# ATTINY1624-SSU

**MICROCHIP TECHNOLOGY** · Global Sourcing Parts · SOIC-14

ATTINY1624-SSU from MICROCHIP TECHNOLOGY, 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 | Power supply pin; supply voltage range is 1.8V-5.5V per the ordering table, with a decoupling capacitor placed close to the pin. |
| 2 | PA4 | bidirectional | PORTA pin 4 general-purpose I/O with ADC0 input AIN4, USART0 XDIR, SPI0 SS, TCA0 WO4 and LUT0-OUT functions. |
| 3 | PA5 | bidirectional | PORTA pin 5 general-purpose I/O with external reference input VREFA, ADC0 input AIN5, AC0 OUT, TCA0 WO5, TCB0 WO and alternate LUT3-OUT functions. |
| 4 | PA6 | bidirectional | PORTA pin 6 general-purpose I/O with ADC0 input AIN6 and AC0 negative input AINN0; has full asynchronous pin-change detection. |
| 5 | PA7 | bidirectional | PORTA pin 7 general-purpose I/O with ADC0 input AIN7, AC0 positive input AINP0, LUT1-OUT and alternate EVOUTA functions. |
| 6 | PB3 | bidirectional | PORTB pin 3 general-purpose I/O that serves as 32 kHz crystal input TOSC1, with USART0 RxD, alternate WO0 and LUT2-OUT functions. |
| 7 | PB2 | bidirectional | PORTB pin 2 general-purpose I/O that serves as crystal pin TOSC2 and EVOUTB, with USART0 TxD, TCA0 WO2 and LUT2-IN2 functions; has full asynchronous pin-change detection. |
| 8 | PB1 | bidirectional | PORTB pin 1 general-purpose I/O with ADC0 input AIN10, AC0 positive input AINP2, USART0 XCK, TWI0 SDA, TCA0 WO1 and LUT2-IN1 functions. |
| 9 | PB0 | bidirectional | PORTB pin 0 general-purpose I/O with ADC0 input AIN11, AC0 negative input AINN2, USART0 XDIR, TWI0 SCL, TCA0 WO0 and LUT2-IN0 functions. |
| 10 | PA0 (UPDI/RESET) | bidirectional | PORTA pin 0 configured by fuse as RESET, UPDI programming/debug or GPIO, with LUT0-IN0 function; UPDI pin has a constant pull-up and supports a high-voltage enable. |
| 11 | PA1 | bidirectional | PORTA pin 1 general-purpose I/O with ADC0 input AIN1, USART TXD, SPI0 MOSI and LUT0-IN1 functions. |
| 12 | PA2 | bidirectional | PORTA pin 2 general-purpose I/O with EVOUTA, ADC0 input AIN2, USART RXD, SPI0 MISO and LUT0-IN2 functions; has full asynchronous pin-change detection. |
| 13 | PA3 | bidirectional | PORTA pin 3 general-purpose I/O that can serve as external clock input EXTCLK, with ADC0 input AIN3, USART XCK, SPI0 SCK, TCA0 WO3 and TCB1 WO functions. |
| 14 | GND | power_in | Ground pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MICROCHIP TECHNOLOGY |
| Package | SOIC-14 |
| Category | Global Sourcing Parts |
| 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 | VDD | 1.8 |  | 5.5 | V |  | 498 |
| Operating temperature range |  | -40 |  | 85 | °C | ATTINY1624-SSU, U grade | 498 |
| Maximum CPU frequency |  |  |  | 20 | MHz | Maximum frequency (MHz) | 2 |
| Flash write/erase endurance |  | 10000 |  |  | cycles | Flash | 3 |
| EEPROM write/erase endurance |  | 100000 |  |  | cycles | EEPROM | 3 |
| Data retention |  |  | 40 |  | years | at 55°C | 3 |

## CAD (KiCad official)

- Symbol: `ATTINY1624-SSU`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `attiny1624-ssu-etched.step` / `attiny1624-ssu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny1624-ssu.step` / `attiny1624-ssu.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MICROCHIP TECHNOLOGY datasheet](docs/attiny1624-ssu-datasheet.pdf) (522 pp, sha256 `f86fa7551a74ed6d`, retrieved 2026-10-27, 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/attiny1624-ssu-datasheet.pdf)