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ATMEGA48A-MU
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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownATMEGA48A-MU
Microchip Tech · Pre-ordered MCUs · VQFN-32(5x5)
ATMEGA48A-MU 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, with alternate functions INT1, OC2B and PCINT19. |
| 2 | PD4 | bidirectional | Port D bit 4 is a bi-directional I/O pin with internal pull-up, with alternate functions XCK, T0 and PCINT20. |
| 3 | GND | power_in | Ground. |
| 4 | VCC | power_in | Digital supply voltage. |
| 5 | GND | power_in | Ground. |
| 6 | VCC | power_in | Digital supply voltage. |
| 7 | PB6 | bidirectional | Port B bit 6 is used as XTAL1/TOSC1 input to the inverting oscillator amplifier depending on clock fuse settings, otherwise it is a bi-directional I/O pin with internal pull-up. |
| 8 | PB7 | bidirectional | Port B bit 7 is used as XTAL2/TOSC2 output of the inverting oscillator amplifier depending on clock fuse settings, otherwise it is a bi-directional I/O pin with internal pull-up. |
| 9 | PD5 | bidirectional | Port D bit 5 is a bi-directional I/O pin with internal pull-up, with alternate functions T1, OC0B and PCINT21. |
| 10 | PD6 | bidirectional | Port D bit 6 is a bi-directional I/O pin with internal pull-up, with alternate functions AIN0 (analog comparator positive input), OC0A and PCINT22. |
| 11 | PD7 | bidirectional | Port D bit 7 is a bi-directional I/O pin with internal pull-up, with alternate functions AIN1 (analog comparator negative input) and PCINT23. |
| 12 | PB0 | bidirectional | Port B bit 0 is a bi-directional I/O pin with internal pull-up, with alternate functions ICP1, CLKO (divided system clock output) and PCINT0. |
| 13 | PB1 | bidirectional | Port B bit 1 is a bi-directional I/O pin with internal pull-up, with alternate functions OC1A and PCINT1. |
| 14 | PB2 | bidirectional | Port B bit 2 is a bi-directional I/O pin with internal pull-up, with alternate functions SS, OC1B and PCINT2. |
| 15 | PB3 | bidirectional | Port B bit 3 is a bi-directional I/O pin with internal pull-up, with alternate functions MOSI, OC2A and PCINT3. |
| 16 | PB4 | bidirectional | Port B bit 4 is a bi-directional I/O pin with internal pull-up, with alternate functions MISO and PCINT4. |
| 17 | PB5 | bidirectional | Port B bit 5 is a bi-directional I/O pin with internal pull-up, with alternate functions SCK (SPI clock) and PCINT5. |
| 18 | AVCC | power_in | Supply voltage pin for the A/D converter, PC3:0 and ADC7:6, which should be connected to VCC even if the ADC is not used. |
| 19 | ADC6 | input | Analog input channel 6 of the 10-bit ADC, available only in the TQFP and VQFN packages and powered from the analog supply. |
| 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, available only in the TQFP and VQFN packages and powered from the analog supply. |
| 23 | PC0 | bidirectional | Port C bit 0 is a bi-directional I/O pin with internal pull-up, also used as ADC0 analog input using analog power and as PCINT8. |
| 24 | PC1 | bidirectional | Port C bit 1 is a bi-directional I/O pin with internal pull-up, also used as ADC1 analog input using analog power and as PCINT9. |
| 25 | PC2 | bidirectional | Port C bit 2 is a bi-directional I/O pin with internal pull-up, also used as ADC2 analog input using analog power and as PCINT10. |
| 26 | PC3 | bidirectional | Port C bit 3 is a bi-directional I/O pin with internal pull-up, also used as ADC3 analog input using analog power and as PCINT11. |
| 27 | PC4 | bidirectional | Port C bit 4 is a bi-directional I/O pin with internal pull-up, also used as SDA (2-wire serial data) and ADC4 analog input using digital power, and as PCINT12. |
| 28 | PC5 | bidirectional | Port C bit 5 is a bi-directional I/O pin with internal pull-up, also used as SCL (2-wire serial clock) and ADC5 analog input using digital power, and as PCINT13. |
| 29 | PC6 | input | PC6 is the active-low RESET input when the RSTDISBL fuse is unprogrammed, where a low level longer than the minimum pulse length generates a reset, and is otherwise an I/O pin also usable as PCINT14. |
| 30 | PD0 | bidirectional | Port D bit 0 is a bi-directional I/O pin with internal pull-up, used as the USART receive data input RXD when the USART receiver is enabled, and as PCINT16. |
| 31 | PD1 | bidirectional | Port D bit 1 is a bi-directional I/O pin with internal pull-up, used as the USART transmit data output TXD when the USART transmitter is enabled, and as PCINT17. |
| 32 | PD2 | bidirectional | Port D bit 2 is a bi-directional I/O pin with internal pull-up, with alternate functions INT0 (external interrupt 0 input) and PCINT18. |
| 33 | EP | 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 |
|---|---|---|---|---|---|---|---|
| Power Supply Current | ICC | 0.2 | 0.55 | mA | Active 1MHz, VCC = 2V | 308 | |
| Power Supply Current | ICC | 1.2 | 3.5 | mA | Active 4MHz, VCC = 3V | 308 | |
| Power Supply Current | ICC | 4 | 12 | mA | Active 8MHz, VCC = 5V | 308 | |
| Power Supply Current | ICC | 0.03 | 0.5 | mA | Idle 1MHz, VCC = 2V | 308 | |
| Power Supply Current | ICC | 0.21 | 1.5 | mA | Idle 4MHz, VCC = 3V | 308 | |
| Power Supply Current | ICC | 0.9 | 5.5 | mA | Idle 8MHz, VCC = 5V | 308 | |
| Power-down Supply Current | ICC | 3.9 | 15 | µA | Power-down mode, WDT enabled, VCC = 3V | 308 | |
| Power-down Supply Current | ICC | 0.1 | 2 | µA | Power-down mode, WDT disabled, VCC = 3V | 308 | |
| Operating Temperature | -55 | 125 | °C | 308 | |||
| Storage Temperature | -65 | 150 | °C | 308 | |||
| Voltage on RESET with respect to Ground | -0.5 | 13 | V | 308 | |||
| DC Current per I/O Pin | 40 | mA | 308 | ||||
| DC Current VCC and GND Pins | 200 | mA | 308 | ||||
| Voltage on any pin except RESET with respect to Ground | -0.5 | V | Upper limit printed as VCC+0.5V | 308 | |||
| Power-save Supply Current | ICC | 0.75 | µA | Power-save mode, 32kHz TOSC enabled, VCC = 1.8V | 308 | ||
| Power-save Supply Current | ICC | 0.9 | µA | Power-save mode, 32kHz TOSC enabled, VCC = 3V | 308 |
CAD (KiCad official)
- Symbol:
ATMEGA48A-MU - Footprint:
Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm - 3D model: VQFN-32(5x5) (KiCad packages3D, STEP)
- 3D model files:
atmega48a-mu-etched.step/atmega48a-mu-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);atmega48a-mu.step/atmega48a-mu.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (653 pp, sha256
b9b9d83cda56a95d, retrieved 2026-10-30, tier: manufacturer) - 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).