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R3121 Series
36V Input Voltage Detector with Release Delay Function

Product Specifications

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

FEATURES

  Consumer Industrial Automotive
Operating Voltage Range (Maximum Rating) 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 to 85°C -40 to 105°C -40 to 125°C
Supply Current R3121NxxxA/G: Typ. 3.8 µA
R3121NxxxE: Typ. 3.5 µA
Detector Threshold Range 3.0 V to 12.0 V (in 0.1 V step)
Detector Threshold Accuracy ±1.5% (Ta = 25°C)
±2.0% (-40°C ≤ Ta ≤ 85°C)
±1.5% (Ta = 25°C)
±2.0% (-40°C ≤ Ta ≤ 105°C)
±1.5% (Ta = 25°C)
-2.2% to 2.5% (-40°C ≤ Ta ≤ 125°C)
Release Delay Accuracy -35% to 40% (-40°C ≤ Ta ≤ 85°C) -35% to 40% (-40°C ≤ Ta ≤ 105°C) -40% to 80% (-40°C ≤ Ta ≤ 125°C)
Output Type Nch Open Drain
Package SOT-23-6

APPLICATION INFORMATION

VDD Pin Detection Type

SENSE Pin Detection Type

TIMING CHART

R3121NxxxA

R3121NxxxG

R3121NxxxE

PIN DESCRIPTION

SOT-23-6

SOT-23-62.9 mm × 2.8 mm
1 CD
2 NC
3 NC (A/G), SENSE (E)
4 VDD
5 GND
6 DOUT

R3121 Series for Consumer

APPLICATIONS

  • Power supply voltage monitoring for Laptop PCs, Digital TVs, Cordless phones and Private LAN systems
  • Power supply voltage monitoring for devises with multi-cell battery

SELECTION GUIDE

The detector threshold and the voltage detection type are user selectable options.

Product Name   Package Quantity per Reel
R3121Nxxx#-TR-FE Consumer SOT-23-6 3,000
  • xxx … Specify the detector threshold (−VDET) in the range of 3.0 V (030) to 12.0 V (120) in 0.1 V step.
  • # … Select the voltage detection type from the following;
    A: VDD Pin Detection Type
    E: SENSE Pin Detection Type
    G: VDD Pin Detection without Hysteresis Type

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
SOT-23-6 R3121N R3121N (-FE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.


R3121 Series for Industrial

This product is a high-reliability semiconductor device for industrial application that has passed both the screening at high temperature and the reliability test with extended hours. Ricoh accommodates requests including the long-time operation and high temperature environment use.


APPLICATIONS

  • Industrial equipments such as FAs and smart meters
  • Equipments used under high-temperature conditions such as surveillance camera and vending machine
  • Equipments accompanied by self-heating such as motor and lighting

Operating Temperature Range : -40°C to 105°C


Tjmax 150°C

Unlike the rating of the products for consumer applications at Tjmax = 125°C, the products for automotive applications are rated at high temperature of Tjmax = 150°C. The power dissipation is also rated at high temperature.


SELECTION GUIDE

The detector threshold and the voltage detection type are user selectable options.

Product Name   Package Quantity per Reel
R3121Nxxx#-TR-YE Industrial SOT-23-6 3,000
  • xxx … Specify the detector threshold (−VDET) in the range of 3.0 V (030) to 12.0 V (120) in 0.1 V step.
  • # … Select the voltage detection type from the following;
    A: VDD Pin Detection Type
    E: SENSE Pin Detection Type
    G: VDD Pin Detection without Hysteresis Type

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Marking Reliability*2
SOT-23-6 R3121N R3121N (-YE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.


R3121 Series for Automotive

Ricoh is committed to providing a semiconductor device with the highest level of quality and reliability by restricting the device manufacturing only within Ricoh and the cooperative companies successfully passed our stringent inspections for automotive products. Ricoh established a traceability system and manages manufacturing information and logistics information from the warehouse.


Quality Ranks for Applications

Ricoh offers three different quality ranks for automotive products according to their application purposes.
R3121 Series offer products in Rank 2 and Rank 3.

Rank 2: Automotive General Equipments (Body System)

  • Supervisory circuit for automotive general equipments such as electric window, side mirror, and around view camera

Rank 3: Automotive Accessories

  • Supervisory circuit for car accessories such as car audio equipment, car navigation system, and ETC system

AEC-Q100 Grade 1 Compliant


Operating Temperature Range : -40°C to 125°C


Tjmax 150°C

Unlike the rating of the products for consumer applications at Tjmax = 125°C, the products for automotive applications are rated at high temperature of Tjmax = 150°C. The power dissipation is also rated at high temperature.


SELECTION GUIDE

The detector threshold, the voltage detection type and the quality class are user selectable options.

Product Name   Package Quantity per Reel
R3121Nxxx#-TR-KE AutomotiveAutomotive General EquipmentsAEC-Q100 SOT-23-6 3,000
R3121Nxxx#-TR-AE AutomotiveAutomotive AccessoriesAEC-Q100
  • xxx … Specify the detector threshold (−VDET) in the range of 3.0 V (030) to 12.0 V (120) in 0.1 V step.
  • # … Select the voltage detection type from the following;
    A: VDD Pin Detection Type
    E: SENSE Pin Detection Type
    G: VDD Pin Detection without Hysteresis Type

DOCUMENT/CONTACT

Sample Online

  • Mouser

Purchase

Technical Support

Package*1 Marking Reliability*2
SOT-23-6 R3121N R3121N (-KE) *3
R3121N (-AE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.
*3: The reliability information is not listed for devices above rank2. Please contact Ricoh sales representatives for further informations.

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