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LM741: LM741 Part Number and Power Disipation

Mike Woodard
Prodigy 165 points

Part Number: LM741

1. Is the part number for the LM741A in a TO-99 case LM741AH?

2. What is the maximum power dissipation for the LM741, in a TO-99 case, at 90C?

  • 0
    TI__Expert 4600 points

    Hi Mike,

    We don't have any "A" versions of the LM741. If you are looking for LM741 TO99 package options, the device part numbers would be LM741H/883, LM741H, and LM741H/NOPB.

    The maximum allowable power dissipation of the package itself is set by the junction temperature maximum (150°C) and thermal resistance of the package (167°C/W), which is a function of the ambient temperature. See AN-336 Understanding Integrated Circuit Package Power Capabilities for more details. 

    For the LM741QML TO99 case, the maximum power dissipation at 90°C can be derived from the device absolute maximum ratings and the following equation: 

    PDmax = (TJmax - TA)/Θja)

    (150°C - 90°C) / 167°C/W = 0.359W. 

    General practice is to allow for about 20% headroom in the maximum power dissipation. Therefore, I recommend not exceeding 0.287W of power for your application. Please let me know if you have further questions.

    Best regards,
    Carrie