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Texas Instruments REF3233AIDBVR
- Part No.:
- REF3233AIDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF3233AIDBVR.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,879
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Product details
Overview
REF3233AIDBVR from Texas Instruments is a precision 3.3V bandgap voltage reference IC with 4ppm/°C max drift (0°C to +125°C), ±10mA output current, 0.01% initial accuracy, and 110μA quiescent current - designed for high-stability analog signal chains in portable data acquisition and medical instrumentation.
For engineers reviewing the REF3233AIDBVR datasheet, REF3233AIDBVR pinout, REF3233AIDBVR application, or REF3233AIDBVR equivalent, this page delivers verified specifications, SOT23-6 terminal mapping, real-world use cases, and validated alternative options for low-drift, micropower reference design.
Technical Context
The REF3233AIDBVR implements a CMOS-based bandgap core with force-sense architecture (OUT_F/OUT_S and GND_F/GND_S) to reject trace resistance effects and maintain 3.3V accuracy under load. Its low-dropout operation (5mV min) enables use with supply rails as low as 3.305V at no load.
It features digital enable control (ENABLE pin), shutdown current <1μA, thermal hysteresis ≤100ppm, and stability with any capacitive load - all specified across –40°C to +125°C without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V nominal, ±7mV (3.293–3.307V) at +25°C - ensures ADC full-scale alignment within 0.2% error margin. |
| Temp Drift (0°C to +125°C) | 4ppm/°C typical, 7ppm/°C max - contributes ≤0.88mV total drift over range, critical for 16-bit+ systems. |
| Initial Accuracy | ±0.01% (±330μV) - supports calibration-free designs in portable test equipment. |
| Quiescent Current | 110μA typical, 130μA max - enables >1-year battery life in 10μA sleep-mode IoT sensors. |
| Dropout Voltage | 5mV min (unloaded), 50mV max - allows direct regulation from 3.3V LDOs or Li-ion cells down to 3.305V. |
| Output Current | ±10mA - drives 10kΩ loads or multiple SAR ADC references without buffering. |
| Long-Term Stability | 55ppm (0–1000h) - guarantees <0.18mV output shift over first 42 days of operation. |
Pinout & Package
SOT23-6 (DBV) package: 2.9mm × 2.8mm footprint, surface-mount, RoHS-compliant, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND_F | Analog ground reference | Primary ground return for internal bandgap and buffer - must connect to low-impedance system ground plane. |
| 2: GND_S | Remote sense ground | ESD-diode-connected internal ground; differential voltage vs GND_F must stay <200mV to avoid conduction. |
| 3: ENABLE | Digital enable input | Active-high logic: ≥1.5V enables reference; <0.7V places device in shutdown (<1μA IQ). |
| 4: IN | Positive supply input | Accepts 3.305V–5.5V; dropout as low as 5mV enables ultra-low headroom operation. |
| 5: OUT_S | Remote sense output | Connects directly to load ground to compensate for PCB trace resistance in precision applications. |
| 6: OUT_F | Main reference output | Delivers regulated 3.3V; force-sense architecture maintains accuracy even with 100mΩ trace resistance. |
Key Features
| Feature | Design Value |
|---|---|
| Force-sense output architecture | Compensates for up to 100mΩ PCB trace resistance between reference and load, preserving 0.01% accuracy. |
| Ultra-low dropout voltage | 5mV minimum enables operation from 3.305V supplies - ideal for single-cell Li-ion or low-headroom LDO systems. |
| Stable with any capacitive load | No external capacitor required; eliminates risk of oscillation with ADC decoupling caps (0.1–10μF). |
| Wide temperature specification | –40°C to +125°C operating range qualified for automotive cabin and industrial motor-control environments. |
| Low thermal hysteresis | ≤100ppm first-cycle hysteresis ensures repeatable voltage after thermal cycling in field-deployed test gear. |
Applications
| Portable Data Acquisition | Medical Vital Signs Monitoring |
|---|---|
|
Use Scenario: Handheld multimeter or battery-powered oscilloscope front-end digitizing analog signals. IC Role / Device Role / Timing Role: Primary 3.3V reference for 16-bit SAR ADCs and analog front-ends. Use Value: 4ppm/°C drift and 0.01% accuracy maintain measurement integrity across ambient temperature swings during field use. |
Use Scenario: ECG/EEG patient monitor acquiring microvolt-level biopotentials with high common-mode rejection. IC Role / Device Role / Timing Role: Stable excitation and reference source for instrumentation amplifiers and delta-sigma ADCs. Use Value: Force-sense outputs eliminate trace-resistance errors in compact PCB layouts, ensuring diagnostic-grade accuracy. |
| Industrial Test Equipment | Automotive Sensor Signal Conditioning |
|
Use Scenario: Benchtop power supply or calibrator requiring traceable 3.3V reference for DAC feedback loops. IC Role / Device Role / Timing Role: Precision voltage source for closed-loop regulation and metrology-grade calibration. Use Value: 55ppm long-term stability over 1000h reduces recalibration frequency in production test fixtures. |
Use Scenario: Engine control unit (ECU) sensing throttle position or exhaust gas oxygen via ratiometric sensors. IC Role / Device Role / Timing Role: Ratiometric reference for sensor excitation and ADC conversion in harsh under-hood environments. Use Value: Specified operation to +125°C and 20ppm/°C max drift (–40°C to +125°C) ensures consistent A/D linearity across thermal transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3433ARJZ-R7 | 3.3V, 10ppm/°C max drift (–40°C to +125°C), 120μA IQ, SOT23-5 (no sense pins) | Lacks force-sense architecture; requires careful layout to mitigate trace resistance errors. | Choose when board space is constrained and trace resistance <20mΩ; verify load regulation impact. |
| MAX6126AASA33+ | 3.3V, 3ppm/°C max drift (0°C to +70°C), 150μA IQ, SO-8 package | Higher accuracy in commercial temp range but larger footprint and no enable/shutdown function. | Prefer for lab-grade instruments where ultimate drift performance matters more than size or power. |
Compared with REF3233AIDBVR, ADR3433ARJZ-R7 trades force-sense capability for smaller size and lower cost, while MAX6126AASA33+ offers superior drift in limited temperature ranges at the expense of disable functionality and board area.
