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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 EOL EOL EOL EOL EOL NRND EOL
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
Outline Dimension, Footprint, Drawing Download Download Download Download Download Download Download
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
Power Management for Video Doorbell App. Note2021/10/08
Part NumberPackage TypePackage Qty.DistributorStockBuy From Authorized Distributor
RT9818A-27GVSOT-233,000 Digikey 0 Lead-Time: 14 weeks
2,975 Last Time Buy
2026/12/31
RT9818A-28GVSOT-233,000 Digikey 0 Lead-Time: 14 weeks
2,975 Last Time Buy
2026/12/31
RT9818A-30GBSOT-253,000 Digikey 0 Lead-Time: 14 weeks
2,883 Last Time Buy
2026/12/31
RT9818A-30GVSOT-233,000 Digikey 0 Lead-Time: 14 weeks
3,000 Last Time Buy
2026/12/31
RT9818B-18GVSOT-233,000 Digikey 5,901 Last Time Buy
2026/12/31
0 Lead-Time: 14 weeks
RT9818B-35GBSOT-253,000 Digikey 0 Lead-Time: 14 weeks
2,978 Last Time Buy
2026/12/31
RT9818C-18GVSOT-233,000 Digikey 0 Lead-Time: 14 weeks
2,940 Last Time Buy
2026/12/31
RT9818C-25GVSOT-233,000 Digikey 1,778 Last Time Buy
2026/12/31
2,990 Last Time Buy
2026/12/31
RT9818C-27GU3SC-70-33,000 Digikey 4,835 Last Time Buy
2026/12/31
0 Lead-Time: 14 weeks
RT9818C-27GVSOT-233,000 Digikey 0 Lead-Time: 14 weeks
2,815 Last Time Buy
2026/12/31
RT9818C-29GVSOT-233,000 Digikey 0 Lead-Time: 14 weeks
4,027 Last Time Buy
2026/12/31
RT9818C-29GVLSOT-233,000 Digikey 0 Lead-Time: 14 weeks
3,000 Last Time Buy
2026/12/31
RT9818C-30GVSOT-233,000 Digikey 0 Lead-Time: 14 weeks
5,208 Last Time Buy
2026/12/31
RT9818C-30GVLSOT-233,000 Digikey 415 Last Time Buy
2026/12/31
3,000 Last Time Buy
2026/12/31
RT9818C-42GVSOT-233,000 Digikey 1,381 Last Time Buy
2026/12/31
2,785 Last Time Buy
2026/12/31
RT9818C-44GVSOT-233,000 Digikey 0 Lead-Time: 14 weeks
2,995 Last Time Buy
2026/12/31
RT9818D-27GVSOT-233,000 Digikey 0 Lead-Time: 14 weeks
3,000 Last Time Buy
2026/12/31
RT9818E-27GBSOT-253,000 Digikey 0 Lead-Time: 14 weeks
9,000 Last Time Buy
2026/12/31
RT9818G-30GVLSOT-233,000 Digikey 0 Lead-Time: 14 weeks
2,997 Last Time Buy
2026/12/31
Please confirm with our distributor or sales representative for actual stock status.
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