Mfr Part #:

CH9328

Mfr Name: WCH

The WCH CH9328 is a USB Interface IC that converts serial UART data to a standard USB HID keyboard device. It supports 12Mbps USB 2.0 and operates at 3.3V or 5V.

✓ Total Stock: 1,751 pcs

$ Price Range: $3.89

CH9328 Available from 1 distributor

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
Xingangxin ✓ Non-Authorised Inventory information	1,751 pcs On Request	1751 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request

CH9328 Specifications Quick View

Most important parameters for selection – full specs in datasheet.

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Category	New Products
Manufacturer Name	WCH
Data Rate	12Mbps
Mounting Type	Surface Mount
Pitch	1.27mm (50mil)
SVHC Present	Not Present
Width	3.9mm (150mil)

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CH9328 Description

Short technical summary and product information.

The CH9328 from WCH is a versatile USB Interface IC designed to act as a serial UART to HID keyboard chip. It allows for one-way data transmission, receiving serial UART data and packaging it into a standard keyboard code for upload to a computer via USB. This chip is compatible with USB 2.0 at a 12Mbps full-speed interface and features a built-in crystal oscillator.

The CH9328 supports both 3.3V and 5V supply voltages and offers a default serial communication baud rate of 9600bps, with support for multiple serial communication formats and common baud rate settings. Users can configure the chip's VID, PID, and various string descriptors using provided Windows software. It complies with USB and HID device specifications and can simulate full keyboard functions.

Packaged in a RoHS compliant SOP-16 lead-free package, the CH9328 is suitable for surface mount applications. Its pinout includes VCC, GND, V3, USB signal pins (UD+, UD-), a reset input (RSTI), a UART transmit status output (T_LED), and configurable I/O pins (IO3, IO4).

This chip is ideal for projects requiring the integration of serial data input into a computer as keyboard input, such as custom input devices, industrial control interfaces, or embedded systems needing keyboard emulation.

CH9328 Quick Information

Product Type: USB Interface IC

Canonical Name: CH9328 UART to HID Keyboard Chip

Subcategory: USB Interface IC

CH9328 Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

CH9328 Estimated Pricing

Qty	Low	High
1+	$3.89	$3.89

Estimated market price range - modelled values for guidance only, not live distributor offers.

CH9328 Features

Converts UART serial data to USB HID keyboard.
Supports 12Mbps full-speed USB 2.0.
Operates at 3.3V and 5V supply voltages.
Configurable VID, PID, and string descriptors.
RoHS compliant SOP-16 package for surface mounting.

CH9328 Applications

Custom keyboard and input device creation.
Embedded systems requiring keyboard emulation.
Industrial control panel interfaces.
Data logging with keyboard input simulation.
Prototyping serial to USB HID projects.

CH9328 FAQs

7 frequently asked questions generated from this part’s specifications.

What USB protocol does the CH9328 support?

USB 2.0.

What is the data rate of the CH9328?

12 Mbps.

What is the supply voltage range for the CH9328?

The CH9328 operates at 3.3V or 5V.

How many drivers and receivers does the CH9328 have?

1 driver and 1 receiver.

What is the default serial baud rate?

9600 bps.

What package does the CH9328 come in?

SOP-16 surface mount package.

What is the mounting type?

Surface mount.