Overview Files Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Contents

Pinout
Key specifications
Ordering variants
CAD (KiCad official)
Provenance

README

markdown

CH376T

WCH Jiangsu Qin Heng · USB Converters · SSOP-20-208mil

CH376T from WCH Jiangsu Qin Heng, in a SSOP-20-208mil. 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	INT#	output	Interrupt request output, active low, built-in pull-up resistor. Asserted to notify the MCU of USB/SD/file-system events (device connect, transfer complete, etc.).
2	RSTI	input	External reset input, active low, built-in pull-down resistor. Drive low to force a hardware reset of the chip.
3	SPI#	input	Interface-mode configuration input latched during chip internal reset, built-in pull-up resistor. Selects between SPI device interface (low at reset) and UART serial interface (high at reset) for MCU communication.
4	TXD	bidirectional	Dual-function pin: at chip internal reset it acts as an interface-configuration strap input (built-in pull-up); after reset it is the asynchronous serial (UART) transmit data output.
5	RXD	input	Asynchronous serial (UART) receive data input, built-in pull-up resistor. Baud rate is programmable up to 3 Mbps via the SET_BAUDRATE command.
6	SD_DI	input	Serial data input of the SD card SPI host interface (data from SD card to CH376), built-in pull-up resistor.
7	V3	power_in	Internal 3.3 V regulator node. Tie to VCC when operating at 3.3 V supply; connect an external 0.01 uF decoupling capacitor when operating at 5 V supply.
8	UD+	bidirectional	USB bus D+ data line. Connects directly to the USB connector D+ pin (host or device mode).
9	UD-	bidirectional	USB bus D- data line. Connects directly to the USB connector D- pin (host or device mode).
10	GND	power_in	Common ground reference; must be tied to the ground wire of the USB bus.
11	XI	input	Crystal oscillator input terminal. Connect a 12 MHz crystal (with the usual load capacitors) between XI and XO.
12	XO	output	Inverted crystal oscillator output terminal. Connect a 12 MHz crystal between XI and XO.
13	SCS	input	SPI device interface chip-select input from the MCU, active low, built-in pull-up resistor.
14	SCK	input	SPI device interface serial clock input from the MCU, built-in pull-up resistor. Supports SPI rates up to 24 MHz.
15	SDI	input	SPI device interface serial data input (MOSI) from the MCU, built-in pull-up resistor.
16	SDO	tri_state	SPI device interface serial data output (MISO) to the MCU. Three-state output; high-impedance when SCS is deasserted.
17	SD_CS	output	SD card SPI host interface chip-select output, active low, open-drain with built-in pull-up resistor.
18	SD_DO/RST	output	Dual-function pin. In SD card mode it is the SPI serial data output (SD_DO, data from CH376 to SD card). Before entering SD card mode it acts as a power-on/external reset output (RST), active high.
19	SD_CK	output	SD card SPI host interface serial clock output (up to 6 MHz).
20	VCC	power_in	Positive power supply input. Supports 5 V, 3.3 V, or 3 V operation; requires an external 0.1 uF decoupling capacitor to GND.

Key specifications

Parameter	Value
Manufacturer	WCH Jiangsu Qin Heng
Package	SSOP-20-208mil
Category	Interface
Pins	20

Ordering variants

CH376T
CH376TCH376S

CAD (KiCad official)

Symbol: CH376T
Footprint: Package_SO:SSOP-20_5.3x7.2mm_P0.65mm
3D model: SSOP-20-208mil (KiCad packages3D, STEP)

Provenance

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

Datasheet: WCH Jiangsu Qin Heng datasheet (None pp, sha256 a5b56270d8a36d93, 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

Symbol & Footprint

Schematic Symbol

Open full view ↗

PCB Footprint