Thanks to Paul Grohe for his response regarding LM108 and LM148. I have a similar question about LF156 (National die) stemming from the same power supply reversal.
As with the above parts, the negative power supply was driven to about +0.3V for no longer than 35 milliseconds. During this time, the negative input voltage was at ground, resulting in violation of a note on the LF156 datasheet which states "the absolute maximum negative input voltage is equal to the negative power supply voltage". Th.
Does the same general rule of 5ma on any pin apply to LF156? Is there a reason why parts with JFET inputs might be more prone to damage from this sort of event?