component
ATMEGA328PB-MN
Public Made by Adomby adom
Microchip Tech Microcontrollers (MCU/MPU/SOC), QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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ATMEGA328PB-MN
Microchip Tech · Microcontrollers (MCU/MPU/SOC) · QFN-32-EP(5x5)
ATMEGA328PB-MN from Microchip Tech, in a QFN-32-EP(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 bidirectional I/O with internal pull-up, also usable as INT1 external interrupt 1, OC2B Timer/Counter2 compare B output, or PCINT19. |
| 2 | PD4 | bidirectional | Port D bit 4 is a bidirectional I/O with internal pull-up, also usable as XCK0 USART0 external clock, T0 Timer/Counter0 external counter input, or PCINT20. |
| 3 | PE0 | bidirectional | Port E bit 0 is a bidirectional I/O with internal pull-up, also usable as ACO analog comparator output, ICP4 input capture, SDA1 two-wire data, or PCINT24. |
| 4 | VCC | power_in | Digital supply voltage pin. |
| 5 | GND | power_in | Ground. |
| 6 | PE1 | bidirectional | Port E bit 1 is a bidirectional I/O with internal pull-up, also usable as T4 Timer/Counter4 external counter input, SCL1 two-wire clock, or PCINT25. |
| 7 | PB6 | bidirectional | Port B bit 6 is a bidirectional I/O with internal pull-up that serves as XTAL1/TOSC1 (inverting oscillator amplifier input or external clock input, depending on clock fuse settings) and PCINT6. |
| 8 | PB7 | bidirectional | Port B bit 7 is a bidirectional I/O with internal pull-up that serves as XTAL2/TOSC2 (inverting oscillator amplifier output, depending on clock fuse settings) and PCINT7. |
| 9 | PD5 | bidirectional | Port D bit 5 is a bidirectional I/O with internal pull-up, also usable as T1 Timer/Counter1 external counter input, OC0B Timer/Counter0 compare B output, or PCINT21. |
| 10 | PD6 | bidirectional | Port D bit 6 is a bidirectional I/O with internal pull-up, also usable as AIN0 analog comparator positive input (pull-up should be switched off when used as AIN0), OC0A Timer/Counter0 compare A output, or PCINT22. |
| 11 | PD7 | bidirectional | Port D bit 7 is a bidirectional I/O with internal pull-up, also usable as AIN1 analog comparator negative input (pull-up should be switched off when used as AIN1) or PCINT23. |
| 12 | PB0 | bidirectional | Port B bit 0 is a bidirectional I/O with internal pull-up, also usable as ICP1 Timer/Counter1 input capture input, CLKO divided system clock output, or PCINT0. |
| 13 | PB1 | bidirectional | Port B bit 1 is a bidirectional I/O with internal pull-up, also usable as OC1A Timer/Counter1 compare A output or PCINT1. |
| 14 | PB2 | bidirectional | Port B bit 2 is a bidirectional I/O with internal pull-up, also usable as SS0 SPI0 slave select, OC1B Timer/Counter1 compare B output, or PCINT2. |
| 15 | PB3 | bidirectional | Port B bit 3 is a bidirectional I/O with internal pull-up, also usable as MOSI0 SPI0 master output/slave input, TXD1 USART1 transmit, OC2A Timer/Counter2 compare A output, or PCINT3. |
| 16 | PB4 | bidirectional | Port B bit 4 is a bidirectional I/O with internal pull-up, also usable as MISO0 SPI0 master input/slave output, RXD1 USART1 receive, or PCINT4. |
| 17 | PB5 | bidirectional | Port B bit 5 is a bidirectional I/O with internal pull-up, also usable as SCK0 SPI0 clock, XCK1 USART1 external clock, or PCINT5. |
| 18 | AVCC | power_in | Supply voltage pin for the A/D converter, PC[3:0], and PE[3:2]; it should be connected externally to VCC even if the ADC is not used, and through a low-pass filter if the ADC is used. |
