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Help identifying OpAmp

Joseph Lackey
Prodigy 30 points
Other Parts Discussed in Thread: LM358

Designation on chip, may be a fake, LM358-4AA-P1VMG3. I have a device using this chip that failed within hours of being placed into service. The device is used to control a DC motor, brushless, with 24 VDC input varied from zero to 24 volts to control speed of motor. i have not been able to find a chip with these markings so a suggestion on a substitute would be great.

  • 0
    TI__Guru*** 139956 points
    Joseph,

    The LM358DRG3 has this marking format.
    Is this a new or old design? Is there only one failure?
  • 0 in reply to Ron Michallick
    Prodigy 30 points

    Thank you for the response Ron. Yes one failure. 

    The chip is designated in three lines:

    LM358        no other letters or numbers on this line

    4AA             no other letters or numbers on this line

    P1VMG3    no other letters or numbers on this line.

    I can send a picture if it would help. I believe it is a new design since this product only became available late last year. However it could very well be a counterfeit chip. The product is designed and produced in China by a Chinese company. I would rather use a genuine TI chip to replace the faulty one so if you can recommend a substitute I would appreciate it.

    The device takes a 24 VDC supply splits into two outputs. These outputs are then controlled by a 0-10 VDC  control signal to vary motor speed from 0 to 100% output. The motor typically runs directly off the 24 VDC power supply. 

    The part of the board that is not pictured is simply the remaing connection for the second output.

  • 0 in reply to Joseph Lackey
    TI__Guru*** 139956 points

    Joseph,

    You can get samples, buy from TI, or from a recommended distributor from the LM358 product page.
    www.ti.com/.../samplebuy

  • 0 in reply to Ron Michallick
    Prodigy 30 points
    Thank you Ron. I will take advantage of your suggestion.
    Joe Lackey