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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

    pgrove

    2
    0
    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?
     
  2. WHONOES

    WHONOES

    1,113
    310
    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

    pgrove

    2
    0
    Jan 23, 2020
    Thanks much. (I'll be staying well away from 36 volts...)
     
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