STC8G1K08A-36I-SOP8 from STC Micro, in a SOP-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	P5.4/nRST/MCLKO/INT2/T0/T1CLKO/RxD_3/MOSI/SCL_2/ADC4/CCP2/CCP2_2	bidirectional	Standard GPIO P5.4. Alternate functions: nRST (active-low external reset input), MCLKO (master clock divided output), INT2 (external interrupt 2), T0 (timer-0 external clock input), T1CLKO (timer-1 divided clock output), UART1 RxD_3, SPI MOSI, I2C SCL_2, ADC4 analog input, and PCA CCP2/CCP2_2 capture/compare/PWM. When configured as the reset pin an internal 4k pull-up is permanently enabled; when configured as a normal IO the internal 4k pull-up is asserted for ~6.5 ms after power-up before being released.
2	VCC/AVCC	power_in	Main digital supply (VCC) and ADC analog supply (AVCC) combined on this pin. Place a 10 µF bulk and 0.1 µF decoupling capacitor between VCC and GND close to the device.
3	P5.5/INT3/T1/T0CLKO/TxD_3/SS/SDA_2/ADC5/ECI/ECI_2/CCP2_3	bidirectional	Standard GPIO P5.5. Alternate functions: INT3 (external interrupt 3), T1 (timer-1 external clock input), T0CLKO (timer-0 divided clock output), UART1 TxD_3, SPI SS (slave select input, output when master), I2C SDA_2, ADC5 analog input, PCA ECI/ECI_2 external pulse input, and PCA CCP2_3 capture/compare/PWM. Powers up in high-impedance input mode.
4	GND/AGND	power_in	Combined digital ground (GND) and ADC analog ground (AGND) return.
5	P3.0/RxD/INT4/ADC0	bidirectional	Standard GPIO P3.0. Alternate functions: UART1 RxD receive input, INT4 external interrupt 4, and ADC0 analog input. Powers up in weak pull-up / quasi-bidirectional mode. Do not hold P3.0, P3.1 and P3.2 low simultaneously at power-up unless entering the USB-ISP download mode.
6	P3.1/TxD/ADC1/ECI_3/CCP0_2	bidirectional	Standard GPIO P3.1. Alternate functions: UART1 TxD transmit output, ADC1 analog input, PCA ECI_3 external pulse input, and PCA CCP0_2 capture/compare/PWM. Powers up in weak pull-up / quasi-bidirectional mode.
7	P3.2/INT0/SCLK/SCL/RxD_2/ADC2/CCP0/CCP0_3	bidirectional	Standard GPIO P3.2. Alternate functions: INT0 external interrupt 0, SPI SCLK clock, I2C SCL clock, UART1 RxD_2, ADC2 analog input, and PCA CCP0/CCP0_3 capture/compare/PWM. Powers up in high-impedance input mode. Momentarily switches to quasi-bidirectional at power-up when P3.0 and P3.1 are both low, so the boot ROM can sample it for the USB-ISP entry decision.
8	P3.3/INT1/MISO/SDA/TxD_2/ADC3/CCP1/CCP1_2/CCP1_3	bidirectional	Standard GPIO P3.3. Alternate functions: INT1 external interrupt 1, SPI MISO, I2C SDA data line, UART1 TxD_2, ADC3 analog input, and PCA CCP1/CCP1_2/CCP1_3 capture/compare/PWM. Powers up in high-impedance input mode.

Key specifications

Parameter	Value
Manufacturer	STC Micro
Package	SOP-8
Category	MCU
Pins	8

Ordering variants

Same part, different packaging or reel option.

STC8G1K08A-36I-SOP8
STC8G1K08A-36I-DFN8
STC8G1K08A-36I-DIP8

CAD (KiCad official)

Symbol: STC8G1K08A-36I-SOP8
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`stc8g1k08a-36i-sop8.step`	122 KB	You want the bare part, or you mark your own boards.
`stc8g1k08a-36i-sop8-etched.step`	3.9 MB	You want the part with `STC8G1K08A-36I-SOP8` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 930 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: STC Micro datasheet (1240 pp, sha256 7d5e82c9f651aa92, 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