| PartNumber | SN74LS251DR | SN74LS251N | SN74LS251D |
| Description | Encoders, Decoders, Multiplexers & Demultiplexers 8 To 1 Data Slctr/ Mltplxr W/3-St Otpt | Encoders, Decoders, Multiplexers & Demultiplexers 8 to 1 | Encoders, Decoders, Multiplexers & Demultiplexers 8 To 1 Data Slctr/ Mltplxr W/3-St Otpt |
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Category | Encoders, Decoders, Multiplexers & Demultiplexers | Encoders, Decoders, Multiplexers & Demultiplexers | Encoders, Decoders, Multiplexers & Demultiplexers |
| RoHS | Y | Y | Y |
| Product | Selectors / Multiplexers | Selectors / Multiplexers | Selectors / Multiplexers |
| Logic Family | LS | LS | LS |
| Number of Input Lines | 8 Input | 8 Input | 8 Input |
| Number of Output Lines | 1 Output | 1 Output | 1 Output |
| Propagation Delay Time | 45 ns | 45 ns | 45 ns |
| Supply Voltage Min | 4.75 V | 4.75 V | 4.75 V |
| Supply Voltage Max | 5.25 V | 5.25 V | 5.25 V |
| Minimum Operating Temperature | 0 C | 0 C | 0 C |
| Maximum Operating Temperature | + 70 C | + 70 C | + 70 C |
| Mounting Style | SMD/SMT | Through Hole | SMD/SMT |
| Package / Case | SOP-16 | PDIP-16 | SOP-16 |
| Packaging | Reel | Tube | Tube |
| Function | Multiplexer | 8 to 1 | Multiplexer |
| Height | 1.58 mm | 4.57 mm | 1.58 mm |
| Length | 9.9 mm | 19.3 mm | 9.9 mm |
| Number of Circuits | Quad | Quad | Quad |
| Operating Temperature Range | 0 C to + 70 C | 0 C to + 70 C | 0 C to + 70 C |
| Series | SN74LS251 | SN74LS251 | SN74LS251 |
| Technology | Bipolar | Bipolar | Bipolar |
| Width | 3.91 mm | 6.35 mm | 3.91 mm |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Logic Type | Data Selectors/Multiplexers | Data Selectors/Multiplexers | Data Selectors/Multiplexers |
| High Level Output Current | - 2.6 mA | - 2.6 mA | - 2.6 mA |
| Low Level Output Current | 8 mA | 8 mA | 8 mA |
| Maximum Clock Frequency | 35 MHz | 35 MHz | 35 MHz |
| Operating Supply Voltage | 5 V | 5 V | 5 V |
| Product Type | Encoders, Decoders, Multiplexers & Demultiplexers | Encoders, Decoders, Multiplexers & Demultiplexers | Encoders, Decoders, Multiplexers & Demultiplexers |
| Factory Pack Quantity | 2500 | 25 | 40 |
| Subcategory | Logic ICs | Logic ICs | Logic ICs |
| Unit Weight | 0.004998 oz | 0.033570 oz | 0.004998 oz |
| Input Voltage | - | 2.0 V to 0.8 V | - |
| Output Current | - | - 800 mA | - |
| Output Voltage | - | 4.75 V to 5.25 V | - |