component
ATMEGA328PB-MU
Public Made by Adomby adom
Microchip Tech MICROCHIP, QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
Ray
Publish 0.1.1
823b8fd
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{
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"slug": "atmega328pb-mu",
"title": "ATMEGA328PB-MU",
"brief": "Microchip Tech MICROCHIP, QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.1",
"license": "CC-BY-SA-4.0",
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"component": {
"mpn": "ATMEGA328PB-MU",
"manufacturer": "Microchip Tech",
"package": "QFN-32-EP(5x5)",
"pin_count": 33,
"category": "Embedded Processors & Controllers",
"subcategory": "MICROCHIP",
"datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/40001907A.pdf",
"parts": {
"symbol": "atmega328pb-mu.kicad_sym",
"footprint": "atmega328pb-mu.kicad_mod",
"model_3d": "atmega328pb-mu-hero.glb",
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"lbr": "atmega328pb-mu.lbr"
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"distributor_links": {
"lcsc": "C967933",
"digikey": "ATMEGA328PB-MU-ND",
"mouser": "556-ATMEGA328PB-MU"
},
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"source": "Component Ocean /api/assign-pns",
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"pn": "ATMEGA328PB-MU-ND",
"status": "found"
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},
"pins": [
{
"number": "1",
"name": "PD[3]",
"type": "bidirectional",
"description": "Port D bit 3 is a bidirectional I/O pin with internal pull-up, multiplexed as INT1, OC2B, PCINT19, ADC/PTC function X3/Y11 per the I/O multiplexing table."
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{
"number": "2",
"name": "PD[4]",
"type": "bidirectional",
"description": "Port D bit 4 is a bidirectional I/O pin with internal pull-up, multiplexed as T0, XCK0, PCINT20 and PTC X4/Y12."
},
{
"number": "3",
"name": "PE[0]",
"type": "bidirectional",
"description": "Port E bit 0 is a bidirectional I/O pin with internal pull-up, multiplexed as SDA1, ICP4, ACO, PCINT24 and PTC X8/Y16."
},
{
"number": "4",
"name": "VCC",
"type": "power_in",
"description": "Digital supply voltage pin for the device, which must be operated within the 1.8 - 5.5V operating voltage range stated for the device."
},
{
"number": "5",
"name": "GND",
"type": "power_in",
"description": "Ground reference pin for the digital circuitry."
},
{
"number": "6",
"name": "PE[1]",
"type": "bidirectional",
"description": "Port E bit 1 is a bidirectional I/O pin with internal pull-up, multiplexed as SCL1, TC4, PCINT25 and PTC X9/Y17."
},
{
"number": "7",
"name": "PB[6]",
"type": "bidirectional",
"description": "Port B bit 6 is a bidirectional I/O pin that, depending on the clock selection fuse settings, serves as input to the inverting oscillator amplifier and internal clock circuit, or as TOSC1 for the asynchronous Timer/Counter2."
},
{
"number": "8",
"name": "PB[7]",
"type": "bidirectional",
"description": "Port B bit 7 is a bidirectional I/O pin that, depending on the clock selection fuse settings, serves as output from the inverting oscillator amplifier, or as TOSC2 for the asynchronous Timer/Counter2."
},
{
"number": "9",
"name": "PD[5]",
"type": "bidirectional",
"description": "Port D bit 5 is a bidirectional I/O pin with internal pull-up, multiplexed as OC0B, T1, PCINT21 and PTC X5/Y13."
},
{
"number": "10",
"name": "PD[6]",
"type": "bidirectional",
"description": "Port D bit 6 is a bidirectional I/O pin with internal pull-up, multiplexed as OC0A, AIN0 analog comparator input, PCINT22 and PTC X6/Y14."
},
{
"number": "11",
"name": "PD[7]",
"type": "bidirectional",
"description": "Port D bit 7 is a bidirectional I/O pin with internal pull-up, multiplexed as AIN1 analog comparator input, PCINT23 and PTC X7."
},
{
"number": "12",
"name": "PB[0]",
"type": "bidirectional",
"description": "Port B bit 0 is a bidirectional I/O pin with internal pull-up, multiplexed as ICP1, CLKO, PCINT0 and PTC X10/Y18."
},
{
"number": "13",
"name": "PB[1]",
"type": "bidirectional",
"description": "Port B bit 1 is a bidirectional I/O pin with internal pull-up, multiplexed as OC1A, PCINT1 and PTC X11/Y19."
},
{
"number": "14",
"name": "PB[2]",
"type": "bidirectional",
"description": "Port B bit 2 is a bidirectional I/O pin with internal pull-up, multiplexed as OC1B, SS0, PCINT2 and PTC X12/Y20."
},
{
"number": "15",
"name": "PB[3]",
"type": "bidirectional",
"description": "Port B bit 3 is a bidirectional I/O pin with internal pull-up, multiplexed as OC2A, TXD1, MOSI0, PCINT3 and PTC X13/Y21."
},
{
"number": "16",
"name": "PB[4]",
"type": "bidirectional",
"description": "Port B bit 4 is a bidirectional I/O pin with internal pull-up, multiplexed as RXD1, MISO0, PCINT4 and PTC X14/Y22."
},
{
"number": "17",
"name": "PB[5]",
"type": "bidirectional",
"description": "Port B bit 5 is a bidirectional I/O pin with internal pull-up, multiplexed as XCK1, SCK0, PCINT5 and PTC X15/Y23."
},
{
"number": "18",
"name": "AVCC",
"type": "power_in",
"description": "Supply voltage pin for the A/D Converter, PC[3:0] and PE[3:2], which should be connected to VCC even if the ADC is unused and through a low-pass filter if the ADC is used."
