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CH9104L

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WCH Jiangsu Qin Heng USB Converters, LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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CH9104L

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

CH9104L from WCH Jiangsu Qin Heng, in a LQFP-48(7x7). 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 GND power_in Common ground; must be connected to the USB bus ground line.
2 LOWPWR bidirectional USB suspend status output, active low (high in normal operation, low when suspended); if an external pull-down is detected at power-up, the output polarity is switched; tolerates 5 V when used as input.
3 DSR3/GPIO32 bidirectional UART3 modem input Data Set Ready, active low; general-purpose I/O GPIO32.
4 GND power_in Common ground; must be connected to the USB bus ground line.
5 VCC power_in Positive supply input, 3.0 V to 3.6 V (typ. 3.3 V); requires an external decoupling capacitor of about 0.1 uF to ground.
6 RTS0/TNOW0/GPIO05 bidirectional UART0 modem output RTS, active low, or RS485 TNOW transmit/receive control if a pull-down is present at power-up; general-purpose I/O GPIO05; tolerates 5 V when used as input.
7 CTS0/GPIO04 bidirectional UART0 modem input CTS, active low; general-purpose I/O GPIO04; tolerates 5 V when used as input.
8 TXD1 output UART1 serial data output; idles high.
9 RXD1 input UART1 serial data input with internal pull-up; idles high.
10 RTS1/TNOW1/GPIO15 bidirectional UART1 modem output RTS, active low, or RS485 TNOW transmit/receive control if a pull-down is present at power-up; general-purpose I/O GPIO15; tolerates 5 V when used as input.
11 CTS1/GPIO14 bidirectional UART1 modem input CTS, active low; general-purpose I/O GPIO14; tolerates 5 V when used as input.
12 DTR1/GPIO13 bidirectional UART1 modem output DTR, active low; at power-up, a pull-down on this pin enables hardware flow control on all UARTs; general-purpose I/O GPIO13; tolerates 5 V when used as input.
13 DSR1/GPIO12 bidirectional UART1 modem input Data Set Ready, active low; general-purpose I/O GPIO12.
14 DCD1/GPIO11 bidirectional UART1 modem input Data Carrier Detect, active low; general-purpose I/O GPIO11.
15 RI1/RWK1/GPIO10 bidirectional UART1 modem input Ring Indicator, active low; USB wake-up event input 1, active low with internal pull-up; general-purpose I/O GPIO10.
16 DTR0/GPIO03 bidirectional UART0 modem output DTR, active low; if an external pull-down is present at power-up, the EEPROM configuration is disabled and the chip default parameters are used; general-purpose I/O GPIO03.
17 DSR0/GPIO02 bidirectional UART0 modem input Data Set Ready, active low; general-purpose I/O GPIO02.
18 VCC power_in Positive supply input, 3.0 V to 3.6 V (typ. 3.3 V); requires an external decoupling capacitor of about 0.1 uF to ground.
19 GND power_in Common ground; must be connected to the USB bus ground line.
20 DCD0/GPIO01 bidirectional UART0 modem input Data Carrier Detect, active low; general-purpose I/O GPIO01.
21 RI0/RWK0/GPIO00 bidirectional UART0 modem input Ring Indicator, active low; USB wake-up event input 0, active low with internal pull-up; general-purpose I/O GPIO00.
22 TXD2 output UART2 serial data output; idles high.
23 RXD2 input UART2 serial data input with internal pull-up; idles high.
24 RTS2/TNOW2/GPIO25 bidirectional UART2 modem output RTS, active low, or RS485 TNOW transmit/receive control if a pull-down is present at power-up; general-purpose I/O GPIO25.
25 CTS2/GPIO24 bidirectional UART2 modem input CTS, active low; general-purpose I/O GPIO24.
26 DTR2/GPIO23 bidirectional UART2 modem output DTR, active low; general-purpose I/O GPIO23.
27 DSR2/GPIO22 bidirectional UART2 modem input Data Set Ready, active low; general-purpose I/O GPIO22.
28 DCD2/GPIO21 bidirectional UART2 modem input Data Carrier Detect, active low; general-purpose I/O GPIO21.
29 RI2/RWK2/GPIO20 bidirectional UART2 modem input Ring Indicator, active low; USB wake-up event input 2, active low with internal pull-up; general-purpose I/O GPIO20; tolerates 5 V when used as input.
30 TXD0 output UART0 serial data output; idles high.
31 RXD0 input UART0 serial data input with internal pull-up; idles high; tolerates 5 V when used as input.
32 GND power_in Common ground; must be connected to the USB bus ground line.
33 VCC power_in Positive supply input, 3.0 V to 3.6 V (typ. 3.3 V); requires an external decoupling capacitor of about 0.1 uF to ground.
34 DCD3/GPIO31 bidirectional UART3 modem input Data Carrier Detect, active low; general-purpose I/O GPIO31; tolerates 5 V when used as input.
35 CFG0 input Remote wake-up and USB power mode configuration pin 0; tolerates 5 V when used as input.
36 CFG1 input Remote wake-up and USB power mode configuration pin 1; tolerates 5 V when used as input.
37 RI3/RWK3/GPIO30 bidirectional UART3 modem input Ring Indicator, active low; USB wake-up event input 3, active low with internal pull-up; general-purpose I/O GPIO30; tolerates 5 V when used as input.
38 TXD3 output UART3 serial data output; idles high.
39 RXD3 input UART3 serial data input with internal pull-up; idles high; tolerates 5 V when used as input.
40 GND power_in Common ground; must be connected to the USB bus ground line.
41 GND power_in Common ground; must be connected to the USB bus ground line.
42 UD- bidirectional USB D- data line, connected directly to the USB bus; no series resistor may be added.
43 UD+ bidirectional USB D+ data line, connected directly to the USB bus; no series resistor may be added.
44 NC unconnected No connection; must be left floating.
45 VCC power_in Positive supply input, 3.0 V to 3.6 V (typ. 3.3 V); requires an external decoupling capacitor of about 0.1 uF to ground.
46 RTS3/TNOW3/GPIO35 bidirectional UART3 modem output RTS, active low, or RS485 TNOW transmit/receive control if a pull-down is present at power-up; general-purpose I/O GPIO35; tolerates 5 V when used as input.
47 CTS3/GPIO34 bidirectional UART3 modem input CTS, active low; general-purpose I/O GPIO34; tolerates 5 V when used as input.
48 DTR3/GPIO33 bidirectional UART3 modem output DTR, active low; general-purpose I/O GPIO33; tolerates 5 V when used as input.

Key specifications

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

CAD (KiCad official)

  • Symbol: CH9104L
  • Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
  • 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
  • 3D model files: ch9104l-etched.step / ch9104l-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch9104l.step / ch9104l.glb are the bare package body.

Provenance

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

  • Datasheet: WCH Jiangsu Qin Heng datasheet (7 pp, sha256 4c6ffbf98d4337ee, retrieved 2026-10-19, 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