SN74HC251PW

@@ -0,0 +1,71 @@+# SN74HC251PW++**Texas Instruments** · Signal Switches, Multiplexers, Decoders · TSSOP-16++SN74HC251PW 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 D3. Routed to the Y/W outputs when the select code (C,B,A) = (0,1,1) and /OE is low. CMOS logic input, VIH/VIL per VCC (e.g. 3.15 V/1.35 V at VCC = 4.5 V), input current ±1 μA max. |+| 2 | D2 | input | Data input D2. Selected to the outputs when (C,B,A) = (0,1,0) and /OE is low. Standard HC-family CMOS input. |+| 3 | D1 | input | Data input D1. Selected to the outputs when (C,B,A) = (0,0,1) and /OE is low. Standard HC-family CMOS input. |+| 4 | D0 | input | Data input D0. Selected to the outputs when (C,B,A) = (0,0,0) and /OE is low. Standard HC-family CMOS input. |+| 5 | Y | tri_state | True (non-inverted) 3-state data output. Drives the selected Dn value; goes to high-impedance (Z) when /OE is high. ±6 mA drive at VCC = 5 V; interfaces directly with system bus or drives up to 15 LSTTL loads. |+| 6 | W | tri_state | Complementary (inverted) 3-state data output. Drives the logical inverse of the selected Dn; goes to high-impedance (Z) when /OE is high. ±6 mA drive at VCC = 5 V. |+| 7 | /OE | input | Active-low output enable (strobe). When high, both Y and W outputs are placed in the high-impedance (3-state) state regardless of select or data inputs; when low, the selected Dn drives Y (true) and W (inverted). Standard CMOS input, ±1 μA max input current. |+| 8 | GND | power_in | Device ground reference (0 V). All input/output voltages are referenced to this pin. Tie to system ground with a low-impedance return; place bypass capacitor between VCC (pin 16) and GND close to the device. |+| 9 | A | input | Select input A (LSB of the 3-bit binary select code A/B/C that chooses one of D0-D7). Standard HC-family CMOS input; all unused inputs must be tied to VCC or GND. |+| 10 | B | input | Select input B (middle bit of the 3-bit select code). CMOS logic input. |+| 11 | C | input | Select input C (MSB of the 3-bit select code). CMOS logic input. |+| 12 | D7 | input | Data input D7. Selected to the outputs when (C,B,A) = (1,1,1) and /OE is low. Standard HC-family CMOS input. |+| 13 | D6 | input | Data input D6. Selected to the outputs when (C,B,A) = (1,1,0) and /OE is low. Standard HC-family CMOS input. |+| 14 | D5 | input | Data input D5. Selected to the outputs when (C,B,A) = (1,0,1) and /OE is low. Standard HC-family CMOS input. |+| 15 | D4 | input | Data input D4. Selected to the outputs when (C,B,A) = (1,0,0) and /OE is low. Standard HC-family CMOS input. |+| 16 | VCC | power_in | Positive supply voltage, 2 V to 6 V (nominal 5 V). Quiescent ICC of 80 μA max at VCC = 6 V. Bypass with a 0.1 μF ceramic capacitor to GND close to the device (parallel with 1 μF is common). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TSSOP-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++Same part, different packaging or reel option.++- `SN74HC251PW`+- `SN74HC251PWR`+- `SN74HC251PWR1G4`+- `SN74HC251PWT`+- `SN74HC251PWD`+- `SN74HC251PWDR`+- `SN74HC251PWDRG4`+- `SN74HC251PWDT`+- `SN74HC251PWDB`+- `SN74HC251PWDBR`+- `SN74HC251PWN`+- `SN74HC251PWNS`+- `SN74HC251PWNSR`+- `SN74HC251PWJ`+- `SN74HC251PWFK`++## CAD (KiCad official)++- Symbol: `SN74HC251PW`+- 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) (None 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/sn74hc251pw-datasheet.pdf)

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