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CH348Q

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WCH Jiangsu Qin Heng USB Converters, LQFP-48(7x7). Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Symbol & Footprint

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Contents

README

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CH348Q

WCH Jiangsu Qin Heng · USB Converters · LQFP-48(7x7)

CH348Q from WCH Jiangsu Qin Heng, in a LQFP-48(7x7). 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 NC unconnected No connection, must be left floating.
2 CFG input TNOW and DTR function configuration pin; high/floating during power-up configures all DTRx/TNOWx as TNOW function; low configures as DTR function with optional independent configuration via pull-down resistors.
3 NC unconnected No connection, must be left floating.
4 NC unconnected No connection, must be left floating.
5 XI input Crystal oscillator input for 8MHz clock generation.
6 XO output Crystal oscillator reverse phase output for 8MHz clock generation.
7 RESET input External reset input, active low, internal pull-up resistor.
8 GND power_in Common ground connection to USB bus ground.
9 VCC power_in Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor.
10 CTS1/GPIO2 input UART1 Clear To Send MODEM input signal, active low; general purpose GPIO2 for input or output.
11 RTS1/GPIO3 output UART1 Request To Send MODEM output signal, active low; general purpose GPIO3 for input or output.
12 TXD1 output UART1 serial data output, idle state high level.
13 RXD1 input UART1 serial data input, internal pull-up resistor.
14 ACT output USB configuration complete status output, active low.
15 DTR1/TNOW1/GPIO9 bidirectional UART1 Data Terminal Ready MODEM output signal active low; UART1 RS485 transmit/receive control pin; general purpose GPIO9 for input or output.
16 TXD6 output UART6 serial data output, idle state high level.
17 RXD6 input UART6 serial data input, internal pull-up resistor.
18 TXD3 output UART3 serial data output, idle state high level.
19 RXD3 input UART3 serial data input, internal pull-up resistor.
20 GND power_in Common ground connection to USB bus ground.
21 TXD2 output UART2 serial data output, idle state high level.
22 RXD2 input UART2 serial data input, internal pull-up resistor, 5V tolerant.
23 GND power_in Common ground connection to USB bus ground.
24 VCC power_in Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor.
25 CTS3/GPIO6 input UART3 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO6 for input or output.
26 CTS2/GPIO4 input UART2 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO4 for input or output.
27 RTS2/GPIO5 output UART2 Request To Send MODEM output signal, active low; general purpose GPIO5 for input or output.
28 RTS3/GPIO7 output UART3 Request To Send MODEM output signal, active low; general purpose GPIO7 for input or output.
29 DTR2/TNOW2/GPIO10 bidirectional UART2 Data Terminal Ready MODEM output signal active low; UART2 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO10 for input or output.
30 TXD0 output UART0 serial data output, idle state high level.
31 RXD0 input UART0 serial data input, internal pull-up resistor, 5V tolerant.
32 CTS0/GPIO0 input UART0 Clear To Send MODEM input signal active low, 5V tolerant; general purpose GPIO0 for input or output.
33 RTS0/GPIO1 output UART0 Request To Send MODEM output signal, active low; external pull-down on this pin during power-up disables internal EEPROM configuration and enables default parameters; general purpose GPIO1 for input or output.
34 DTR0/TNOW0/GPIO8 bidirectional UART0 Data Terminal Ready MODEM output signal active low; UART0 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO8 for input or output.
35 GND power_in Common ground connection to USB bus ground.
36 VCC power_in Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor.
37 TXD7 output UART7 serial data output, idle state high level.
38 RXD7 input UART7 serial data input, internal pull-up resistor, 5V tolerant.
39 DTR3/TNOW3/GPIO11 bidirectional UART3 Data Terminal Ready MODEM output signal active low; UART3 RS485 transmit/receive control pin; 5V tolerant; general purpose GPIO11 for input or output.
40 TXD4 output UART4 serial data output, idle state high level.
41 RXD4 input UART4 serial data input, internal pull-up resistor, 5V tolerant.
42 UD- passive USB bus D- differential data signal, direct connection to USB connector without series resistor.
43 UD+ passive USB bus D+ differential data signal, direct connection to USB connector without series resistor.
44 TEST input Internal test pin, recommend connecting 4.7kΩ pull-down resistor to ground or direct ground connection.
45 TXD5 output UART5 serial data output, idle state high level.
46 RXD5 input UART5 serial data input, internal pull-up resistor.
47 GND power_in Common ground connection to USB bus ground.
48 VCC power_in Positive power supply input 3.3V, requires external 0.1µF decoupling capacitor.

Key specifications

Parameter Value
Manufacturer WCH Jiangsu Qin Heng
Package LQFP-48(7x7)
Category Interface
Pins 48

CAD (KiCad official)

  • Symbol: CH348Q
  • Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
  • 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
  • 3D model files: ch348q-etched.step / ch348q-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch348q.step / ch348q.glb are the bare package body.

Provenance

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

  • Datasheet: WCH Jiangsu Qin Heng datasheet (9 pp, sha256 df5440c74e6a0dfe, retrieved 2026-09-17, 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 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (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