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ATTINY85-20SF
Public Made by Adomby adom
Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), SOIC-8-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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ATTINY85-20SF
Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · SOIC-8-208mil
ATTINY85-20SF from Microchip Tech, in a SOIC-8-208mil. 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/RESET | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors, and this pin is tri-stated when a reset condition becomes active; a low level on the RESET function for longer than the minimum pulse length generates a reset, and the reset pin can also be used as a (weak) I/O pin. |
| 2 | PB3 | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 3 | PB4 | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 4 | GND | power_in | Ground. |
| 5 | PB0 (MOSI/DI/SDA/AIN0/OC0A/OC1A/AREF/PCINT0) | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 6 | PB1 (MISO/DO/AIN1/OC0B/OC1A/PCINT1) | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 7 | PB2 (SCK/USCK/SCL/ADC1/T0/INT0/PCINT2) | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 8 | VCC | power_in | Supply voltage. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-8-208mil |
| Category | Single Chip Microcomputer/Microcontroller |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Low-voltage, except XTAL1 and RESET pin | VIL | -0.5 | V | VCC = 2.4V - 5.5V | 161 | ||
| Input Low-voltage, XTAL1 pin, External Clock Selected | VIL1 | -0.5 | V | VCC = 1.8V - 5.5V | 161 | ||
| Input Low-voltage, RESET pin | VIL2 | -0.5 | V | VCC = 1.8V - 5.5V | 161 | ||
| Input Low-voltage, RESET pin as I/O | VIL3 | -0.5 | V | VCC = 2.4V - 5.5V | 161 | ||
| Output Low-voltage, Port B (except RESET) | VOL | 0.6 | V | IOL = 10 mA, VCC = 5V | 161 | ||
| Output Low-voltage, Port B (except RESET) | VOL | 0.5 | V | IOL = 5 mA, VCC = 3V | 161 | ||
| Output High-voltage, Port B (except RESET) | VOH | 4.3 | V | IOH = -10 mA, VCC = 5V | 161 | ||
| Output High-voltage, Port B (except RESET) | VOH | 2.5 | V | IOH = -5 mA, VCC = 3V | 161 | ||
| Input Leakage Current I/O Pin (pin low) | IIL | 1 | µA | VCC = 5.5V, pin low | 161 | ||
| Input Leakage Current I/O Pin (pin high) | IIH | 1 | µA | VCC = 5.5V, pin high | 161 | ||
| Reset Pull-up Resistor | RRST | 30 | 60 | kΩ | VCC = 5.5V, input low | 161 | |
| I/O Pin Pull-up Resistor | Rpu | 20 | 50 | kΩ | VCC = 5.5V, input low | 162 | |
| Power Supply Current, Active mode | ICC | 1.5 | 2.5 | mA | Active 4 MHz, VCC = 3V | 162 | |
| Power Supply Current, Active mode | ICC | 5 | 8 | mA | Active 8 MHz, VCC = 5V | 162 | |
| Power Supply Current, Idle mode | ICC | 0.35 | 0.6 | mA | Idle 4 MHz, VCC = 3V | 162 | |
| Power Supply Current, Idle mode | ICC | 1.2 | 2 | mA | Idle 8 MHz, VCC = 5V | 162 | |
| Power Supply Current, Power-down mode | ICC | 10 | µA | WDT enabled, VCC = 3V, BOD disabled | 162 | ||
| Power Supply Current, Power-down mode | ICC | 2 | µA | WDT disabled, VCC = 3V, BOD disabled | 162 | ||
| Calibrated Internal RC Oscillator accuracy, factory calibration | -10 | 10 | % | Target 8.0 MHz, VCC = 3V, 25C | 164 | ||
| Calibrated Internal RC Oscillator accuracy, user calibration | -1 | 1 | % | Fixed frequency 6-8 MHz, fixed VCC 2.7V-5.5V, fixed temperature -40C to +85C | 164 | ||
| Clock Frequency (external clock) | 1/tCLCL | 0 | 10 | MHz | VCC = 2.7 - 5.5V | 164 | |
| Clock Period (external clock) | tCLCL | 100 | ns | VCC = 2.7 - 5.5V | 164 | ||
| High Time (external clock) | tCHCX | 40 | ns | VCC = 2.7 - 5.5V | 164 | ||
| Low Time (external clock) | tCLCX | 40 | ns | VCC = 2.7 - 5.5V | 164 | ||
| Rise Time (external clock) | tCLCH | 1.6 | µs | VCC = 2.7 - 5.5V | 164 | ||
