SCLS132F December   1982  – February 2022 SN54HC251 , SN74HC251

PRODUCTION DATA  

  1. 1 Features
  2. 2 Description
  3. 3 Revision History
  4. 4 Pin Configuration and Functions
  5. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions (1)
    3. 5.3 Thermal Information
    4. 5.4 Electrical Characteristics
    5. 5.5 Switching Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Operating Characteristics
  6. 6 Parameter Measurement Information
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Device Functional Modes
  8. 8 Power Supply Recommendations
  9. 9 Layout
    1. 9.1 Layout Guidelines
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DB|16
  • PW|16
  • NS|16
  • N|16
  • D|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

2 Description

The SNx4HC251 is a data selector/multiplexer containing full binary decoding to select 1-of-8 data sources and features strobe-controlled complementary 3-state outputs.

Device Information
PART NUMBER PACKAGE(1) BODY SIZE (NOM)
SN74HC251D SOIC (16) 9.90 mm × 3.90 mm
SN74HC251DB SSOP (16) 6.20 mm × 5.30 mm
SN74HC251N PDIP (16) 19.31 mm × 6.35 mm
SN74HC251NS SO (16) 6.20 mm × 5.30 mm
SN74HC251PW TSSOP (16) 5.00 mm × 4.40 mm
SN54HC251J CDIP (16) 24.38 mm × 6.92 mm
SNJ54HC251FK LCCC (20) 8.89 mm × 8.45 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
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Pin numbers shown are for the D, DB, J, N, NS, PW, and W packages.

Functional Block Diagram