ATTINY13A-SSUR from Microchip, in a SOIC-8. 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	PB5/PCINT5/RESET/ADC0/dW	bidirectional	Port B bit 5. Multiplexed with active-low RESET input, ADC channel 0, pin-change interrupt PCINT5, and debugWIRE (dW) on-chip debug I/O. Weak I/O only when RESET function is disabled by fuse; drive low > minimum pulse length to reset the MCU.
2	PB3/PCINT3/CLKI/ADC3	bidirectional	Port B bit 3. Alternate functions: external clock input (CLKI) when external clock source is selected by fuse, ADC channel 3, and pin-change interrupt PCINT3.
3	PB4/PCINT4/ADC2	bidirectional	Port B bit 4. Alternate functions: ADC channel 2 input and pin-change interrupt PCINT4.
4	GND	power_in	Ground reference (0 V) for supply and I/O.
5	PB0/MOSI/AIN0/OC0A/PCINT0	bidirectional	Port B bit 0. Alternate functions: SPI master-out/slave-in (MOSI) for ISP programming, analog comparator positive input AIN0, Timer/Counter0 compare match output OC0A (PWM), and pin-change interrupt PCINT0.
6	PB1/MISO/AIN1/OC0B/INT0/PCINT1	bidirectional	Port B bit 1. Alternate functions: SPI master-in/slave-out (MISO) for ISP programming, analog comparator negative input AIN1, Timer/Counter0 compare match output OC0B (PWM), external interrupt INT0, and pin-change interrupt PCINT1.
7	PB2/SCK/ADC1/T0/PCINT2	bidirectional	Port B bit 2. Alternate functions: SPI serial clock SCK for ISP programming, ADC channel 1, Timer/Counter0 external clock/counter source T0, and pin-change interrupt PCINT2.
8	VCC	power_in	Positive supply voltage, 1.8 V to 5.5 V. Speed grades: 0-4 MHz @ 1.8-5.5 V, 0-10 MHz @ 2.7-5.5 V, 0-20 MHz @ 4.5-5.5 V. Decouple with a local ceramic capacitor to GND.

Key specifications

Parameter	Value
Manufacturer	Microchip
Package	SOIC-8
Category	MCU
Pins	8

Ordering variants

ATTINY13A-SSUR
ATTINY13A-SSURSSH
ATTINY13A-SSURSSHR
ATTINY13A-SSURPU
ATTINY13A-SSURMMU
ATTINY13A-SSURMMUR
ATTINY13A-SSURMU
ATTINY13A-SSURMUR

CAD (KiCad official)

Symbol: ATTINY13A-SSUR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`attiny13a-ssur.step`	122 KB	You want the bare part, or you mark your own boards.
`attiny13a-ssur-etched.step`	2.4 MB	You want the part with `ATTINY13A-SSUR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 604 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Microchip datasheet (176 pp, sha256 f4501d963ad536b5, 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