R3121 Series
36V Input Voltage Detector with Release Delay Function

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  • Description

    R3121 is the 36 V Maximum Input Voltage Detector (Maximum Rating: 50 V). Selectable options of VDD Pin Detection Type (R3121NxxxA), SENSE Pin Detection Type (R3121NxxxE) and VDD Pin Detection without Hysteresis Type (R3121NxxxG), depending on the system configurations.

    • Highly accurate voltage detection with detector threshold accuracy ±1.5% (Ta = 25°C)
    • Selectable options of VDD Pin Detection, SENSE Pin Detection and VDD Pin Detection without Hysteresis
    • Adjustment of the release delay time (Power-on Reset Time) by connecting external capacitors
    • Reduction of mounting area by using compact package of SOT-23-6

  • Spec
    Consumer Industrial Automotive
    Operating Voltage Range R3121NxxxA/G: 1.4 V to 36.0 V (50.0V)
    R3121NxxxE: 2.4 V to 6.0 V (7.0V)
    Operating Temperature Range -40°C to 85°C (125°C) -40°C to 125°C (150°C) -40°C to 125°C (150°C)
    Supply Current R3121NxxxA/G: Typ. 3.8 µA
    R3121NxxxE: Typ. 3.5 µA
    Detector Threshold Range 3.0 V to 12.0 V (0.1 V step)
    Detector Threshold Accuracy ±1.5% (Ta = 25°C)
    ±2.0% (-40°C ≤ Ta ≤ 85°C)    		 ±1.5% (Ta = 25°C)
    -2.2 to 2.5% (-40°C ≤ Ta ≤ 125°C)    		 ±1.5% (Ta = 25°C)
    -2.2 to 2.5% (-40°C ≤ Ta ≤ 125°C)
    Release Delay Time Accuracy -35% to 40% (-40°C ≤ Ta ≤ 85°C) -40% to 80% (-40°C ≤ Ta ≤ 125°C) -40% to 80% (-40°C ≤ Ta ≤ 125°C)
    Output Type Nch Open Drain
    Package SOT-23-6
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  • Technical
    Documents

    • Typical Application

      Typical Application

    • Typical Application

      Typical Application

    • R3121NxxxA Timing Chart

      R3121NxxxA Timing Chart

    • R3121NxxxE Timing Chart

      R3121NxxxE Timing Chart

    • R3121NxxxG Timing Chart

      R3121NxxxG Timing Chart

  • Quality &
    Packages
    Product Name Compatibility Package Marking Reliability
    R3121Nxxxx-TR-FE
    • gradeConsumer
    • plp
    		 SOT-23-6 R3121N R3121N-FE
    R3121Nxxxx-TR-YE
    • gradeIndustrial
    • plp
    		 SOT-23-6 R3121N R3121N-YE
    R3121Nxxxx-TR-KE
    • gradeAutomotive
    • aecQ100
    • plp
    		 SOT-23-6 R3121N R3121N-KE
    R3121Nxxxx-TR-AE
    • gradeAutomotive
    • aecQ100
    • plp
    		 SOT-23-6 R3121N R3121N-AE
    • Refer to the datasheets for the details on the product.
    • The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
    • Please contact us or our distributors for unpublished reliability information.
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Functional Description

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Category:Voltage Detectors (Reset ICs)

VIN
min (V)		 1.4
VIN
max (V)		 36.0
Release
Delay Time 		Adjustable
VDET
min (V)		 3.0
VDET
max (V)		 12.0