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AM26C31: Reliability

Part Number: AM26C31
Other Parts Discussed in Thread: SN75LBC172

In the d/s, it says the max output current is +/-20mA. How is the reliability when drawing output current up to  +/-20mA for a long time (maybe great than 500hours) at max. ambient temp.  in this test, Is output voltage of differential still normally? or is there reliability report you can offer? 

Regards

Brian W