LTC1440 - Ultralow Power Single/Dual Comparator with Reference


  • Ultralow Quiescent Current: 2.1µA Typ
  • Reference Output Drives 0.01µF Capacitor
  • Adjustable Hysteresis
  • Wide Supply Range:
     Single: 2V to 11V
     Dual: ±1V to ±5.5V
  • Input Voltage Range Includes the Negative Supply
  • TTL/CMOS Compatible Outputs
  • 12µs Propagation Delay with 10mV Overdrive
  • No Crowbar Current
  • 40mA Continuous Source Current
  • Pin Compatible Upgrades for MAX921/931
  • 3mm x 3mm x 0.75mm DFN Package

Typical Application

LTC1440 Typical Application
LTC1440 Typical Application


The LTC1440 is an ultralow power comparator with a built-in voltage reference. The comparator features less than 4.0µA supply current over temperature.  The internal reference is 1.182V with ±1% accuracy.  The LTC1440 has programmable hysteresis and TTL/CMOS outputs that sink and source current. The reference output can drive a bypass capacitor of up to 0.01µF without oscillation.

The comparators operate from a single 2V to 11V supply or a dual ±1V to ±5.5V supply. Comparator hysteresis is easily programmed by using two resistors and the HYST pin.  Each comparator’s input operates from the negative supply to within 1.3V of the positive supply. The comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, the power supply glitches are eliminated.

The LTC1440 is available in a 3mm x 3mm x 0.75mm DFN package, as well as 8-pin PDIP and SO-8.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC1440CDD#PBF 3x3 DFN-8 DD C 05-08-1698 Yes
LTC1440CDD#TRPBF 3x3 DFN-8 DD C 05-08-1698 Yes
LTC1440CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LTC1440CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LTC1440CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1440CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1440CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1440IDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC1440IDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LTC1440IMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LTC1440IMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes
LTC1440IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LTC1440IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1440IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LTC1440 Package Drawing
LTC1440 Package Drawing
LTC1440 Package Drawing
LTC1440 Package Drawing
LTC1440 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC1440CDD#PBF 3x3 DFN-8 C $2.36 $1.65 Yes
LTC1440CDD#TRPBF 3x3 DFN-8 C $1.75 Yes
LTC1440CMS8#PBF MS-8 C $2.15 $1.65 Yes
LTC1440CMS8#TRPBF MS-8 C $1.71 Yes
LTC1440CN8#PBF N-8 C $1.85 $1.45 Yes
LTC1440CS8#PBF SO-8 C $1.85 $1.45 Yes
LTC1440CS8#TRPBF SO-8 C $1.51 Yes
LTC1440IDD#PBF 3x3 DFN-8 I $2.64 $1.85 Yes
LTC1440IDD#TRPBF 3x3 DFN-8 I $1.95 Yes
LTC1440IMS8#PBF MS-8 I $2.64 $1.85 Yes
LTC1440IMS8#TRPBF MS-8 I $1.91 Yes
LTC1440IN8#PBF N-8 I $2.20 $1.70 Yes
LTC1440IS8#PBF SO-8 I $2.20 $1.70 Yes
LTC1440IS8#TRPBF SO-8 I $1.76 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


  • Battery-Powered System Monitoring
  • Threshold Detectors
  • Window Comparators
  • Oscillator Circuits

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email with questions and comments.

Design Tools


LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:

Technical Support