# ATTINY817-MFR

**Microchip Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · QFN-24-EP(4x4)

ATTINY817-MFR from Microchip Tech, in a QFN-24-EP(4x4). 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 | PA2 | bidirectional | PA2 is a general-purpose I/O pin on PORTA that can also serve as EVOUT0, AIN2, RxD, MISO or SCL, with alternate positions selected through PORTMUX. |
| 2 | PA3 (EXTCLK) | bidirectional | PA3 is a general-purpose I/O pin on PORTA that serves as the external clock input EXTCLK, and can also serve as AIN3, XCK or SCK. |
| 3 | GND | power_in | GND is the ground reference pin for the device. |
| 4 | VDD | power_in | VDD is the power supply pin, with an operating supply range of 1.8 V to 5.5 V. |
| 5 | PA4 | bidirectional | PA4 is a general-purpose I/O pin on PORTA that can also serve as AIN4, X0/Y0 for PTC, XDIR, SS, WO4, WOA or LUT0-OUT. |
| 6 | PA5 | bidirectional | PA5 is a general-purpose I/O pin on PORTA that can also serve as AIN5, X1/Y1, OUT, WO5 or WOB. |
| 7 | PA6 | bidirectional | PA6 is a general-purpose I/O pin on PORTA that can also serve as AIN6, X2/Y2, AINN0 or the DAC0 OUT analog output. |
| 8 | PA7 | bidirectional | PA7 is a general-purpose I/O pin on PORTA that can also serve as AIN7, X3/Y3, AINP0 or LUT1-OUT. |
| 9 | PB7 | bidirectional | PB7 is a general-purpose I/O pin on PORTB that is available on the 24-pin package. |
| 10 | PB6 | bidirectional | PB6 is a general-purpose I/O pin on PORTB that is available on the 24-pin package. |
| 11 | PB5 | bidirectional | PB5 is a general-purpose I/O pin on PORTB that can also serve as CLKOUT, AIN8, AINP1 or WO2. |
| 12 | PB4 | bidirectional | PB4 is a general-purpose I/O pin on PORTB that can also serve as AIN9, AINN1, WO1 or LUT0-OUT. |
| 13 | PB3 (TOSC1) | bidirectional | PB3 is a general-purpose I/O pin on PORTB that serves as the 32.768 kHz crystal oscillator input TOSC1, and can also serve as RxD or WO0. |
| 14 | PB2 (TOSC2) | bidirectional | PB2 is a general-purpose I/O pin on PORTB that serves as the 32.768 kHz crystal oscillator output TOSC2, and can also serve as EVOUT1, TxD or WO2. |
| 15 | PB1 | bidirectional | PB1 is a general-purpose I/O pin on PORTB that can also serve as AIN10, X4/Y4, XCK, SDA or WO1. |
| 16 | PB0 | bidirectional | PB0 is a general-purpose I/O pin on PORTB that can also serve as AIN11, X5/Y5, XDIR, SCL or WO0. |
| 17 | PC0 | bidirectional | PC0 is a general-purpose I/O pin on PORTC that can also serve as SCK, WO or WOC. |
| 18 | PC1 | bidirectional | PC1 is a general-purpose I/O pin on PORTC that can also serve as MISO, WOD or LUT1-OUT. |
| 19 | PC2 | bidirectional | PC2 is a general-purpose I/O pin on PORTC that can also serve as EVOUT2 or MOSI. |
| 20 | PC3 | bidirectional | PC3 is a general-purpose I/O pin on PORTC that can also serve as SS, WO3 or LUT1-IN0. |
| 21 | PC4 | bidirectional | PC4 is a general-purpose I/O pin on PORTC that can also serve as WO4 or LUT1-IN1. |
| 22 | PC5 | bidirectional | PC5 is a general-purpose I/O pin on PORTC that can also serve as WO5 or LUT1-IN2. |
| 23 | PA0 (RESET/UPDI) | bidirectional | PA0 is the Reset/UPDI pin, whose function is set by the RSTPINCFG fuse to GPIO, UPDI or RESET, and it can also serve as AIN0 or LUT0-IN0. |
| 24 | PA1 | bidirectional | PA1 is a general-purpose I/O pin on PORTA that can also serve as AIN1, TxD, MOSI, SDA or LUT0-IN1. |
| 25 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | QFN-24-EP(4x4) |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 25 |

## 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 |  | 2.7 |  | 5.5 | V |  | 560 |
| Operating temperature range |  | -40 |  | 125 | °C |  | 560 |
| Maximum CPU speed |  |  |  | 16 | MHz |  | 560 |

## 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 | including indium tin oxide (ITO) sensor grids. The PTC requires one pin per X-line and one pin per Y-line. In the Self Capacitance mode, the PTC requires only one pin (Y-line) for each touch sensor. | 461 |

## CAD (KiCad official)

- Symbol: `ATTINY817-MFR`
- Footprint: `Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm`
- 3D model: QFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files: `attiny817-mfr-etched.step` / `attiny817-mfr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny817-mfr.step` / `attiny817-mfr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Microchip Tech datasheet](docs/attiny817-mfr-datasheet.pdf) (596 pp, sha256 `c2392fe1c4c9666a`, retrieved 2026-10-30, 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/attiny817-mfr-datasheet.pdf)