ATTINY104-SSNR from Microchip Tech, in a SOIC-14. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	VCC	power_in	Digital supply voltage. Operating range 1.8-5.5 V (external programming requires 2.7-5.5 V). Decouple locally with a 100 nF ceramic capacitor to GND.
2	PA0/PCINT0/T0/CLKI/AIN0/ADC0/TPICLK	bidirectional	Port A bit 0. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: external clock input (CLKI), TC0 external clock (T0), analog comparator positive input (AIN0), ADC channel 0, pin-change interrupt PCINT0, and TPI programming clock (TPICLK).
3	PA1/PCINT1/OC0B/AIN1/ADC1/TPIDATA	bidirectional	Port A bit 1. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: TC0 compare-match B output (OC0B), analog comparator negative input (AIN1), ADC channel 1, pin-change interrupt PCINT1, and TPI programming data (TPIDATA).
4	PA2/PCINT2/RESET	bidirectional	Port A bit 2, also the external RESET input. A low level longer than the minimum pulse length generates a reset even when the clock is not running (provided the reset function has not been disabled). May alternatively be used as a weak I/O pin or as pin-change interrupt PCINT2.
5	PA3/PCINT3/OC0A	bidirectional	Port A bit 3. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: TC0 compare-match A output (OC0A, alternate location when T/C Remap is enabled) and pin-change interrupt PCINT3.
6	PA4/PCINT4/ICP0	bidirectional	Port A bit 4. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: TC0 input-capture (ICP0, alternate location with T/C Remap) and pin-change interrupt PCINT4.
7	PA5/PCINT5/OC0B/ADC2	bidirectional	Port A bit 5. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: ADC channel 2, TC0 compare-match B output (OC0B, alternate location with T/C Remap), and pin-change interrupt PCINT5.
8	PA6/PCINT6/ADC3	bidirectional	Port A bit 6. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: ADC channel 3 and pin-change interrupt PCINT6.
9	PA7/PCINT7	bidirectional	Port A bit 7. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternate: pin-change interrupt PCINT7.
10	PB0/PCINT8/ADC4	bidirectional	Port B bit 0. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: ADC channel 4 and pin-change interrupt PCINT8.
11	PB1/PCINT9/INT0/CLKO/XCK0/OC0A/ADC5	bidirectional	Port B bit 1. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: external interrupt INT0, system clock output CLKO, USART0 external clock XCK0, TC0 compare-match A output (OC0A, primary location), ADC channel 5, and pin-change interrupt PCINT9.
12	PB2/PCINT10/ICP0/TxD0/ADC6	bidirectional	Port B bit 2. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: TC0 input-capture (ICP0, primary location), USART0 transmit data (TxD0), ADC channel 6, and pin-change interrupt PCINT10.
13	PB3/PCINT11/T0/RxD0/ACO/ADC7	bidirectional	Port B bit 3. General-purpose bidirectional I/O with individually selectable internal pull-up; symmetrical high sink/source drive. Muxed alternates: TC0 external clock (T0, alternate location with T/C Remap), USART0 receive data (RxD0), analog comparator output (ACO), ADC channel 7, and pin-change interrupt PCINT11.
14	GND	power_in	Ground reference for the digital supply and all I/O. Connect directly to the system ground plane.

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	SOIC-14
Category	Embedded Processors & Controllers
Pins	14

Ordering variants

Same part, different packaging or reel option.

ATTINY104-SSNR
ATTINY104-SSNRSSFR
ATTINY104-SSNRF-SSNR
ATTINY104-SSNRF-SSFR
ATTINY104-SSNRM7R
ATTINY104-SSNRM8R
ATTINY104-SSNRF-M7R
ATTINY104-SSNRF-M8R

CAD (KiCad official)

Symbol: ATTINY104-SSNR
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOIC-14 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Microchip Tech datasheet (None pp, sha256 53bde81c2835d14d, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF