Analog reference pin for the A/D converter."
},
{
"number": "21",
"name": "GND",
"type": "power_in",
"description": "Ground."
},
{
"number": "22",
"name": "ADC7",
"type": "input",
"description": "Analog input channel 7 of the 10-bit ADC, powered from the analog supply (available in TQFP and QFN/MLF packages only)."
},
{
"number": "23",
"name": "PC0 (ADC0/PCINT8)",
"type": "bidirectional",
"description": "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."
},
{
"number": "24",
"name": "PC1 (ADC1/PCINT9)",
"type": "bidirectional",
"description": "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."
},
{
"number": "25",
"name": "PC2 (ADC2/PCINT10)",
"type": "bidirectional",
"description": "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."
},
{
"number": "26",
"name": "PC3 (ADC3/PCINT11)",
"type": "bidirectional",
"description": "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."
},
{
"number": "27",
"name": "PC4 (ADC4/SDA/PCINT12)",
"type": "bidirectional",
"description": "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."
},
{
"number": "28",
"name": "PC5 (ADC5/SCL/PCINT13)",
"type": "bidirectional",
"description": "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."
},
{
"number": "29",
"name": "PC6 (RESET/PCINT14)",
"type": "bidirectional",
"description": "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)."
},
{
"number": "30",
"name": "PD0 (RXD/PCINT16)",
"type": "bidirectional",
"description": "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."
},
{
"number": "31",
"name": "PD1 (TXD/PCINT17)",
"type": "bidirectional",
"description": "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."
},
{
"number": "32",
"name": "PD2 (INT0/PCINT18)",
"type": "bidirectional",
"description": "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."
},
{
"number": "33",
"name": "GND",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: Package mapping: ATMEGA168P-20MU is ordered in the 32M1-A package (32-pad, 5 x 5 x 1.0 mm QFN/MLF), ; The bottom exposed pad is not a numbered pin. The datasheet says it should be soldered to ground, so; PC6 type is ambiguous. It is a reset input when the RSTDISBL fuse is unprogrammed and a bidirectiona",
"exposed pad 33 added from the footprint",
"16/33 pins cited to the wrong page (name found elsewhere): ['4:VCC@p2', '6:VCC@p2', '8:PB7 (XTAL2/TOSC2/PCINT7)@p92', '12:PB0 (ICP1/CLKO/PCINT0)@p92']"
],
"pages_sent": 76,
"cost_usd": 0.2781,
"at": "2026-10-30T22:08:19"
},
"datasheet": {
"url": "https://ww1.microchip.com/downloads/en/DeviceDoc/ATmega48P_88P_168P-DS40002065A.pdf",
"pages": 436,
"sha256": "aab081a362918ab9",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 33,
"described": 33,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
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"file": "atmega168p-20mu.step",
"role": "plain",
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"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "atmega168p-20mu-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
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"seat": "z = 0",
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"footprint_binding": "identity",
"sha256": "ee8d18c32c81455158ae98780473d51c641b4800a41839f149a11e974525c5ed",
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}
]
},
"metadata": {
"specs": {
"Manufacturer": "Microchip Tech",
"Package": "VQFN-32(5x5)",
"Category": "Embedded Processors & Controllers",
"Pins": "33"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "aab081a362918ab9013267cab3ee10a06ca2231f4c1ae48d3cdb329c0f95f524",
"rows": [
{
"name": "Operating Temperature",
"symbol": "",
"kind": "absolute_maximum",
"unit": "°C",
"min": -55,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Storage Temperature",
"symbol": "",
"kind": "absolute_maximum",
"unit": "°C",
"min": -65,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Voltage on any pin except RESET",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": null,
"conditions": "with respect to Ground; max printed as VCC+0.5V",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Voltage on RESET",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 13,
"conditions": "with respect to Ground",
"source_page": 324,
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{
"name": "Maximum Operating Voltage",
"symbol": "",
"kind": "absolute_maximum",
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"min": null,
"typ": null,
"max": 6,
"conditions": "",
"source_page": 324,
"source": "datasheet"
},
{
"name": "DC Current per I/O Pin",
"symbol": "",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 40,
"conditions": "",
"source_page": 324,
"source": "datasheet"
},
{
"name": "DC Current VCC and GND Pins",
"symbol": "",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 200,
"conditions": "",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Input Low Voltage, except XTAL1 and RESET pin",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": null,
"conditions": "VCC = 2.4V - 5.5V; max printed as 0.3VCC",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Input Low Voltage, XTAL1 pin",
"symbol": "VIL1",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": null,
"conditions": "VCC = 1.8V - 5.5V; max printed as 0.1VCC",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Input Low Voltage, RESET pin",
"symbol": "VIL2",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": null,
"conditions": "VCC = 1.8V - 5.5V; max printed as 0.1VCC",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Input Low Voltage, RESET pin as I/O",
"symbol": "VIL3",
"kind": "electrical",
"unit": "V",
"min": -0.5,
"typ": null,
"max": null,
"conditions": "VCC = 2.4V - 5.5V; max printed as 0.3VCC",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Output Low Voltage (except RESET pin)",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.9,
"conditions": "IOL = 20 mA, VCC = 5V",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Output Low Voltage (except RESET pin)",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.6,
"conditions": "IOL = 10 mA, VCC = 3V",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Output High Voltage (except Reset pin)",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 4.2,
"typ": null,
"max": null,
"conditions": "IOH = -20 mA, VCC = 5V",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Output High Voltage (except Reset pin)",
"symbol": "VOH",
"kind": "electrical",
"unit": "V",
"min": 2.3,
"typ": null,
"max": null,
"conditions": "IOH = -10 mA, VCC = 3V",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Input Leakage Current I/O Pin, pin low",
"symbol": "IIL",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 1,
"conditions": "VCC = 5.5V, pin low (absolute value)",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Input Leakage Current I/O Pin, pin high",
"symbol": "IIH",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": null,
"max": 1,
"conditions": "VCC = 5.5V, pin high (absolute value)",
"source_page": 324,
"source": "datasheet"
},
{
"name": "Reset Pull-up Resistor",
"symbol": "RRST",
"kind": "electrical",
"unit": "k",
"min": 30,
"typ": null,
"max": 60,
"conditions": "",
"source_page": 325,
"source": "datasheet"
},
{
"name": "I/O Pin Pull-up Resistor",
"symbol": "RPU",
"kind": "electrical",
"unit": "k",
"min": 20,
"typ": null,
"max": 50,
"conditions": "",
"source_page": 325,
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},
{
"name": "Analog Comparator Input Offset Voltage",
"symbol": "VACIO",
"kind": "electrical",
"unit": "mV",
"min": null,
"typ": null,
"max": 40,
"conditions": "VCC = 5V, Vin = VCC/2",
"source_page": 325,
"source": "datasheet"
},
{
"name": "Analog Comparator Input Leakage Current",
"symbol": "IACLK",
"kind": "electrical",
"unit": "nA",
"min": -50,
"typ": null,
"max": 50,
"conditions": "VCC = 5V, Vin = VCC/2",
"source_page": 325,
"source": "datasheet"
},
{
"name": "Analog Comparator Propagation Delay",
"symbol": "tACID",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": null,
"max": 750,
"conditions": "VCC = 2.7V",
"source_page": 325,
"source": "datasheet"
},
{
"name": "Analog Comparator Propagation Delay",
"symbol": "tACID",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": null,
"max": 500,
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