SN74F251B 1-of-8 Data Selectors/Multiplexers With 3-State Outputs |

SN74F251B (ACTIVE) 1-of-8 Data Selectors/Multiplexers With 3-State Outputs



These data selectors/multiplexers contain full binary decoding to select one of eight data sources and feature strobe-controlled complementary outputs. The 3-state outputs can interface with and drive data lines of bus-organized systems. When the strobe (G\) input is high, both outputs are in a high-impedance state in which both the upper and lower transistors of each totem-pole output are off, and the output neither drives nor loads the bus significantly.

The SN54F251B is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74F251B is characterized for operation from 0°C to 70°C.



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


  • 3-State Versions of SN54F151B and SN74F151B
  • 3-State Outputs Interface Directly With System Bus
  • Performs Parallel-to-Serial Conversion
  • Complementary Outputs Provide True and Inverted Data
  • Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs



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Part number Order Function Technology Family VCC (Min) (V) VCC (Max) (V) Channels (#) Voltage (Nom) (V) F @ nom voltage (Max) (MHz) ICC @ nom voltage (Max) (mA) tpd @ nom Voltage (Max) (ns) Configuration Type IOL (Max) (mA) IOH (Max) (mA) Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Bits (#) Digital input leakage (Max) (uA) ESD CDM (kV) ESD HBM (kV)
SN74F251B Order now Encoder
F     4.5     5.5     1     5     70     24     9.5     8:1     3-State Output     24     -3     Catalog     0 to 70     PDIP | 16
SOIC | 16    
See datasheet (PDIP)
16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)    
2     5     0.75     2