# ATTINY44A-SSN

**Microchip Tech** · MICROCHIP · SOIC-14

ATTINY44A-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 | VCC | power_in | Supply voltage (1.8-5.5V operating range). |
| 2 | PB0 | bidirectional | Port B bit 0, bi-directional I/O with internal pull-up; alternate functions PCINT8/XTAL1/CLKI. |
| 3 | PB1 | bidirectional | Port B bit 1, bi-directional I/O with internal pull-up; alternate functions PCINT9/XTAL2. |
| 4 | PB3 | bidirectional | Port B bit 3 with RESET/dW alternate function (PCINT11); a low level longer than the minimum pulse length generates a reset, and it becomes an I/O pin if the RSTDISBL fuse is programmed ('0'). |
| 5 | PB2 | bidirectional | Port B bit 2, bi-directional I/O with internal pull-up; alternate functions PCINT10/INT0/OC0A/CKOUT. |
| 6 | PA7 | bidirectional | Port A bit 7, bi-directional I/O with internal pull-up; alternate functions PCINT7/ICP/OC0B/ADC7. |
| 7 | PA6 | bidirectional | Port A bit 6, bi-directional I/O with internal pull-up; alternate functions PCINT6/OC1A/SDA/MOSI/DI/ADC6. |
| 8 | PA5 | bidirectional | Port A bit 5, bi-directional I/O with internal pull-up; alternate functions ADC5/DO/MISO/OC1B/PCINT5. |
| 9 | PA4 | bidirectional | Port A bit 4, bi-directional I/O with internal pull-up; alternate functions ADC4/USCK/SCL/T1/PCINT4. |
| 10 | PA3 | bidirectional | Port A bit 3, bi-directional I/O with internal pull-up; alternate functions ADC3/T0/PCINT3. |
| 11 | PA2 | bidirectional | Port A bit 2, bi-directional I/O with internal pull-up; alternate functions ADC2/AIN1/PCINT2. |
| 12 | PA1 | bidirectional | Port A bit 1, bi-directional I/O with internal pull-up; alternate functions ADC1/AIN0/PCINT1. |
| 13 | PA0 | bidirectional | Port A bit 0, bi-directional I/O with internal pull-up; alternate functions ADC0/AREF/PCINT0. |
| 14 | GND | power_in | Ground. |

## 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 |
|---|---|---|---|---|---|---|---|
| Operating voltage | VCC | 1.8 |  | 5.5 | V |  | 1 |
| Operating temperature (SSN grade) |  | -40 |  | 105 | °C | Industrial, 14S1 ATtiny44A-SSN | 12 |
| Speed grade at 1.8, 5.5V |  | 0 |  | 4 | MHz | 1.8, 5.5V | 1 |
| Speed grade at 2.7, 5.5V |  | 0 |  | 10 | MHz | 2.7, 5.5V | 1 |
| Speed grade at 4.5, 5.5V |  | 0 |  | 20 | MHz | 4.5, 5.5V | 1 |
| Active mode supply current |  |  | 210 |  | µA | 1.8V and 1 MHz | 1 |
| Idle mode supply current |  |  | 33 |  | µA | 1.8V and 1 MHz | 1 |
| Power-down mode supply current |  |  | 0.1 |  | µA | 1.8V and 25°C | 1 |

## 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 |, H: NiPdAu lead finish, F, N, U: matte tin | 11 |

## CAD (KiCad official)

- Symbol: `ATTINY44A-SSN`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `attiny44a-ssn-etched.step` / `attiny44a-ssn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny44a-ssn.step` / `attiny44a-ssn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny44a-ssn-datasheet.pdf) (22 pp, sha256 `098b286f495acbe0`, retrieved 2026-10-31, tier: lcsc)
- **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/attiny44a-ssn-datasheet.pdf)