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Original question:

LM185-1.2QML-SP: Package lid (metal body) connection

LM185-1.2QML-SP: 5962R8759461VXA

Bob Wasley
Prodigy 50 points

Part Number: LM185-1.2QML-SP

Tool/software:

Questions to ask TI regarding LM185-1.2 (5962R8759461VXA)

  1. If the voltage reference diode is installed backwards and is forward biased for the life of the part, is there any impact on its mission life?
  2. In this configuration, it is operating with a fwd current of 1.3mA. Can we use the following specs from the datasheet as evidence that the part will not be degraded in this mode of operation?

Absolute Maximum Ratings:

Forward Current:  10 mA

LM185-1.2 Electrical Characteristics DC Parameters

VF  Forward Bias Voltage, IF = 2 mA:  Min.= -1.0V,  Max = -0.4V

There is particular concern with the above questions from the LM185-1.2qml-sp datasheet Schematic Diagram Ref Des Q14 as the transistor base and collector are tied to the diode anode.

  • 0
    TI__Intellectual 1235 points

    Hi Bob,

    The datasheet seems to allow this mode based upon the same specs mentioned in your post. However, I'll need to do more research to determine if this mode is safe for the device as forward biased is not the device's intended use. I will get back to you with an update by early next week.

    Thanks,
    Elizabeth