| Fall Time (external clock) | tCHCL | 1.6 | µs | VCC = 2.7 - 5.5V | 164 | ||
| Change in period from one clock cycle to the next | tCLCL | 2 | % | VCC = 2.7 - 5.5V | 164 | ||
| Minimum pulse width on RESET pin | tRST | 2.5 | µs | VCC = 3V | 165 | ||
| Min pulse width on Brown-out Reset | tBOD | 2 | µs | 165 | |||
| Bandgap reference voltage | VBG | 1 | 1.1 | 1.2 | V | VCC = 5.5V, TA = 25C | 165 |
| Release threshold of power-on reset (enhanced POR) | VPOR | 1.1 | 1.4 | 1.6 | V | Enhanced POR (ATtiny85 rev. C and newer), VCC rising | 166 |
| Activation threshold of power-on reset (enhanced POR) | VPOA | 0.6 | 1.3 | 1.6 | V | Enhanced POR (ATtiny85 rev. C and newer) | 166 |
| Power-on slope rate (enhanced POR) | SRON | 0.01 | V/ms | Enhanced POR (ATtiny85 rev. C and newer) | 166 | ||
| Brown-out detection trigger level, BODLEVEL fuse | 1.7 | 1.8 | 2 | V | BODLEVEL[2:0] = 110, TA = -40C to +85C | 166 | |
| Brown-out detection trigger level, BODLEVEL fuse | 2.5 | 2.7 | 2.9 | V | BODLEVEL[2:0] = 101, TA = -40C to +85C | 166 | |
| Brown-out detection trigger level, BODLEVEL fuse | 4.1 | 4.3 | 4.5 | V | BODLEVEL[2:0] = 100, TA = -40C to +85C | 166 | |
| Absolute accuracy, single ended channels | 2 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 | |||
| Absolute accuracy, single ended channels | 3 | LSB | VREF = 4V, VCC = 4V, ADC clock = 1 MHz | 167 | |||
| Absolute accuracy, single ended channels | 1.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz, Noise Reduction Mode | 167 | |||
| Absolute accuracy, single ended channels | 2.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 1 MHz, Noise Reduction Mode | 167 | |||
| Integral Non-linearity (INL) | 1 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 | |||
| Differential Non-linearity (DNL) | 0.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 | |||
| Gain Error | 2.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 | |||
| Offset Error | 1.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 | |||
| ADC Conversion Time | 14 | 280 | µs | Free Running Conversion | 167 | ||
| ADC Clock Frequency | 50 | 1000 | kHz | 167 | |||
| External Reference Voltage (AREF) | AREF | 2 | V | 167 | |||
| Internal Voltage Reference | VINT | 1 | 1.1 | 1.2 | V | 167 | |
| Internal 2.56V Reference | 2.3 | 2.56 | 2.8 | V | VCC > 3.0V | 167 | |
| Operating Temperature (absolute maximum) | -55 | 125 | °C | 161 | |||
| Storage Temperature | -65 | 150 | °C | 161 | |||
| Voltage on any pin except RESET, with respect to Ground | -0.5 | V | With respect to Ground | 161 | |||
| Voltage on RESET, with respect to Ground | -0.5 | 13 | V | With respect to Ground | 161 | ||
| Maximum Operating Voltage | 6 | V | 161 | ||||
| DC Current per I/O Pin | 40 | mA | 161 | ||||
| DC Current VCC and GND Pins | 200 | mA | 161 | ||||
| Supply voltage | VCC | 2.7 | 5.5 | V | ATtiny25/45/85 (not V variant) | 1 | |
| Operating temperature (industrial) | TA | -40 | 85 | °C | Industrial temperature range | 161 | |
| Maximum clock frequency (speed grade) | 20 | MHz | VCC = 4.5V - 5.5V | 1 | |||
| Maximum clock frequency (speed grade) | 10 | MHz | VCC = 2.7V - 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 | 204 |
CAD (KiCad official)
- Symbol:
ATTINY85-20SF - Footprint:
Package_SO:SOIC-8_5.3x5.3mm_P1.27mm - 3D model: SOIC-8-208mil (KiCad packages3D, STEP)
- 3D model files:
attiny85-20sf-etched.step/attiny85-20sf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);attiny85-20sf.step/attiny85-20sf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Tech datasheet (234 pp, sha256
9bbedb4082597e91, retrieved 2026-11-06, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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).
