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ch9329-etched.step	ch9329: factory component page (tier=lcsc) · Ray	17d ago
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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