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CH344Q

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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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CH344Q

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

CH344Q 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 NC unconnected No internal connection; must be left floating (禁止连接，必须悬空).
2 DSR2 input UART2 modem input, data set ready, active low.
3 RI2 input UART2 modem input, ring indicator, active low.
4 DCD2 input UART2 modem input, carrier detect, active low.
5 XI input Crystal oscillator input; 8MHz crystal between XI and XO with about 22pF load capacitors to GND.
6 XO output Crystal oscillator inverting output; 8MHz crystal between XI and XO with about 22pF load capacitor to GND.
7 RESET input External reset input, active low, with internal pull-up (typical 30 ms reset delay after power-up or reset input).
8 GND power_in Common ground; must be connected to the USB bus ground.
9 VCC power_in Positive supply input, 3.0 V to 3.6 V (3.3 V typical); needs external 0.1uF decoupling capacitor.
10 CTS1/GPIO2 bidirectional UART1 modem input, clear to send, active low; also general-purpose GPIO2.
11 RTS1/GPIO3 bidirectional UART1 modem output, request to send, active low; also general-purpose GPIO3.
12 TXD1 output UART1 serial data output; idle state high.
13 RXD1 input UART1 serial data input with internal pull-up.
14 ACT/CFG/DCD3 output USB configured status output, active low, also hardware flow-control enable with internal pull-up; when RTS3 is strapped low at power-up it becomes the UART3 DCD3 carrier-detect input, active low.
15 TX_S/RI3 output Serial transmit status output (200 ms pulse while any UART is sending); when RTS3 is strapped low at power-up it becomes the UART3 RI3 ring-indicator input, active low.
16 RX_S/DSR3 output Serial receive status output (200 ms pulse while any UART is receiving); when RTS3 is strapped low at power-up it becomes the UART3 DSR3 data-set-ready input, active low.
17 DSR1 input UART1 modem input, data set ready, active low.
18 DTR1/TNOW1/GPIO9 bidirectional UART1 modem output DTR, active low, or RS485 TNOW1 direction control per power-up strap (pull-down selects TNOW); also general-purpose GPIO9.
19 DTR2/TNOW2/GPIO10 bidirectional UART2 modem output DTR, active low, or RS485 TNOW2 direction control per power-up strap (pull-down selects TNOW); also general-purpose GPIO10.
20 GND power_in Common ground; must be connected to the USB bus ground.
21 TXD2 output UART2 serial data output; idle state high.
22 RXD2 input UART2 serial data input with internal pull-up; input is 5V tolerant (FT).
23 GND power_in Common ground; must be connected to the USB bus ground.
24 VCC power_in Positive supply input, 3.0 V to 3.6 V (3.3 V typical); needs external 0.1uF decoupling capacitor.
25 RI1 input UART1 modem input, ring indicator, active low; input is 5V tolerant (FT).
26 CTS2/GPIO4 bidirectional UART2 modem input, clear to send, active low; also general-purpose GPIO4.
27 RTS2/GPIO5 bidirectional UART2 modem output, request to send, active low; also general-purpose GPIO5.
28 DCD1/GPIO15 bidirectional UART1 modem input, carrier detect, active low; input is 5V tolerant (FT); also general-purpose GPIO15.
29 DSR0/GPIO14 bidirectional UART0 modem input, data set ready, active low; input is 5V tolerant (FT); also general-purpose GPIO14.
30 TXD0 output UART0 serial data output; idle state high.
31 RXD0 input UART0 serial data input with internal pull-up; input is 5V tolerant (FT).
32 RI0/GPIO13 bidirectional UART0 modem input, ring indicator, active low; input is 5V tolerant (FT); also general-purpose GPIO13.
33 DCD0/GPIO12 bidirectional UART0 modem input, carrier detect, active low; input is 5V tolerant (FT); also general-purpose GPIO12.
34 DTR3/TNOW3/GPIO11 bidirectional UART3 modem output DTR, active low, or RS485 TNOW3 direction control per power-up strap (pull-down selects TNOW); input is 5V tolerant (FT); also general-purpose GPIO11.
35 GND power_in Common ground; must be connected to the USB bus ground.
36 VCC power_in Positive supply input, 3.0 V to 3.6 V (3.3 V typical); needs external 0.1uF decoupling capacitor.
37 TXD3 output UART3 serial data output; idle state high.
38 RXD3 input UART3 serial data input; requires an external pull-up resistor (no internal pull-up); input is 5V tolerant (FT).
39 DTR0/TNOW0/GPIO8 bidirectional UART0 modem output DTR, active low, or RS485 TNOW0 direction control per power-up strap (pull-down selects TNOW); input is 5V tolerant (FT); also general-purpose GPIO8.
40 RTS0/GPIO1 bidirectional UART0 modem output, request to send, active low; a pull-down at power-up disables EEPROM parameters and enables built-in defaults; also general-purpose GPIO1.
41 CTS0/GPIO0 bidirectional UART0 modem input, clear to send, active low; input is 5V tolerant (FT); also general-purpose GPIO0.
42 UD- bidirectional USB D- data line connected directly to the USB bus; no series resistor allowed.
43 UD+ bidirectional USB D+ data line connected directly to the USB bus; no series resistor allowed.
44 TEST input Internal test pin; connect to GND through a pull-down resistor (typically 4.7 kΩ) or tie directly to GND.
45 RTS3/GPIO7 bidirectional UART3 modem output, request to send, active low; a pull-down at power-up enables DCD3/RI3/DSR3 on pins 14/15/16; also general-purpose GPIO7.
46 CTS3/GPIO6 bidirectional UART3 modem input, clear to send, active low; input is 5V tolerant (FT); also general-purpose GPIO6.
47 GND power_in Common ground; must be connected to the USB bus ground.
48 VCC power_in Positive supply input, 3.0 V to 3.6 V (3.3 V typical); needs external 0.1uF decoupling capacitor.

