# ATTINY424-XUR

**Microchip Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · TSSOP-14

ATTINY424-XUR from Microchip Tech, in a TSSOP-14. 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 | VDD | power_in | Power supply pin; the datasheet gives a 1.8V-5.5V supply range for this part and requires a decoupling capacitor close to the VDD/GND pair. |
| 2 | PA4 | bidirectional | PORTA pin 4 general purpose I/O with ADC input AIN4, USART XDIR, SPI SS, TCA0 WO4 and CCL LUT0-OUT functions. |
| 3 | PA5 | bidirectional | PORTA pin 5 general purpose I/O with external reference input VREFA, ADC input AIN5, AC0 OUT, TCA0 WO5, TCB0 WO and CCL LUT3-OUT (alternate location) functions. |
| 4 | PA6 | bidirectional | PORTA pin 6 general purpose I/O with ADC input AIN6 and AC0 negative input AINN0; has full asynchronous pin-change detection. |
| 5 | PA7 | bidirectional | PORTA pin 7 general purpose I/O with ADC input AIN7, AC0 positive input AINP0, CCL LUT1-OUT and EVOUTA (alternate location). |
| 6 | PB3 | bidirectional | PORTB pin 3 general purpose I/O that also serves as 32 kHz crystal input TOSC1, with USART RxD, TCA0 WO0 (alternate location) and CCL LUT2-OUT functions. |
| 7 | PB2 | bidirectional | PORTB pin 2 general purpose I/O that also serves as 32 kHz crystal output TOSC2, with EVOUTB, USART TxD, TCA0 WO2 and CCL LUT2-IN2 functions; has full asynchronous pin-change detection. |
| 8 | PB1 | bidirectional | PORTB pin 1 general purpose I/O with ADC input AIN10, AC0 positive input AINP2, USART XCK, TWI SDA, TCA0 WO1 and CCL LUT2-IN1 functions. |
| 9 | PB0 | bidirectional | PORTB pin 0 general purpose I/O with ADC input AIN11, AC0 negative input AINN2, USART XDIR, TWI SCL, TCA0 WO0 and CCL LUT2-IN0 functions. |
| 10 | PA0 | bidirectional | PORTA pin 0 general purpose I/O configurable by fuse as RESET or UPDI programming/debug pin, also CCL LUT0-IN0; has full asynchronous pin-change detection. |
| 11 | PA1 | bidirectional | PORTA pin 1 general purpose I/O with ADC input AIN1, USART TXD, SPI MOSI and CCL LUT0-IN1 functions. |
| 12 | PA2 | bidirectional | PORTA pin 2 general purpose I/O with EVOUTA, ADC input AIN2, USART RXD, SPI MISO and CCL LUT0-IN2 functions; has full asynchronous pin-change detection. |
| 13 | PA3 | bidirectional | PORTA pin 3 general purpose I/O that also serves as external clock input EXTCLK, with ADC input AIN3, USART XCK, SPI SCK, TCA0 WO3 and TCB1 WO functions. |
| 14 | GND | power_in | Ground pin; needs a decoupling capacitor close to the VDD/GND pair. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | TSSOP-14 |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 14 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VDD | 1.8 |  | 5.5 | V |  | 508 |
| Operating Temperature Range |  | -40 |  | 85 | °C | U grade | 508 |
| Maximum frequency |  |  |  | 20 | MHz | ATtiny424 peripheral overview | 2 |

## CAD (KiCad official)

- Symbol: `ATTINY424-XUR`
- Footprint: `Package_SO:TSSOP-14_4.4x5mm_P0.65mm`
- 3D model: TSSOP-14 (KiCad packages3D, STEP)
- 3D model files: `attiny424-xur-etched.step` / `attiny424-xur-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny424-xur.step` / `attiny424-xur.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny424-xur-datasheet.pdf) (532 pp, sha256 `654989c2c48c3753`, retrieved 2026-10-31, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/attiny424-xur-datasheet.pdf)