# ATTINY404-SSF

**Microchip Tech** · Pre-ordered MCUs · SOIC-14

ATTINY404-SSF 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 | Input supply voltage; the ATTINY404-SSF ordering code is specified for 2.7 V to 5.5 V at up to 16 MHz, and the device is listed as operating down to 1.8 V in the general ratings. |
| 2 | PA4 | bidirectional | Port A GPIO with analog input AIN4, USART0 XDIR, SPI0 SS, TCA0 WO4 and CCL LUT0-OUT alternate functions; pin position is selected through PORTMUX where alternate positions apply. |
| 3 | PA5 | bidirectional | Port A GPIO with analog input AIN5, analog comparator AC0 OUT, TCA0 WO5 and TCB0 WO alternate functions. |
| 4 | PA6 | bidirectional | Port A GPIO with analog input AIN6, analog comparator AINN0 input and SPI0 MOSI alternate function; PA6 has full asynchronous pin-change detection that can wake the device from all sleep modes. |
| 5 | PA7 | bidirectional | Port A GPIO with analog input AIN7, analog comparator AINP0 input, SPI0 MISO and CCL LUT1-OUT alternate functions. |
| 6 | PB3 | bidirectional | Port B GPIO with USART0 RxD (alternate position) and TCA0 WO0 (alternate position) functions; alternate pin positions are selected via PORTMUX. |
| 7 | PB2 | bidirectional | Port B GPIO with event output EVOUT1, USART0 TxD and TCA0 WO2 alternate functions; PB2 has full asynchronous pin-change detection that can wake the device from all sleep modes. |
| 8 | PB1 | bidirectional | Port B GPIO with analog input AIN10, USART0 XCK, TWI0 SDA and TCA0 WO1 alternate functions. |
| 9 | PB0 | bidirectional | Port B GPIO with analog input AIN11, USART0 XDIR, TWI0 SCL and TCA0 WO0 alternate functions. |
| 10 | PA0/RESET/UPDI | bidirectional | Multiplexed pin configured by RSTPINCFG as GPIO, UPDI or RESET; enabling UPDI with 12 V requires care because the RESET pin overshoot limit is VRSTMAX = 13 V, and it also provides AIN0 and CCL LUT0-IN0. |
| 11 | PA1 | bidirectional | Port A GPIO with analog input AIN1, USART0 TxD (alternate position), SPI0 MOSI and CCL LUT0-IN1 alternate functions. |
| 12 | PA2 | bidirectional | Port A GPIO with event output EVOUT0, analog input AIN2, USART0 RxD (alternate position), SPI0 MISO and CCL LUT0-IN2 alternate functions; PA2 has full asynchronous pin-change detection that can wake the device from all sleep modes. |
| 13 | PA3/EXTCLK | bidirectional | Port A GPIO that also serves as the external clock input EXTCLK, with analog input AIN3, USART0 XCK (alternate position), SPI0 SCK and TCA0 WO3 alternate functions. |
| 14 | GND | power_in | Ground 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 (ATtiny404-SSF ordering variant) |  | 2.7 |  | 5.5 | V |  | 521 |
| Operating temperature range (ATtiny404-SSF, F grade) |  | -40 |  | 125 | °C |  | 521 |
| Max CPU speed (ATtiny404-SSF) |  |  |  | 16 | MHz |  | 521 |
| Duration of UPDI.txd=0 | TUPDI | 10 |  | 200 | µs |  | 488 |
| Duration of Debugger.txd=0 | TDeb0 | 0.2 |  | 1 | µs |  | 488 |
| Duration of Debugger.txd=z | TDebZ | 200 |  | 14000 | µs |  | 488 |

## CAD (KiCad official)

- Symbol: `ATTINY404-SSF`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `attiny404-ssf-etched.step` / `attiny404-ssf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny404-ssf.step` / `attiny404-ssf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny404-ssf-datasheet.pdf) (543 pp, sha256 `92355081a8b7ac88`, retrieved 2026-10-28, 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/attiny404-ssf-datasheet.pdf)