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Texas Instruments REF3212AIDBVR
- Part No.:
- REF3212AIDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SOT-23-6
- Datasheet:
-
REF3212AIDBVR.pdf
- Description:
- IC VREF SERIES 0.2% SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:804
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Product details
Overview
REF3212AIDBVR from Texas Instruments is a precision 1.25V bandgap voltage reference IC with 0.01% initial accuracy, 4ppm/°C drift (0°C to +125°C), and ±10mA output current capability in SOT23-6 package. It delivers low dropout (5mV), ultra-low quiescent current (110μA), and force-sense output architecture for high-accuracy data acquisition systems requiring stable excitation or ADC reference under varying load conditions.
For engineers reviewing the REF3212AIDBVR datasheet, REF3212AIDBVR pinout, REF3212AIDBVR application, or REF3212AIDBVR equivalent, this page provides verified technical context, validated pin functions, real-world use cases in portable instrumentation and medical sensing, and confirmed alternative options for precision voltage reference selection.
Technical Context
The REF3212AIDBVR implements a CMOS-based bandgap core with buffered force-sense output topology, enabling accurate regulation at the load by compensating for trace resistance via separate OUT_F/OUT_S and GND_F/GND_S terminals. Its enable-controlled shutdown mode draws only 0.1–1μA, supporting battery-powered operation.
It operates down to 1.8V supply (5mV above 1.25V output), achieves 17µVPP (0.1–10Hz) noise, and maintains stability with any capacitive load - no external compensation required. Thermal hysteresis is specified at 100ppm (first cycle) and 25ppm (subsequent cycles).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.25V ±0.0025V (±0.2%) - tight tolerance enables direct interface with 12-bit+ SAR ADCs without calibration. |
| Initial Accuracy | 0.01% - ensures ≤125µV absolute error at room temperature for high-fidelity sensor excitation. |
| Temp Drift (0°C to +125°C) | 4ppm/°C typ. (7ppm/°C max) - contributes ≤0.875mV total drift over full range, critical for uncalibrated field instruments. |
| Quiescent Current | 110μA typ. (130μA max) - supports >1-year battery life in 10μA-average-power portable devices. |
| Dropout Voltage | 5mV min. - allows operation from 1.255V supply, enabling use with single-cell LiFePO₄ or boosted coin cells. |
| Output Current | ±10mA - drives 100Ω loads directly or supplies multiple op-amps and ADC references without buffering. |
| Long-Term Stability | 55ppm (0–1000h) - predictable aging behavior supports 10-year medical device reliability requirements. |
Pinout & Package
SOT23-6 (DBV) package: 2.9mm × 2.8mm footprint with gull-wing leads; RoHS-compliant, NIPDAU finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: GND_F | Analog ground reference | Return path for internal bandgap core; connects to system power ground plane for noise immunity. |
| 2: GND_S | Remote sense ground | Connects to load ground point to cancel voltage drop in PCB traces - must stay within ±200mV of GND_F. |
| 3: ENABLE | Digital control input | Active-high logic: ≥1.5V enables reference; ≤0.7V disables output and reduces current to <1μA. |
| 4: IN | Positive supply input | Accepts 1.8V to 5.5V; minimum headroom is 5mV above VOUT for regulation. |
| 5: OUT_S | Remote sense output | Feedback node tied to load-side reference point; enables Kelvin sensing for <0.01% load regulation. |
| 6: OUT_F | Main output driver | High-current buffer delivering regulated 1.25V; sinks/sources ±10mA with <40µV/mA load regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Force-sense output architecture | Eliminates trace resistance error: OUT_F/OUT_S and GND_F/GND_S pins enable true Kelvin connection at remote load. |
| Ultra-low dropout | 5mV minimum - permits operation from 1.255V supply, ideal for energy-harvesting and single-cell battery systems. |
| Low-noise performance | 17µVPP (0.1–10Hz) - minimizes quantization uncertainty in high-resolution delta-sigma ADC applications. |
| Enable-controlled shutdown | Reduces supply current to 0.1–1μA - extends battery life in intermittent-sampling portable equipment. |
| Capacitive-load stability | No external capacitor required - simplifies layout and eliminates risk of oscillation with ceramic decoupling. |
Applications
| Portable Medical Sensors | Data Acquisition Modules |
|---|---|
|
Use Scenario: Battery-powered handheld ECG monitor with 16-bit ADC sampling at 1kSPS. IC Role / Device Role / Timing Role: Provides stable 1.25V reference for ADC and analog front-end biasing. Use Value: 4ppm/°C drift and 17µVPP noise ensure <0.005% measurement linearity across clinical operating temperatures. |
Use Scenario: Industrial PLC analog input card measuring 4–20mA loop signals with cold-junction compensation. IC Role / Device Role / Timing Role: Supplies precision excitation voltage to RTD bridges and reference to 24-bit ΣΔ ADC. Use Value: Force-sense architecture maintains <0.01% accuracy despite 100mΩ PCB trace resistance between reference and ADC. |
| Handheld Test Equipment | Battery-Operated IoT Nodes |
|
Use Scenario: Pocket-sized multimeter with auto-ranging and true-RMS conversion. IC Role / Device Role / Timing Role: Serves as primary voltage reference for dual-slope integrator and digital calibration engine. Use Value: 0.01% initial accuracy and 55ppm long-term stability eliminate need for field recalibration over 2-year service intervals. |
Use Scenario: Wireless environmental sensor node powered by CR2032 coin cell, transmitting temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Powers low-power MCU ADC and analog sensor conditioning circuitry during active measurement phase. Use Value: 110μA quiescent current and enable-controlled shutdown extend battery life to >3 years at 1% duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADR3412ARJZ-R7 | 1.2V output, 10ppm/°C drift (−40°C to +125°C), 3.5μA quiescent current, SOT23-5 package (no sense pins) | Lacks force-sense architecture; suitable for low-power, non-Kelvin applications where trace resistance <10mΩ | Choose when board space is constrained and load regulation error <0.05% is acceptable. |
| MAX6126AASA+T | 1.25V output, 3ppm/°C drift (0°C to +70°C), 1.1mA quiescent current, SO-8 package, no enable pin | Higher power, wider package, fixed-on operation - better for mains-powered lab equipment than portable designs | Prefer for metrology-grade bench instruments where ultra-low drift outweighs power and size constraints. |
Compared with REF3212AIDBVR, ADR3412ARJZ-R7 trades force-sense accuracy for lower quiescent current and smaller footprint, while MAX6126AASA+T offers superior drift performance at the cost of 10× higher supply current and no shutdown capability - making REF3212AIDBVR optimal for portable, battery-sensitive, high-accuracy applications requiring Kelvin sensing.
