# ATTINY402-SSNR

**Microchip Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · SOIC-8

ATTINY402-SSNR from Microchip Tech, in a SOIC-8. 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 | Input supply pin; the datasheet gives the operating supply range as 2.7 V to 5.5 V (with the speed grade limited to 16 MHz only at 4.5 V to 5.5 V). |
| 2 | PA6 | bidirectional | PORTA bit 6 general-purpose I/O, also analog input AIN6 and negative comparator input AINN0, with alternate-function USART TxD, SPI MOSI (alternate position), TCA WO0, and CCL LUT0-OUT; it can be used for external interrupt and as an event input. |
| 3 | PA7 | bidirectional | PORTA bit 7 general-purpose I/O, also analog input AIN7 and positive comparator input AINP0, with alternate-function USART RxD, SPI MISO (alternate position), TCA WO0 (alternate position), and CCL LUT1-OUT; it can be used for external interrupt and as an event input. |
| 4 | PA1 | bidirectional | PORTA bit 1 general-purpose I/O, also analog input AIN1, USART TxD (alternate position), SPI MOSI, TWI SDA, TCA WO1, and CCL LUT0-IN1; it can be used for external interrupt and as an event input. |
| 5 | PA2 | bidirectional | PORTA bit 2 general-purpose I/O, also event output EVOUT0, analog input AIN2, USART RxD (alternate position), SPI MISO, TWI SCL, TCA WO2, and CCL LUT0-IN2; it provides full asynchronous pin-change detection. |
| 6 | PA0/RESET/UPDI | bidirectional | PORTA bit 0 shared with the Reset/UPDI pin, which is selected by the RSTPINCFG fuse (GPIO, UPDI or RESET); it also provides analog input AIN0, SPI SS, TCA WO0 XDIR function as listed, and CCL LUT0-IN0, and the UPDI uses this pin for single-wire programming and debug. |
| 7 | PA3/EXTCLK | bidirectional | PORTA bit 3 general-purpose I/O, also external clock input EXTCLK, analog input AIN3, USART XCK, SPI SCK, TCA WO0/WO3, and clock output OUT as listed in the multiplexing table; it can be used for external interrupt and as an event input. |
| 8 | GND | power_in | Ground reference pin for the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-8 |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `ATTINY402-SSNR`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `attiny402-ssnr-etched.step` / `attiny402-ssnr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny402-ssnr.step` / `attiny402-ssnr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny402-ssnr-datasheet.pdf) (523 pp, sha256 `de549517d587eb2e`, retrieved 2026-11-05, tier: manufacturer)
- **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/attiny402-ssnr-datasheet.pdf)