component

CH348L

Public Made by Adom

by adom

WCH Jiangsu Qin Heng USB Converters, LQFP-100(14x14). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentinterfacech348lfactory-2.0.0extractor-text
Overview Files Discover Packages Releases Dependencies Issues Breadcrumbs Pull Requests Activity

3D Model

Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.

Symbol & Footprint

Schematic Symbol

Open full view ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.

PCB Footprint

Open full view ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.

Datasheet

Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Download PDF
Contents

README

markdown

CH348L

WCH Jiangsu Qin Heng · USB Converters · LQFP-100(14x14)

CH348L from WCH Jiangsu Qin Heng, in a LQFP-100(14x14). 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 DCD5/GPIO40 bidirectional UART5 MODEM carrier-detect input, active low, also general-purpose GPIO40; the input is 5V tolerant (FT).
2 RI5/GPIO41 bidirectional UART5 MODEM ring-indicator input, active low, also general-purpose GPIO41; the input is 5V tolerant (FT).
3 DSR1/GPIO27 bidirectional UART1 MODEM data-set-ready input, active low, also general-purpose GPIO27; the input is 5V tolerant (FT).
4 DCD1/GPIO28 bidirectional UART1 MODEM carrier-detect input, active low, also general-purpose GPIO28; the input is 5V tolerant (FT).
5 RI1/GPIO29 bidirectional UART1 MODEM ring-indicator input, active low, also general-purpose GPIO29; the input is 5V tolerant (FT).
6 NC unconnected No-connect pin; must be left floating.
7 CFG input Configuration pin selecting whether all DTRx/TNOWx pins (unified) or individual pins (via pull-down resistors) use the TNOW or DTR function, sampled at power-on.
8 NC unconnected No-connect pin; must be left floating.
9 NC unconnected No-connect pin; must be left floating.
10 GND power_in Common ground; must be connected to the USB bus ground.
11 VCC power_in Main 3.3V supply input (3.0V to 3.6V); requires an external decoupling capacitor of about 0.1uF to GND.
12 XI input Crystal oscillator input; an 8MHz crystal with about 22pF load capacitors to GND is required between XI and XO.
13 XO output Crystal oscillator inverting output; connect the 8MHz crystal between XI and XO with about 22pF to GND.
14 RESET input External reset input, active low, with an internal pull-up resistor (RPU about 40K typical).
15 TXD5 output UART5 serial data output, idle high.
16 RXD5 input UART5 serial data input with internal pull-up.
17 TXD6 output UART6 serial data output, idle high.
18 RXD6 input UART6 serial data input with internal pull-up.
19 GND power_in Common ground; must be connected to the USB bus ground.
20 GND power_in Common ground; must be connected to the USB bus ground.
21 VIO power_in I/O port supply input for the serial and MODEM pins, supporting 1.8V, 2.5V or 3.3V (1.7V to 3.6V); requires an external decoupling capacitor.
22 VIO power_in I/O port supply input for the serial and MODEM pins, supporting 1.8V, 2.5V or 3.3V (1.7V to 3.6V); requires an external decoupling capacitor.
23 CTS1/GPIO2 bidirectional UART1 MODEM clear-to-send input, active low, also general-purpose GPIO2.
24 RTS1/GPIO3 bidirectional UART1 MODEM request-to-send output, active low, also general-purpose GPIO3.
25 TXD1 output UART1 serial data output, idle high.
26 RXD1 input UART1 serial data input with internal pull-up.
27 GND power_in Common ground; must be connected to the USB bus ground.
28 VCC power_in Main 3.3V supply input (3.0V to 3.6V); requires an external decoupling capacitor of about 0.1uF to GND.
29 ACT output USB configuration-complete status output, active low.
30 DTR1/TNOW1/GPIO9 bidirectional UART1 MODEM data-terminal-ready output, active low, or RS485 TNOW transmit-status output, also general-purpose GPIO9, selected by CFG at power-on.
31 CTS6/GPIO16 bidirectional UART6 MODEM clear-to-send input, active low, also general-purpose GPIO16.