Key specifications

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

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Ambient temperature, operating TA -40 85 ℃ 6
Ambient temperature, storage TS -40 105 ℃ 6
Supply voltage, absolute maximum VCC -0.3 4 V VCC pin supplied, GND pin grounded 6
Voltage on USB signal pins VUSB -0.5 3.8 V 6
Voltage on 5V-tolerant serial pins VIO5V -0.5 5.6 V 6
Voltage on serial and other pins VUART -0.5 V 6
Supply voltage VCC 3 3.3 3.6 V TA=25℃, VCC=3.3V, excluding USB pins; VCC pin supplied, GND grounded 7
Operating supply current, CH344Q ICC 27 37 50 mA TA=25℃, VCC=3.3V, excluding USB pins; normal operation 7
USB suspend supply current, CH344Q ISLP 160 230 320 uA TA=25℃, VCC=3.3V, excluding USB pins; USB suspended 7
Low-level input voltage VIL 0 0.8 V TA=25℃, VCC=3.3V, excluding USB pins 7
High-level input voltage VIH 2 V TA=25℃, VCC=3.3V, excluding USB pins 7
High-level input voltage, 5V-tolerant pins VIH5 2 5 V TA=25℃, VCC=3.3V, excluding USB pins 7
Output low voltage VOL 0.4 V Single pin sinking 8mA 7
Equivalent resistance of internal pull-up RPU 30 40 60 KΩ TA=25℃, VCC=3.3V, excluding USB pins 7
Power-on/power-down reset threshold voltage VPOR 1.9 2.2 2.5 V TA=25℃, VCC=3.3V, excluding USB pins 7
ESD withstand voltage, CH344Q VESD 3 KV Human body model, non-contact 7
Reset delay after power-on or external reset TRSTD 15 30 45 mS TA=25℃, VCC=3.3V 7
USB auto-suspend detection time TSUSP 3 5 9 mS TA=25℃, VCC=3.3V 7
Wake-up completion time after chip sleep TWAKE 0.3 0.5 4 mS TA=25℃, VCC=3.3V 7

CAD (KiCad official)

  • Symbol: CH344Q
  • Footprint: Package_QFP:LQFP-48_7x7mm_P0.5mm
  • 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
  • 3D model files: ch344q-etched.step / ch344q-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch344q.step / ch344q.glb are the bare package body.

Provenance

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

  • Datasheet: WCH Jiangsu Qin Heng datasheet (8 pp, sha256 9044ddf347f308c1, retrieved 2026-10-18, 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