These data selectors/multiplexers contain full binary decoding to select one-of-eight data sources and feature controlled complementary 3-state outputs.

The 3-state outputs can interface with and drive data lines of bus-organized systems. With all but one of the common outputs disabled (at the high-impedance state), the low impedance of the signal-enabled output drives the bus line to a high or low logic level. Both outputs are controlled by the output-enable (OE\) input. The outputs are disabled when is high.

The SN54ALS251 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS251 is characterized for operation from 0°C to 70°C.

D0, D1,...D7 = the level of the respective D input

• 3-State Version of the ALS151
• 3-State Outputs Interface Directly With System Bus
• Perform Parallel-to-Serial Conversion
• Complementary Outputs Provide True and Inverted Data
• Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs

• Technology Family
• ALS
• Function
• Digital Multiplexer
• Configuration
• 8:1
• Number of channels (#)
• 1
• Operating temperature range (C)
• 0 to 70
• Rating
• Catalog

SN74ALS251的完整型号有：SN74ALS251D、SN74ALS251DR、SN74ALS251N，以下是这些产品的关键参数及官网采购报价：

SN74ALS251D，工作温度：0 to 70，封装：SOIC (D)-16，包装数量MPQ：40个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74ALS251D的批量USD价格：.57（1000+）

SN74ALS251DR，工作温度：0 to 70，封装：SOIC (D)-16，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74ALS251DR的批量USD价格：.475（1000+）

SN74ALS251N，工作温度：0 to 70，封装：PDIP (N)-16，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网SN74ALS251N的批量USD价格：.546（1000+）

14-24-LOGIC-EVM 支持 14 到 24 引脚 PW、DB、D、DW、NS、DYY 和 DGV 封装的通用逻辑 EVM

该 EVM 设计用于支持采用 14 至 24 引脚 D、DW、DB、NS、PW、DYY 或 DGV 封装的任何逻辑器件。