32 RTS6/GPIO17 bidirectional UART6 MODEM request-to-send output, active low, also general-purpose GPIO17.
33 TXD7 output UART7 serial data output, idle high.
34 RXD7 input UART7 serial data input with internal pull-up; the input is 5V tolerant (FT).
35 CTS7/GPIO18 bidirectional UART7 MODEM clear-to-send input, active low, also general-purpose GPIO18.
36 RTS7/GPIO19 bidirectional UART7 MODEM request-to-send output, active low, also general-purpose GPIO19.
37 GND power_in Common ground; must be connected to the USB bus ground.
38 DSR7/GPIO45 bidirectional UART7 MODEM data-set-ready input, active low, also general-purpose GPIO45; the input is 5V tolerant (FT).
39 DCD7/GPIO46 bidirectional UART7 MODEM carrier-detect input, active low, also general-purpose GPIO46; the input is 5V tolerant (FT).
40 RI7/GPIO47 bidirectional UART7 MODEM ring-indicator input, active low, also general-purpose GPIO47; the input is 5V tolerant (FT).
41 DSR6/GPIO42 bidirectional UART6 MODEM data-set-ready input, active low, also general-purpose GPIO42; the input is 5V tolerant (FT).
42 DCD6/GPIO43 bidirectional UART6 MODEM carrier-detect input, active low, also general-purpose GPIO43; the input is 5V tolerant (FT).
43 RI6/GPIO44 bidirectional UART6 MODEM ring-indicator input, active low, also general-purpose GPIO44; the input is 5V tolerant (FT).
44 DSR3/GPIO33 bidirectional UART3 MODEM data-set-ready input, active low, also general-purpose GPIO33; the input is 5V tolerant (FT).
45 DCD3/GPIO34 bidirectional UART3 MODEM carrier-detect input, active low, also general-purpose GPIO34; the input is 5V tolerant (FT).
46 RI3/GPIO35 bidirectional UART3 MODEM ring-indicator input, active low, also general-purpose GPIO35; the input is 5V tolerant (FT).
47 TXD2 output UART2 serial data output, idle high.
48 RXD2 input UART2 serial data input with internal pull-up; the input is 5V tolerant (FT).
49 GND power_in Common ground; must be connected to the USB bus ground.
50 VIO power_in I/O port supply input for the serial and MODEM pins, supporting 1.8V, 2.5V or 3.3V (1.7V to 3.6V); requires an external decoupling capacitor.
51 CTS3/GPIO6 bidirectional UART3 MODEM clear-to-send input, active low, also general-purpose GPIO6; the input is 5V tolerant (FT).
52 CTS2/GPIO4 bidirectional UART2 MODEM clear-to-send input, active low, also general-purpose GPIO4; the input is 5V tolerant (FT).
53 RTS2/GPIO5 bidirectional UART2 MODEM request-to-send output, active low, also general-purpose GPIO5.
54 RTS3/GPIO7 bidirectional UART3 MODEM request-to-send output, active low, also general-purpose GPIO7.
55 DSR2/GPIO30 bidirectional UART2 MODEM data-set-ready input, active low, also general-purpose GPIO30; the input is 5V tolerant (FT).
56 DCD2/GPIO31 bidirectional UART2 MODEM carrier-detect input, active low, also general-purpose GPIO31; the input is 5V tolerant (FT).
57 RI2/GPIO32 bidirectional UART2 MODEM ring-indicator input, active low, also general-purpose GPIO32; the input is 5V tolerant (FT).
58 NC unconnected No-connect pin; must be left floating.
59 NC unconnected No-connect pin; must be left floating.
60 DSR0/GPIO24 bidirectional UART0 MODEM data-set-ready input, active low, also general-purpose GPIO24; the input is 5V tolerant (FT).
61 DCD0/GPIO26 bidirectional UART0 MODEM carrier-detect input, active low, also general-purpose GPIO26; the input is 5V tolerant (FT).
62 RI0/GPIO25 bidirectional UART0 MODEM ring-indicator input, active low, also general-purpose GPIO25; the input is 5V tolerant (FT).
63 DTR4/TNOW4/GPIO20 bidirectional UART4 MODEM data-terminal-ready output, active low, or RS485 TNOW transmit-status output, also general-purpose GPIO20; the pin is powered from VCC at 3.3V signal level.
64 DTR5/TNOW5/GPIO21 bidirectional UART5 MODEM data-terminal-ready output, active low, or RS485 TNOW transmit-status output, also general-purpose GPIO21; the pin is powered from VCC at 3.3V signal level.