# ATTINY85-20SF
**Microchip Tech** · Microcontroller Units (MCUs/MPUs/SOCs) · SOIC-8-208mil
ATTINY85-20SF from Microchip Tech, in a SOIC-8-208mil. 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/RESET | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors, and this pin is tri-stated when a reset condition becomes active; a low level on the RESET function for longer than the minimum pulse length generates a reset, and the reset pin can also be used as a (weak) I/O pin. |
| 2 | PB3 | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 3 | PB4 | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 4 | GND | power_in | Ground. |
| 5 | PB0 (MOSI/DI/SDA/AIN0/OC0A/OC1A/AREF/PCINT0) | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 6 | PB1 (MISO/DO/AIN1/OC0B/OC1A/PCINT1) | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 7 | PB2 (SCK/USCK/SCL/ADC1/T0/INT0/PCINT2) | bidirectional | Port B is a 6-bit bi-directional I/O port with internal pull-up resistors (selected for each bit), and its output buffers have symmetrical drive characteristics with both high sink and source capability. |
| 8 | VCC | power_in | Supply voltage. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Microchip Tech |
| Package | SOIC-8-208mil |
| Category | Single Chip Microcomputer/Microcontroller |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Low-voltage, except XTAL1 and RESET pin | VIL | -0.5 | | | V | VCC = 2.4V - 5.5V | 161 |
| Input Low-voltage, XTAL1 pin, External Clock Selected | VIL1 | -0.5 | | | V | VCC = 1.8V - 5.5V | 161 |
| Input Low-voltage, RESET pin | VIL2 | -0.5 | | | V | VCC = 1.8V - 5.5V | 161 |
| Input Low-voltage, RESET pin as I/O | VIL3 | -0.5 | | | V | VCC = 2.4V - 5.5V | 161 |
| Output Low-voltage, Port B (except RESET) | VOL | | | 0.6 | V | IOL = 10 mA, VCC = 5V | 161 |
| Output Low-voltage, Port B (except RESET) | VOL | | | 0.5 | V | IOL = 5 mA, VCC = 3V | 161 |
| Output High-voltage, Port B (except RESET) | VOH | 4.3 | | | V | IOH = -10 mA, VCC = 5V | 161 |
| Output High-voltage, Port B (except RESET) | VOH | 2.5 | | | V | IOH = -5 mA, VCC = 3V | 161 |
| Input Leakage Current I/O Pin (pin low) | IIL | | | 1 | µA | VCC = 5.5V, pin low | 161 |
| Input Leakage Current I/O Pin (pin high) | IIH | | | 1 | µA | VCC = 5.5V, pin high | 161 |
| Reset Pull-up Resistor | RRST | 30 | | 60 | kΩ | VCC = 5.5V, input low | 161 |
| I/O Pin Pull-up Resistor | Rpu | 20 | | 50 | kΩ | VCC = 5.5V, input low | 162 |
| Power Supply Current, Active mode | ICC | | 1.5 | 2.5 | mA | Active 4 MHz, VCC = 3V | 162 |
| Power Supply Current, Active mode | ICC | | 5 | 8 | mA | Active 8 MHz, VCC = 5V | 162 |
| Power Supply Current, Idle mode | ICC | | 0.35 | 0.6 | mA | Idle 4 MHz, VCC = 3V | 162 |
| Power Supply Current, Idle mode | ICC | | 1.2 | 2 | mA | Idle 8 MHz, VCC = 5V | 162 |
| Power Supply Current, Power-down mode | ICC | | | 10 | µA | WDT enabled, VCC = 3V, BOD disabled | 162 |
| Power Supply Current, Power-down mode | ICC | | | 2 | µA | WDT disabled, VCC = 3V, BOD disabled | 162 |
| Calibrated Internal RC Oscillator accuracy, factory calibration | | -10 | | 10 | % | Target 8.0 MHz, VCC = 3V, 25C | 164 |
| Calibrated Internal RC Oscillator accuracy, user calibration | | -1 | | 1 | % | Fixed frequency 6-8 MHz, fixed VCC 2.7V-5.5V, fixed temperature -40C to +85C | 164 |
| Clock Frequency (external clock) | 1/tCLCL | 0 | | 10 | MHz | VCC = 2.7 - 5.5V | 164 |
| Clock Period (external clock) | tCLCL | 100 | | | ns | VCC = 2.7 - 5.5V | 164 |
| High Time (external clock) | tCHCX | 40 | | | ns | VCC = 2.7 - 5.5V | 164 |
| Low Time (external clock) | tCLCX | 40 | | | ns | VCC = 2.7 - 5.5V | 164 |
| Rise Time (external clock) | tCLCH | | | 1.6 | µs | VCC = 2.7 - 5.5V | 164 |
| Fall Time (external clock) | tCHCL | | | 1.6 | µs | VCC = 2.7 - 5.5V | 164 |
