SN74HC151 8-to-1 Multiplexer

@@ -0,0 +1,62 @@+# SN74HC151++**Texas Instruments** · Multiplexer · SOIC-16++The SN74HC151 is an 8-to-1 data selector/multiplexer. Three select lines route one of eight data inputs to the output, and it provides both true (Y) and complementary (W) outputs plus an active-low enable. It is used for parallel-to-serial conversion and input selection.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | D3 | input | Data input 3. Routed to output Y (and inverted to W) when the select code CBA = 011 and strobe G is low. |+| 2 | D2 | input | Data input 2. Routed to output Y (and inverted to W) when the select code CBA = 010 and strobe G is low. |+| 3 | D1 | input | Data input 1. Routed to output Y (and inverted to W) when the select code CBA = 001 and strobe G is low. |+| 4 | D0 | input | Data input 0. Routed to output Y (and inverted to W) when the select code CBA = 000 and strobe G is low. |+| 5 | Y | output | True (non-inverted) data output. Presents the level of the selected D input when strobe G is low; forced low when G is high. Push-pull CMOS output rated ±6 mA at 5 V. |+| 6 | W | output | Inverted data output. Presents the complement of the selected D input when strobe G is low; forced high when G is high. Push-pull CMOS output rated ±6 mA at 5 V. |+| 7 | ~{G} | input | Active-low strobe (output enable). When low, the multiplexer output tracks the selected D input; when high, Y is forced low and W is forced high, disabling data selection. |+| 8 | GND | power_in | Ground reference (0 V). Connect to system ground. |+| 9 | C | input | Select input C (MSB of the 3-bit channel address). Together with B and A chooses which of the eight D inputs is routed to the outputs. |+| 10 | B | input | Select input B (middle bit of the 3-bit channel address). Together with C and A chooses which of the eight D inputs is routed to the outputs. |+| 11 | A | input | Select input A (LSB of the 3-bit channel address). Together with C and B chooses which of the eight D inputs is routed to the outputs. |+| 12 | D7 | input | Data input 7. Routed to output Y (and inverted to W) when the select code CBA = 111 and strobe G is low. |+| 13 | D6 | input | Data input 6. Routed to output Y (and inverted to W) when the select code CBA = 110 and strobe G is low. |+| 14 | D5 | input | Data input 5. Routed to output Y (and inverted to W) when the select code CBA = 101 and strobe G is low. |+| 15 | D4 | input | Data input 4. Routed to output Y (and inverted to W) when the select code CBA = 100 and strobe G is low. |+| 16 | VCC | power_in | Positive supply voltage. Recommended operating range 2 V to 6 V (5 V nominal). Bypass with a 0.1-µF ceramic capacitor close to the pin. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 8-to-1 multiplexer / data selector |+| Logic family | 74HC (CMOS) |+| Outputs | True (Y) and complement (W) |+| Supply voltage | 2 V to 6 V |+| Propagation delay | 17 ns typ at 5 V |+| Operating temperature | -40 C to 85 C |++## Ordering variants++- `SN74HC151D`+- `SN74HC151N`+- `SN74HC151NS`+- `SN74HC151PW`+- `SN74HC151J`+- `SN74HC151FK`++## CAD (KiCad official)++- Symbol: `sn74hc151.kicad_sym`+- Footprint: `sn74hc151.kicad_mod`+- 3D model: SOIC-16 body from KiCad `Package_SO/SOIC-16_3.9x9.9mm_P1.27mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn74hc151.pdf) (28 pp, sha256 `52a419ef9dca8855`, 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/sn74hc151-datasheet.pdf)

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