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Series voltage references

REF33

ACTIVE

30-ppmC drift, 3.9-uA, 3-pin SOT-23, 3-pin SC70, 8-pin UQFN voltage reference

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Data sheet

REF33

ACTIVE
Data sheet Order now

Product details

Rating Catalog VO (V) 1.25, 1.8, 2, 2.5, 3, 3.3 Temp coeff (max) (ppm/°C) 30 Initial accuracy (max) (%) 0.15 Iout/Iz (max) (mA) 5 Vin (min) (V) 1.7 Vin (max) (V) 5.5 Iq (typ) (mA) 0.0039 TI functional safety category Functional Safety-Capable LFN 0.1 to 10 Hz (typ) (µVPP) 35 Operating temperature range (°C) -40 to 125
Rating Catalog VO (V) 1.25, 1.8, 2, 2.5, 3, 3.3 Temp coeff (max) (ppm/°C) 30 Initial accuracy (max) (%) 0.15 Iout/Iz (max) (mA) 5 Vin (min) (V) 1.7 Vin (max) (V) 5.5 Iq (typ) (mA) 0.0039 TI functional safety category Functional Safety-Capable LFN 0.1 to 10 Hz (typ) (µVPP) 35 Operating temperature range (°C) -40 to 125
— (—) — See data sheet
  • Microsize packages: SC70-3, SOT-23-3, UQFN-8
  • Low supply current: 3.9µA (typical)
  • Extremely low dropout voltage: 110mV (typical)
  • High output current: ±5mA
  • Low temperature drift: 30ppm/°C (maximum)
  • High initial accuracy: ±0.15% (maximum)
  • 0.1Hz to 10Hz noise: 35µVPP (REF3312)
  • Voltage options: 1.2V, 1.8V, 2.5V, 3V, 3.3V
  • Microsize packages: SC70-3, SOT-23-3, UQFN-8
  • Low supply current: 3.9µA (typical)
  • Extremely low dropout voltage: 110mV (typical)
  • High output current: ±5mA
  • Low temperature drift: 30ppm/°C (maximum)
  • High initial accuracy: ±0.15% (maximum)
  • 0.1Hz to 10Hz noise: 35µVPP (REF3312)
  • Voltage options: 1.2V, 1.8V, 2.5V, 3V, 3.3V

The REF33xx is a low-power, precision, low-dropout voltage reference family available in tiny SC70-3 and SOT-23-3 packages, and in a 1.5mm × 1.5mm UQFN-8 package. Small size and low power consumption (5µA maximum) make the REF33xx ideal for a wide variety of portable and battery-powered applications.

The REF33xx can be operated at a supply voltage 180mV above the specified output voltage under normal load conditions, with the exception of the REF3312, which has a minimum supply voltage of 1.7V. All models are specified for the wide temperature range of –40°C to +125°C.

The REF33xx is a low-power, precision, low-dropout voltage reference family available in tiny SC70-3 and SOT-23-3 packages, and in a 1.5mm × 1.5mm UQFN-8 package. Small size and low power consumption (5µA maximum) make the REF33xx ideal for a wide variety of portable and battery-powered applications.

The REF33xx can be operated at a supply voltage 180mV above the specified output voltage under normal load conditions, with the exception of the REF3312, which has a minimum supply voltage of 1.7V. All models are specified for the wide temperature range of –40°C to +125°C.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet REF33xx 3.9μA, SC70-3, SOT-23-3, and UQFN-8, 30ppm/°C Drift Voltage Reference datasheet (Rev. I) PDF | HTML Apr 9, 2026
Technical article Accurately measure vital signs with low Iq and a small form factor (Rev. B) PDF | HTML Apr 18, 2024
Application note Voltage Reference Selection and Design Tips For Data Converters (Rev. B) PDF | HTML Jan 9, 2024
Selection guide Current Sense Amplifiers (Rev. E) Sep 20, 2021
E-book Tips and tricks for designing with voltage references (Rev. A) May 7, 2021
White paper Simplifying Signal Chain Design for High Performance in Small Systems Oct 22, 2020
Application brief High-Performance 16-bit PWM to 4- to 20-mA DAC for Field Transmitters Mar 26, 2020
Functional safety information REF33xx Functional Safety FIT Rate and Failure Mode Distribution Dec 18, 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun 28, 2019
Application note Diode-Based Temperature Measurements (Rev. A) May 17, 2019
White paper Voltage reference selection basics white paper (Rev. A) Oct 23, 2018
Application brief Level Shifting Signals With Differential Amplifiers (Rev. A) Apr 2, 2018
Analog design Journal Getting the most out of your instrumentation amplifier design Oct 10, 2005

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

REF3312 PSpice Model (Rev. A)

SBOM230A.ZIP (55 KB) - PSpice model
Supported products & hardware
Simulation model

REF3312 TINA-TI Reference Design (Rev. A)

SBOM231A.TSC (89 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

REF3318 PSpice Model (Rev. B)

SBOM233B.ZIP (36 KB) - PSpice model
Supported products & hardware
Simulation model

REF3318 TINA-TI Reference Design (Rev. A)

SBOM234A.TSC (94 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

REF3318 TINA-TI Spice Model (Rev. A)

SBOM235A.ZIP (6 KB) - TINA-TI Spice model
Supported products & hardware
Simulation model

REF3320 PSpice Model (Rev. A)

SBOM236A.ZIP (36 KB) - PSpice model
Supported products & hardware
Simulation model

REF3320 TINA-TI Reference Design (Rev. A)

SBOM237A.TSC (93 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

REF3320 TINA-TI Spice Model (Rev. A)

SBOM238A.ZIP (6 KB) - TINA-TI Spice model
Supported products & hardware
Simulation model

REF3325 PSpice Model (Rev. A)

SBOM239A.ZIP (36 KB) - PSpice model
Supported products & hardware
Simulation model

REF3325 TINA-TI Reference Design (Rev. A)

SBOM240A.TSC (93 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

REF3325 TINA-TI Spice Model (Rev. A)

SBOM241A.ZIP (6 KB) - TINA-TI Spice model
Supported products & hardware
Simulation model

REF3330 PSpice Model (Rev. A)

SBOM242A.ZIP (36 KB) - PSpice model
Supported products & hardware
Simulation model

REF3330 TINA-TI Reference Design (Rev. A)

SBOM243A.TSC (106 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

REF3330 TINA-TI Spice Model (Rev. A)

SBOM244A.ZIP (6 KB) - TINA-TI Spice model
Supported products & hardware
Simulation model

REF3333 PSpice Model (Rev. A)

SBOM245A.ZIP (36 KB) - PSpice model
Supported products & hardware
Simulation model

REF3333 TINA-TI Reference Design (Rev. A)

SBOM246A.TSC (107 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

REF3333 TINA-TI Spice Model (Rev. A)

SBOM247A.ZIP (6 KB) - TINA-TI Spice model
Supported products & hardware
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