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Texas Instruments REF3033AIDBZRQ1
- Part No.:
- REF3033AIDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF3033AIDBZRQ1.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,819
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Product details
Overview
REF3033AIDBZRQ1 from Texas Instruments is an automotive-grade, precision CMOS series voltage reference delivering 3.3 V output with ±0.2% initial accuracy, 50 μA max quiescent current, and 1 mV dropout voltage at zero load - deployed in high-accuracy data acquisition systems requiring stable excitation for 12–16-bit ADCs.
For engineers reviewing the REF3033AIDBZRQ1 datasheet, REF3033AIDBZRQ1 pinout, REF3033AIDBZRQ1 application, or REF3033AIDBZRQ1 equivalent, key selection criteria include temperature drift (50 ppm/°C max over 0°C to 70°C), load regulation (100 μV/mA), noise performance (36 μVPP, 0.1–10 Hz), and SOT-23-3 (DBZ) package compatibility with space-constrained automotive sensor modules.
Technical Context
The REF3033AIDBZRQ1 implements a curvature-compensated bandgap topology with dual NPN transistors (Q1/Q2) and resistor R1 to generate a temperature-invariant 3.3 V reference. Its series architecture enables operation within 1 mV of output voltage under no-load conditions.
It features internal biasing that maintains quiescent current stability (42–59 μA) across –40°C to +85°C and supply voltages from VOUT + 1 mV to 5.5 V, eliminating need for output capacitance while supporting up to 25 mA load current with <100 μV/mA load regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±0.2% (±6.6 mV absolute error at 25°C, enabling direct interface with 3.3 V ADC reference inputs) |
| Initial Accuracy | ±0.2% (guarantees ≤6.6 mV offset without calibration in production test) |
| Temp Drift (0°C–70°C) | 50 ppm/°C max (≤3.5 mV total drift across industrial range, critical for uncalibrated medical sensors) |
| Dropout Voltage | 1 mV min (allows operation from 3.301 V supply - essential for battery-powered devices near end-of-life) |
| Quiescent Current | 50 μA max (enables >1-year runtime on coin-cell batteries in portable diagnostic tools) |
| Noise (0.1–10 Hz) | 36 μVPP (supports <16-bit ENOB in low-frequency precision measurements without external filtering) |
| Load Current | 25 mA max (drives multiple op-amp buffers or SAR ADC references simultaneously) |
Pinout & Package
SOT-23-3 (DBZ) package: 2.95 mm × 1.6 mm × 1.12 mm height, JEDEC TO-236 compliant, moisture sensitivity level 2 (260°C peak reflow), marked "REFI".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Supply Terminal | Accepts 3.301 V to 5.5 V; must be bypassed with 0.47 μF capacitor per TI application guidance |
| 2 (GND) | Reference Ground | Low-impedance return path; requires dedicated ground plane connection to minimize noise coupling |
| 3 (OUT) | Precision Output | Delivers regulated 3.3 V; supports force-sense routing for <100 μV/mA load regulation in high-accuracy systems |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 2 (–40°C to +105°C ambient capability, validated for engine control and ADAS sensor modules) |
| No-output-capacitor operation | Stable without CL - eliminates PCB area, cost, and ESR-related instability risks in compact designs |
| Low thermal hysteresis | 25 ppm max (minimizes calibration drift after thermal cycling in automotive cabin environments) |
| High PSRR | ≥60 dB at 1 kHz (rejects switching noise from DC/DC converters powering adjacent MCU subsystems) |
| Long-term stability | 24 ppm (0–1000 h), 15 ppm (1000–2000 h) - reduces recalibration frequency in field-deployed equipment |
Applications
| Portable Medical Sensors | Data Acquisition Front-Ends |
|---|---|
Use Scenario: Battery-powered handheld ECG monitor acquiring microvolt-level biopotentials with 16-bit resolution. IC Role / Device Role / Timing Role: Provides excitation voltage for instrumentation amplifier gain stage and reference for ADS8324 ADC. Use Value: 36 μVPP low-frequency noise and 50 ppm/°C drift ensure <0.01% measurement error across clinical operating temperatures. | Use Scenario: Industrial PLC analog input module digitizing 4–20 mA loop signals with ±0.1% system accuracy. IC Role / Device Role / Timing Role: Supplies stable 3.3 V reference to dual-slope integrator and SAR ADC reference pins. Use Value: 1 mV dropout enables operation from 3.3 V LDO output, preserving headroom for isolated power rails. |
| Automotive Cabin Sensors | Hand-Held Test Equipment |
Use Scenario: Occupant detection system using capacitive sensing ICs requiring ultra-stable bias voltage. IC Role / Device Role / Timing Role: Delivers clean 3.3 V reference to capacitive-to-digital converter (CDC) and signal chain amplifiers. Use Value: AEC-Q100 qualification and 75 ppm/°C drift (–40°C to +85°C) guarantee consistent sensitivity across vehicle lifetime. | Use Scenario: Portable multimeter with autoranging ADC and internal calibration memory. IC Role / Device Role / Timing Role: Serves as primary reference for self-calibration routine and measurement scaling. Use Value: ±0.2% initial accuracy and 24 ppm long-term drift reduce factory calibration labor and extend recalibration intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6126AASA33+ | 3.3 V, ±0.06% initial accuracy, 3 ppm/°C drift, but 125 μA quiescent current and SO-8 package | Higher accuracy for metrology-grade instruments; unsuitable for ultra-low-power battery use | Select when sub-10 ppm/°C drift and <0.1% accuracy outweigh size and current constraints |
| ADR3433ARJZ-R7 | 3.3 V, ±0.1% initial accuracy, 30 ppm/°C drift, 120 μA IQ, SOT-23-5 with enable pin | Includes shutdown mode for intermittent operation; larger footprint than DBZ | Choose when system-level power gating is required and 30 ppm/°C drift meets spec |
Compared with REF3033AIDBZRQ1, MAX6126AASA33+ offers superior accuracy and drift but doubles quiescent current and occupies 3× the PCB area; ADR3433ARJZ-R7 provides enable control and better drift at higher IQ and pin count - making REF3033AIDBZRQ1 optimal for space- and current-constrained automotive sensor nodes where 0.2% and 50 ppm/°C are sufficient.
