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ATTINY25-20MUR

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Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ATTINY25-20MUR

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); attiny25-20mur.step / attiny25-20mur.glb are 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, primary claude-sonnet-5-5 (text+vision), consensus claude-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).

Datasheet PDF