Texas Instruments LM74500-Q1 Reverse Polarity Protection Controller

Texas Instruments LM74500-Q1 Reverse Polarity Protection Controller

Texas Instruments LM74500-Q1 Reverse Polarity Protection Controller is an automotive AEC Q100 qualified controller which operates in conjunction with an external N-channel MOSFET as a low loss reverse polarity protection solution. The wide supply input range of 3.2V to 65V allows control of many popular DC bus voltages such as 12V, 24V, and 48V automotive battery systems. The 3.2V input voltage support is particularly well suited for severe cold crank requirements in automotive systems. The device can withstand and protect the loads from negative supply voltages down to –65V. The LM74500-Q1 does not have reverse current blocking and is suitable for input reverse polarity protection of loads that can potentially deliver energy back to the input supply, such as automotive body control module motor loads.

The Texas Instruments LM74500-Q1 controller provides a charge pump gate drive for an external N-channel MOSFET. The high voltage rating of LM74500-Q1 helps to simplify the system designs for automotive ISO7637 protection. With the enable pin low, the controller is off and draws approximately 1µA of current, thus offering low system current when put into sleep mode.


  • AEC-Q100 qualified with the following results
    • Device temperature grade 1 (–40°C to +125°C ambient operating temperature range)
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • 3.2V to 65V input range (3.9V startup)
  • –65V input reverse voltage rating
  • Charge pump for external N-Channel MOSFET
  • Enable pin feature
  • 1µA shutdown current (EN=Low)
  • 80µA typical operating quiescent current (EN=High)
  • Meets automotive ISO7637 pulse 1 transient requirements with additional TVS Diode
  • Available in 8-pin SOT-23 package 2.90mm × 1.60mm


more information: https://www.ti.com/product/LM74500-Q1

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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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