# ATTINY45-20PU

**Microchip Tech** · MICROCHIP · DIP-8

ATTINY45-20PU from Microchip Tech, in a DIP-8. 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 | PB5 | bidirectional | Port B bit 5 (PCINT5/RESET/ADC0/dW): a low level longer than the minimum pulse length on RESET generates a reset (if the reset pin is not disabled), and the pin can also be used as a weak I/O pin. |
| 2 | PB3 | bidirectional | Port B bit 3 (PCINT3/XTAL1/CLKI/OC1B/ADC3) is a bi-directional I/O pin with internal pull-up, tri-stated during reset. |
| 3 | PB4 | bidirectional | Port B bit 4 (PCINT4/XTAL2/CLKO/OC1B/ADC2) is a bi-directional I/O pin with internal pull-up, tri-stated during reset. |
| 4 | GND | power_in | Ground. |
| 5 | PB0 | bidirectional | Port B bit 0 (MOSI/DI/SDA/AIN0/OC0A/OC1A/AREF/PCINT0) is a bi-directional I/O pin with internal pull-up, tri-stated during reset. |
| 6 | PB1 | bidirectional | Port B bit 1 (MISO/DO/AIN1/OC0B/OC1A/PCINT1) is a bi-directional I/O pin with internal pull-up, tri-stated during reset. |
| 7 | PB2 | bidirectional | Port B bit 2 (SCK/USCK/SCL/ADC1/T0/INT0/PCINT2) is a bi-directional I/O pin with internal pull-up, tri-stated during reset. |
| 8 | VCC | power_in | Supply voltage, 2.7 - 5.5V for ATtiny45 (1.8 - 5.5V for the V version). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | DIP-8 |
| Category | Embedded Processors & Controllers |
| Pins | 8 |

## 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 | 2.7 |  | 5.5 | V | ATtiny25/45/85 (non-V), 20 MHz grade | 1 |
| Operating Temperature, Industrial |  | -40 |  | 85 | °C | Industrial, ATtiny45-20PU, package 8P3 | 12 |
| Speed Grade (low voltage range) |  | 0 |  | 10 | MHz | @ 2.7 - 5.5V | 1 |
| Speed Grade (high voltage range) |  | 0 |  | 20 | MHz | @ 4.5 - 5.5V | 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 | 3. Code indicators: H = NiPdAu lead finish, U/N = matte tin, R = tape & reel. 4. Can also be supplied in wafer form. Contact your local Atmel sales office for ordering information and minimum quantiti | 11 |

## CAD (KiCad official)

- Symbol: `ATTINY45-20PU`
- Footprint: `Package_DIP:DIP-8_W7.62mm`
- 3D model: DIP-8 (KiCad packages3D, STEP)
- 3D model files: `attiny45-20pu-etched.step` / `attiny45-20pu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny45-20pu.step` / `attiny45-20pu.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny45-20pu-datasheet.pdf) (30 pp, sha256 `80124a2d9a6f0385`, retrieved 2026-10-23, 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/attiny45-20pu-datasheet.pdf)