| Change in period from one clock cycle to the next | tCLCL | | | 2 | % | VCC = 2.7 - 5.5V | 164 |
| Minimum pulse width on RESET pin | tRST | 2.5 | | | µs | VCC = 3V | 165 |
| Min pulse width on Brown-out Reset | tBOD | 2 | | | µs | | 165 |
| Bandgap reference voltage | VBG | 1 | 1.1 | 1.2 | V | VCC = 5.5V, TA = 25C | 165 |
| Release threshold of power-on reset (enhanced POR) | VPOR | 1.1 | 1.4 | 1.6 | V | Enhanced POR (ATtiny85 rev. C and newer), VCC rising | 166 |
| Activation threshold of power-on reset (enhanced POR) | VPOA | 0.6 | 1.3 | 1.6 | V | Enhanced POR (ATtiny85 rev. C and newer) | 166 |
| Power-on slope rate (enhanced POR) | SRON | 0.01 | | | V/ms | Enhanced POR (ATtiny85 rev. C and newer) | 166 |
| Brown-out detection trigger level, BODLEVEL fuse | | 1.7 | 1.8 | 2 | V | BODLEVEL[2:0] = 110, TA = -40C to +85C | 166 |
| Brown-out detection trigger level, BODLEVEL fuse | | 2.5 | 2.7 | 2.9 | V | BODLEVEL[2:0] = 101, TA = -40C to +85C | 166 |
| Brown-out detection trigger level, BODLEVEL fuse | | 4.1 | 4.3 | 4.5 | V | BODLEVEL[2:0] = 100, TA = -40C to +85C | 166 |
| Absolute accuracy, single ended channels | | | | 2 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 |
| Absolute accuracy, single ended channels | | | | 3 | LSB | VREF = 4V, VCC = 4V, ADC clock = 1 MHz | 167 |
| Absolute accuracy, single ended channels | | | | 1.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz, Noise Reduction Mode | 167 |
| Absolute accuracy, single ended channels | | | | 2.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 1 MHz, Noise Reduction Mode | 167 |
| Integral Non-linearity (INL) | | | | 1 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 |
| Differential Non-linearity (DNL) | | | | 0.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 |
| Gain Error | | | | 2.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 |
| Offset Error | | | | 1.5 | LSB | VREF = 4V, VCC = 4V, ADC clock = 200 kHz | 167 |
| ADC Conversion Time | | 14 | | 280 | µs | Free Running Conversion | 167 |
| ADC Clock Frequency | | 50 | | 1000 | kHz | | 167 |
| External Reference Voltage (AREF) | AREF | 2 | | | V | | 167 |
| Internal Voltage Reference | VINT | 1 | 1.1 | 1.2 | V | | 167 |
| Internal 2.56V Reference | | 2.3 | 2.56 | 2.8 | V | VCC > 3.0V | 167 |
| Operating Temperature (absolute maximum) | | -55 | | 125 | °C | | 161 |
| Storage Temperature | | -65 | | 150 | °C | | 161 |
| Voltage on any pin except RESET, with respect to Ground | | -0.5 | | | V | With respect to Ground | 161 |
| Voltage on RESET, with respect to Ground | | -0.5 | | 13 | V | With respect to Ground | 161 |
| Maximum Operating Voltage | | | | 6 | V | | 161 |
| DC Current per I/O Pin | | | | 40 | mA | | 161 |
| DC Current VCC and GND Pins | | | | 200 | mA | | 161 |
| Supply voltage | VCC | 2.7 | | 5.5 | V | ATtiny25/45/85 (not V variant) | 1 |
| Operating temperature (industrial) | TA | -40 | | 85 | °C | Industrial temperature range | 161 |
| Maximum clock frequency (speed grade) | | | | 20 | MHz | VCC = 4.5V - 5.5V | 1 |
| Maximum clock frequency (speed grade) | | | | 10 | MHz | VCC = 2.7V - 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 | 204 |
## CAD (KiCad official)
- Symbol: `ATTINY85-20SF`
- Footprint: `Package_SO:SOIC-8_5.3x5.3mm_P1.27mm`
- 3D model: SOIC-8-208mil (KiCad packages3D, STEP)
- 3D model files: `attiny85-20sf-etched.step` / `attiny85-20sf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `attiny85-20sf.step` / `attiny85-20sf.glb` are the bare package body.
## Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- **Datasheet:** [Microchip Tech datasheet](docs/attiny85-20sf-datasheet.pdf) (234 pp, sha256 `9bbedb4082597e91`, retrieved 2026-11-06, 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/attiny85-20sf-datasheet.pdf)