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LM139: LM139ADR Product consultation

Ivy Chen
Prodigy 70 points
Part Number: LM139
Other Parts Discussed in Thread: TLV1871, TLV1872

Hi

The M139A series is a four-channel voltage comparator from TI. Among all my products, the LM139AD and LM139ADR (the only difference between the two is the packaging)
After checking, starting from the 2022 version of the manual, the description of the application to dual power supplies and the voltage range of the dual power supplies in the old version of the datasheet has been removed. However, the new version of the datasheet does not provide a clear description of the dual power supply mode
Could you please help confirm whether this device can still be applied to dual power supplies? And is the voltage range of its dual power supply the same as before? Because this was deleted from the new datasheet, is it no longer applicable or is there some other reason?20251016103548.png20251016103524.png

  • 0
    TI__Guru 62676 points

    Hello Ivy,

    The reference to the split supplies was removed to make room for the added feature lines.

    Split supply operation is completely possible and is common. As long as the total supply voltage across V+ and GND is within the recommended supply voltage (03V, 32V or 36V - depending on family) and the input voltage stays within the valid input range (V- to 2V below V+).

    But keep in mind that the output will be pulled to the negative supply voltage (V-) and NOT GND. This may require level-shifting if interfacing to ground-referenced logic.

    If a ground-referenced output (0 to +3.3V for example) is required on a split +15/-15 supply, see the TLV1871 and TLV1872, which have a separate output supply and are designed for split supply applications.