74LVC257AD

@@ -0,0 +1,57 @@+# 74LVC257AD++**Nexperia** · Signal Switches / Encoders & Decoders / Multiplexers · SOIC-16++74LVC257AD 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 | S | input | Common data select input. LOW selects the nI0 inputs, HIGH selects the nI1 inputs, routed to the respective nY outputs. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 2 | 1I0 | input | Channel 1 data input from source 0. Routed to output 1Y when S is LOW and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 3 | 1I1 | input | Channel 1 data input from source 1. Routed to output 1Y when S is HIGH and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 4 | 1Y | tri_state | Channel 1 3-state multiplexer output. Drives either 1I0 or 1I1 according to S; high-impedance when /OE is HIGH. Rated for 50 Ω transmission-line drive at 85 °C. |+| 5 | 2I0 | input | Channel 2 data input from source 0. Routed to output 2Y when S is LOW and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 6 | 2I1 | input | Channel 2 data input from source 1. Routed to output 2Y when S is HIGH and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 7 | 2Y | tri_state | Channel 2 3-state multiplexer output. Drives either 2I0 or 2I1 according to S; high-impedance when /OE is HIGH. Rated for 50 Ω transmission-line drive at 85 °C. |+| 8 | GND | power_in | Ground reference (0 V). Connect to system ground. |+| 9 | 3Y | tri_state | Channel 3 3-state multiplexer output. Drives either 3I0 or 3I1 according to S; high-impedance when /OE is HIGH. Rated for 50 Ω transmission-line drive at 85 °C. |+| 10 | 3I1 | input | Channel 3 data input from source 1. Routed to output 3Y when S is HIGH and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 11 | 3I0 | input | Channel 3 data input from source 0. Routed to output 3Y when S is LOW and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 12 | 4Y | tri_state | Channel 4 3-state multiplexer output. Drives either 4I0 or 4I1 according to S; high-impedance when /OE is HIGH. Rated for 50 Ω transmission-line drive at 85 °C. |+| 13 | 4I1 | input | Channel 4 data input from source 1. Routed to output 4Y when S is HIGH and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 14 | 4I0 | input | Channel 4 data input from source 0. Routed to output 4Y when S is LOW and /OE is LOW. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 15 | /OE | input | 3-state output enable input, active LOW. When HIGH, all nY outputs are placed into the high-impedance state; when LOW, outputs follow the selected inputs. Schmitt-trigger CMOS input, 5.5 V tolerant. |+| 16 | VCC | power_in | Positive supply voltage. Recommended operating range 1.65 V to 3.6 V (functional down to 1.2 V); absolute maximum 6.5 V. Decouple locally to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Nexperia |+| Package | SOIC-16 |+| Category | Logic |+| Pins | 16 |++## Ordering variants++- `74LVC257ADD`+- `74LVC257ADPW`+- `74LVC257ADBQ`++## CAD (KiCad official)++- Symbol: `74LVC257AD`+- 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/74LVC257AD.pdf) (14 pp, sha256 `3a23e9adf4d0e855`, 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/74lvc257ad-datasheet.pdf)

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