SBVS299A April   2017  – September 2025 REF31-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Supply Voltage
      2. 7.3.2 Thermal Hysteresis
      3. 7.3.3 Temperature Drift
      4. 7.3.4 Noise Performance
      5. 7.3.5 Long-Term Stability
      6. 7.3.6 Load Regulation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Negative Reference Voltage
      2. 7.4.2 Data Acquisition
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.5 Electrical Characteristics

at TA = 25°C, ILOAD = 0mA, and VIN = 5V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
REF3312-Q1(1) — 1.25V
VOUT Output voltage 1.2475 1.25 1.2525 V
Initial accuracy –0.2% 0.2%
Output voltage noise f = 0.1Hz to 10Hz 17 μVPP
f = 10Hz to 10kHz 24 μVRMS
REF3120-Q1 — 2.048V
VOUT Output voltage 2.0439 2.048 2.0521 V
Initial accuracy –0.2% 0.2%
Output voltage noise f = 0.1Hz to 10Hz 27 μVPP
f = 10Hz to 10kHz 39 μVRMS
REF3125-Q1 — 2.5V
VOUT Output voltage 2.495 2.5 2.505 V
Initial accuracy –0.2% 0.2%
Output voltage noise f = 0.1Hz to 10Hz 33 μVPP
f = 10Hz to 10kHz 48 μVRMS
REF3130-Q1 — 3V
VOUT Output voltage 2.994 3 3.006 V
Initial accuracy –0.2% 0.2%
Output voltage noise f = 0.1Hz to 10Hz 39 μVPP
f = 10Hz to 10kHz 57 μVRMS
REF3133-Q1 — 3.3V
VOUT Output voltage 3.2934 3.3 3.3066 V
Initial accuracy –0.2% 0.2%
Output voltage noise f = 0.1Hz to 10Hz 43 μVPP
f = 10Hz to 10kHz 63 μVRMS
REF3140-Q1 — 4.096V
VOUT Output voltage 4.0878 4.096 4.1042 V
Initial accuracy –0.2% 0.2%
Output voltage noise f = 0.1Hz to 10Hz 53 μVPP
f = 10Hz to 10kHz 78 μVRMS
REF31xx-Q1 (REF3112-Q1, REF3120-Q1, REF3125-Q1, REF3130-Q1, REF3133-Q1, REF3140-Q1)
dVOUT/dT Output voltage temperature drift(2) TA = 0°C to 70°C. 5 15 ppm/°C
TA = –40°C to +125°C . 10 20
Long-term stability 0 to 1000 hours 70 ppm
Line regulation VREF + 0.05(1) ≤ VIN ≤ 5.5 V 20 65 ppm/V
dVOUT/dILOAD Load regulation(3) Sourcing 0 mA < ILOAD < 10 mA, VIN = VREF + 250 mV(1) 10 30 µV/mA
Sinking –10 mA < ILOAD < 0 mA, VIN = VREF + 100mV(1) 20 50
dT Thermal hysteresis(4) First Cycle 100 ppm
Additional Cycles 25
VIN – VOUT Dropout voltage(1) TA = –40°C to +125°C. 5 50 mV
ILOAD Output current –10 10 mA
ISC Short-circuit current Sourcing 50 mA
Sinking 40
Turnon settling time To 0.1% at VIN = +5V with CL = 0μF 400 µs
POWER SUPPLY
VS Voltage ILOAD = 0, TA = –40°C to +125°C. VREF + 0.05(1) 5.5 V
IQ Quiescent current ILOAD = 0, TA = 25°C 100 115 µA
ILOAD = 0, TA = –40°C to +125°C 115 135
(1) Minimum supply voltage for the REF3112 is 1.8V.
(2) Box Method used to determine temperature drift.
(3) Typical value of load regulation reflects measurements using force and sense contacts; see Load Regulation.
(4) Thermal hysteresis is explained in more detail in Application and Implementation of this data sheet.