R3118N Series

Low VD with Individual SENSE Pin and Delay Function for Automotive Applications


Data Sheet
Data Sheet

The R3118x is a CMOS-based voltage detector IC with individual sense pin, high detector threshold accuracy and delay time, and ultra-low supply current, which can be operated at an extremely low voltage and is used for system reset as an example.
Each of the IC consists of a voltage reference unit, a hysteresis comparator, resistors net for detector threshold setting, an output driver transistor, and a delay circuit.
VDD supply pin for the IC and voltage supervisory sense pin are individual, therefore the output pin can keep "L" level even if the sense pin voltage is going down to 0V, or there is no indefinite range for the sense pin.
Since a delay circuit is built-in, by connecting an external capacitor, any output delay time can be set. In the R3118x series, detector released delay time can be set, and detector delay time is not influenced by the external capacitor for the delay time.
The detector threshold is fixed with high accuracy internally and does not require any adjustment.
The tolerance of the detector threshold is ±22.5mV (−VDET_S<1.6V) or ±1.5% (-VDET_S≥1.6V).
Minimum detector threshold voltage is 0.6V, ultra low voltage detector threshold can be set. Output delay time for the detector release can be set with high accuracy. The tolerance of the IC side is ±30%.
Two output types, Nch open drain type and CMOS type are available. If the sense pin voltage becomes to equal or lower than the detector threshold voltage, the output voltage becomes "L", and if the sense pin voltage becomes to released voltage, the output voltage becomes "H" after the set delay time.
The R3118x supports SOT-23-5 package.


Operating Voltage Range (Maximum Rating) 1.0V to 6.0V (7.0V)
Supply Current Typ. 0.4μA (VSENSE≥+VDET, VDD=6V)
Consumption current through SENSE pin is not included.
Detector Threshold Range 0.6V to 5.0V (0.1V steps)
For other voltages, refer to MARK INFORMATIONS.
Accuracy Detector Threshold ±1.5% (-VDET_S≥1.6V), ±22.5mV (-VDET_S<1.6V)
Temperature-Drift Coefficient of Detector Threshold Typ. ±30ppm/°C
Accuracy Detector Released ±30%
Temperature-Drift Coefficient of Detector Released Typ. ±0.16ppm/°C
Output Types Nch Open Drain and CMOS
Package SOT-23-5
* Ta=25°C, unless otherwise noted.


  • Power source for car accessories including car audio equipment, car navigation system, and ETC system.

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Data Sheet Package Quality Assurance Data Suffix Composition & Content*1
R3118N Series SOT-23-5 Reliability -AE Sn (Sn: 100%)
  • *1The composition of the product cannot be specified.

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