SN74HC251PWR

@@ -0,0 +1,61 @@+# SN74HC251PWR++**Texas Instruments** · Signal Switches / Encoders & Decoders / Multiplexers · TSSOP-16++SN74HC251PWR from Texas Instruments, in a TSSOP-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 | D3 | input | Data input 3. One of eight multiplexer data inputs; routed to outputs Y/W when select code CBA=011 and OE is low. |+| 2 | D2 | input | Data input 2. One of eight multiplexer data inputs; selected when CBA=010. |+| 3 | D1 | input | Data input 1. One of eight multiplexer data inputs; selected when CBA=001. |+| 4 | D0 | input | Data input 0. One of eight multiplexer data inputs; selected when CBA=000. |+| 5 | Y | tri_state | True (non-inverted) 3-state data output. Drives the selected Dn value; high-impedance when OE is high. Rated ±6 mA at Vcc=5 V. |+| 6 | W | tri_state | Inverted (complementary) 3-state data output. Drives the logical inverse of the selected Dn value; high-impedance when OE is high. Rated ±6 mA at Vcc=5 V. |+| 7 | OE | input | Active-low output enable. When low, Y and W are driven by the selected Dn input; when high, both outputs are placed in high-impedance (3-state). |+| 8 | GND | power_in | Ground reference (0 V). |+| 9 | C | input | Select input C (MSB of the 3-bit binary channel select). Together with B and A chooses which Dn drives the outputs. |+| 10 | B | input | Select input B (middle bit of the 3-bit binary channel select). |+| 11 | A | input | Select input A (LSB of the 3-bit binary channel select). |+| 12 | D7 | input | Data input 7. Selected when CBA=111. |+| 13 | D6 | input | Data input 6. Selected when CBA=110. |+| 14 | D5 | input | Data input 5. Selected when CBA=101. |+| 15 | D4 | input | Data input 4. Selected when CBA=100. |+| 16 | VCC | power_in | Positive supply voltage. Recommended operating range 2 V to 6 V; absolute maximum 7 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++- `SN74HC251PWR`+- `SN74HC251PWRD`+- `SN74HC251PWRDB`+- `SN74HC251PWRN`+- `SN74HC251PWRNS`+- `SN74HC251PWRJ`+- `SN74HC251PWRFK`++## CAD (KiCad official)++- Symbol: `SN74HC251PWR`+- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`+- 3D model: TSSOP-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn74hc251.pdf) (31 pp, sha256 `407441728ca2e20f`, 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/sn74hc251pwr-datasheet.pdf)

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