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TL082: ESD diodes current rate

Sunset
Genius 13395 points
Part Number: TL082

Hello Team,

  • Can you confirm that the TL082 has input ESD diode?
  • What is the maximum current they can withstand?

The TL082H is well specified and says that the inputs have ESD and can withstand 10mA, so you can get over voltage situation on it by limiting the current.

The details are on table 6.1 note 3.

  • Specifically, on the TL082 if I have Vin 15V with 1Mhom limiting the current down to 15uA, would it be a problem for the ESD diode?

The over voltage situation can remain for long time >seconds +.

Thanks,

SunSet

  • 0
    Guru 140200 points

    Hi Sunset (nice name :-),

    no, the standard TL082 does not have ESD protection diodes at the input. So you might want to add external ones? The BAV199 is a low leakage diode and could be used for this. Behind the BAV199 you could add a further current limiting resistor or a resistive voltage divider keeping the input voltage below the supply voltage.

    Can you tell a bit more about your application? Why is there 15V reaching the input while the TL082 is inpowered?

    Kai

  • 0
    TI__Guru*** 140136 points

    Hello Sunset,

    TL082H will have ESD protection on the inputs. TL082 does not have ESD specific structures. 

    For TL082 inputs must be in the range of VCC- to VCC- + 30V where input current is nearly zero.

    Is your case VCC- = VCC+ = 0V and the input is 15V with 1M series resistance?  If yes, the TL082 should not be damaged. 

    An external diode will be helpful if voltage could peak above 30V 

  • 0 in reply to Ron Michallick
    TI__Genius 13395 points

    I was indeed looking at the TL082H since it is looking better specified.

    The TL082 is more vague.

    But table 6.4 has the following: "ESD Ratings: All Other Devices", which sounds that the non H version also have ESD diode protection.

    If Vcc is less than 15V and the input goes up to 15V, the series R on the input (1Mohm) is enough to protect the device or is it still recommended to have the additional protection? 

    ...in which case the TL082H would be better, since I can just limit I with R below 10mA.

    Thanks,

    SunSet

  • 0 in reply to Sunset
    TI__Guru*** 140136 points

    SunSet,

    TL082H will be better, but it is not available quite yet. 

    For TL082, input can exceed VCC+ but a resistor should be used anyway. What is the value for VCC-?