65 DTR6/TNOW6/GPIO22 bidirectional UART6 MODEM data-terminal-ready output, active low, or RS485 TNOW transmit-status output, also general-purpose GPIO22; the pin is powered from VCC at 3.3V signal level.
66 DTR7/TNOW7/GPIO23 bidirectional UART7 MODEM data-terminal-ready output, active low, or RS485 TNOW transmit-status output, also general-purpose GPIO23; the pin is powered from VCC at 3.3V signal level.
67 DTR2/TNOW2/GPIO10 bidirectional UART2 MODEM data-terminal-ready output, active low, or RS485 TNOW transmit-status output, also general-purpose GPIO10; the input is 5V tolerant (FT).
68 TXD0 output UART0 serial data output, idle high.
69 RXD0 input UART0 serial data input with internal pull-up; the input is 5V tolerant (FT).
70 CTS0/GPIO0 bidirectional UART0 MODEM clear-to-send input, active low, also general-purpose GPIO0; the input is 5V tolerant (FT).
71 RTS0/GPIO1 bidirectional UART0 MODEM request-to-send output, active low, also general-purpose GPIO1; if a pull-down is detected on this pin at power-on, the internal EEPROM configuration is disabled and default parameters are used.
72 DTR0/TNOW0/GPIO8 bidirectional UART0 MODEM data-terminal-ready output, active low, or RS485 TNOW transmit-status output, also general-purpose GPIO8; the input is 5V tolerant (FT).
73 NC unconnected No-connect pin; must be left floating.
74 GND power_in Common ground; must be connected to the USB bus ground.
75 VCC power_in Main 3.3V supply input (3.0V to 3.6V); requires an external decoupling capacitor of about 0.1uF to GND.
76 TX_S output Serial transmit status output; pulses with a 200ms period while any UART is transmitting data.
77 RX_S output Serial receive status output; pulses with a 200ms period while any UART is receiving data.
78 TXD3 output UART3 serial data output, idle high.
79 RXD3 input UART3 serial data input with internal pull-up.
80 TXD4 output UART4 serial data output, idle high.
81 NC unconnected No-connect pin; must be left floating.
82 NC unconnected No-connect pin; must be left floating.
83 RXD4 input UART4 serial data input with internal pull-up; the input is 5V tolerant (FT).
84 NC unconnected No-connect pin; must be left floating.
85 NC unconnected No-connect pin; must be left floating.
86 DSR4/GPIO36 bidirectional UART4 MODEM data-set-ready input, active low, also general-purpose GPIO36; the input is 5V tolerant (FT).
87 DCD4/GPIO37 bidirectional UART4 MODEM carrier-detect input, active low, also general-purpose GPIO37; the input is 5V tolerant (FT).
88 RI4/GPIO38 bidirectional UART4 MODEM ring-indicator input, active low, also general-purpose GPIO38; the input is 5V tolerant (FT).
89 DTR3/TNOW3/GPIO11 bidirectional UART3 MODEM data-terminal-ready output, active low, or RS485 TNOW transmit-status output, also general-purpose GPIO11; the input is 5V tolerant (FT).
90 CTS4/GPIO12 bidirectional UART4 MODEM clear-to-send input, active low, also general-purpose GPIO12; the input is 5V tolerant (FT).
91 RTS4/GPIO13 bidirectional UART4 MODEM request-to-send output, active low, also general-purpose GPIO13.
92 UD- bidirectional USB D- data line, connected directly to the USB bus with no series resistor allowed.
93 UD+ bidirectional USB D+ data line, connected directly to the USB bus with no series resistor allowed.
94 TEST input Internal test pin; connect to ground through a pull-down of about 4.7K or directly to ground.
95 CTS5/GPIO14 bidirectional UART5 MODEM clear-to-send input, active low, also general-purpose GPIO14; the input is 5V tolerant (FT).
96 RTS5/GPIO15 bidirectional UART5 MODEM request-to-send output, active low, also general-purpose GPIO15.
97 NC unconnected No-connect pin; must be left floating.
98 DSR5/GPIO39 bidirectional UART5 MODEM data-set-ready input, active low, also general-purpose GPIO39; the input is 5V tolerant (FT).
99 GND power_in Common ground; must be connected to the USB bus ground.
100 VIO power_in I/O port supply input for the serial and MODEM pins, supporting 1.8V, 2.5V or 3.3V (1.7V to 3.6V); requires an external decoupling capacitor.

