component
CH9328
Public Made by Adomby adom
WCH(Jiangsu Qin Heng) USB ICs, 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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Contents
README
markdownCH9328
WCH(Jiangsu Qin Heng) · USB ICs · SOP-16
CH9328 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 | RSTI | input | External reset input, active low, with built-in pull-up resistor. |
| 2 | TXD | output | Invalid pin, not actually used. |
| 3 | RXD | input | Serial data input with built-in pull-up resistor. |
| 4 | T_LED | output | Serial UART send status output, active high. |
| 5 | V3 | power_in | Connect to VCC when VCC is 3V3, connect to a 0.1uF decoupling capacitor when VCC is 5V. |
| 6 | UD+ | bidirectional | Connect directly to USB D+ signal. |
| 7 | UD- | bidirectional | Connect directly to USB D- signal. |
| 8 | GND | power_in | Ground. |
| 9 | XI | input | Crystal oscillator input requiring external crystal and capacitor for chips below V1.4; left suspended for V1.4 and above with integrated oscillator. |
| 10 | XO | output | Crystal oscillator inverted output requiring external crystal and capacitor for chips below V1.4; left suspended for V1.4 and above with integrated oscillator. |
| 11 | IO2 | bidirectional | User-configurable pin and operating mode configuration pin, level detected after power-on, configurable as GPIO after USB configuration. |
| 12 | IO1 | bidirectional | User-configurable pin and speed configuration pin; high at power-on gives normal speed mode, otherwise high speed mode (about twice normal speed); configurable as GPIO after USB configuration. |
| 13 | IO4 | bidirectional | User-configurable pin and operating mode configuration pin, level detected after power-on, configurable as GPIO after USB configuration. |
| 14 | IO3 | bidirectional | User-configurable pin and operating mode configuration pin, level detected after power-on, configurable as GPIO after USB configuration. |
| 15 | VCC | power_in | Power supply voltage input (3.0V to 5.3V), requires an external 0.1uF decoupling capacitor. |
| 16 | ACT# | output | USB configuration completed status output, active low. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | WCH(Jiangsu Qin Heng) |
| Package | SOP-16 |
| Category | Interface ICs |
| 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 | ℃ | 4 | ||
| Storage ambient temperature | TS | -55 | 100 | ℃ | 4 | ||
| Supply voltage | VCC | -0.5 | 5.5 | V | VCC connects to power, GND to ground | 4 | |
| Voltage of input or output pin | VIO | -0.5 | 5.5 | V | Max printed as VCC+0.5 | 4 | |
| Supply voltage | VCC | 3 | 5 | 5.3 | V | TA=25℃, VCC=5V, exclude pins connected to USB bus | 4 |
| Static supply current | ICC | 15 | 30 | mA | TA=25℃, VCC=5V, exclude pins connected to USB bus | 4 | |
| Input low voltage | VIL | -0.5 | 0.8 | V | TA=25℃, VCC=5V, exclude pins connected to USB bus | 5 | |
| Output low voltage | VOL | 0.5 | V | 8mA draw current | 5 | ||
| Input current of RXD with built-in pull-up resistor | IUPrxd | 40 | 80 | 160 | uA | 5 | |
| Input current of RSTI with built-in pull-down resistor | IDNrst | -10 | -150 | -240 | uA | 5 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper | When designing the PCB, pay attention to: decoupling capacitor C2 and C3 get as close to connected pins of CH9328; making sure D+ and D- signal lines are close to the parallel wiring and providing gro | 5 |
CAD (KiCad official)
- Symbol:
CH9328 - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOP-16 (KiCad packages3D, STEP)
- 3D model files:
ch9328-etched.step/ch9328-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ch9328.step/ch9328.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: WCH(Jiangsu Qin Heng) datasheet (6 pp, sha256
afe1d515c815d37e, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-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).