Mechanical Dimensions & Land Pattern (QFN-10(1.4x1.8))
Extracted from Datasheet & IPC-7351B NormalizedRecommended Companion BOM & Drop-In Equivalents
Passive external components per reference schematic and 1:1 pin-compatible alternatives| Designator / Replacement MPN | Value / Package | Function & PCB Layout Rule |
|---|---|---|
| N/A BOM | Per application circuit QFN-10(1.4x1.8) | Size power & signal trace widths for rated load current following IPC-2221 clearance rules. |
Technical Frequently Asked Questions (FAQ) — CH9442Q (QFN-10(1.4x1.8))
Quick answers covering Pinout, IPC-7351B Land Pattern dimensions, and CAD export formatsWhat is the Pinout and operating voltage specification of CH9442Q (QFN-10(1.4x1.8))?
Manufactured by WCH, the CH9442Q is housed in a QFN-10(1.4x1.8) package with 10 pins and a 0.40 mm lead pitch. Key pins include: 1 (XA XB 、: Multiplexed I/O & Peripheral Pin XA XB 、 (General)), 2 (XA XB 、: Multiplexed I/O & Peripheral Pin XA XB 、 (General)), 3 (GND: Ground Reference Pin (GND)), 4 (S0A S0B 、: Multiplexed I/O & Peripheral Pin S0A S0B 、 (General)), 5 (S0A S0B 、: Multiplexed I/O & Peripheral Pin S0A S0B 、 (General)), 6 (S1A S1B 、: Multiplexed I/O & Peripheral Pin S1A S1B 、 (General)).
What are the IPC-7351B PCB Footprint dimensions for CH9442Q?
Normalized from the official datasheet mechanical drawing per IPC-7351B (Density Level B Nominal), CH9442Q (QFN-10(1.4x1.8)) has a nominal body envelope of 1.40 × 1.80 mm, pitch e = 0.40 mm, and 10 copper pads.
Where can I download KiCad (.kicad_mod, .kicad_sym), Fusion 360 (.lbr), and 3D STEP models for CH9442Q?
You can download the verified open-hardware (CERN-OHL-P-2.0) CAD library bundle for CH9442Q (WCH, QFN-10(1.4x1.8)) directly on this page, including KiCad 8 Footprints (.kicad_mod), Schematic Symbols (.kicad_sym), Autodesk Fusion 360 / Eagle (.lbr), and 3D STEP AP214 / WebGL GLB models.
Static Reference Appendix: Pinout Table (10 pins) & CH9442 Family VariantsExpand static table
| Pin # | Signal Name | Electrical Type | Functional Description & Design Notes |
|---|---|---|---|
| 1 | XA XB 、 | Digital_IO | Signal terminal XA XB 、 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: XA XB 、. Supported peripheral buses: General. |
| 2 | XA XB 、 | Digital_IO | Signal terminal XA XB 、 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: XA XB 、. Supported peripheral buses: General. |
| 3 | GND | GND | 0V electrical ground return terminal (GND) for internal core logic, I/O drivers, and analog sub-blocks. |
| 4 | S0A S0B 、 | Digital_IO | Signal terminal S0A S0B 、 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: S0A S0B 、. Supported peripheral buses: General. |
| 5 | S0A S0B 、 | Digital_IO | Signal terminal S0A S0B 、 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: S0A S0B 、. Supported peripheral buses: General. |
| 6 | S1A S1B 、 | Digital_IO | Signal terminal S1A S1B 、 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: S1A S1B 、. Supported peripheral buses: General. |
| 7 | S1A S1B 、 | Digital_IO | Signal terminal S1A S1B 、 (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: S1A S1B 、. Supported peripheral buses: General. |
| 8 | EN# | Digital_IO | Signal terminal EN# (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: EN#. Supported peripheral buses: General. |
| 9 | VCC | Power_In | Primary positive power supply input (VCC) operating in the 3.3V / 5.0V Standard Logic domain (Max rating: 5.5V). |
| 10 | SEL | Digital_IO | Signal terminal SEL (I/O, 3.3V / 5.0V Standard Logic domain). Multiplexed alternate functions: SEL. Supported peripheral buses: General. |