# ATTINY816-SNR

**Microchip Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · SOIC-20-300mil

ATTINY816-SNR from Microchip Tech, in a SOIC-20-300mil. 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 | Supply voltage pin for the device; the datasheet states operating supply voltage of 1.8 V to 5.5 V. |
| 2 | PA4 | bidirectional | General-purpose I/O pin PA4 with ADC0 AIN4, PTC X0/Y0, USART0 XDIR (alternate position), SPI0 SS, TCA0 WO4, TCD0 WOA and CCL LUT0-OUT functions. |
| 3 | PA5 | bidirectional | General-purpose I/O pin PA5 with ADC0 AIN5, PTC X1/Y1, DAC0 OUT, TCA0 WO5 and TCB0 WO functions. |
| 4 | PA6 | bidirectional | General-purpose I/O pin PA6 with ADC0 AIN6, PTC X2/Y2, AC0 AINN0 and DAC0 OUT functions. |
| 5 | PA7 | bidirectional | General-purpose I/O pin PA7 with ADC0 AIN7, PTC X3/Y3, AC0 AINP0 and CCL LUT1-OUT functions. |
| 6 | PB5 | bidirectional | General-purpose I/O pin PB5 with CLKOUT, ADC0 AIN8, AC0 AINP1 and TCA0 WO2 (alternate position) functions. |
| 7 | PB4 | bidirectional | General-purpose I/O pin PB4 with ADC0 AIN9, AC0 AINN1, TCA0 WO1 (alternate position) and CCL LUT0-OUT (alternate position) functions. |
| 8 | PB3 | bidirectional | General-purpose I/O pin PB3 that also serves as TOSC1 (32.768 kHz crystal oscillator input), USART0 RxD (alternate position) and TCA0 WO0 (alternate position). |
| 9 | PB2 | bidirectional | General-purpose I/O pin PB2 that also serves as TOSC2 (32.768 kHz crystal oscillator output), EVOUT1, USART0 TxD and TCA0 WO2 functions. |
| 10 | PB1 | bidirectional | General-purpose I/O pin PB1 with ADC0 AIN10, PTC X4/Y4, USART0 XCK, TWI0 SDA and TCA0 WO1 functions. |
| 11 | PB0 | bidirectional | General-purpose I/O pin PB0 with ADC0 AIN11, PTC X5/Y5, USART0 XDIR, TWI0 SCL and TCA0 WO0 functions. |
| 12 | PC0 | bidirectional | General-purpose I/O pin PC0 with SPI0 SCK (alternate position), TCB0 WO (alternate position) and TCD0 WOC functions. |
| 13 | PC1 | bidirectional | General-purpose I/O pin PC1 with SPI0 MISO (alternate position), TCD0 WOD and CCL LUT1-OUT (alternate position) functions. |
| 14 | PC2 | bidirectional | General-purpose I/O pin PC2 with EVOUT2 and SPI0 MOSI (alternate position) functions. |
| 15 | PC3 | bidirectional | General-purpose I/O pin PC3 with SPI0 SS (alternate position), TCA0 WO3 (alternate position) and CCL LUT1-IN0 functions. |
| 16 | PA0/RESET/UPDI | bidirectional | Pin PA0 that is also the RESET pin, which the datasheet describes as the UPDI programming/debug interface pin when configured as UPDI, with ADC0 AIN0 and CCL LUT0-IN0 functions. |
| 17 | PA1 | bidirectional | General-purpose I/O pin PA1 with ADC0 AIN1, USART0 TxD (alternate position), SPI0 MOSI, TWI0 SDA (alternate position) and CCL LUT0-IN1 functions. |
| 18 | PA2 | bidirectional | General-purpose I/O pin PA2 with EVOUT0, ADC0 AIN2, USART0 RxD (alternate position), SPI0 MISO, TWI0 SCL (alternate position) and CCL LUT0-IN2 functions. |
| 19 | PA3/EXTCLK | bidirectional | General-purpose I/O pin PA3 that also serves as the external clock input EXTCLK, with ADC0 AIN3, USART0 XCK (alternate position), SPI0 SCK and TCA0 WO3 functions. |
| 20 | GND | power_in | Ground reference pin for the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-20-300mil |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 20 |

## 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 |  | 1.8 |  | 5.5 | V | Ordering code ATtiny816-SNR (8 KB/512B, 20 MHz, SOIC) | 595 |
| Temperature Range |  | -40 |  | 105 | °C | Ordering code ATtiny816-SNR (SOIC) | 595 |
| Max CPU Speed |  |  |  | 20 | MHz | Ordering code ATtiny816-SNR; supply 1.8V to 5.5V | 595 |

## 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. | 492 |

## CAD (KiCad official)

- Symbol: `ATTINY816-SNR`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files: `attiny816-snr-etched.step` / `attiny816-snr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny816-snr.step` / `attiny816-snr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny816-snr-datasheet.pdf) (623 pp, sha256 `a3d47c9b11de5e45`, retrieved 2026-11-12, 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/attiny816-snr-datasheet.pdf)