LM397 Single General Purpose Voltage Comparator | TI.com

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Single General Purpose Voltage Comparator



The LM397 device is a single voltage comparator with an input common mode that includes ground. The LM397 is designed to operate from a single 5-V to 30-V power supply or a split power supply. Its low supply current is virtually independent of the magnitude of the supply voltage.

The LM397 features an open-collector output stage. This allows the connection of an external resistor at the output. The output can directly interface with TTL, CMOS and other logic levels, by tying the resistor to different voltage levels (level translator).

The LM397 is available in the space-saving 5-Pin SOT-23 package and is pin-compatible to TI’s TL331, a single differential comparator.


  • TA = 25°C. Typical Values Unless Otherwise
  • 5-Pin SOT-23 Package
  • Industrial Operating Range −40°C to +85°C
  • Single or Dual Power Supplies
  • Wide Supply Voltage Range 5 V to 30 V
  • Low Supply Current 300 µA
  • Low Input Bias Current 7 nA
  • Low Input Offset Current ±1 nA
  • Low Input Offset Voltage ±2 mV
  • Response Time 440 ns (50-mV Overdrive)
  • Input Common-Mode Voltage 0 to VS – 1.5 V


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Part number Order Number of channels (#) Output type Propagation delay time (µs) Vs (Max) (V) Vs (Min) (V) Package Group Vos (offset voltage @ 25 C) (Max) (mV) Iq per channel (Typ) (mA) Input bias current (+/-) (Max) (nA) Rail-to-rail Rating Operating temperature range (C) Package size: mm2:W x L (PKG) Features VICR (Max) (V) VICR (Min) (V) Approx. price (US$)
LM397 Order now 1     Open Collector     0.44     30     5     SOT-23 | 5     7     0.25     250     Out     Catalog     -40 to 85     5SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 5)     Standard comparator     28.5     0     0.19 | 1ku