Skip to main content Skip to first level navigation
Skip to main content First level navigation Menu
Contact Us About Us ricoh.com
Breadcrumbs
Facebook (Open link in new window) YouTube (Open link in new window) LinkedIn (Open link in new window)
Main content
Main content

R3121 Series

36V Input Voltage Detector with Release Delay Function

  • Consumer
  • Industrial
  • Automotive
  • PLP
  • AEC-Q100
  • RoHS

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

Specs & Datasheets

  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

Download Datasheet

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
  • gradeConsumerC
  • plpP
SOT-23-6 R3121N R3121N-FE
R3121Nxxxx-TR-YE
  • gradeIndustrialI
  • plpP
SOT-23-6 R3121N R3121N-YE
R3121Nxxxx-TR-KE
  • gradeAutomotiveA
  • aecQ1001
  • plpP
SOT-23-6 R3121N R3121N-KE
R3121Nxxxx-TR-AE
  • gradeAutomotiveA
  • aecQ1001
  • plpP
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.

Sample / Buy

Functional Description

Search for similar products under conditions below.

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