| 19 | PE2 | bidirectional | Port E bit 2 is a bidirectional I/O with internal pull-up, also usable as ADC6 analog input channel 6, ICP3 input capture input, SS1 SPI1 slave select, or PCINT26. |
| 20 | AREF | input | Analog reference pin for the A/D converter. |
| 21 | GND | power_in | Ground. |
| 22 | PE3 | bidirectional | Port E bit 3 is a bidirectional I/O with internal pull-up, also usable as ADC7 analog input channel 7, T3 Timer/Counter3 external counter input, MOSI1 SPI1 master output/slave input, or PCINT27. |
| 23 | PC0 | bidirectional | Port C bit 0 is a bidirectional I/O with internal pull-up, also usable as ADC0 analog input channel 0 (analog power), MISO1 SPI1 data, or PCINT8. |
| 24 | PC1 | bidirectional | Port C bit 1 is a bidirectional I/O with internal pull-up, also usable as ADC1 analog input channel 1 (analog power), SCK1 SPI1 clock, or PCINT9. |
| 25 | PC2 | bidirectional | Port C bit 2 is a bidirectional I/O with internal pull-up, also usable as ADC2 analog input channel 2 (analog power) or PCINT10. |
| 26 | PC3 | bidirectional | Port C bit 3 is a bidirectional I/O with internal pull-up, also usable as ADC3 analog input channel 3 (analog power) or PCINT11. |
| 27 | PC4 | bidirectional | Port C bit 4 is a bidirectional I/O with internal pull-up, also usable as ADC4 analog input channel 4 (digital power), SDA0 two-wire data, or PCINT12. |
| 28 | PC5 | bidirectional | Port C bit 5 is a bidirectional I/O with internal pull-up, also usable as ADC5 analog input channel 5 (digital power), SCL0 two-wire clock, or PCINT13. |
| 29 | PC6/RESET | input | Reset input when the RSTDISBL fuse is unprogrammed (a low level longer than the minimum pulse length generates a reset); when the RSTDISBL fuse is programmed it is a normal I/O pin with electrical characteristics that differ from other Port C pins. |
| 30 | PD0 | bidirectional | Port D bit 0 is a bidirectional I/O with internal pull-up, also usable as RXD0 USART0 receive, OC3A Timer/Counter3 compare A output, or PCINT16. |
| 31 | PD1 | bidirectional | Port D bit 1 is a bidirectional I/O with internal pull-up, also usable as TXD0 USART0 transmit, OC4A Timer/Counter4 compare A output, or PCINT17. |
| 32 | PD2 | bidirectional | Port D bit 2 is a bidirectional I/O with internal pull-up, also usable as INT0 external interrupt 0, OC3B and OC4B Timer/Counter3/4 compare B outputs, or PCINT18. |
| 33 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | QFN-32-EP(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 voltage | 1.8 | 5.5 | V | 2 | |||
| Speed grade, maximum clock frequency | 0 | 4 | MHz | @ 1.8 - 5.5V | 2 | ||
| Speed grade, maximum clock frequency | 0 | 10 | MHz | @ 2.7 - 5.5V | 2 | ||
| Speed grade, maximum clock frequency | 0 | 20 | MHz | @ 4.5 - 5.5V | 2 | ||
| Temperature range (industrial, MN suffix) | -40 | 105 | °C | 2 | |||
| Calibrated internal RC oscillator frequency range | 7.6 | 8.4 | MHz | CKSEL[3:0]=0010 (factory default); voltage and temperature dependent | 52 |
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 | configurations, including indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. | 360 |
CAD (KiCad official)
- Symbol:
ATMEGA328PB-MN - Footprint:
Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm - 3D model: QFN-32-EP(5x5) (KiCad packages3D, STEP)
- 3D model files:
atmega328pb-mn-etched.step/atmega328pb-mn-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);atmega328pb-mn.step/atmega328pb-mn.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (463 pp, sha256
e1bb7a041b79233b, retrieved 2026-10-20, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).
