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TL331-EP Absolute Maximum Ratings

Patrick Courtney
Prodigy 10 points
Other Parts Discussed in Thread: TL331-EP

After completing a design it was found that the absolute maximum ratings on the TL331-EP comparator were being exceeded in 2 operation modes for the system. The maximum rating lists the input voltage for V+ or V- as -0.3V. 

Mode 1: V+ = -5.3V, V- = 0V, Vcc = 0V

Mode 2: V+ = -3.9V, V- = 0.4V, Vcc = +20V

For these 2 modes what would the failure mechanism be for the device?

  • 0
    TI__Guru 55970 points
    Hi Patrick ,
    I have moved the thread to Linear forum for best support .
  • 0
    TI__Guru*** 140016 points
    Patrick,

    The input voltage is relative to GND(Vcc-) so I need to know this voltage. Is it 0V?

    The input will resist negative voltage by shunting it to ground.
    Parasitic transistors will draw current from other pins also. The output state may not be correct.

    Limiting the input current to a low level can protect the TL331-EP.

    If V+ was really -5.3V (or -3.9V) and GND was 0V, then device could be damaged because input current is expected to exceed 100mA.

    I am moving post to high reliability forum.
  • 0 in reply to Ron Michallick
    TI__Expert 4420 points

    Patrick, the EP version of this device is the same base design as the commercial device, except that is characterized over a wider temperature range. As a result, what Ronald stated applies to the TL331-EP as well and the device could in fact get damaged under these conditions.

    I should state that yes, you are using the device in an application that it is way beyond the absolute max. ratings of the device as stated in the datasheet.  As mentioned below the table, stresses beyond those listed in the table may cause permanent damage to the device and/or affect reliability. Also, performance as described in the datasheet is not guaranteeed under these conditions as well.

    Thanks,

    JV