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SN74LS251DR
Public Made by Adomby adom
Texas Instruments Signal Switches, Multiplexers, Decoders, SOP-16. Pinout cross-checked by two models against the datasheet, 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
markdownSN74LS251DR
Texas Instruments · Signal Switches, Multiplexers, Decoders · SOP-16
SN74LS251DR from Texas Instruments, in a SOP-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | D3 | input | Data input 3, one of eight data inputs selected by the A, B, C select lines. |
| 2 | D2 | input | Data input 2, one of eight data inputs selected by the A, B, C select lines. |
| 3 | D1 | input | Data input 1, one of eight data inputs selected by the A, B, C select lines. |
| 4 | D0 | input | Data input 0, one of eight data inputs selected by the A, B, C select lines. |
| 5 | Y | tri_state | True (non-inverted) three-state data output; goes to high-impedance when enable G-bar is high. |
| 6 | W | output | Complementary (inverted) data output providing the inverse of the selected data input; standard totem-pole output (not three-state). |
| 7 | G | input | Active-low enable (strobe) input; must be low to enable the device, high forces both Y and W outputs (Y to high impedance). |
| 8 | GND | power_in | Ground reference supply pin. |
| 9 | C | input | Data select binary input C, most significant bit of the 3-bit select code choosing one of eight data inputs. |
| 10 | B | input | Data select binary input B, middle bit of the 3-bit select code choosing one of eight data inputs. |
| 11 | A | input | Data select binary input A, least significant bit of the 3-bit select code choosing one of eight data inputs. |
| 12 | D7 | input | Data input 7, one of eight data inputs selected by the A, B, C select lines. |
| 13 | D6 | input | Data input 6, one of eight data inputs selected by the A, B, C select lines. |
| 14 | D5 | input | Data input 5, one of eight data inputs selected by the A, B, C select lines. |
| 15 | D4 | input | Data input 4, one of eight data inputs selected by the A, B, C select lines. |
| 16 | VCC | power_in | Positive supply voltage pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOP-16 |
| Category | Logic |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
SN74LS251DR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOP-16 (KiCad packages3D, STEP)
- 3D model files:
sn74ls251dr-etched.step/sn74ls251dr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74ls251dr.step/sn74ls251dr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (23 pp, sha256
01fb4220525fae7b, retrieved 2026-09-24, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-sonnet-5(vision), consensusclaude-opus-4-8(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).