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ATTINY861A-SU

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Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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ATTINY861A-SU

Microchip Tech · Microcontroller Units (MCUs/MPUs/SOCs) · SOIC-20-300mil

ATTINY861A-SU from Microchip Tech, in a SOIC-20-300mil. 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 PB0 (MOSI/DI/SDA/OC1A/PCINT8) bidirectional Port B bit 0 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are MOSI/DI/SDA/OC1A/PCINT8.
2 PB1 (MISO/DO/OC1A/PCINT9) bidirectional Port B bit 1 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are MISO/DO/OC1A/PCINT9.
3 PB2 (SCK/USCK/SCL/OC1B/PCINT10) bidirectional Port B bit 2 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are SCK/USCK/SCL/OC1B/PCINT10.
4 PB3 bidirectional Port B bit 3 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are OC1B/PCINT11.
5 VCC power_in Supply voltage pin.
6 GND power_in Ground pin.
7 PB4 bidirectional Port B bit 4 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are ADC7/OC1D/CLKI/XTAL1/PCINT12.
8 PB5 bidirectional Port B bit 5 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are ADC8/OC1D/CLKO/XTAL2/PCINT13.
9 PB6 bidirectional Port B bit 6 is a bidirectional I/O pin with an individually selectable internal pull-up; its alternate functions are ADC9/INT0/T0/PCINT14.
10 PB7 (ADC10/RESET/PCINT15) bidirectional Port B bit 7 doubles as the RESET input: a low level longer than the minimum pulse length (Table 19-4) generates a reset, and when reset is disabled the pin can be used as a (weak) I/O pin.
11 PA7 (ADC6/AIN1/PCINT7) bidirectional Port A bit 7 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC6/AIN1/PCINT7.
12 PA6 (ADC5/AIN0/PCINT6) bidirectional Port A bit 6 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC5/AIN0/PCINT6.
13 PA5 (ADC4/AIN2/PCINT5) bidirectional Port A bit 5 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC4/AIN2/PCINT5.
14 PA4 (ADC3/ICP0/PCINT4) bidirectional Port A bit 4 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC3/ICP0/PCINT4.
15 AVCC power_in Analog supply for the ADC, analog comparator, BOD, internal voltage reference and Port A; it should be connected to VCC even if the ADC is unused, through a low-pass filter if the ADC is used.
16 AGND power_in Analog ground pin.
17 PA3 (AREF/PCINT3) bidirectional Port A bit 3 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are AREF/PCINT3.
18 PA2 (ADC2/INT1/USCK/SCL/PCINT2) bidirectional Port A bit 2 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC2/INT1/USCK/SCL/PCINT2.
19 PA1 (ADC1/DO/PCINT1) bidirectional Port A bit 1 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC1/DO/PCINT1.
20 PA0 (ADC0/DI/SDA/PCINT0) bidirectional Port A bit 0 is a bidirectional I/O pin with symmetrical drive and an individually selectable internal pull-up; its alternate functions are ADC0/DI/SDA/PCINT0.

Key specifications

Parameter Value
Manufacturer Microchip Tech
Package SOIC-20-300mil
Category Single Chip Microcomputer/Microcontroller
Pins 20

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 1.8 5.5 V 1
Speed grade: 0-4 MHz 0 4 MHz VCC = 1.8, 5.5V 1
Speed grade: 0-10 MHz 0 10 MHz VCC = 2.7, 5.5V 1
Speed grade: 0-20 MHz 0 20 MHz VCC = 4.5, 5.5V 1
Operating temperature (Industrial operational range) -40 85 °C ATtiny861A-SU (20S2 SOIC), Industrial operational range 13

CAD (KiCad official)

  • Symbol: ATTINY861A-SU
  • Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
  • 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
  • 3D model files: attiny861a-su-etched.step / attiny861a-su-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); attiny861a-su.step / attiny861a-su.glb are the bare package body.

Provenance

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

  • Datasheet: Microchip Tech datasheet (22 pp, sha256 80d15581b2650413, retrieved 2026-10-28, tier: lcsc)
  • 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