# ATMEGA328PB-MN
**Microchip Tech** · Microcontrollers (MCU/MPU/SOC) · QFN-32-EP(5x5)
ATMEGA328PB-MN from Microchip Tech, in a QFN-32-EP(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 bidirectional I/O with internal pull-up, also usable as INT1 external interrupt 1, OC2B Timer/Counter2 compare B output, or PCINT19. |
| 2 | PD4 | bidirectional | Port D bit 4 is a bidirectional I/O with internal pull-up, also usable as XCK0 USART0 external clock, T0 Timer/Counter0 external counter input, or PCINT20. |
| 3 | PE0 | bidirectional | Port E bit 0 is a bidirectional I/O with internal pull-up, also usable as ACO analog comparator output, ICP4 input capture, SDA1 two-wire data, or PCINT24. |
| 4 | VCC | power_in | Digital supply voltage pin. |
| 5 | GND | power_in | Ground. |
| 6 | PE1 | bidirectional | Port E bit 1 is a bidirectional I/O with internal pull-up, also usable as T4 Timer/Counter4 external counter input, SCL1 two-wire clock, or PCINT25. |
| 7 | PB6 | bidirectional | Port B bit 6 is a bidirectional I/O with internal pull-up that serves as XTAL1/TOSC1 (inverting oscillator amplifier input or external clock input, depending on clock fuse settings) and PCINT6. |
| 8 | PB7 | bidirectional | Port B bit 7 is a bidirectional I/O with internal pull-up that serves as XTAL2/TOSC2 (inverting oscillator amplifier output, depending on clock fuse settings) and PCINT7. |
| 9 | PD5 | bidirectional | Port D bit 5 is a bidirectional I/O with internal pull-up, also usable as T1 Timer/Counter1 external counter input, OC0B Timer/Counter0 compare B output, or PCINT21. |
| 10 | PD6 | bidirectional | Port D bit 6 is a bidirectional I/O with internal pull-up, also usable as AIN0 analog comparator positive input (pull-up should be switched off when used as AIN0), OC0A Timer/Counter0 compare A output, or PCINT22. |
| 11 | PD7 | bidirectional | Port D bit 7 is a bidirectional I/O with internal pull-up, also usable as AIN1 analog comparator negative input (pull-up should be switched off when used as AIN1) or PCINT23. |
| 12 | PB0 | bidirectional | Port B bit 0 is a bidirectional I/O with internal pull-up, also usable as ICP1 Timer/Counter1 input capture input, CLKO divided system clock output, or PCINT0. |
| 13 | PB1 | bidirectional | Port B bit 1 is a bidirectional I/O with internal pull-up, also usable as OC1A Timer/Counter1 compare A output or PCINT1. |
| 14 | PB2 | bidirectional | Port B bit 2 is a bidirectional I/O with internal pull-up, also usable as SS0 SPI0 slave select, OC1B Timer/Counter1 compare B output, or PCINT2. |
| 15 | PB3 | bidirectional | Port B bit 3 is a bidirectional I/O with internal pull-up, also usable as MOSI0 SPI0 master output/slave input, TXD1 USART1 transmit, OC2A Timer/Counter2 compare A output, or PCINT3. |
| 16 | PB4 | bidirectional | Port B bit 4 is a bidirectional I/O with internal pull-up, also usable as MISO0 SPI0 master input/slave output, RXD1 USART1 receive, or PCINT4. |
| 17 | PB5 | bidirectional | Port B bit 5 is a bidirectional I/O with internal pull-up, also usable as SCK0 SPI0 clock, XCK1 USART1 external clock, or PCINT5. |
| 18 | AVCC | power_in | Supply voltage pin for the A/D converter, PC[3:0], and PE[3:2]; it should be connected externally to VCC even if the ADC is not used, and through a low-pass filter if the ADC is used. |
| 19 | PE2 | bidirectional | Port E bit 2 is a bidirectional I/O with internal pull-up, also usable as ADC6 analog input channel 6, ICP3 input capture input, SS1 SPI1 slave select, or PCINT26. |
| 20 | AREF | input | Analog reference pin for the A/D converter. |
