component
74HC257D
Public Unreviewedby Ray
Nexperia Signal Switches / Encoders & Decoders / Multiplexers, SOIC-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdown74HC257D
Nexperia · Signal Switches / Encoders & Decoders / Multiplexers · SOIC-16
74HC257D 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. Selects between the nI0 inputs (S=LOW) and nI1 inputs (S=HIGH) routed to the nY outputs. |
| 2 | 1I0 | input | Data input from source 0 for multiplexer channel 1. Routed to 1Y when S=LOW and OE=LOW. |
| 3 | 1I1 | input | Data input from source 1 for multiplexer channel 1. Routed to 1Y when S=HIGH and OE=LOW. |
| 4 | 1Y | tri_state | 3-state multiplexer output for channel 1. High-impedance when OE=HIGH. |
| 5 | 2I0 | input | Data input from source 0 for multiplexer channel 2. Routed to 2Y when S=LOW and OE=LOW. |
| 6 | 2I1 | input | Data input from source 1 for multiplexer channel 2. Routed to 2Y when S=HIGH and OE=LOW. |
| 7 | 2Y | tri_state | 3-state multiplexer output for channel 2. High-impedance when OE=HIGH. |
| 8 | GND | power_in | Ground (0 V) reference. |
| 9 | 3Y | tri_state | 3-state multiplexer output for channel 3. High-impedance when OE=HIGH. |
| 10 | 3I1 | input | Data input from source 1 for multiplexer channel 3. Routed to 3Y when S=HIGH and OE=LOW. |
| 11 | 3I0 | input | Data input from source 0 for multiplexer channel 3. Routed to 3Y when S=LOW and OE=LOW. |
| 12 | 4Y | tri_state | 3-state multiplexer output for channel 4. High-impedance when OE=HIGH. |
| 13 | 4I1 | input | Data input from source 1 for multiplexer channel 4. Routed to 4Y when S=HIGH and OE=LOW. |
| 14 | 4I0 | input | Data input from source 0 for multiplexer channel 4. Routed to 4Y when S=LOW and OE=LOW. |
| 15 | OE | input | 3-state output enable input, active LOW. When OE=HIGH, all nY outputs are in the high-impedance OFF-state. |
| 16 | VCC | power_in | Supply voltage. 2.0 V to 6.0 V for 74HC257; 4.5 V to 5.5 V for 74HCT257. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |
Ordering variants
Same part, different packaging or reel option.
74HC257DD74HC257DPW
CAD (KiCad official)
- Symbol:
74HC257D - 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 (15 pp, sha256
9a5ab16a50053e88, 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).