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Texas Instruments REF2933AIDBZT
- Part No.:
- REF2933AIDBZT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
REF2933AIDBZT.pdf
- Description:
- IC VREF SERIES 2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
REF2933AIDBZT from Texas Instruments is a precision 3.3 V CMOS 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, and ultra-low 50 µA quiescent current. It operates with only 1 mV dropout under no load and supports up to 25 mA output current - ideal for high-accuracy ADC biasing in portable instrumentation.
For engineers reviewing the REF2933AIDBZT datasheet, REF2933AIDBZT pinout, REF2933AIDBZT application, or REF2933AIDBZT equivalent, key selection criteria include low-drift stability over –40°C to 125°C, load regulation of ≤100 µV/mA, noise performance of 36 µVPP (0.1–10 Hz), and compatibility with capacitive loads without external compensation.
Technical Context
The REF2933AIDBZT implements a curvature-compensated band-gap topology with dual NPN transistors (Q1/Q2) and resistor R1 to generate a temperature-invariant 3.3 V output. Its CMOS architecture enables rail-to-rail operation down to 1 mV above VOUT, eliminating need for external load capacitance while maintaining stability across all capacitive loads.
Thermal hysteresis is specified at ≤100 ppm after cycling from –40°C to 125°C and return to 25°C. Long-term stability is characterized at 24 ppm (0–1000 hrs) and 15 ppm (1000–2000 hrs), supporting high-reliability data acquisition systems requiring multi-year calibration integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V nominal; 3.234–3.366 V (±0.7%) over –40°C to 125°C - ensures consistent ADC full-scale reference across industrial temperature range |
| Temperature Drift | Max 100 ppm/°C - limits output error to ±330 µV over 100°C span, critical for 16-bit+ converter accuracy |
| Quiescent Current | Max 50 µA at 25°C; 59 µA over full temperature range - enables >10-year battery life in always-on sensor nodes |
| Dropout Voltage | 1 mV (unloaded); ≤50 mV at 25 mA - allows operation from 3.35 V supply in low-voltage systems with minimal headroom |
| Noise (0.1–10 Hz) | 36 µVPP - contributes <0.06 LSB error to 16-bit 3.3 V ADC, avoiding need for external filtering |
| Load Regulation | ≤100 µV/mA - maintains reference stability despite dynamic current draw from successive-approximation ADC sampling |
| ESD Rating | ±4000 V HBM - supports robust handling during PCB assembly and field service without additional protection |
Pinout & Package
SOT-23 (DBZ) package: 2.92 mm × 1.30 mm body size, 3-pin surface-mount configuration with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 3.35–5.5 V input; must be bypassed with ≥0.47 µF ceramic capacitor to suppress supply noise coupling into reference output |
| 2 (OUT) | Precision reference output | Delivers stable 3.3 V; directly connects to ADC VREF, DAC reference, or comparator threshold without series resistance |
| 3 (GND) | Analog ground reference | Must connect to clean analog ground plane; separate from digital ground to prevent noise injection into reference node |
Key Features
| Feature | Design Value |
|---|---|
| No external capacitor required | Stable with any capacitive load (including 0 µF), simplifying layout and reducing BOM count in space-constrained designs |
| Ultra-low dropout | Operates within 1 mV of output voltage when unloaded - enables use in 3.3 V systems with tight supply margins |
| High output current | 25 mA continuous drive capability - sufficient to power multiple op-amps, ADCs, or small logic circuits from single reference |
| Low temperature drift | 100 ppm/°C max over –40°C to 125°C - meets industrial-grade accuracy requirements without external calibration |
| Low quiescent current | 50 µA max - extends battery life in portable medical devices and handheld test equipment beyond 5 years |
Applications
| Portable Medical Sensors | Data Acquisition Modules |
|---|---|
Use Scenario: Battery-powered ECG front-end amplifying microvolt-level cardiac signals with 24-bit ΣΔ ADC digitization. IC Role / Device Role / Timing Role: Provides 3.3 V reference for ADC and signal-chain biasing, ensuring consistent gain and offset calibration across temperature. Use Value: 100 ppm/°C drift limits measurement error to <0.01% FS over patient body temperature range (35–42°C), meeting IEC 60601 clinical accuracy requirements. |
Use Scenario: Industrial PLC analog input card acquiring 8-channel 16-bit voltage/current measurements in factory automation. IC Role / Device Role / Timing Role: Supplies common reference to multiplexed SAR ADC and programmable gain amplifier, enabling channel-to-channel matching. Use Value: 36 µVPP low-frequency noise prevents dither-induced quantization errors, preserving effective resolution in noisy plant-floor environments. |
| Handheld Test Equipment | Battery Management Systems |
Use Scenario: Pocket-sized multimeter measuring DC voltage with auto-ranging and 4½-digit display. IC Role / Device Role / Timing Role: Reference source for internal 200 mV and 2 V ranges, scaled via precision resistors. Use Value: ±0.7% initial accuracy eliminates need for user calibration; 24 ppm long-term stability maintains accuracy over 2-year service intervals. |
Use Scenario: EV battery pack monitor IC measuring cell voltages with 1 mV resolution across 96-series Li-ion cells. IC Role / Device Role / Timing Role: High-stability reference for 16-bit ADC monitoring individual cell voltages under thermal stress. Use Value: 50 µA quiescent current minimizes parasitic drain on standby battery; 125°C rating supports operation near hot battery modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3433ARJZ-R7 | Higher initial accuracy (±0.1%), but 95 µA IQ and 125 ppm/°C drift; requires 1 µF output capacitor | Better for metrology-grade instruments needing <0.01% total error; unsuitable for ultra-low-power designs | Select REF2933AIDBZT when battery life or capacitor-free operation is prioritized over sub-0.1% accuracy |
| LM4040C33IDCKR | Shunt topology; 3.3 V, ±0.5% accuracy, 70 ppm/°C, 60 µA IQ; requires external cathode resistor | Lower cost for fixed-current applications; less efficient at high load currents due to constant shunt dissipation | Choose REF2933AIDBZT for series-regulated operation with variable load current up to 25 mA and no minimum load requirement |
Compared with ADR3433ARJZ-R7 and LM4040C33IDCKR, REF2933AIDBZT uniquely balances ultra-low IQ (50 µA), capacitor-free stability, and industrial temperature range - making it optimal for portable, battery-critical systems where layout simplicity and long service life outweigh marginal accuracy gains.
