STC8G1K08-38I-SOP16 from STC Micro, in a SOP-16. 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	P1.0/RxD2/CCP1/ADC0	bidirectional	Standard I/O port P1.0. Muxed: UART2 receive (RxD2), PCA CCP1 capture/compare/PWM, ADC channel 0 analog input. On power-up P1.0 defaults to high-impedance input.
2	P1.1/TxD2/CCP0/ADC1	bidirectional	Standard I/O port P1.1. Muxed: UART2 transmit (TxD2), PCA CCP0 capture/compare/PWM, ADC channel 1 analog input.
3	P1.6/XTALO/MCLKO_2/RxD_3/ADC6	bidirectional	Standard I/O port P1.6. Muxed: external crystal oscillator output XTALO, master clock divided output MCLKO_2, UART1 alternate receive RxD_3, ADC channel 6 analog input.
4	P1.7/XTALI/TxD_3/ADC7	bidirectional	Standard I/O port P1.7. Muxed: external crystal oscillator input XTALI, UART1 alternate transmit TxD_3, ADC channel 7 analog input.
5	P5.4/nRST/MCLKO	bidirectional	Standard I/O port P5.4. Muxed with active-low reset input nRST (RSTCFG configures reset function) and master-clock output MCLKO. When configured as nRST, an internal 4K pull-up remains enabled; when used as GPIO, the 4K pull-up stays on for ~6.5 ms at power-up before auto-disabling.
6	VCC/AVCC/ADC_VRef+	power_in	Main digital supply, analog supply, and ADC positive reference. Operating voltage range for the -38I speed grade per datasheet electricals. If external ADC reference is used, ADC_VRef+ must be tied to a valid reference (2.4 V to VCC); do not leak.
7	P5.5	bidirectional	Standard I/O port P5.5. No alternate functions listed for this pin.
8	GND/AGND	power_in	Digital and analog ground return.
9	P3.0/RxD/ADC8/INT4	bidirectional	Standard I/O port P3.0. Muxed: UART1 receive (RxD), ADC channel 8 analog input, external interrupt INT4. Powers up in weak pull-up quasi-bidirectional mode.
10	P3.1/TxD/ADC9	bidirectional	Standard I/O port P3.1. Muxed: UART1 transmit (TxD), ADC channel 9 analog input. Powers up in weak pull-up quasi-bidirectional mode.
11	P3.2/INT0/ADC10/SCL_4/SCLK_4	bidirectional	Standard I/O port P3.2. Muxed: external interrupt INT0, ADC channel 10, I2C alternate clock SCL_4, SPI alternate clock SCLK_4.
12	P3.3/INT1/ADC11/SDA_4/MISO_4	bidirectional	Standard I/O port P3.3. Muxed: external interrupt INT1, ADC channel 11, I2C alternate data SDA_4, SPI alternate MISO_4.
13	P3.4/T0/T1CLKO/ADC12/ECI_2/CMPO/MOSI_4	bidirectional	Standard I/O port P3.4. Muxed: Timer 0 external clock (T0), Timer 1 clock output (T1CLKO), ADC channel 12, PCA alternate external pulse input ECI_2, analog comparator output CMPO, SPI alternate MOSI_4.
14	P3.5/T1/T0CLKO/ADC13/CCP0_2/SS_4	bidirectional	Standard I/O port P3.5. Muxed: Timer 1 external clock (T1), Timer 0 clock output (T0CLKO), ADC channel 13, PCA alternate CCP0_2 capture/compare/PWM, SPI alternate slave-select SS_4.
15	P3.6/INT2/RxD_2/ADC14/CCP1_2/CMP-	bidirectional	Standard I/O port P3.6. Muxed: external interrupt INT2, UART1 alternate receive RxD_2, ADC channel 14, PCA alternate CCP1_2 capture/compare/PWM, analog comparator negative input CMP-.
16	P3.7/INT3/TxD_2/CCP2/CCP2_2/CMP+	bidirectional	Standard I/O port P3.7. Muxed: external interrupt INT3, UART1 alternate transmit TxD_2, PCA CCP2 and alternate CCP2_2 capture/compare/PWM, analog comparator positive input CMP+.

Key specifications

Parameter	Value
Manufacturer	STC Micro
Package	SOP-16
Category	MCU
Pins	16

Ordering variants

Same part, different packaging or reel option.

STC8G1K08-38I-SOP16
STC8G1K08-38I-TSSOP20
STC8G1K08-38I-QFN20

CAD (KiCad official)

Symbol: STC8G1K08-38I-SOP16
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOP-16 (KiCad packages3D, STEP)

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)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
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