CH443K

@@ -0,0 +1,45 @@+# CH443K++**WCH Jiangsu Qin Heng** · Analog Switches, Multiplexers · SC-70-6(SOT-363)++CH443K from WCH Jiangsu Qin Heng, in a SC-70-6(SOT-363). 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 | CH1 | passive | Analog switch throw #2 (S2B). Connected to COM when SEL = high. Recommended analog signal range 0 to 2.8 V (VANA), absolute limit -0.3 to VCC+0.3 V. Ron ≈ 5 Ω typ. |+| 2 | GND | power_in | Common ground, digital signal reference. |+| 3 | CH0 | passive | Analog switch throw #1 (S1B). Connected to COM when SEL = low. Recommended analog signal range 0 to 2.8 V (VANA), absolute limit -0.3 to VCC+0.3 V. Ron ≈ 5 Ω typ. |+| 4 | COM | passive | Common pole (DB) of the SPDT analog switch. Routed to CH0 when SEL=0 and to CH1 when SEL=1. Bidirectional analog path. |+| 5 | VCC | power_in | Positive supply. Rated 5 V (operating 4.0-5.5 V), abs max 6.5 V. Static ICC ≈ 0.1 µA typ with digital pins tied to rails. |+| 6 | SEL | input | Digital channel-select input. SEL=low selects CH0→COM; SEL=high selects CH1→COM. VIL max 1.0 V, VIH min 2.0 V (referenced to VCC). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | WCH Jiangsu Qin Heng |+| Package | SC-70-6(SOT-363) |+| Category | Interface |+| Pins | 6 |++## Ordering variants++- `CH443K`++## CAD (KiCad official)++- Symbol: `CH443K`+- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`+- 3D model: SC-70-6(SOT-363) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [WCH Jiangsu Qin Heng datasheet](docs/ch443k-datasheet.pdf) (16 pp, sha256 `608400255c2b0865`, retrieved 2026-08-17, tier: lcsc)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ch443k-datasheet.pdf)

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