SCLS252O October   1995  – July 2024 SN54AHCT240 , SN74AHCT240

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Switching Characteristics
    7. 5.7 Noise Characteristics
    8. 5.8 Operating Characteristics
    9. 5.9 Typical Characteristics
  7.   Parameter Measurement Information
  8. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
    4. 6.4 Device Functional Modes
  9. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  10. 8 Device and Documentation Support
    1. 8.1 Documentation Support (Analog)
      1. 8.1.1 Related Links
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  11. 9 Revision History
  12. 10Mechanical, Packaging, and Orderable Information

5.4 Thermal Information

THERMAL METRIC(1)SN74AHCT240UNIT
DW (SOIC)DB (SSOP)N (PDIP)NS (SOPPW (TSSOP)
20 PINS20 PINS20 PINS20 PINS20 PINS
RθJAJunction-to-ambient thermal resistance81.199.954.980.4116.8°C/W
RθJC(top)Junction-to-case (top) thermal resistance48.961.741.746.958.5
RθJBJunction-to-board thermal resistance53.855.235.847.978.7
ψJTJunction-to-top characterization parameter19.522.627.919.912.6
ψJBJunction-to-board characterization parameter53.154.835.747.577.9
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report.