Availability
REF3233AIDBVR is available at Aetrix Electronics and suitable for portable instrumentation, medical diagnostics, and industrial test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for REF3233AIDBVR 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 analog ICs and voltage references.
The REF32xx family was engineered specifically for battery-powered and space-constrained applications demanding micropower operation, low drift, and force-sense accuracy - targeting portable test gear, medical sensors, and industrial DAQ systems.
FAQ
What is the minimum supply voltage required for stable operation of the REF3233AIDBVR?
The REF3233AIDBVR operates with a minimum supply voltage of 3.305V (VOUT + 5mV) under no-load conditions. With load, dropout increases to ≤50mV - meaning VIN ≥ 3.35V is recommended for ±10mA sourcing. This ultra-low dropout enables direct use with 3.3V LDOs or partially discharged Li-ion cells.
How does the force-sense architecture of the REF3233AIDBVR improve accuracy in real PCB layouts?
The REF3233AIDBVR uses separate OUT_F/OUT_S and GND_F/GND_S terminals to actively compensate for voltage drop across PCB traces. By routing OUT_S and GND_S directly to the load, the device adjusts its output to maintain 3.3V at the point of use - eliminating errors from trace resistance up to ~100mΩ, which is critical in compact medical sensor modules.
Can the REF3233AIDBVR be used without an output capacitor?
Yes - the REF3233AIDBVR is internally compensated and stable with any capacitive load, including zero capacitance. Unlike many references, it requires no minimum output capacitor, simplifying layout and avoiding potential instability with large ADC decoupling caps (e.g., 10μF ceramics).
What is the maximum allowable differential voltage between GND_S and GND_F on the REF3233AIDBVR?
The REF3233AIDBVR specifies a maximum differential voltage of 200mV between GND_S and GND_F. Exceeding this risks forward-biasing internal ESD protection diodes, causing leakage or regulation errors. Maintain tight ground routing or use Kelvin connections to ensure compliance.
Does the REF3233AIDBVR support shutdown mode, and what is its quiescent current in that state?
Yes - driving the ENABLE pin below 0.7V places the REF3233AIDBVR in shutdown mode, reducing quiescent current to 0.1–1μA. This feature extends battery life in intermittent-measurement devices like portable DMMs or wireless sensor nodes, with fast 60μs wake-up settling to 0.1%.
REF3233AIDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SOT-23-6
- 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:
- 10 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 43µVp-p
- Noise - 10Hz to 10kHz:
- 63µVrms
- Voltage - Input:
- 3.35V ~ 5.5V
- Current - Supply:
- 135µA
- Current - Cathode:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
REF3233AIDBVR FAQ
1.How can I place an order for REF3233AIDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3233AIDBVR 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 REF3233AIDBVR reliable?
The price and inventory of REF3233AIDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3233AIDBVR is usually 5 days.
3.What payment methods are accepted for REF3233AIDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3233AIDBVR transactions.
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4.How is shipping managed for REF3233AIDBVR?
REF3233AIDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3233AIDBVR 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 REF3233AIDBVR?
For technical support, including REF3233AIDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3233AIDBVR requirements.
6.How does Aetrix verify that REF3233AIDBVR is sourced from the original manufacturer or authorized distributors?
All REF3233AIDBVR 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 REF3233AIDBVR meets industry standards.
7.What is the process for return or replacement of REF3233AIDBVR?
All REF3233AIDBVR units undergo pre-shipment inspection (PSI). If there is an issue with REF3233AIDBVR, 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 REF3233AIDBVR part is unused and in its original packaging.
Return procedure for REF3233AIDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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