# STC8H2K08U-45I-SOP16

**STC Micro** · Microcontrollers (MCU/MPU/SOC) · SOP-16

STC8H2K08U-45I-SOP16 from STC Micro, in a SOP-16. 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 | P1.0/RxD2 | bidirectional | Standard I/O port P1.0 that doubles as the UART2 receive pin (RxD2); I/O pins power up in high-impedance input state and must have their mode set before use. |
| 2 | P1.1/TxD2 | bidirectional | Standard I/O port P1.1 that doubles as the UART2 transmit pin (TxD2); I/O pins power up in high-impedance input state and must have their mode set before use. |
| 3 | P1.3 | bidirectional | Standard I/O port P1.3 with no other function labelled on this package pinout. |
| 4 | UCap | passive | UCap pin of the USB part, shown in the reference circuit with a 0.1uF capacitor to ground. |
| 5 | P5.4/nRST | bidirectional | P5.4 I/O that can be configured as the active-low reset input (nRST); it is an I/O by default and the reset function takes effect after an ISP setting and a power cycle. |
| 6 | Vcc | power_in | Positive supply pin, to be decoupled to Gnd with a 10uF or larger capacitor plus 0.1uF placed close to the pin. |
| 7 | VRef+ | power_in | ADC external reference voltage input; must be tied to an external reference of 2.4V to MCU-VCC, since leaving it floating causes leakage current. |
| 8 | Gnd | power_in | Ground pin. |
| 9 | D-/P3.0 | bidirectional | USB D- line shared with P3.0 (RxD), also used for ISP download and debug; powers up as a quasi-bidirectional pin with weak pull-up. |
| 10 | D+/P3.1 | bidirectional | USB D+ line shared with P3.1 (TxD), also used for ISP download and debug; powers up as a quasi-bidirectional pin with weak pull-up. |
| 11 | P3.2 | bidirectional | Standard I/O port P3.2 (INT0, SCLK_4, SCL_4); held to Gnd at power-up it selects USB ISP download mode. |
| 12 | P3.3 | bidirectional | Standard I/O port P3.3 with no other function labelled on this package pinout. |
| 13 | P3.4 | bidirectional | Standard I/O port P3.4 with no other function labelled on this package pinout. |
| 14 | P3.5 | bidirectional | Standard I/O port P3.5; the USB-to-dual-UART application drives it low to power the target system. |
| 15 | RxD/P3.6 | bidirectional | Standard I/O port P3.6 that doubles as the receive pin (RxD). |
| 16 | TxD/P3.7 | bidirectional | Standard I/O port P3.7 that doubles as the transmit pin (TxD). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STC Micro |
| Package | SOP-16 |
| Category | Embedded Processors & Controllers |
| Pins | 16 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| 输入低电平 (VIL1, 打开施密特触发) | VIL1 |  |  | 0.99 | V | VSS=0V, VDD=3.3V, 测试温度=25℃; 打开施密特触发 | 1852 |
| 输入低电平 (VIL1, 关闭施密特触发) | VIL1 |  |  | 1.07 | V | VSS=0V, VDD=3.3V, 测试温度=25℃; 关闭施密特触发 | 1852 |
| 输入高电平（普通 I/O） (VIH1, 打开施密特触发) | VIH1 | 1.18 |  |  | V | VSS=0V, VDD=3.3V, 测试温度=25℃; 打开施密特触发 | 1852 |
| 输入高电平（普通 I/O） (VIH1, 关闭施密特触发) | VIH1 | 1.09 |  |  | V | VSS=0V, VDD=3.3V, 测试温度=25℃; 关闭施密特触发 | 1852 |
| 逻辑 0 输入电流 | IIL |  |  | 50 | uA | VSS=0V, VDD=3.3V, 测试温度=25℃; 端口电压 0V | 1852 |
| 逻辑 1 到 0 的转移电流 | ITL | 100 | 270 | 600 | uA | VSS=0V, VDD=3.3V, 测试温度=25℃; 端口电压 2.0V | 1852 |
| I/O 口上拉电阻 | RPU | 5.8 | 5.9 | 6 | KΩ | VSS=0V, VDD=3.3V, 测试温度=25℃ | 1852 |
| 工作电压 |  | 1.9 |  | 5.5 | V |  | 1851 |
| VDD 对地电压 |  | -0.3 |  | 5.5 | V |  | 1851 |
| I/O 口对地电压 |  | -0.3 |  |  | V |  | 1851 |
| 工作温度 |  | -40 |  | 125 | ℃ |  | 1851 |
| 存储温度 |  | -55 |  | 150 | ℃ |  | 1851 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| housing | PC |  | Accumulator contents and the contents of a sixteen-bit base register, which may be either the Data Pointer or the PC. In the latter case, the PC is incremented to the address of the following | 1043 |

## CAD (KiCad official)

- Symbol: `STC8H2K08U-45I-SOP16`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOP-16 (KiCad packages3D, STEP)
- 3D model files: `stc8h2k08u-45i-sop16-etched.step` / `stc8h2k08u-45i-sop16-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stc8h2k08u-45i-sop16.step` / `stc8h2k08u-45i-sop16.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STC Micro datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8756362683467599872) (2180 pp, sha256 `046aea020e4685f3`, retrieved 2026-10-18, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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](docs/stc8h2k08u-45i-sop16-datasheet.pdf)