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CH9329

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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.

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CH9329

WCH Jiangsu Qin Heng · USB Converters · SOP-16

CH9329 from WCH Jiangsu Qin Heng, in a SOP-16. 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 ACT# output USB configuration-complete status output, active low, indicating the chip has been successfully connected to the computer.
2 MODE0 input Work-mode configuration pin 0, used together with MODE1 and sampled at power-up, with an internal pull-up; if left floating the chip defaults to work mode 0.
3 MODE1 input Work-mode configuration pin 1, used together with MODE0 and sampled at power-up, with an internal pull-up.
4 CFG0 input Serial communication mode configuration pin 0, used together with CFG1 and sampled at power-up, with an internal pull-up; if left floating the chip defaults to serial mode 0.
5 CFG1 input Serial communication mode configuration pin 1, used together with CFG0 and sampled at power-up, with an internal pull-up.
6 RST input External reset input, active high, with an internal pull-down resistor.
7 TXD output Serial data output.
8 RXD input Serial data input with an internal pull-up resistor.
9 UP bidirectional USB packet upload indicator whose level toggles once for each successfully uploaded packet; when operating at 3.3 V a 4.7 kΩ pull-down resistor to GND must be fitted on this pin.
10 DEF input Factory-reset input: holding it low for more than 3 s restores all parameters to factory defaults; internal pull-up.
11 SET input Parameter configuration input, active low, with an internal pull-up; when low in any mode the chip switches to protocol transmission mode so the serial host can configure it.
12 UD+ bidirectional USB D+ data line connected directly to the USB bus; no series resistor may be added.
13 UD- bidirectional USB D- data line connected directly to the USB bus; no series resistor may be added.
14 GND power_in Common ground, connected directly to the USB bus ground.
15 VCC power_in Positive power supply input that requires an external 0.1 µF decoupling capacitor; absolute maximum rating is -0.4 V to 5.5 V.
16 V33 power_in Output of the internal USB power regulator and input to the internal USB power supply: at 3.3 V operation connect the external supply to VCC and tie V33 to VCC, while at 5 V operation decouple V33 with a 0.1 µF capacitor.

Key specifications

Parameter Value
Manufacturer WCH Jiangsu Qin Heng
Package SOP-16
Category Interface
Pins 16

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 -55 125 ℃ 7
Operating supply voltage (VCC/VCC5) VCC/VCC5 -0.4 5.5 V 7
Operating supply voltage (VDD33) VDD33 -0.4 4 V 7
I/O pin voltage (CH9329) VIO -0.4 V 7
USB signal pin voltage (CH9329) VUSB -0.4 V 7
Supply voltage VCC 3.7 5 5.5 V CH9329, TA = 25℃, VCC = 5V, excluding USB pins 8
Internal USB regulator output voltage V33 3.14 3.27 3.4 V CH9329, TA = 25℃, VCC = 5V, excluding USB pins 8
Static supply current ICC 8 11 mA CH9329, TA = 25℃, VCC = 5V, excluding USB pins 8
Low-level input voltage VIL -0.4 1.2 V CH9329, TA = 25℃, VCC = 5V, excluding USB pins 8
High-level input voltage VIH 2.4 V CH9329, TA = 25℃, VCC = 5V, excluding USB pins 8
Output low voltage VOL 0.4 V CH9329, TA = 25℃, VCC = 5V, excluding USB pins; single pin sinking 8 mA 8
Built-in pull-up input current IUP 35 70 140 uA CH9329, TA = 25℃, VCC = 5V, excluding USB pins 8
Built-in pull-down input current IDN -35 -70 -140 uA CH9329, TA = 25℃, VCC = 5V, excluding USB pins 8
Power-on reset voltage threshold VPOR 2.1 2.3 2.5 V CH9329, TA = 25℃, VCC = 5V, excluding USB pins 8
Supply voltage VCC 3 3.3 3.6 V CH9329, TA = 25℃, VCC = V33 = 3.3V, excluding USB pins 8
Static supply current ICC 3 5 mA CH9329, TA = 25℃, VCC = V33 = 3.3V, excluding USB pins 8
Low-level input voltage VIL -0.4 0.8 V CH9329, TA = 25℃, VCC = V33 = 3.3V, excluding USB pins 8
High-level input voltage VIH 1.9 V CH9329, TA = 25℃, VCC = V33 = 3.3V, excluding USB pins 8
Built-in pull-up input current IUP 15 30 60 uA CH9329, TA = 25℃, VCC = V33 = 3.3V, excluding USB pins 8
Built-in pull-down input current IDN -15 -30 -60 uA CH9329, TA = 25℃, VCC = V33 = 3.3V, excluding USB pins 8

CAD (KiCad official)

  • Symbol: CH9329
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SOP-16 (KiCad packages3D, STEP)
  • 3D model files: ch9329-etched.step / ch9329-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ch9329.step / ch9329.glb are the bare package body.

Provenance

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

  • Datasheet: WCH Jiangsu Qin Heng datasheet (11 pp, sha256 8622bc0e39b03416, retrieved 2026-10-17, 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 0.3, 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