Key specifications

Parameter Value
Manufacturer WCH Jiangsu Qin Heng
Package LQFP-100(14x14)
Category Interface
Pins 100

Electrical characteristics

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

Parameter Symbol Min Typ Max Unit Conditions Page
Operating ambient temperature TA -40 85 ℃ 7
Storage ambient temperature TS -40 125 ℃ 7
Power supply voltage (VCC pin, GND grounded) VCC -0.3 4 V 7
Serial I/O power supply voltage VIO -0.3 4 V 7
Voltage on USB signal pins VUSB -0.5 3.8 V 7
Voltage on 5V-tolerant serial pins VIO5V -0.5 5.6 V 7
Power supply voltage (VCC pin) VCC 3 3.3 3.6 V TA=25℃, VCC=3.3V, excluding USB pins 8
Serial I/O power supply voltage VIO 1.7 3.3 3.6 V TA=25℃, VCC=3.3V, excluding USB pins 8
Operating supply current, chip normal working ICC 28 40 55 mA TA=25℃, VCC=3.3V, excluding USB pins 8
Supply current, USB suspend ISLP 180 260 360 uA TA=25℃, VCC=3.3V, excluding USB pins 8
Low-level input voltage VIL 0 0.8 V TA=25℃, VCC=3.3V, excluding USB pins 8
High-level input voltage VIH 2 V TA=25℃, VCC=3.3V, excluding USB pins 8
High-level input voltage, 5V-tolerant pins VIH5 2 5 V TA=25℃, VCC=3.3V, excluding USB pins 8
Output low voltage VOL 0.4 V Single pin sinks 8mA current; TA=25℃, VCC=3.3V, excluding USB pins 8
Built-in pull-up equivalent resistance RPU 30 40 60 KΩ TA=25℃, VCC=3.3V, excluding USB pins 8
Power-on/power-down reset threshold voltage VPOR 1.9 2.2 2.5 V TA=25℃, VCC=3.3V, excluding USB pins 8
ESD withstand voltage (human body model, non-contact) VESD 4 KV TA=25℃, VCC=3.3V, excluding USB pins 8
Reset delay after power-on or external reset input TRSTD 15 30 40 mS TA=25℃, VCC=3.3V 8
USB auto-suspend detection time TSUSP 3 5 9 mS TA=25℃, VCC=3.3V 8
Wake-up completion time after sleep TWAKE 0.3 0.5 4 mS TA=25℃, VCC=3.3V 8

CAD (KiCad official)

  • Symbol: CH348L
  • Footprint: Package_QFP:LQFP-100_14x14mm_P0.5mm
  • 3D model: LQFP-100(14x14) (KiCad packages3D, STEP)
  • 3D model files: ch348l-etched.step / ch348l-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch348l.step / ch348l.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 c3adc4a554e74be4, 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