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ATTINY25-20SSN
Public Made by Adomby adom
Microchip Tech Pre-ordered MCUs, SOIC-8. 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
markdownATTINY25-20SSN
Microchip Tech · Pre-ordered MCUs · SOIC-8
ATTINY25-20SSN from Microchip Tech, in a SOIC-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): active-low reset input that resets the device when held low longer than the minimum pulse length (even with the clock not running), and also usable as a weak I/O pin. |
| 2 | PB3 | bidirectional | Port B bit 3 (PCINT3/XTAL1/CLKI/OC1B/ADC3): bi-directional I/O with internal pull-up, tri-stated during reset, and exchanged with PB4 in ATtiny15 Compatibility Mode on ATtiny25. |
| 3 | PB4 | bidirectional | Port B bit 4 (PCINT4/XTAL2/CLKO/OC1B/ADC2): bi-directional I/O with internal pull-up, tri-stated during reset, and exchanged with PB3 in ATtiny15 Compatibility Mode on ATtiny25. |
| 4 | GND | power_in | Ground. |
| 5 | PB0 | bidirectional | Port B bit 0 (MOSI/DI/SDA/AIN0/OC0A/OC1A/AREF/PCINT0): bi-directional I/O with selectable internal pull-up, tri-stated during reset. |
| 6 | PB1 | bidirectional | Port B bit 1 (MISO/DO/AIN1/OC0B/OC1A/PCINT1): bi-directional I/O with selectable internal pull-up, tri-stated during reset. |
| 7 | PB2 | bidirectional | Port B bit 2 (SCK/USCK/SCL/ADC1/T0/INT0/PCINT2): bi-directional I/O with selectable internal pull-up, tri-stated during reset. |
| 8 | VCC | power_in | Supply voltage (2.7 - 5.5V for ATtiny25, 0 - 20 MHz at 4.5 - 5.5V). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-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 (non-V) | 1 | |
| Clock frequency (2.7 - 5.5V) | 0 | 10 | MHz | @ 2.7 - 5.5V | 1 | ||
| Clock frequency (4.5 - 5.5V) | 0 | 20 | MHz | @ 4.5 - 5.5V | 1 | ||
| Operating temperature | -40 | 105 | °C | Industrial, ATtiny25-20SSN | 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:
ATTINY25-20SSN - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
attiny25-20ssn-etched.step/attiny25-20ssn-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);attiny25-20ssn.step/attiny25-20ssn.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (30 pp, sha256
d8b20bb1b8276716, retrieved 2026-10-23, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).