# ATTINY1604-SSN

**Microchip Tech** · Microcontrollers (MCU/MPU/SOC) · SOIC-14

ATTINY1604-SSN 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; the operating supply voltage is 1.8 V to 5.5 V. |
| 2 | PA4 | bidirectional | General-purpose I/O pin PA4 that can also serve as ADC0 input AIN4, SPI0 SS, USART0 XDIR (alternate position), TCA0 WO4 and CCL LUT0-OUT. |
| 3 | PA5 | bidirectional | General-purpose I/O pin PA5 that can also serve as ADC0 input AIN5, AC0 OUT, TCA0 WO5 and TCB0 WO. |
| 4 | PA6 | bidirectional | General-purpose I/O pin PA6 that can also serve as ADC0 input AIN6 and AC0 negative input AINN0. |
| 5 | PA7 | bidirectional | General-purpose I/O pin PA7 that can also serve as ADC0 input AIN7, AC0 positive input AINP0 and CCL LUT1-OUT. |
| 6 | PB3 | bidirectional | General-purpose I/O pin PB3 that can also serve as USART0 RXD and TCA0 WO0 (alternate position). |
| 7 | PB2 | bidirectional | General-purpose I/O pin PB2 that can also serve as event output EVOUT1, USART0 TXD and TCA0 WO2. |
| 8 | PB1 | bidirectional | General-purpose I/O pin PB1 that can also serve as ADC0 input AIN10, USART0 XCK, TWI0 SDA and TCA0 WO1. |
| 9 | PB0 | bidirectional | General-purpose I/O pin PB0 that can also serve as ADC0 input AIN11, USART0 XDIR, TWI0 SCL and TCA0 WO0. |
| 10 | PA0 (RESET/UPDI) | bidirectional | Pin PA0 is the RESET/UPDI pin, configured as GPIO, UPDI or RESET by the RSTPINCFG fuse, and also serves as ADC0 input AIN0 and CCL LUT0-IN0. |
| 11 | PA1 | bidirectional | General-purpose I/O pin PA1 that can also serve as ADC0 input AIN1, USART0 TXD (alternate position), SPI0 MOSI and CCL LUT0-IN1. |
| 12 | PA2 | bidirectional | General-purpose I/O pin PA2 that can also serve as event output EVOUT0, ADC0 input AIN2, USART0 RXD (alternate position) and SPI0 MISO. |
| 13 | PA3 (EXTCLK) | bidirectional | General-purpose I/O pin PA3 that can also serve as external clock input EXTCLK, ADC0 input AIN3, USART0 XCK (alternate position), SPI0 SCK and TCA0 WO3. |
| 14 | GND | power_in | Ground pin, the 0 V reference for the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-14 |
| Category | Embedded Processors & Controllers |
| 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 (ATtiny1604-SSN, 20 MHz variant) |  | 1.8 |  | 5.5 | V | Ordering table row for ATtiny1604-SSN: 20 MHz, SOIC, -40°C to +105°C | 493 |
| Max. CPU speed |  |  |  | 20 | MHz | ATtiny1604-SSN: 1.8V to 5.5V, SOIC, -40°C to +105°C | 493 |
| Temperature range |  | -40 |  | 105 | °C | ATtiny1604-SSN: SOIC package, 20 MHz, 1.8V to 5.5V | 493 |

## CAD (KiCad official)

- Symbol: `ATTINY1604-SSN`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `attiny1604-ssn-etched.step` / `attiny1604-ssn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny1604-ssn.step` / `attiny1604-ssn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588886718950330368) (522 pp, sha256 `f5c03e904027d54c`, retrieved 2026-10-18, tier: lcsc)
- **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/attiny1604-ssn-datasheet.pdf)