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LM311 maximum voltage question

Discussion in 'General Electronics Discussion' started by pgrove, Jan 23, 2020.

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  1. pgrove


    Jan 23, 2020
    I wish to use an LM311 comparator with 25.2 volts on a single rail. (I'm self taught in what little electronics I know, so apologies if I misuse terms) Max voltage is listed on the data sheet as 18 volts. However, it's keyed to the following: "All voltage values, unless otherwise noted, are with respect to the midpoint between VCC+ and VCC-". If I am using a single rail power source, it seems to me that VCC- in my case would be zero volts, making the midpoint 12.6 volts. 18 volts over the midpoint would be 30.6 volts, placing my intended voltage well within limits. Am I correct?


    May 20, 2017
    The absolute maximum voltage quoted on the datasheet is ± 18V which means a single supply could be up to 36V. I wouldn't recommend running one at that level. For safety's sake, ±15 V or 30V single rail would be the max' you should consider running it at.
    Harald Kapp likes this.
  3. pgrove


    Jan 23, 2020
    Thanks much. (I'll be staying well away from 36 volts...)
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