LTC2903-1 - Precision Quad Supply Monitor in 6-Lead SOT-23


  • Ultralow Voltage Reset: VCC = 0.5V Guaranteed
  • Monitor Four Inputs Simultaneously
    3.3V, 2.5V, 1.8V, ADJ (LTC2903-A1)
    5V, 3.3V, 2.5V, 1.8V (LTC2903-B1)
    5V, 3.3V, 1.8V, –5.2V (LTC2903-C1)
    3.3V, ADJ, ADJ, ADJ (LTC2903-D1)
    5V, ADJ, ADJ, ADJ (LTC2903-E1)
  • Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage over Temperature
  • 10% (A1, B1, C1) and 5% (D1, E1) Undervoltage Monitoring
  • Low Supply Current: 20µA Typical
  • 200ms Reset Time Delay
  • Active Low Open-Drain RST Output
  • Power Supply Glitch Immunity
  • Low Profile (1mm) SOT-23 (ThinSOTTM) Package

Typical Application

LTC2903-1 Typical Application
LTC2903-1 Typical Application


The LTC2903-1 monitors up to four supply voltages. The common reset output remains low until all four inputs have been in compliance for 200ms. Voltage thresholds maintain ±1.5% accuracy over temperature (with respect to the monitored voltage). The LTC2903-1 features an open-drain RST output with a weak internal pullup.

Internal supply voltage (VCC) is generated from the greater voltage on the V1, V2 inputs. VCC = V1 for LTC2903-D1 and LTC2903-E1. The RST output is guaranteed to sink at least 5µA (VOL = 0.15V) for VCC down to 0.5V and will typically conduct current down to 0V. Quiescent current is 20µA typical, making the LTC2903-1 ideal for power conscious systems. The LTC2903-1 is available in a 6-lead low profile (1mm) SOT-23 package.


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
LTC2903CS6-A1#PBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-A1#TRMPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-A1#TRPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-B1#PBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-B1#TRMPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-B1#TRPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-C1#PBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-C1#TRMPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-C1#TRPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-D1#PBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-D1#TRMPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-D1#TRPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-E1#PBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-E1#TRMPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903CS6-E1#TRPBF SOT-23 S6 C 05-08-1636 Yes
LTC2903IS6-A1#PBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-A1#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-A1#TRPBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-B1#PBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-B1#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-B1#TRPBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-C1#PBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-C1#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-C1#TRPBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-D1#PBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-D1#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-D1#TRPBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-E1#PBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-E1#TRMPBF SOT-23 S6 I 05-08-1636 Yes
LTC2903IS6-E1#TRPBF SOT-23 S6 I 05-08-1636 Yes

LTC2903-1 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
LTC2903CS6-A1#PBF SOT-23 C $2.48 Yes
LTC2903CS6-A1#TRMPBF SOT-23 C $2.48 $1.76 Yes
LTC2903CS6-A1#TRPBF SOT-23 C $2.48 $1.71 Yes
LTC2903CS6-B1#PBF SOT-23 C $2.48 Yes
LTC2903CS6-B1#TRMPBF SOT-23 C $2.48 $1.76 Yes
LTC2903CS6-B1#TRPBF SOT-23 C $2.48 $1.71 Yes
LTC2903CS6-C1#PBF SOT-23 C $2.66 Yes
LTC2903CS6-C1#TRMPBF SOT-23 C $2.66 $1.86 Yes
LTC2903CS6-C1#TRPBF SOT-23 C $2.66 $1.81 Yes
LTC2903CS6-D1#PBF SOT-23 C $2.48 Yes
LTC2903CS6-D1#TRMPBF SOT-23 C $2.48 $1.76 Yes
LTC2903CS6-D1#TRPBF SOT-23 C $2.48 $1.71 Yes
LTC2903CS6-E1#PBF SOT-23 C $2.48 Yes
LTC2903CS6-E1#TRMPBF SOT-23 C $2.48 $1.76 Yes
LTC2903CS6-E1#TRPBF SOT-23 C $2.48 $1.71 Yes
LTC2903IS6-A1#PBF SOT-23 I $2.84 Yes
LTC2903IS6-A1#TRMPBF SOT-23 I $2.84 $2.01 Yes
LTC2903IS6-A1#TRPBF SOT-23 I $2.84 $1.96 Yes
LTC2903IS6-B1#PBF SOT-23 I $2.84 Yes
LTC2903IS6-B1#TRMPBF SOT-23 I $2.84 $2.01 Yes
LTC2903IS6-B1#TRPBF SOT-23 I $2.84 $1.96 Yes
LTC2903IS6-C1#PBF SOT-23 I $2.36 Yes
LTC2903IS6-C1#TRMPBF SOT-23 I $2.36 $2.11 Yes
LTC2903IS6-C1#TRPBF SOT-23 I $2.36 $2.06 Yes
LTC2903IS6-D1#PBF SOT-23 I $2.84 Yes
LTC2903IS6-D1#TRMPBF SOT-23 I $2.84 $2.01 Yes
LTC2903IS6-D1#TRPBF SOT-23 I $2.84 $1.96 Yes
LTC2903IS6-E1#PBF SOT-23 I $2.84 Yes
LTC2903IS6-E1#TRMPBF SOT-23 I $2.84 $2.01 Yes
LTC2903IS6-E1#TRPBF SOT-23 I $2.84 $1.96 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.

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