LTC2905 - Precision Dual Supply Monitor with Pin-Selectable Thresholds


  • Monitors Two Inputs Simultaneously
  • Nine Threshold Combinations
  • Three Supply Tolerances (5%, 7.5%, 10%)
  • Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature
  • Internal VCC Auto Select
  • Power Supply Glitch Immunity
  • 200ms Reset Time Delay (LTC2904 Only)
  • Adjustable Reset Time Delay (LTC2905 Only)
  • Open Drain RST Output
  • Guaranteed RST for V1 ≥ 1V or V2 ≥ 1V
  • Low Profile (1mm) SOT-23 (ThinSOT™) and Plastic (3mm x 2mm) DFN Packages

Typical Application

LTC2905 Typical Application
LTC2905 Typical Application


The LTC2904/LTC2905 are dual supply monitors intended for systems with two supply voltages. The dual supply monitors have a common reset output with delay (200ms for the LTC2904 and adjustable using an external capacitor for the LTC2905). This product provides a precise, space-conscious and micropower solution for supply monitoring.

The LTC2904/LTC2905 feature a tight 1.5% threshold accuracy over the whole operating temperature range, and glitch immunity to ensure reliable reset operation without false triggering. The open drain RST output is guaranteed to be in the correct state for inputs down to 1V.

The LTC2904/LTC2905 also feature three programming input pins, which program the threshold and tolerance level without requiring any external components. These three programming pins provide a total of 27 different voltage level and tolerance combinations, eliminating the need to have different parts for development and implementation of different systems with different voltage levels requiring monitoring function.


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
LTC2905CDDB#PBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2905CDDB#TRMPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2905CDDB#TRPBF 3x2 DFN-8 DDB C 05-08-1702 Yes
LTC2905CTS8#PBF SOT-23 TS8 C 05-08-1637 Yes
LTC2905CTS8#TRMPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2905CTS8#TRPBF SOT-23 TS8 C 05-08-1637 Yes
LTC2905HDDB#PBF 3x2 DFN-8 DDB H 05-08-1702 Yes
LTC2905HDDB#TRMPBF 3x2 DFN-8 DDB H 05-08-1702 Yes
LTC2905HDDB#TRPBF 3x2 DFN-8 DDB H 05-08-1702 Yes
LTC2905HTS8#PBF SOT-23 TS8 H 05-08-1637 Yes
LTC2905HTS8#TRMPBF SOT-23 TS8 H 05-08-1637 Yes
LTC2905HTS8#TRPBF SOT-23 TS8 H 05-08-1637 Yes
LTC2905IDDB#PBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2905IDDB#TRMPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2905IDDB#TRPBF 3x2 DFN-8 DDB I 05-08-1702 Yes
LTC2905ITS8#PBF SOT-23 TS8 I 05-08-1637 Yes
LTC2905ITS8#TRMPBF SOT-23 TS8 I 05-08-1637 Yes
LTC2905ITS8#TRPBF SOT-23 TS8 I 05-08-1637 Yes

LTC2905 Package Drawing
LTC2905 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
LTC2905CDDB#PBF 3x2 DFN-8 C $1.97 Yes
LTC2905CDDB#TRMPBF 3x2 DFN-8 C $1.97 $1.43 Yes
LTC2905CDDB#TRPBF 3x2 DFN-8 C $1.97 $1.41 Yes
LTC2905CTS8#PBF SOT-23 C $1.97 Yes
LTC2905CTS8#TRMPBF SOT-23 C $1.97 $1.43 Yes
LTC2905CTS8#TRPBF SOT-23 C $1.97 $1.41 Yes
LTC2905HDDB#PBF 3x2 DFN-8 H $2.46 Yes
LTC2905HDDB#TRMPBF 3x2 DFN-8 H $2.46 $1.77 Yes
LTC2905HDDB#TRPBF 3x2 DFN-8 H $2.46 $1.72 Yes
LTC2905HTS8#PBF SOT-23 H $2.46 Yes
LTC2905HTS8#TRMPBF SOT-23 H $2.46 $1.77 Yes
LTC2905HTS8#TRPBF SOT-23 H $2.46 $1.72 Yes
LTC2905IDDB#PBF 3x2 DFN-8 I $2.23 Yes
LTC2905IDDB#TRMPBF 3x2 DFN-8 I $2.23 $1.58 Yes
LTC2905IDDB#TRPBF 3x2 DFN-8 I $2.23 $1.56 Yes
LTC2905ITS8#PBF SOT-23 I $2.23 Yes
LTC2905ITS8#TRMPBF SOT-23 I $2.23 $1.58 Yes
LTC2905ITS8#TRPBF SOT-23 I $2.23 $1.56 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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