component
ATTINY25-20MUR
Public Made by Adomby adom
Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownATTINY25-20MUR
Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · QFN-20-EP(4x4)
ATTINY25-20MUR from Microchip Tech, in a QFN-20-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 | PB5 | bidirectional | Port B bit 5 with alternate functions PCINT5/RESET/ADC0/dW; a low level longer than the minimum pulse length on RESET generates a reset, and it can also be used as a (weak) I/O pin. |
| 2 | PB3 | bidirectional | Port B bit 3 with internal pull-up and alternate functions PCINT3/XTAL1/CLKI/OC1B/ADC3. |
| 3 | DNC | unconnected | Do Not Connect. |
| 4 | DNC | unconnected | Do Not Connect. |
| 5 | PB4 | bidirectional | Port B bit 4 with internal pull-up and alternate functions PCINT4/XTAL2/CLKO/OC1B/ADC2. |
| 6 | DNC | unconnected | Do Not Connect. |
| 7 | DNC | unconnected | Do Not Connect. |
| 8 | GND | power_in | Ground. |
| 9 | DNC | unconnected | Do Not Connect. |
| 10 | DNC | unconnected | Do Not Connect. |
| 11 | PB0 | bidirectional | Port B bit 0 with internal pull-up and alternate functions MOSI/DI/SDA/AIN0/OC0A/OC1A/AREF/PCINT0. |
| 12 | PB1 | bidirectional | Port B bit 1 with internal pull-up and alternate functions MISO/DO/AIN1/OC0B/OC1A/PCINT1. |
| 13 | DNC | unconnected | Do Not Connect. |
| 14 | PB2 | bidirectional | Port B bit 2 with internal pull-up and alternate functions SCK/USCK/SCL/ADC1/T0/INT0/PCINT2. |
| 15 | VCC | power_in | Supply voltage. |
| 16 | DNC | unconnected | Do Not Connect. |
| 17 | DNC | unconnected | Do Not Connect. |
| 18 | DNC | unconnected | Do Not Connect. |
| 19 | DNC | unconnected | Do Not Connect. |
| 20 | DNC | unconnected | Do Not Connect. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | QFN-20-EP(4x4) |
| Category | Single Chip Microcomputer/Microcontroller |
| Pins | 21 |
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 supply voltage VCC (ATtiny25, non-V, 20 MHz grade) | VCC | 2.7 | 5.5 | V | ATtiny25 (not V) 2.7 - 5.5V; ordering table 20 MHz grade lists 2.7 - 5.5V | 1 | |
| Speed grade, 20 MHz range | fCLK | 0 | 20 | MHz | @ 4.5 - 5.5V | 1 | |
| Speed grade, 10 MHz range | fCLK | 0 | 10 | MHz | @ 2.7 - 5.5V | 1 | |
| Industrial operating temperature range (MUR package, -20 grade) | TA | -40 | 85 | °C | Industrial (-40C to +85C) ordering row for ATtiny25-20MU / -20MUR (20M1 QFN) | 11 |
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:
ATTINY25-20MUR - Footprint:
Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm - 3D model: QFN-20-EP(4x4) (KiCad packages3D, STEP)
- 3D model files:
attiny25-20mur-etched.step/attiny25-20mur-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);attiny25-20mur.step/attiny25-20mur.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (30 pp, sha256
fcdc535a426347b5, retrieved 2026-10-28, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).