I had a quick question about the TL331 input voltage. I need a comparator that will take in a differential input of 36V. After reading the data sheet, the absolute max ratings table indicates a max Vin of +36 but this should be considered with bullet point 1 just below the table:
Also, Note 3 just below the Electrical Characteristics table indicates the following:
Normally operation up to the absolute maximum ratings is not recommended, but there is a bullet point on page 1 of the data sheet that indicates the following which conflicts with Note 3 above and invites operation up to the absolute max:
So will this comparator be able to take a differential voltage input of 36V, if not is there any suggested ICs that can do this or suggestions on ways around this?
The absolute maximum input range is -0.3V to 36V. This applies regardless to the other input or VCC level.The device is tested up to 30V so that is proven for every device and 36V is also good, but that is based on past performance.You can resistivity divide your 36V input to a more reasonable level. Do both inputs really swing or is one input fixed?You want to have al least one input in the range of 0V to VCC-2V at all times to ensure a valid output.
Regards,Ronald MichallickLinear Applications
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A customer just wanted to verify: he would like to have one input to be fixed as the reference voltage (0.5V ~ TBD) and the other input can be 0 to 32V. The Vcc has to be fixed at 5V.
- I just wanted to be absolutely sure that if one input ends up being fixed at Vcc-2V and the other will be at 0 to 32V max, will the device still be safe to work? Thank you a bunch for the help!
Yes, it is safe and functional.
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