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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Texas Instruments REF2933AIDBZR

Name: REF2933AIDBZR
Brand: Texas Instruments
SKU: REF2933AIDBZR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: REF2933AIDBZR

Manufacturer:: Texas Instruments

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: REF2933AIDBZR.pdf

Description:: IC VREF SERIES 2% SOT23-3

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Product details

Overview

REF2933AIDBZR from Texas Instruments is a precision 3.3 V CMOS band-gap voltage reference in a 3-pin SOT-23 package, delivering ±0.7% initial accuracy (3.234–3.366 V), 100 ppm/°C max temperature drift, 1 mV min dropout, 50 µA max quiescent current, and 25 mA output capability - deployed as a stable reference for ADCs, DACs, and portable instrumentation.

For engineers reviewing the REF2933AIDBZR datasheet, REF2933AIDBZR pinout, REF2933AIDBZR application, or REF2933AIDBZR equivalent, this page delivers verified electrical specs, thermal behavior, load regulation performance, and real-world implementation guidance for low-power, high-accuracy analog signal chains.

Technical Context

The REF2933AIDBZR implements a curvature-compensated band-gap topology with two bipolar transistors (Q1, Q2) biased at different current densities to generate a PTAT voltage across R1, summed with a CTAT V_BE to achieve near-zero temperature coefficient. Its CMOS output stage enables rail-to-rail operation down to 1 mV above V_OUT.

It operates over –40°C to 125°C without external capacitors, exhibits 36 µV_PP (0.1–10 Hz) and 105 µV_RMS (10 Hz–10 kHz) noise, and maintains load regulation of 3–100 µV/mA across 0–25 mA - validated using force-and-sense measurement methodology per TI's characterization protocol.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.3 V nominal; 3.234–3.366 V (±0.7%) over full temperature range - ensures consistent ADC full-scale calibration across industrial environments.
Initial Accuracy	±2% (per family spec); ±0.7% typical for REF2933 - reduces system-level trimming requirements in production test.
Temperature Drift	Max 100 ppm/°C (–40°C to 125°C); typ. 50 ppm - supports <1 LSB error in 16-bit systems over full operating range.
Dropout Voltage	1 mV minimum (unloaded); ≤50 mV at 25 mA - enables operation from 3.35 V supply in battery-powered systems with minimal headroom.
Quiescent Current	Max 50 µA (25°C); max 59 µA (–40°C to 125°C) - extends battery life in always-on sensor nodes and portable meters.
Noise Performance	36 µV_PP (0.1–10 Hz); 105 µV_RMS (10 Hz–10 kHz) - meets SNR targets for 16-bit SAR and ΔΣ converters without external filtering.
Load Current	25 mA maximum - drives multiple op-amps, ADC references, and digital isolator bias rails simultaneously.

Pinout & Package

SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount, JEDEC MO-178 compatible - optimized for space-constrained PCB layouts in handheld and IoT edge devices.

Pin/Terminal	Circuit Role	Design Meaning
1 (IN)	Input supply voltage	Accepts 3.35–5.5 V input; must be ≥ V_OUT + 1 mV (unloaded) or ≥ V_OUT + 50 mV (25 mA load) to maintain regulation.
2 (OUT)	Reference output voltage	Provides stable 3.3 V output; no mandatory load capacitor required; stable with any capacitive load including low-ESR ceramics.
3 (GND)	Ground reference	Common return path for input and output; requires low-impedance connection to solid ground plane to minimize noise coupling and thermal gradients.

Key Features

Feature	Design Value
MicroSIZE SOT-23 package	2.92 mm × 1.30 mm footprint - saves >70% board area vs. SOIC-8 references, enabling ultra-compact data acquisition modules.
Low dropout operation	1 mV minimum dropout - allows direct use from regulated 3.3 V rails with margin for aging and tolerance, eliminating need for higher-voltage LDOs.
High output current	25 mA continuous - powers entire analog front-end (e.g., op-amp bias, ADC reference, sensor excitation) from single reference.
Low temperature drift	≤100 ppm/°C over –40°C to 125°C - guarantees <±0.04% output shift across automotive under-hood or industrial ambient conditions.
Low quiescent current	50 µA max - enables multi-year battery life in wireless sensor nodes operating at 100 µA average system current.

