Ultra-Low-Power, Low-Cost Comparators with 2% Reference

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The MAX931–MAX934 single, dual, and quad micropower, low-voltage comparators plus an on-board 2% accurate reference feature the lowest power consumption available. These comparators draw less than 4µA supply current over temperature (MAX931), and include an internal 1.182V ±2% voltage reference, programmable hysteresis, and TTL/CMOS outputs that sink and source current.

Ideal for 3V or 5V single-supply applications, the MAX931–MAX934 operate from a single +2.5V to +11V supply (or a ±1.25V to ±5V dual supply), and each comparator's input voltage range extends from the negative supply rail to within 1.3V of the positive supply.

The MAX931–MAX934's unique output stage continuously sources as much as 40mA. And by eliminating power-supply glitches that commonly occur when comparators change logic states, the MAX931–MAX934 minimize parasitic feedback, making them easier to use.

The single MAX931 and dual MAX932/MAX933 provide a unique and simple method for adding hysteresis without feedback and complicated equations, using the HYST pin and two resistors.

For applications that require increased precision with similar power requirements, see the MAX921–MAX924 data sheet. These devices include a 1% precision reference.
MAX931, MAX932, MAX933, MAX934: Typical Operating Circuit MAX931, MAX932, MAX933, MAX934: Typical Operating Circuit Enlarge+

Key Features

  • Ultra-Low 4µA Max Quiescent Current over Extended Temp. Range (MAX931)
  • Power Supplies:
    • Single +2.5V to +11V
    • Dual ±1.25V to ±5.5V
  • Input Voltage Range Includes Negative Supply
  • Internal 1.182V ±2% Bandgap Reference
  • Adjustable Hysteresis
  • TTL-/CMOS-Compatible Outputs
  • 12µs Propagation Delay (10mV Overdrive)
  • No Switching Crowbar Current
  • 40mA Continuous Source Current
  • Available in Space-Saving µMAX® Package


  • Alarm Circuits
  • Battery-Powered Applications
  • Oscillator Circuits
  • Threshold Detectors
  • Window Comparators

See parametric specs for Comparators + Reference (48)

Part NumberComparatorsThresh.
Internal Reference Accuracy
Prog. Hyst.VOS
Logic OutOper. Temp.
(typ)(min)(max)(max)(max)(See Notes)
MAX931 11.1822122.5113.2Yes10TTL/CMOS
-40 to +85
0 to +70
SOIC (N)/8
$2.36 @1k
MAX932 24.5Yes
SOIC (N)/8
$2.66 @1k
MAX933 24.5Yes
SOIC (N)/8
$2.66 @1k
MAX934 46.6No
SOIC (N)/16
$2.98 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: MAX931.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
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