# ATTINY424-SSU

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

ATTINY424-SSU from Microchip Tech, in a SOIC-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 | Positive power supply pin, 1.8V-5.5V per the ordering table, with a decoupling capacitor placed close to the pin. |
| 2 | PA4 | bidirectional | General purpose I/O PA4 with ADC0 input AIN4, USART0 XDIR, SPI0 SS, TCA0 WO4 and CCL LUT0-OUT functions. |
| 3 | PA5 | bidirectional | General purpose I/O PA5 with external reference input VREFA, ADC0 input AIN5, AC0 OUT, TCA0 WO5, TCB0 WO and CCL LUT3-OUT (alternate location). |
| 4 | PA6 | bidirectional | General purpose I/O PA6 with ADC0 input AIN6 and AC0 negative input AINN0; Px6 pins have full asynchronous pin-change detection. |
| 5 | PA7 | bidirectional | General purpose I/O PA7 with ADC0 input AIN7, AC0 positive input AINP0, CCL LUT1-OUT and EVOUTA (alternate location). |
| 6 | PB3 | bidirectional | General purpose I/O PB3 that is also the TOSC1 crystal oscillator pin, with USART0 RxD, TCA0 WO0 (alternate location) and CCL LUT2-OUT functions. |
| 7 | PB2 | bidirectional | General purpose I/O PB2 that is also the TOSC2 crystal oscillator pin, with EVOUTB, USART0 TxD, TCA0 WO2 and CCL LUT2-IN2 functions; Px2 pins have full asynchronous pin-change detection. |
| 8 | PB1 | bidirectional | General purpose I/O PB1 with ADC0 input AIN10, AC0 positive input AINP2, USART XCK, TWI0 SDA, TCA0 WO1 and CCL LUT2-IN1 functions. |
| 9 | PB0 | bidirectional | General purpose I/O PB0 with ADC0 input AIN11, AC0 negative input AINN2, USART XDIR, TWI0 SCL, TCA0 WO0 and CCL LUT2-IN0 functions. |
| 10 | PA0 (UPDI/RESET) | bidirectional | General purpose I/O PA0 that is also the RESET and UPDI programming/debug pin (configured by RSTPINCFG fuse), with CCL LUT0-IN0. |
| 11 | PA1 | bidirectional | General purpose I/O PA1 with ADC0 input AIN1, USART TXD, SPI0 MOSI and CCL LUT0-IN1 functions. |
| 12 | PA2 | bidirectional | General purpose I/O PA2 with EVOUTA, ADC0 input AIN2, USART RXD, SPI0 MISO and CCL LUT0-IN2 functions; Px2 pins have full asynchronous pin-change detection. |
| 13 | PA3 | bidirectional | General purpose I/O PA3 that is also the external clock input EXTCLK, with ADC0 input AIN3, USART XCK, SPI0 SCK, TCA0 WO3 and TCB1 WO functions. |
| 14 | GND | power_in | Ground reference pin for the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-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 | ATTINY424-SSU, 14-pin SOIC, ordering table | 508 |
| Operating Temperature Range |  | -40 |  | 85 | °C | ATTINY424-SSU, 14-pin SOIC, ordering table | 508 |

## CAD (KiCad official)

- Symbol: `ATTINY424-SSU`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `attiny424-ssu-etched.step` / `attiny424-ssu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny424-ssu.step` / `attiny424-ssu.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny424-ssu-datasheet.pdf) (532 pp, sha256 `654989c2c48c3753`, retrieved 2026-10-27, 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-ssu-datasheet.pdf)