Applications

Portable Medical Sensors	Data Acquisition Systems
Use Scenario: Battery-powered ECG front-end conditioning analog signals before digitization by a 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides precise 3.3 V reference for ADC full-scale calibration and op-amp biasing in dual-supply signal chain. Use Value: Enables <±0.5 LSB total unadjusted error (TUE) over –20°C to 55°C without factory recalibration.	Use Scenario: Modular industrial DAQ module measuring thermocouple, RTD, and voltage inputs with simultaneous sampling. IC Role / Device Role / Timing Role: Supplies stable 3.3 V reference to multiple ADCs and programmable gain amplifiers on shared PCB. Use Value: Maintains channel-to-channel gain matching within ±0.01% across temperature via common reference source.
Hand-Held Test Equipment	Automotive Diagnostic Tools
Use Scenario: Portable multimeter with autoranging, true-RMS conversion, and Li-ion battery operation. IC Role / Device Role / Timing Role: Serves as primary reference for internal 24-bit ΔΣ ADC and precision voltage/current source calibration. Use Value: Supports 5½-digit resolution with <10 ppm/year long-term stability (24 ppm @ 1000 hrs).	Use Scenario: OBD-II scan tool with CAN interface, display, and analog sensor monitoring (e.g., battery voltage, coolant temp). IC Role / Device Role / Timing Role: Delivers accurate 3.3 V supply for microcontroller I/O, CAN transceiver bias, and analog front-end reference. Use Value: Ensures reliable CAN communication and sensor reading accuracy across –40°C to 105°C vehicle operating range.

Portable Medical Sensors

Data Acquisition Systems

Use Scenario: Battery-powered ECG front-end conditioning analog signals before digitization by a 16-bit SAR ADC.

IC Role / Device Role / Timing Role: Provides precise 3.3 V reference for ADC full-scale calibration and op-amp biasing in dual-supply signal chain.

Use Value: Enables <±0.5 LSB total unadjusted error (TUE) over –20°C to 55°C without factory recalibration.

Use Scenario: Modular industrial DAQ module measuring thermocouple, RTD, and voltage inputs with simultaneous sampling.

IC Role / Device Role / Timing Role: Supplies stable 3.3 V reference to multiple ADCs and programmable gain amplifiers on shared PCB.

Use Value: Maintains channel-to-channel gain matching within ±0.01% across temperature via common reference source.

Hand-Held Test Equipment

Automotive Diagnostic Tools

Use Scenario: Portable multimeter with autoranging, true-RMS conversion, and Li-ion battery operation.

IC Role / Device Role / Timing Role: Serves as primary reference for internal 24-bit ΔΣ ADC and precision voltage/current source calibration.

Use Value: Supports 5½-digit resolution with <10 ppm/year long-term stability (24 ppm @ 1000 hrs).

Use Scenario: OBD-II scan tool with CAN interface, display, and analog sensor monitoring (e.g., battery voltage, coolant temp).

IC Role / Device Role / Timing Role: Delivers accurate 3.3 V supply for microcontroller I/O, CAN transceiver bias, and analog front-end reference.

Use Value: Ensures reliable CAN communication and sensor reading accuracy across –40°C to 105°C vehicle operating range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage reference applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX6033AESA+	3.3 V, ±0.5% initial accuracy, 20 ppm/°C drift, 15 µA IQ, SO-8 package	Lower drift and IQ but larger SO-8 footprint; requires external decoupling cap	Preferred where ultra-low drift dominates over size/power; not drop-in due to package and pinout mismatch
ADR3433ARJZ-R7	3.3 V, ±0.1% initial accuracy, 10 ppm/°C drift, 120 µA IQ, SOT-23-5 package	Higher accuracy and lower drift, but 2.4× higher IQ and 5-pin layout requiring PCB redesign	Selected when sub-LSB error budget demands tighter specs; incompatible pinout prevents direct replacement

Compared with MAX6033AESA+ and ADR3433ARJZ-R7, REF2933AIDBZR offers optimal balance of SOT-23 size, 50 µA IQ, and 100 ppm/°C drift for cost-sensitive, space-constrained industrial and portable designs - trading absolute precision for integration and power efficiency.