| 21 | GND | power_in | Ground. |
| 22 | PE3 | bidirectional | Port E bit 3 is a bidirectional I/O with internal pull-up, also usable as ADC7 analog input channel 7, T3 Timer/Counter3 external counter input, MOSI1 SPI1 master output/slave input, or PCINT27. |
| 23 | PC0 | bidirectional | Port C bit 0 is a bidirectional I/O with internal pull-up, also usable as ADC0 analog input channel 0 (analog power), MISO1 SPI1 data, or PCINT8. |
| 24 | PC1 | bidirectional | Port C bit 1 is a bidirectional I/O with internal pull-up, also usable as ADC1 analog input channel 1 (analog power), SCK1 SPI1 clock, or PCINT9. |
| 25 | PC2 | bidirectional | Port C bit 2 is a bidirectional I/O with internal pull-up, also usable as ADC2 analog input channel 2 (analog power) or PCINT10. |
| 26 | PC3 | bidirectional | Port C bit 3 is a bidirectional I/O with internal pull-up, also usable as ADC3 analog input channel 3 (analog power) or PCINT11. |
| 27 | PC4 | bidirectional | Port C bit 4 is a bidirectional I/O with internal pull-up, also usable as ADC4 analog input channel 4 (digital power), SDA0 two-wire data, or PCINT12. |
| 28 | PC5 | bidirectional | Port C bit 5 is a bidirectional I/O with internal pull-up, also usable as ADC5 analog input channel 5 (digital power), SCL0 two-wire clock, or PCINT13. |
| 29 | PC6/RESET | input | Reset input when the RSTDISBL fuse is unprogrammed (a low level longer than the minimum pulse length generates a reset); when the RSTDISBL fuse is programmed it is a normal I/O pin with electrical characteristics that differ from other Port C pins. |
| 30 | PD0 | bidirectional | Port D bit 0 is a bidirectional I/O with internal pull-up, also usable as RXD0 USART0 receive, OC3A Timer/Counter3 compare A output, or PCINT16. |
| 31 | PD1 | bidirectional | Port D bit 1 is a bidirectional I/O with internal pull-up, also usable as TXD0 USART0 transmit, OC4A Timer/Counter4 compare A output, or PCINT17. |
| 32 | PD2 | bidirectional | Port D bit 2 is a bidirectional I/O with internal pull-up, also usable as INT0 external interrupt 0, OC3B and OC4B Timer/Counter3/4 compare B outputs, or PCINT18. |
| 33 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | QFN-32-EP(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 voltage | | 1.8 | | 5.5 | V | | 2 |
| Speed grade, maximum clock frequency | | 0 | | 4 | MHz | @ 1.8 - 5.5V | 2 |
| Speed grade, maximum clock frequency | | 0 | | 10 | MHz | @ 2.7 - 5.5V | 2 |
| Speed grade, maximum clock frequency | | 0 | | 20 | MHz | @ 4.5 - 5.5V | 2 |
| Temperature range (industrial, MN suffix) | | -40 | | 105 | °C | | 2 |
| Calibrated internal RC oscillator frequency range | | 7.6 | | 8.4 | MHz | CKSEL[3:0]=0010 (factory default); voltage and temperature dependent | 52 |
## 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 | configurations, including indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. | 360 |
## CAD (KiCad official)
- Symbol: `ATMEGA328PB-MN`
- Footprint: `Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm`
- 3D model: QFN-32-EP(5x5) (KiCad packages3D, STEP)
- 3D model files: `atmega328pb-mn-etched.step` / `atmega328pb-mn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `atmega328pb-mn.step` / `atmega328pb-mn.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Microchip Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588906265972527104) (463 pp, sha256 `e1bb7a041b79233b`, retrieved 2026-10-20, tier: lcsc)
- **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](docs/atmega328pb-mn-datasheet.pdf)