Availability
REF3212AIDBVR is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition modules, and handheld test equipment requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for REF3212AIDBVR 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 signal chains and power management ICs.
The REF32xx family was designed specifically for high-accuracy, low-power, force-sense voltage reference applications in portable instrumentation, medical diagnostics, and industrial process control systems where trace resistance and thermal drift directly impact measurement integrity.
FAQ
What is the minimum supply voltage required for stable operation of REF3212AIDBVR?
The REF3212AIDBVR requires a minimum supply voltage of 1.8V - 5mV above its 1.25V output - to maintain regulation under no-load conditions. At full ±10mA load, dropout increases to 50mV maximum, so VIN ≥ 1.30V is required. This ultra-low headroom enables compatibility with single-cell LiFePO₄ batteries and low-voltage boost converters in the REF3212AIDBVR design.
How does the force-sense architecture of REF3212AIDBVR improve accuracy in real PCB layouts?
The REF3212AIDBVR uses separate OUT_F/OUT_S and GND_F/GND_S pins to implement Kelvin sensing: OUT_S and GND_S connect directly at the load, allowing the internal amplifier to regulate voltage precisely at that point. This cancels voltage drop across PCB traces and connectors - eliminating up to 50mV of error from 50mΩ resistance at 1A, a critical advantage in REF3212AIDBVR-based data acquisition systems.
Can REF3212AIDBVR drive a 100Ω load directly without external buffering?
Yes. The REF3212AIDBVR delivers ±10mA output current with <40µV/mA sourcing and <60µV/mA sinking load regulation - meaning it maintains 1.25V ±0.4mV accuracy into a 100Ω load (12.5mA max). Its 5mV dropout and rail-to-rail capability allow direct driving of op-amp bias networks, ADC references, and sensor excitation circuits without added components in the REF3212AIDBVR application.
What is the noise performance of REF3212AIDBVR, and how does it affect high-resolution ADCs?
The REF3212AIDBVR exhibits 17µVPP (0.1–10Hz) and 24µVRMS (10Hz–10kHz) output voltage noise. For a 16-bit 1.25V full-scale ADC, this contributes <0.3 LSB peak-to-peak noise - well below the 19.5µV LSB step, preserving effective resolution. Low-frequency noise is especially critical for delta-sigma converters, where REF3212AIDBVR's bandgap design minimizes 1/f contribution.
Does REF3212AIDBVR require an output capacitor for stability?
No. The REF3212AIDBVR is internally compensated and remains stable with any capacitive load - including zero capacitance - per TI's characterization. Unlike many references, it does not require a minimum output capacitor, simplifying layout and avoiding potential resonance issues with ceramic decoupling. This robustness is explicitly validated across all operating conditions in the REF3212AIDBVR datasheet.
REF3212AIDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SOT-23-6
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Series
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±0.2%
- Temperature Coefficient:
- 20ppm/°C
- Noise - 0.1Hz to 10Hz:
- 17µVp-p
- Noise - 10Hz to 10kHz:
- 24µVrms
- Voltage - Input:
- 1.8V ~ 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
REF3212AIDBVR FAQ
1.How can I place an order for REF3212AIDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for REF3212AIDBVR 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 REF3212AIDBVR reliable?
The price and inventory of REF3212AIDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REF3212AIDBVR is usually 5 days.
3.What payment methods are accepted for REF3212AIDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REF3212AIDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REF3212AIDBVR?
REF3212AIDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REF3212AIDBVR 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 REF3212AIDBVR?
For technical support, including REF3212AIDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REF3212AIDBVR requirements.
6.How does Aetrix verify that REF3212AIDBVR is sourced from the original manufacturer or authorized distributors?
All REF3212AIDBVR 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 REF3212AIDBVR meets industry standards.
7.What is the process for return or replacement of REF3212AIDBVR?
All REF3212AIDBVR units undergo pre-shipment inspection (PSI). If there is an issue with REF3212AIDBVR, 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 REF3212AIDBVR part is unused and in its original packaging.
Return procedure for REF3212AIDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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