Availability
REF2933AIDBZT is available at Aetrix Electronics and suitable for portable medical sensors, data acquisition modules, handheld test equipment, battery management systems, and industrial control systems requiring stable component supply with guaranteed long-term continuity.
Supply support for REF2933AIDBZT 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 and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.
The REF29xx family was engineered specifically for portable and battery-powered instrumentation requiring ultra-low power, high accuracy, and wide-temperature stability - targeting applications where traditional references compromise on size, efficiency, or thermal performance.
FAQ
What is the maximum load current supported by the REF2933AIDBZT?
The REF2933AIDBZT delivers up to 25 mA of continuous output current while maintaining specified accuracy and regulation. At this load, dropout voltage remains ≤50 mV, and load regulation is bounded at ≤100 µV/mA - ensuring stable 3.3 V output even under dynamic current demands from ADCs or op-amps. Exceeding 25 mA may cause thermal derating or output deviation beyond datasheet limits.
Does the REF2933AIDBZT require an output capacitor for stability?
No, the REF2933AIDBZT is internally compensated and stable with any capacitive load - including zero capacitance. Unlike many references, it does not require an external output capacitor for phase margin or transient response. However, TI recommends a 0.47 µF ceramic bypass capacitor on the IN pin to suppress supply noise that could modulate the reference output.
What is the operating temperature range of the REF2933AIDBZT?
The REF2933AIDBZT is fully specified from –40°C to +125°C ambient temperature. All key parameters - including output voltage accuracy (±0.7%), temperature drift (≤100 ppm/°C), quiescent current (≤59 µA), and load regulation - are guaranteed across this extended industrial range, making it suitable for automotive under-hood, industrial motor control, and outdoor instrumentation applications.
How does the REF2933AIDBZT achieve low dropout voltage?
The REF2933AIDBZT uses a CMOS-based series pass element with optimized gate drive, enabling operation with only 1 mV headroom between input and output under no-load conditions. This ultra-low dropout is achieved through proprietary process tuning and feedback loop design - allowing direct use from 3.35 V supplies in 3.3 V systems without intermediate regulators or LDOs.
Can the REF2933AIDBZT be used in negative reference configurations?
By itself, the REF2933AIDBZT is a positive-output reference and cannot sink current to generate negative voltages. However, it can be combined with an op-amp such as the OPA703 to create a precision bipolar reference - for example, using REF2933AIDBZT to set +3.3 V and the op-amp to invert and buffer –3.3 V. This configuration is documented in TI's REF29xx datasheet Figure 27 for split-supply data acquisition systems.
REF2933AIDBZT 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
REF2933AIDBZT FAQ
1.How can I place an order for REF2933AIDBZT through Aetrix?
Please submit a Request for Quotation (RFQ) for REF2933AIDBZT 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 REF2933AIDBZT reliable?
The price and inventory of REF2933AIDBZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF2933AIDBZT is usually 5 days.
3.What payment methods are accepted for REF2933AIDBZT?
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4.How is shipping managed for REF2933AIDBZT?
REF2933AIDBZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF2933AIDBZT 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 REF2933AIDBZT?
For technical support, including REF2933AIDBZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF2933AIDBZT requirements.
6.How does Aetrix verify that REF2933AIDBZT is sourced from the original manufacturer or authorized distributors?
All REF2933AIDBZT 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 REF2933AIDBZT meets industry standards.
7.What is the process for return or replacement of REF2933AIDBZT?
All REF2933AIDBZT units undergo pre-shipment inspection (PSI). If there is an issue with REF2933AIDBZT, 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 REF2933AIDBZT part is unused and in its original packaging.
Return procedure for REF2933AIDBZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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