LTC1726 - Triple Supply Monitor and µP Supervisor with Adjustable Reset and Watchdog Timer


  • Monitors Three Inputs Simultaneously
    LTC1726-5: 5V, 3.3V and ADJ
    LTC1726-2.5: 2.5V, 3.3V and ADJ
  • ±1.5% Threshold Accuracy Over Temperature
  • Low Supply Current: 16μA Typ
  • Adjustable Reset Timeout
  • Adjustable Watchdog Timeout
  • Active Low Open-Drain Reset Output
  • Power Supply Glitch Immunity
  • Guaranteed RESET for VCC3 ≥ 1V or VCC25/VCC5 ≥ 1V
  • MS8 and SO-8 Packages

Typical Application

LTC1726 Typical Application
LTC1726 Typical Application


The LTC1726 is a triple supply monitor and microprocessor supervisory circuit with adjustable reset and watchdog functions intended for systems with multiple supply voltages. The part has a common open-drain reset output with an adjustable delay. The reset and watchdog time-out periods are both adjustable using external capacitors.

Tight 1.5% accuracy specifications and glitch immunity ensure reliable reset operation without false triggering.

The RST output is guaranteed to be in the correct state for VCC5/VCC25 or VCC3 down to 1V. The LTC1726 may also be configured to monitor any one or two VCC inputs instead of three, depending on system requirements.

The low (16μA typical) supply current makes the LTC1726 ideal for power-conscious systems.


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
LTC1726EMS8-2.5#PBF MS-8 MS8 E 05-08-1660 Yes
LTC1726EMS8-2.5#TRPBF MS-8 MS8 E 05-08-1660 Yes
LTC1726EMS8-5#PBF MS-8 MS8 E 05-08-1660 Yes
LTC1726EMS8-5#TRPBF MS-8 MS8 E 05-08-1660 Yes
LTC1726ES8-2.5#PBF SO-8 S8 E 05-08-1610 (S8) Yes
LTC1726ES8-2.5#TRPBF SO-8 S8 E 05-08-1610 (S8) Yes
LTC1726ES8-5#PBF SO-8 S8 E 05-08-1610 (S8) Yes
LTC1726ES8-5#TRPBF SO-8 S8 E 05-08-1610 (S8) Yes
LTC1726HMS8-5#PBF MS-8 MS8 H 05-08-1660 Yes
LTC1726HMS8-5#TRPBF MS-8 MS8 H 05-08-1660 Yes
LTC1726IS8-2.5#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1726IS8-2.5#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1726IS8-5#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1726IS8-5#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LTC1726 Package Drawing
LTC1726 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
LTC1726EMS8-2.5#PBF MS-8 E $2.15 $1.85 Yes
LTC1726EMS8-2.5#TRPBF MS-8 E $1.91 Yes
LTC1726EMS8-5#PBF MS-8 E $2.15 $1.85 Yes
LTC1726EMS8-5#TRPBF MS-8 E $1.91 Yes
LTC1726ES8-2.5#PBF SO-8 E $2.10 $1.75 Yes
LTC1726ES8-2.5#TRPBF SO-8 E $1.81 Yes
LTC1726ES8-5#PBF SO-8 E $2.10 $1.75 Yes
LTC1726ES8-5#TRPBF SO-8 E $1.81 Yes
LTC1726HMS8-5#PBF MS-8 H $3.29 $2.30 Yes
LTC1726HMS8-5#TRPBF MS-8 H $2.36 Yes
LTC1726IS8-2.5#PBF SO-8 I $2.35 $2.00 Yes
LTC1726IS8-2.5#TRPBF SO-8 I $2.06 Yes
LTC1726IS8-5#PBF SO-8 I $2.35 $2.00 Yes
LTC1726IS8-5#TRPBF SO-8 I $2.06 Yes
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* 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


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