# CH392T

**WCH Jiangsu Qin Heng** · Ethernet Transceivers · TSSOP-20

CH392T from WCH Jiangsu Qin Heng, in a TSSOP-20. 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 | RSTI | input | External reset input, active low; when low the chip is held in reset and after release it delays about 35 ms before normal operation. |
| 2 | SEL | input | Communication interface select with internal pull-up: high selects the asynchronous UART, low selects the SPI interface, sampled at power-on reset. |
| 3 | TXD | output | Asynchronous serial data output to the host MCU. |
| 4 | RXD | input | Asynchronous serial data input from the host MCU, with internal pull-up resistor. |
| 5 | SCS | input | SPI chip select input, active low. |
| 6 | SCK | input | SPI clock input; the chip samples data on the rising edge and outputs on the falling edge (SPI mode 0 or 3). |
| 7 | SDO | output | SPI data output to the host MCU MISO line. |
| 8 | SDI | input | SPI data input from the host MCU MOSI line. |
| 9 | RXP | passive | Ethernet differential receive positive signal, connected to the magnetics/RJ45 port. |
| 10 | RXN | passive | Ethernet differential receive negative signal, connected to the magnetics/RJ45 port. |
| 11 | TXP | passive | Ethernet differential transmit positive signal, connected to the magnetics/RJ45 port. |
| 12 | TXN | passive | Ethernet differential transmit negative signal, connected to the magnetics/RJ45 port. |
| 13 | NC | unconnected | Reserved pin; leave floating (no connection). |
| 14 | VDD | power_in | 3.3 V power supply voltage input. |
| 15 | INT | output | Interrupt request output to the host MCU, active low. |
| 16 | ACT | output | Drive pin for the Ethernet activity indicator LED. |
| 17 | LINK | output | PHY link indicator drive pin, active low. |
| 18 | GND | power_in | Chip ground. |
| 19 | XI | input | Crystal oscillator input; an 8 MHz crystal is required for versions before 0x18, while 8 MHz or 16 MHz is accepted from version 0x18 onward. |
| 20 | XO | output | Crystal oscillator output (datasheet table lists this pin as output; the description text calls it the input end of the oscillator). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | WCH Jiangsu Qin Heng |
| Package | TSSOP-20 |
| Category | Interface |
| Pins | 20 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| System supply voltage | VDD | 3 | 3.3 | 3.6 | V |  | 23 |
| GPIO low-level input voltage | VIL | -0.3 |  | 0.9 | V |  | 23 |
| GPIO high-level input voltage | VIH | 2 |  |  | V |  | 23 |
| Low-level output voltage | VOL | 0 |  | 0.4 | V |  | 23 |
| Operating ambient temperature | TA | -40 |  | 85 | ℃ | VDD=3.3V | 23 |
| Storage ambient temperature (CH392T) | TS | -40 |  | 125 | ℃ | CH392T | 23 |
| Supply voltage (VDD to GND) | VDD | -0.3 |  | 3.9 | V |  | 23 |
| Voltage on input or output pins | VIO | -0.3 |  |  | V |  | 23 |
| Chip default run current after power-on | Iidle |  | 19.4 |  | mA |  | 23 |
| Chip run current after network initialization | Iinit |  | 23.7 |  | mA |  | 23 |
| Chip current after network connection | Ilink |  | 23.5 |  | mA |  | 23 |
| Current during Ethernet transmission | Isend |  | 40 |  | mA |  | 23 |
| Current during Ethernet reception | Irec |  | 24 |  | mA |  | 23 |
| Current in light sleep mode 1 | Isleep1 |  | 4.8 |  | mA |  | 23 |
| Current in light sleep mode 2 | Isleep2 |  | 11.7 |  | mA |  | 23 |
| Current in light sleep mode 3 | Isleep3 |  | 11.7 |  | mA |  | 23 |
| Current in deep sleep mode | Istop |  | 70 |  | uA |  | 23 |

## CAD (KiCad official)

- Symbol: `CH392T`
- Footprint: `Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm`
- 3D model: TSSOP-20 (KiCad packages3D, STEP)
- 3D model files: `ch392t-etched.step` / `ch392t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ch392t.step` / `ch392t.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WCH Jiangsu Qin Heng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618867019068420096) (28 pp, sha256 `6e567c4f77a16da0`, retrieved 2026-10-20, 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-haiku-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/ch392t-datasheet.pdf)