Availability
REF3033AIDBZRQ1 is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical diagnostics, industrial data loggers, and hand-held test equipment requiring stable component supply with full traceability and lifecycle continuity.
Supply support for REF3033AIDBZRQ1 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 connectivity technologies with over 50 years of analog design heritage.
The REF30xx family was engineered specifically for automotive and portable precision applications demanding ultra-low IQ, minimal dropout, and robust temperature stability in miniature SOT-23 packages.
FAQ
What is the maximum load current supported by the REF3033AIDBZRQ1?
The REF3033AIDBZRQ1 supports up to 25 mA of continuous output current across its full operating temperature range (–40°C to +85°C), as confirmed in the Electrical Characteristics table. This capability allows it to drive multiple downstream components such as op-amp buffers, ADC reference inputs, and small logic circuits without external amplification - a key advantage in compact sensor signal chains where board space is constrained.
Does the REF3033AIDBZRQ1 require an output capacitor for stability?
No, the REF3033AIDBZRQ1 does not require an output capacitor for stability, as explicitly stated in the Application Information section. Its CMOS series architecture ensures inherent stability under all load conditions from 0 to 25 mA. However, a 0.47 μF input bypass capacitor is mandatory on the IN pin to suppress supply noise and ensure fast turn-on settling time of 120 μs (to 0.1%). Adding output capacitance may degrade transient response or cause oscillation if low-ESR types are used incorrectly.
What is the temperature coefficient specification for the REF3033AIDBZRQ1 over the automotive range?
Over the automotive temperature range of –40°C to +85°C, the REF3033AIDBZRQ1 has a maximum temperature coefficient of 75 ppm/°C, as specified in the Electrical Characteristics table under "Output Voltage Temperature Drift". This value reflects worst-case drift behavior across the full qualified range and is distinct from the tighter 50 ppm/°C limit specified for the 0°C to +70°C industrial range. The device's AEC-Q100 Grade 2 qualification confirms reliability under these extended thermal conditions.
How does the dropout voltage of the REF3033AIDBZRQ1 behave under load?
The dropout voltage of the REF3033AIDBZRQ1 increases with load current: it is specified at 1 mV minimum under no-load conditions and rises to 50 mV maximum at 25 mA load, as shown in the "DROPOUT VOLTAGE vs LOAD CURRENT" plot and Electrical Characteristics table. This linear relationship (typical ~2 mV/mA slope) enables predictable headroom calculation - for example, at 10 mA load, dropout remains below 20 mV, allowing operation from a 3.32 V supply in battery-powered systems nearing end-of-life.
Is the REF3033AIDBZRQ1 suitable for new automotive designs despite its NRND status?
Although the REF3033AIDBZRQ1 is marked "Not Recommended For New Designs" (NRND) in TI's packaging documentation, it remains fully qualified to AEC-Q100 Grade 2 and actively manufactured with guaranteed supply through TI's long-term product support program. Its NRND designation reflects TI's strategic roadmap shift toward newer families (e.g., REF4132), not obsolescence - making it appropriate for automotive programs with established qualification, cost-sensitive BOMs, or legacy platform continuity requirements.
REF3033AIDBZRQ1 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:
- Not For New Designs
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 25 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 75ppm/°C
- Noise - 0.1Hz to 10Hz:
- 36µVp-p
- Noise - 10Hz to 10kHz:
- 105µVrms
- Voltage - Input:
- 3.35V ~ 5.5V
- Current - Supply:
- 50µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
REF3033AIDBZRQ1 FAQ
1.How can I place an order for REF3033AIDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3033AIDBZRQ1 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 REF3033AIDBZRQ1 reliable?
The price and inventory of REF3033AIDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3033AIDBZRQ1 is usually 5 days.
3.What payment methods are accepted for REF3033AIDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3033AIDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3033AIDBZRQ1?
REF3033AIDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3033AIDBZRQ1 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 REF3033AIDBZRQ1?
For technical support, including REF3033AIDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3033AIDBZRQ1 requirements.
6.How does Aetrix verify that REF3033AIDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All REF3033AIDBZRQ1 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 REF3033AIDBZRQ1 meets industry standards.
7.What is the process for return or replacement of REF3033AIDBZRQ1?
All REF3033AIDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with REF3033AIDBZRQ1, 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 REF3033AIDBZRQ1 part is unused and in its original packaging.
Return procedure for REF3033AIDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
REF3033AIDBZRQ1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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