component
SN74HC251DR
Public Made by Adomby adom
Texas Instruments Signal Switches / Encoders & Decoders / Multiplexers, SOIC-16. Pinout extracted from 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
markdownSN74HC251DR
Texas Instruments · Signal Switches / Encoders & Decoders / Multiplexers · SOIC-16
SN74HC251DR from Texas Instruments, 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 | D3 | input | Data input 3. Selected when C=L, B=H, A=H. Passed to Y (true) and W (inverted) when OE is low. |
| 2 | D2 | input | Data input 2. Selected when C=L, B=H, A=L. |
| 3 | D1 | input | Data input 1. Selected when C=L, B=L, A=H. |
| 4 | D0 | input | Data input 0. Selected when C=L, B=L, A=L. |
| 5 | Y | tri_state | True (non-inverted) 3-state data output. Drives the selected D-input level when OE is low; high-impedance when OE is high. Capable of driving up to 15 LSTTL loads at ±6 mA at 5 V. |
| 6 | W | tri_state | Inverted (complementary) 3-state data output. Drives the inverse of the selected D-input when OE is low; high-impedance when OE is high. |
| 7 | OE | input | Active-low output enable (strobe). When OE is low, the selected data appears on Y and W. When OE is high, both Y and W are placed in the high-impedance (3-state) condition. |
| 8 | GND | power_in | Ground (0 V) reference for the device. |
| 9 | C | input | Select input C (MSB of the 3-bit binary select). Together with B and A, chooses 1-of-8 data inputs D0-D7. |
| 10 | B | input | Select input B (middle bit of the 3-bit binary select). |
| 11 | A | input | Select input A (LSB of the 3-bit binary select). |
| 12 | D7 | input | Data input 7. Selected when C=H, B=H, A=H. |
| 13 | D6 | input | Data input 6. Selected when C=H, B=H, A=L. |
| 14 | D5 | input | Data input 5. Selected when C=H, B=L, A=H. |
| 15 | D4 | input | Data input 4. Selected when C=H, B=L, A=L. |
| 16 | VCC | power_in | Positive supply voltage, 2 V to 6 V (recommended). Absolute maximum 7 V. Bypass with a 0.1-µF capacitor placed close to the pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Logic |
| Pins | 16 |
Ordering variants
Same part, different packaging or reel option.
SN74HC251DRDSN74HC251DRSN74HC251DRDBSN74HC251DRDBRSN74HC251DRNSN74HC251DRNSSN74HC251DRNSRSN74HC251DRPWSN74HC251DRPWRSN74HC251DRJSN74HC251DRFK
CAD (KiCad official)
- Symbol:
SN74HC251DR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
sn74hc251dr-etched.step/sn74hc251dr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74hc251dr.step/sn74hc251dr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (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).