RS2251XTQC16

@@ -0,0 +1,61 @@+# RS2251XTQC16++**Jiangsu RUNIC Tech** · Analog Switches / Multiplexers · QFN-16L(3x3)++RS2251XTQC16 from Jiangsu RUNIC Tech, in a QFN-16L(3x3). 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 | X | passive | Analog Switch 'X' common output/input. Bidirectional analog signal pin connected to one of X0-X7 based on A/B/C address inputs when ENABLE is low. Signal range GND to VCC. |+| 2 | X7 | passive | Analog switch channel input/output 7. Connected to X when C,B,A = 1,1,1 and ENABLE is low. Bidirectional analog signal, range GND to VCC. |+| 3 | X5 | passive | Analog switch channel input/output 5. Connected to X when C,B,A = 1,0,1 and ENABLE is low. Bidirectional analog signal, range GND to VCC. |+| 4 | ENABLE | input | Active-low digital enable input. When low, one of X0-X7 is connected to X per address inputs; when high, all channels are off. VIH ≥ 1.7V, VIL ≤ 0.5V. Normally connected to GND if permanently enabled. |+| 5 | NC | unconnected | No connect. Leave floating or tie as convenient. |+| 6 | GND | power_in | Ground. Connect to digital ground / system 0V reference. |+| 7 | C | input | Digital Address 'C' input (MSB of channel select). Binary address bit selecting X0-X7. VIH ≥ 1.7V, VIL ≤ 0.5V. Must be held at VCC or GND when unused. |+| 8 | B | input | Digital Address 'B' input (middle bit of channel select). Binary address bit selecting X0-X7. VIH ≥ 1.7V, VIL ≤ 0.5V. |+| 9 | A | input | Digital Address 'A' input (LSB of channel select). Binary address bit selecting X0-X7. VIH ≥ 1.7V, VIL ≤ 0.5V. |+| 10 | X3 | passive | Analog switch channel input/output 3. Connected to X when C,B,A = 0,1,1 and ENABLE is low. Bidirectional analog signal, range GND to VCC. |+| 11 | X0 | passive | Analog switch channel input/output 0. Connected to X when C,B,A = 0,0,0 and ENABLE is low. Bidirectional analog signal, range GND to VCC. |+| 12 | X1 | passive | Analog switch channel input/output 1. Connected to X when C,B,A = 0,0,1 and ENABLE is low. Bidirectional analog signal, range GND to VCC. |+| 13 | X2 | passive | Analog switch channel input/output 2. Connected to X when C,B,A = 0,1,0 and ENABLE is low. Bidirectional analog signal, range GND to VCC. |+| 14 | VCC | power_in | Positive analog and digital supply voltage input. 2.5V to 5.5V operating range. Decouple locally with a bypass capacitor to GND. |+| 15 | X4 | passive | Analog switch channel input/output 4. Connected to X when C,B,A = 1,0,0 and ENABLE is low. Bidirectional analog signal, range GND to VCC. |+| 16 | X6 | passive | Analog switch channel input/output 6. Connected to X when C,B,A = 1,1,0 and ENABLE is low. Bidirectional analog signal, range GND to VCC. |+| EP | EP | power_in | Exposed thermal pad on package underside. Must be connected to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Jiangsu RUNIC Tech |+| Package | QFN-16L(3x3) |+| Category | Comm/UART |+| Pins | 17 |++## Ordering variants++Same part, different packaging or reel option.++- `RS2251XTQC16`+- `RS2251XTQC16XS16`+- `RS2251XTQC16XSS16`+- `RS2251XTQC16XTSS16`++## CAD (KiCad official)++- Symbol: `RS2251XTQC16`+- Footprint: `Package_DFN_QFN:MPS_QFN-16_3x3mm_P0.5mm`+- 3D model: QFN-16L(3x3) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Jiangsu RUNIC Tech datasheet](docs/rs2251xtqc16-datasheet.pdf) (14 pp, sha256 `64ffabd09559d39d`, 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/rs2251xtqc16-datasheet.pdf)

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