Other Parts Discussed in Thread: LM339, TLV1702
The Datasheet from Linear shows that there are Input Protection Diodes for the LM319.
However, the TI datasheet does not. Does the TI Chip contain those Input Protection Diodes?
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Hello Hansel,
Exceeding the Abs Max voltage can damage the base-emitter junctions of the input stage transistors, which would cause changes in offset and possibly response time.
8V is into the damage territory - especially if current is not limited. Long term reliability (lifetime) will be affected.
Don't do it!!
You can add a 5V (or less) Zener externally (similar to what Linear did internally) along with series resistors to limit the current. Of course, this would cause the inputs to be clamped together when the differential voltage exceeds 5V. Your circuit would need to be reviewed to make sure this would not cause problems.
Thanks Paul,
I'm currently using the LM319 because of the following:
However, I do need the negative input voltage to be able to go from 0-15 Volts, which due to the Differential Input Voltage and Minimum Input Voltage (with a 0-15V supply) the LM319 doesn't work too well.
Would you have any recommendations for another open collector comparator that can do this? Most 15V comparators seem to have the same problems as the LM319. Maybe the LM339?
Best Regards,
Hansel Qiu
The TLV1702 should work for you. It has rail to rail input capability and meets the other criteria.