Tiny CMOS Comparator with Rail-to-Rail Input and Open Drain Output

Tiny CMOS Comparator with Rail-to-Rail Input and Open Drain Output - LMC7221


The LM7221 is a micropower CMOS comparator available in the space saving 5-Pin SOT-23 package. This makes this comparator ideal for space and weight critical designs. The LMC7221 is also available in the 8-Pin SOIC package. The LMC7221 is supplied in two offset voltage grades, 5 mV and 15 mV.

The open drain output can be pulled up with a resistor to a voltage which can be higher or lower than the supply voltage—this makes the part useful for mixed voltage systems.

For a tiny comparator with a push-pull output, please see the LMC7211 datasheet.


  • Tiny 5-Pin SOT-23 package saves space
  • Package is less than 1.43 mm thick
  • Ensured specs at 2.7V, 5V, 15V supplies
  • Typical supply current 7 μA at 5V
  • Response time of 4 μs at 5V
  • LMC7221—open drain output
  • Input common-mode range beyond V and V+
  • Low input current

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Parametrics Compare all products in Comparators

Number of Channels (#)
Output Type
Vs (Min) (V)
Vs (Max) (V)
Propagation Delay Time (uS)
Vos (Offset Voltage @ 25C) (Max) (mV)
Iq per channel (Max) (mA)
Input Bias Current (+/-) (Max) (nA)
Operating Temperature Range (C)
Reference Voltage (V)
VICR (Max) (V)
VICR (Min) (V)
Package Group
LMC7221 LMP7300 LPV7215
1    1    1   
Open Collector    Open Collector    Push-Pull   
2.7    2.7    2.7   
15    12    5.5   
4    7.7    12   
5    0.75    3.4   
0.014    0.016    0.00092   
0.0004    3    0.001   
In    No    No   
Catalog    Catalog    Catalog   
-40 to 85    -40 to 125    -40 to 125   
N/A    Hysteresis
Internal Reference   
Small Size   
15.2    11.1    5.5   
-0.2    1    0   

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