# ATTINY1606-SN

**Microchip Tech** · Pre-ordered MCUs · SOIC-20-300mil

ATTINY1606-SN 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 | Positive supply pin; the datasheet gives an operating supply voltage of 1.8 V to 5.5 V. |
| 2 | PA4 | bidirectional | General-purpose I/O PA4 with ADC input AIN4, TCA0 WO4, CCL LUT0-OUT, and alternate USART XDIR and SPI SS. |
| 3 | PA5 | bidirectional | General-purpose I/O PA5 with ADC input AIN5, analog comparator output OUT, TCA0 WO5, and TCB0 WO. |
| 4 | PA6 | bidirectional | General-purpose I/O PA6 with ADC input AIN6 and analog comparator negative input AINN0. |
| 5 | PA7 | bidirectional | General-purpose I/O PA7 with ADC input AIN7, analog comparator positive input AINP0, and CCL LUT1-OUT. |
| 6 | PB5 | bidirectional | General-purpose I/O PB5 with CLKOUT, ADC input AIN8, analog comparator positive input AINP1, and alternate TCA0 WO2. |
| 7 | PB4 | bidirectional | General-purpose I/O PB4 with ADC input AIN9, analog comparator negative input AINN1, alternate TCA0 WO1, and alternate LUT0-OUT. |
| 8 | PB3 | bidirectional | General-purpose I/O PB3 with USART0 RxD and alternate TCA0 WO0. |
| 9 | PB2 | bidirectional | General-purpose I/O PB2 with event output EVOUT1, USART0 TxD, and TCA0 WO2. |
| 10 | PB1 | bidirectional | General-purpose I/O PB1 with ADC input AIN10, USART0 XCK, TWI SDA, and TCA0 WO1. |
| 11 | PB0 | bidirectional | General-purpose I/O PB0 with ADC input AIN11, USART0 XDIR, TWI SCL, and TCA0 WO0. |
| 12 | PC0 | bidirectional | General-purpose I/O PC0 with alternate SPI SCK and alternate TCB0 WO. |
| 13 | PC1 | bidirectional | General-purpose I/O PC1 with alternate SPI MISO and alternate CCL LUT1-OUT. |
| 14 | PC2 | bidirectional | General-purpose I/O PC2 with event output EVOUT2 and alternate SPI MOSI. |
| 15 | PC3 | bidirectional | General-purpose I/O PC3 with alternate SPI SS, alternate TCA0 WO3, and CCL LUT1-IN0. |
| 16 | PA0 (RESET/UPDI) | bidirectional | PA0 is configured by the RSTPINCFG fuse as GPIO, RESET or UPDI programming/debug pin, and also provides ADC input AIN0 and CCL LUT0-IN0. |
| 17 | PA1 | bidirectional | General-purpose I/O PA1 with ADC input AIN1, CCL LUT0-IN1, and alternate USART0 TxD and SPI MOSI. |
| 18 | PA2 | bidirectional | General-purpose I/O PA2 with event output EVOUT0, ADC input AIN2, CCL LUT0-IN2, and alternate USART0 RxD and SPI MISO. |
| 19 | PA3 (EXTCLK) | bidirectional | General-purpose I/O PA3 with external clock input EXTCLK, ADC input AIN3, TCA0 WO3, and alternate USART0 XCK and SPI SCK. |
| 20 | GND | power_in | Ground pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-20-300mil |
| Category | Embedded Processors & Controllers |
| 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 | VDD | 1.8 |  | 5.5 | V | ATtiny1606-SN ordering information | 493 |
| Max. CPU speed |  |  |  | 20 | MHz | ATtiny1606-SN ordering information | 493 |
| Operating temperature range |  | -40 |  | 105 | °C | ATtiny1606-SN ordering information | 493 |

## CAD (KiCad official)

- Symbol: `ATTINY1606-SN`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files: `attiny1606-sn-etched.step` / `attiny1606-sn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny1606-sn.step` / `attiny1606-sn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny1606-sn-datasheet.pdf) (522 pp, sha256 `f5c03e904027d54c`, retrieved 2026-10-26, 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/attiny1606-sn-datasheet.pdf)