component
CH340B
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WCH Jiangsu Qin Heng USB Converters, SOP-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownCH340B
WCH Jiangsu Qin Heng · USB Converters · SOP-16
CH340B from WCH Jiangsu Qin Heng, in a SOP-16. 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 | GND | power_in | Common ground, directly connected to USB bus ground line. |
| 2 | TXD | output | Serial data output with idle state high level for CH340C/N/E/X/B/T. |
| 3 | RXD | input | Serial data input with built-in controllable pull-up and pull-down resistors. |
| 4 | V3 | power_in | 3.3V power supply connection for external power input (3.3V mode) or 0.1µF power decoupling capacitor (5V mode). |
| 5 | UD+ | bidirectional | Direct connection to USB bus D+ data line, do not add series resistor. |
| 6 | UD- | bidirectional | Direct connection to USB bus D- data line, do not add series resistor. |
| 7 | RST# | input | External reset input, active low with internal pull-up resistor (CH340B only). |
| 8 | NC | unconnected | No connection, empty pin must be left floating (CH340B only). |
| 9 | CTS# | input | MODEM contact input signal for clear to send, active low or high per software definition. |
| 10 | DSR# | input | MODEM contact input signal for data set ready, active low or high per software definition. |
| 11 | RI# | input | MODEM contact input signal for ring indicator, active low or high per software definition. |
| 12 | DCD# | input | MODEM contact input signal for carrier detect, active low or high per software definition. |
| 13 | DTR# | output | MODEM contact output signal for data terminal ready, active low or high per software definition. |
| 14 | RTS# | output | MODEM contact output signal for request to send, active low or high per software definition. |
| 15 | TNOW | output | Serial port transmission in progress status indicator, active high level (CH340T/E/X/B). |
| 16 | VCC | power_in | Positive power supply input, requires external 0.1µF power decoupling capacitor. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | WCH Jiangsu Qin Heng |
| Package | SOP-16 |
| Category | Interface |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
CH340B - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOP-16 (KiCad packages3D, STEP)
- 3D model files:
ch340b-etched.step/ch340b-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ch340b.step/ch340b.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: WCH Jiangsu Qin Heng datasheet (10 pp, sha256
6a6922d3c4de2d4f, 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, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).