SLVS969H October   2009  – January 2025 TL331-Q1 , TL331B-Q1 , TL391B-Q1

PRODMIX  

  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, TL331-Q1, TL331E-Q1
    2. 5.2  Absolute Maximum Ratings, TL331B-Q1 and TL391B-Q1
    3. 5.3  ESD Ratings, All Devices
    4. 5.4  Recommended Operating Conditions, TL331-Q1, TL331E-Q1
    5. 5.5  Recommended Operating Conditions, TL331B-Q1 and TL391B-Q1
    6. 5.6  Thermal Information
    7. 5.7  Electrical Characteristics, TL331B-Q1 and TL391B-Q1
    8. 5.8  Switching Characteristics, TL331B-Q1 and TL391B-Q1
    9. 5.9  Electrical Characteristics, TL331-Q1, TL331E-Q1
    10. 5.10 Switching Characteristics, TL331-Q1, TL331E-Q1
    11. 5.11 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
    4. 6.4 Device Functional Modes
      1. 6.4.1 Voltage Comparison
  8. 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
        1. 7.2.2.1 Input Voltage Range
        2. 7.2.2.2 ESD Protection
        3. 7.2.2.3 Minimum Overdrive Voltage
        4. 7.2.2.4 Output and Drive Current
        5. 7.2.2.5 Response Time
      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
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    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
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3 Feature Description

The TL331-Q1 consists of a PNP Darlington pair input, allowing the device to operate with very high gain and fast response with minimal input bias current. The input Darlington pair creates a limit on the input common mode voltage capability, allowing TL331-Q1 to accurately function from ground to VCC – 1.5V differential input. A clamp (Q15) was added around Q3 to force the output low when both inputs are taken above the VCM range.

The output consists of an open collector NPN (pull-down or low side) transistor. The output NPN sinks current when the negative input voltage is higher than the positive input voltage and the offset voltage. The VOL is resistive and scales with the output current. Please see Output Low Voltage vs. Output Sinking Current at 5V for VOL values with respect to the output current.