| Parameters | 
                                                                                                            
                                            | Mounting Type | Through Hole | 
                                                                            
                                            | Package / Case | 16-DIP (0.300, 7.62mm) | 
                                                                            
                                            | Surface Mount | NO | 
                                                                            
                                            | Operating Temperature | 0°C~70°C | 
                                                                            
                                            | Packaging | Tube | 
                                                                            
                                            | Published | 2017 | 
                                                                            
                                            | Series | 74LS | 
                                                                            
                                            | JESD-609 Code | e0 | 
                                                                            
                                            | Pbfree Code | no | 
                                                                            
                                            | Part Status | Obsolete | 
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 3  (168 Hours) | 
                                                                            
                                            | Number of Terminations | 16 | 
                                                                            
                                            | Type | Multiplexer | 
                                                                            
                                            | Terminal Finish | TIN LEAD | 
                                                                            
                                            | Technology | TTL | 
                                                                            
                                            | Voltage - Supply | 4.75V~5.25V | 
                                                                            
                                            | Terminal Position | DUAL | 
                                                                            
                                            | Peak Reflow Temperature (Cel) | NOT SPECIFIED | 
                                                                            
                                            | Number of Functions | 1 | 
                                                                            
                                            | Supply Voltage | 5V | 
                                                                            
                                            | Terminal Pitch | 2.54mm | 
                                                                            
                                            | Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED | 
                                                                            
                                            | Qualification Status | Not Qualified | 
                                                                            
                                            | Circuit | 1 x 8:1 | 
                                                                            
                                            | Power Supplies | 5V | 
                                                                            
                                            | Number of Inputs | 8 | 
                                                                            
                                            | Output Characteristics | 3-STATE | 
                                                                            
                                            | Current - Output High, Low | 2.6mA 8mA | 
                                                                            
                                            | Max I(ol) | 0.008 A | 
                                                                            
                                            | Prop. Delay@Nom-Sup | 45 ns | 
                                                                            
                                            | Voltage Supply Source | Single Supply | 
                                                                            
                                            | Independent Circuits | 1 | 
                                                                            
                                            | RoHS Status | Non-RoHS Compliant | 
                                                                                                    
                            
                         
                                                SN74LS251N Overview
In order to conserve board space, digital switch is included in the 16-DIP (0.300, 7.62mm).As a result, it is packaged in the way of Tube.Mounting is performed using Through Hole.For the analog part of the multiplexers, an IC Multiplexer is used.The operating temperature of 0°C~70°C will not be susceptible to external factors.When operated with a 4.75V~5.25V supply voltage, digital controlled switch provides digital controlled switch's superior flexibility for designers.Multiplexers of the 74LS series can be used in a wide range of applications.Among its basic configurations are 16 terminations.In this case, 5V is the voltage supplied to the multiplexer's system.For mux switch's normal operation, there is a power supply provided at 5V.This multiplexer has a total of 8 inputs.
SN74LS251N Features
Supplied in the 16-DIP (0.300, 7.62mm) package
Power supplies of 5V
SN74LS251N Applications
There are a lot of Rochester Electronics, LLC SN74LS251N Signal Switches / Multiplexers / Decoders applications. 
- Code converters
- RF-based home automation system
- Microprocessor instruction decoding
- D/A converters
- Electronics industry
- Frequency multiplexing system
- A robotic vehicle with the metal detector
- Microprocessor input/output systems
- Code conversion
- Used to connect a single source to multiple destinations