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The RT9818 is a micro-power voltage detector designed to supervise the power supply voltage levels for microprocessors (μP) or digital systems. It provides internally fixed threshold levels with 0.1V increments, ranging from 1.2V to 5V, covering most digital applications. The device features a low supply current of 3μA. The RT9818 performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset threshold level. This reset signal persists until VDD recovers and surpasses the threshold level, at which point the reset signal is released after a certain delay time. The RT9818 is available in SC-82, SC-70-3, SOT-23-3, SOT-23-5, and SOT-89 packages. The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 85°C.

Applications

  • Desktop/Notebook Computers
  • Critical μP and μC Power Monitoring
  • Portable/Battery-Powered Equipment
  • Controllers
Key Spec.
RT9818A RT9818B RT9818C RT9818D RT9818E RT9818F RT9818G
Status Active Active Active Active Active Active Active
Vin (min) (V) 0.9 0.9 0.9 0.9 0.9 0.9 0.9
Vin (max) (V) 6 6 6 6 6 6 6
VTH (min) (V) 1.2 1.2 1.2 1.2 1.2 1.2 1.2
VTH (max) (V) 5 5 5 5 5 5 5
Accuracy (±%) 1.5 1.5 1.5 1.5 1.5 1.5 1.5
Reset Active Type Low(Open Drain) Low Low Low High High High
Reset Time-out Period (typ) (ms) 0 55 220 450 0 55 220
Reset Delay Time (typ) (ms) 0.02 0.02 0.02 0.02 0.02 0.02 0.02
Package Type SOT-23;SOT-25;SC-70-3;SC-82;SOT-89 SOT-23;SOT-25;SC-70-3;SC-82;SOT-89 SOT-23;SOT-25;SC-70-3;SC-82;SOT-89 SOT-23;SOT-25;SC-70-3;SC-82;SOT-89 SOT-23;SOT-25;SC-70-3;SC-82;SOT-89 SOT-23;SOT-25;SC-70-3;SC-82;SOT-89 SOT-23;SOT-25;SC-70-3;SC-82;SOT-89
Features
  • Internally Fixed Threshold from 1.2V to 5V in 0.1V Step
  • ±1.5% High Accuracy
  • 3μA Low Supply Current
  • No External Components Required
  • Quick Reset within 20μs
  • Built-In Recovery Delay Options: 0ms, 55ms, 220ms, 450ms
  • 0.9V Low Functional Supply Voltage
  • N-Channel Open-Drain Output
  • Available in Small SC-82, SC-70-3, SOT-23-3, SOT-23-5, and SOT-89 Packages
Datasheet
TitleVersionLast UpdateDownload
RT9818: Micro-Power Voltage DetectorV12.02024/11/13
Technical Documents
TitleItem TypeLast UpdateDownload
Richtek Product Selection Guide [Jan., 2024] Selection Guide2024/01/18
Power Management for Video Doorbell App. Note2021/10/08
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT9818A-27GVSOT-233,000 Request Digikey 2,909 Buy
Mouser 2,975 Buy
RT9818A-28GVSOT-233,000 Request Digikey 2,673 Buy
Mouser 2,975 Buy
RT9818A-30GBSOT-253,000 Request Digikey 1,955 Buy
Mouser 2,883 Buy
RT9818A-30GVSOT-233,000 Request Digikey 3,000 Buy
Mouser 3,000 Buy
RT9818B-18GVSOT-233,000 Request Digikey 6,000 Buy
Mouser 0 Lead-Time: 14 weeks
RT9818B-35GBSOT-253,000 Request Digikey 3,000 Buy
Mouser 2,978 Buy
RT9818C-18GVSOT-233,000 Request Digikey 4,713 Buy
Mouser 2,940 Buy
RT9818C-25GVSOT-233,000 Request Digikey 2,218 Buy
Mouser 2,990 Buy
RT9818C-27GU3SC-70-33,000 Request Digikey 6,000 Buy
Mouser 0 Lead-Time: 14 weeks
RT9818C-27GVSOT-233,000 Request Digikey 40,758 Buy
Mouser 2,815 Buy
RT9818C-29GVSOT-233,000 Request Digikey 39,213 Buy
Mouser 4,027 Buy
RT9818C-29GVLSOT-233,000 Request Digikey 3,000 Buy
Mouser 3,000 Buy
RT9818C-30GVSOT-233,000 Request Digikey 8,812 Buy
Mouser 5,208 Buy
RT9818C-30GVLSOT-233,000 Request Digikey 2,015 Buy
Mouser 3,000 Buy
RT9818C-42GVSOT-233,000 Request Digikey 7,557 Buy
Mouser 2,785 Buy
RT9818C-44GVSOT-233,000 Request Digikey 3,000 Buy
Mouser 2,995 Buy
RT9818D-27GVSOT-233,000 Request Digikey 2,490 Buy
Mouser 3,000 Buy
RT9818E-27GBSOT-253,000 Request Digikey 5,970 Buy
Mouser 9,000 Buy
RT9818G-30GVLSOT-233,000 Request Digikey 2,972 Buy
Mouser 2,997 Buy
RT9818G-33GVLSOT-233,000 Request Digikey 2,924 Buy
Mouser 0 Lead-Time: 14 weeks
Please confirm with our distributor or sales representative for actual stock status.
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