# CH315G

**WCH(Jiangsu Qin Heng)** · USB ICs · SOP-14

CH315G from WCH(Jiangsu Qin Heng), in a SOP-14. 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 | REF | passive | Reference voltage of the internal analog circuit, requires an external voltage-divider resistor and decoupling capacitor. |
| 2 | GND | power_in | Common ground, connected directly to the ground wire of the USB bus. |
| 3 | VCC | power_in | Positive supply input (3.2-5.3V), requires an external 0.1-1uF decoupling capacitor. |
| 4 | XD- | bidirectional | Analog signal pin connected directly to the negative end of the differential extension cable. |
| 5 | XD+ | bidirectional | Analog signal pin connected directly to the positive end of the differential extension cable. |
| 6 | GND | power_in | Common ground, connected directly to the ground wire of the USB bus. |
| 7 | NC | unconnected | No-connect pin, must not be connected. |
| 8 | NC | unconnected | No-connect pin, must not be connected. |
| 9 | VCC | power_in | Positive supply input (3.2-5.3V), requires an external 0.1-1uF decoupling capacitor. |
| 10 | UP# | input | Mode select input with internal pull-up; low selects upstream (host-side) mode, high selects downstream (device-side) mode. |
| 11 | NC | unconnected | No-connect pin, must not be connected. |
| 12 | UD- | bidirectional | USB signal pin connected directly to the D- data line of the USB bus. |
| 13 | UD+ | bidirectional | USB signal pin connected directly to the D+ data line of the USB bus. |
| 14 | V3 | passive | Tied to VCC with external 3.3V supply at 3.3V operation; at 5V operation needs a 0.01-0.1uF decoupling capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | WCH(Jiangsu Qin Heng) |
| Package | SOP-14 |
| Category | Interface ICs |
| Pins | 14 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Ambient operating temperature | TA | -40 |  | 85 | ℃ |  | 3 |
| Storage temperature | TS | -55 |  | 125 | ℃ |  | 3 |
| Supply voltage | VCC | -0.5 |  | 6 | V | VCC to power, GND to ground | 3 |
| Voltage on input or output pins | VIO | -0.5 |  |  | V | max printed as VCC+0.5 | 3 |
| Supply voltage | VCC | 3.2 | 5 | 5.3 | V | TA=25℃, VCC=5V or VCC=V3=3.3V | 3 |
| Quiescent supply current | ICCs |  | 2 | 6 | mA | TA=25℃, VCC=5V or VCC=V3=3.3V | 3 |
| Operating supply current | ICCa |  | 20 | 50 | mA | TA=25℃, VCC=5V or VCC=V3=3.3V | 3 |
| UP# pin pull-up input current | IUPup | 3 | 150 | 300 | uA | TA=25℃, VCC=5V or VCC=V3=3.3V | 3 |
| ACT# pin pull-up input current | IUPact | 100 | 230 | 400 | uA | TA=25℃, VCC=5V or VCC=V3=3.3V | 3 |
| Full-speed USB extension distance | Lfs | 60 | 75 |  | m |  | 3 |
| Low-speed USB extension distance | Lls | 150 | 200 |  | m |  | 3 |

## CAD (KiCad official)

- Symbol: `CH315G`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOP-14 (KiCad packages3D, STEP)
- 3D model files: `ch315g-etched.step` / `ch315g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ch315g.step` / `ch315g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WCH(Jiangsu Qin Heng) datasheet](docs/ch315g-datasheet.pdf) (4 pp, sha256 `d41610cac3975a46`, retrieved 2026-10-27, 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), consensus `claude-sonnet-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/ch315g-datasheet.pdf)