Availability

REF2933AIDBZR is available at Aetrix Electronics and suitable for portable medical sensors, data acquisition systems, hand-held test equipment, and automotive diagnostic tools requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for REF2933AIDBZR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in precision analog ICs.

The REF29xx series was designed specifically for low-power, high-accuracy voltage referencing in portable, battery-operated, and industrial measurement systems - emphasizing micro-size packaging, ultra-low IQ, and robust thermal performance.

FAQ

What is the minimum input voltage required for stable operation of the REF2933AIDBZR?

The REF2933AIDBZR requires a minimum input voltage of V_OUT + 1 mV (i.e., 3.301 V) under no-load conditions. At full 25 mA load, the minimum input rises to V_OUT + 50 mV (3.35 V). This ultra-low dropout enables direct use from standard 3.3 V LDO outputs with adequate margin, as confirmed in Section 7.3 of the SBVS033C datasheet.

Does the REF2933AIDBZR require an output capacitor for stability?

No, the REF2933AIDBZR is internally compensated and stable with any capacitive load - including zero capacitance. A 0.47 µF ceramic bypass capacitor is recommended at the IN pin per Section 9.1, but no output capacitor is mandatory. This eliminates risk of oscillation with low-ESR ceramic or polymer caps commonly used in portable designs.

What is the long-term stability performance of the REF2933AIDBZR?

The REF2933AIDBZR exhibits 24 ppm drift over the first 1000 hours and 15 ppm drift from 1000 to 2000 hours, based on accelerated testing of 30 units (Section 7.5, "Long-term stability"). This translates to <±0.003% output change after 2000 hours - critical for field-deployed instrumentation where recalibration is impractical.

How does thermal hysteresis affect REF2933AIDBZR accuracy in cycling environments?

Thermal hysteresis for REF2933AIDBZR is specified at 25–100 ppm (Section 7.5), defined as output voltage shift after cycling from 25°C → –40°C → 125°C → 25°C. This effect is distinct from temperature drift and impacts repeatability in applications with repeated thermal cycling, such as automotive engine bay sensors or outdoor environmental monitors.

Can REF2933AIDBZR drive multiple ADC references simultaneously?

Yes - the REF2933AIDBZR delivers up to 25 mA output current, sufficient to power multiple 3.3 V ADC references (e.g., ADS7822, ADS868x) and associated op-amps. Load regulation remains within 100 µV/mA (3–100 µV/mA typical), ensuring <±250 µV shift across full 25 mA range - verified using force-and-sense methodology per Figure 26 in the datasheet.

REF2933AIDBZR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: TO-236-3, SC-59, SOT-23-3

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Reference Type:: Series

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Current - Output:: 25 mA

Tolerance:: ±2%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: 36µVp-p

Noise - 10Hz to 10kHz:: 105µVrms

Voltage - Input:: 3.35V ~ 5.5V

Current - Supply:: 59µA

Current - Cathode:: -

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

REF2933AIDBZR FAQ

1.How can I place an order for REF2933AIDBZR through Aetrix?

Please submit a Request for Quotation (RFQ) for REF2933AIDBZR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for REF2933AIDBZR reliable?

The price and inventory of REF2933AIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2933AIDBZR is usually 5 days.

3.What payment methods are accepted for REF2933AIDBZR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF2933AIDBZR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for REF2933AIDBZR?

REF2933AIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your REF2933AIDBZR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for REF2933AIDBZR?

For technical support, including REF2933AIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2933AIDBZR requirements.

6.How does Aetrix verify that REF2933AIDBZR is sourced from the original manufacturer or authorized distributors?

All REF2933AIDBZR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that REF2933AIDBZR meets industry standards.

7.What is the process for return or replacement of REF2933AIDBZR?

All REF2933AIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with REF2933AIDBZR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The REF2933AIDBZR part is unused and in its original packaging.

Return procedure for REF2933AIDBZR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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