74HC4051D

@@ -0,0 +1,58 @@+# 74HC4051D++**Nexperia** · Analog Switches, Multiplexers · SOIC-16++74HC4051D from Nexperia, in a SOIC-16. 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 | Y4 | bidirectional | Independent input/output channel 4. When selected via S2:S0 = 100 and E is LOW, this pin is connected to the common Z pin through the analog switch (typ. 60-80 Ω ON). |+| 2 | Y6 | bidirectional | Independent input/output channel 6. When selected via S2:S0 = 110 and E is LOW, this pin is connected to Z through the analog switch. |+| 3 | Z | bidirectional | Common analog input/output. Connected to one of Y0-Y7 as selected by S0/S1/S2 when the enable input E is LOW. Analog signal range VEE to VCC. |+| 4 | Y7 | bidirectional | Independent input/output channel 7. When selected via S2:S0 = 111 and E is LOW, this pin is connected to Z through the analog switch. |+| 5 | Y5 | bidirectional | Independent input/output channel 5. When selected via S2:S0 = 101 and E is LOW, this pin is connected to Z through the analog switch. |+| 6 | E | input | Active-LOW enable input. When E is LOW the selected Yn-to-Z switch is ON; when E is HIGH all switches are OFF (device disabled). Digital input, VEE to VCC. |+| 7 | VEE | power_in | Negative analog supply voltage. Sets the lower rail for the analog switch pass range. VCC - VEE up to 10 V; VEE typically GND for single-supply operation, or negative for bipolar analog signals (e.g. -5 V for ±5 V analog range). |+| 8 | GND | power_in | Ground supply voltage (0 V reference). Reference for the digital control inputs (S0, S1, S2, E). |+| 9 | S2 | input | Digital channel-select input, bit 2 (MSB). Combined with S1/S0 selects which of Y0-Y7 is connected to Z. Digital levels referenced to GND/VCC. |+| 10 | S1 | input | Digital channel-select input, bit 1. Combined with S2/S0 selects which of Y0-Y7 is connected to Z. |+| 11 | S0 | input | Digital channel-select input, bit 0 (LSB). Combined with S2/S1 selects which of Y0-Y7 is connected to Z. |+| 12 | Y3 | bidirectional | Independent input/output channel 3. When selected via S2:S0 = 011 and E is LOW, this pin is connected to Z through the analog switch. |+| 13 | Y0 | bidirectional | Independent input/output channel 0. When selected via S2:S0 = 000 and E is LOW, this pin is connected to Z through the analog switch. |+| 14 | Y1 | bidirectional | Independent input/output channel 1. When selected via S2:S0 = 001 and E is LOW, this pin is connected to Z through the analog switch. |+| 15 | Y2 | bidirectional | Independent input/output channel 2. When selected via S2:S0 = 010 and E is LOW, this pin is connected to Z through the analog switch. |+| 16 | VCC | power_in | Positive supply voltage. 74HC4051: 2.0-10.0 V (referenced to GND); 74HCT4051: 4.5-5.5 V. VCC - VEE up to 10 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Nexperia |+| Package | SOIC-16 |+| Category | Interface |+| Pins | 16 |++## Ordering variants++- `74HC4051DD`+- `74HC4051DPW`+- `74HC4051DBQ`+- `74HC4051DBZ`++## CAD (KiCad official)++- Symbol: `74HC4051D`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/74HC4051D.pdf) (28 pp, sha256 `e5b40e804e4dea04`, retrieved 2026-08-17, tier: manufacturer)+- **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/74hc4051d-datasheet.pdf)

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