SNIS249 May   2025 LM50-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics: LM50-Q1
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 LM50-Q1 Transfer Function
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Full-Range Centigrade Temperature Sensor
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Capacitive Loads
        3. 8.2.1.3 Application Curve
    3. 8.3 System Examples
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
      3. 8.5.3 Thermal Considerations
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1.      Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

3 Description

The LM50-Q1 device is an automotive-grade analog temperature sensor (AEC-Q100 Grade 1 qualified) that can measure temperatures from -40°C to 125°C using a single positive supply. The output voltage of the device is linearly proportional to temperature (10mV/°C) and has a DC offset of 500mV at 0°C. The offset allows reading negative temperatures without the need for a negative supply. The output voltage of the LM50-Q1 ranges from 100mV (at –40°C) to 1.75V (at 125°C), simplifying automotive ADC interfacing (including ADC integrated in MCU).

Unlike NTC thermistors, LM50-Q1 does not require any external calibration, trimming or software linearization leading to simplifying the circuitry requirements in a single supply environment. Due to low quiescent current of LM50-Q1 (typically around 95µA), self-heating is limited to a very low 0.2°C (in still air) and the device is ideal for automotive applications such as ECUs. Trimming and calibration of LM50-Q1 at the wafer level verify low cost and consistent accuracy: (±3°C at 25°C, ±4°C across –40°C to 125°C). Functional safety documentation is also available for systems requiring enhanced reliability.

Package Information
PART NUMBERPACKAGE(1)PACKAGE SIZE(2)
LM50-Q1DBZ (SOT-23, 3)2.37mm × 2.92mm
(1) For more information, see Section 11.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
LM50-Q1 Simplified SchematicSimplified Schematic
LM50-Q1 Full-Range Centigrade Temperature Sensor (–40°C to 125°C)Full-Range Centigrade Temperature Sensor (–40°C to 125°C)