},
{
"number": "19",
"name": "PE[2]",
"type": "bidirectional",
"description": "Port E bit 2 is a bidirectional I/O pin with internal pull-up, multiplexed as ADC6 analog input (TQFP/VQFN only), ICP3, SS1, PCINT26 and PTC Y6."
},
{
"number": "20",
"name": "AREF",
"type": "power_in",
"description": "Analog reference pin for the A/D Converter."
},
{
"number": "21",
"name": "GND",
"type": "power_in",
"description": "Ground reference pin for the digital circuitry."
},
{
"number": "22",
"name": "PE[3]",
"type": "bidirectional",
"description": "Port E bit 3 is a bidirectional I/O pin with internal pull-up, multiplexed as ADC7 analog input (TQFP/VQFN only), T3, MOSI1, PCINT27 and PTC Y7."
},
{
"number": "23",
"name": "PC[0]",
"type": "bidirectional",
"description": "Port C bit 0 is a bidirectional I/O pin with internal pull-up, multiplexed as ADC0 analog input, MISO1, PCINT8 and PTC Y0; it is powered from AVCC."
},
{
"number": "24",
"name": "PC[1]",
"type": "bidirectional",
"description": "Port C bit 1 is a bidirectional I/O pin with internal pull-up, multiplexed as ADC1 analog input, SCK1, PCINT9 and PTC Y1; it is powered from AVCC."
},
{
"number": "25",
"name": "PC[2]",
"type": "bidirectional",
"description": "Port C bit 2 is a bidirectional I/O pin with internal pull-up, multiplexed as ADC2 analog input, PCINT10 and PTC Y2; it is powered from AVCC."
},
{
"number": "26",
"name": "PC[3]",
"type": "bidirectional",
"description": "Port C bit 3 is a bidirectional I/O pin with internal pull-up, multiplexed as ADC3 analog input, PCINT11 and PTC Y3; it is powered from AVCC."
},
{
"number": "27",
"name": "PC[4]",
"type": "bidirectional",
"description": "Port C bit 4 is a bidirectional I/O pin with internal pull-up, multiplexed as ADC4 analog input, SDA0, PCINT12 and PTC Y4; it is powered from VCC."
},
{
"number": "28",
"name": "PC[5]",
"type": "bidirectional",
"description": "Port C bit 5 is a bidirectional I/O pin with internal pull-up, multiplexed as ADC5 analog input, SCL0, PCINT13 and PTC Y5; it is powered from VCC."
},
{
"number": "29",
"name": "PC[6]/RESET",
"type": "bidirectional",
"description": "PC6 is a digital I/O pin if the RSTDISBL fuse is programmed; if the RSTDISBL fuse is unprogrammed it is a Reset input, where a low level longer than the minimum pulse length generates a Reset, and shorter pulses are not guaranteed to generate one."
},
{
"number": "30",
"name": "PD[0]",
"type": "bidirectional",
"description": "Port D bit 0 is a bidirectional I/O pin with internal pull-up, multiplexed as OC3A, RXD0, PCINT16, PTC X0 and PTC Y8."
},
{
"number": "31",
"name": "PD[1]",
"type": "bidirectional",
"description": "Port D bit 1 is a bidirectional I/O pin with internal pull-up, multiplexed as OC4A, TXD0, PCINT17, PTC X1 and PTC Y9."
},
{
"number": "32",
"name": "PD[2]",
"type": "bidirectional",
"description": "Port D bit 2 is a bidirectional I/O pin with internal pull-up, multiplexed as INT0, OC3B/OC4B, PCINT18, PTC X2 and PTC Y10."
},
{
"number": "33",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
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"guards": "pin_guards 0.1: passed",
"guard_notes": [
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"exposed pad 33 added from the footprint"
],
"pages_sent": 17,
"cost_usd": 0.1064,
"at": "2026-11-05T05:15:42"
},
"datasheet": {
"url": "https://ww1.microchip.com/downloads/en/DeviceDoc/40001907A.pdf",
"pages": 17,
"sha256": "6df6f6640dfc31f3",
"source_tier": "mfr"
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"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 33,
"described": 33,
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"refuses_to_fabricate": true
}
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"footprint_binding": "identity",
"sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
"checked": "2026-11-05",
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"package_dims": {
"package_code": "32MS1",
"source_page": 6,
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"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
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"metadata": {
"specs": {
"Manufacturer": "Microchip Tech",
"Package": "QFN-32-EP(5x5)",
"Category": "Embedded Processors & Controllers",
"Pins": "33"
},
"characteristics": {
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"kind": "recommended_operating",
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"min": 1.8,
"typ": null,
"max": 5.5,
"conditions": "Features list, all speed grades",
"source_page": 2,
"source": "datasheet"
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{
"name": "Operating temperature range (MU, Industrial)",
"symbol": "",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 85,
"conditions": "ATmega328PB-MU, Industrial operational range per ordering table",
"source_page": 6,
"source": "datasheet"
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{
"name": "Speed grade, 1.8 V to 5.5 V",
"symbol": "",
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"unit": "MHz",
"min": 0,
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"conditions": "Supply 1.8 - 5.5 V",
"source_page": 2,
"source": "datasheet"
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{
"name": "Speed grade, 2.7 V to 5.5 V",
"symbol": "",
"kind": "recommended_operating",
"unit": "MHz",
"min": 0,
"typ": null,
"max": 10,
"conditions": "Supply 2.7 - 5.5 V",
"source_page": 2,
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{
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"max": 20,
"conditions": "Supply 4.5 - 5.5 V",
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]
}
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